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Copyright (C) 1991, 1992 Ian Lance Taylor This file is part of the Taylor UUCP package. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. The author of the program may be contacted at ian@@airs.com or c/o AIRS, P.O. Box 520, Waltham, MA 02254. $Log: sys2.unx,v $ Revision 1.72 1992/04/03 17:43:39 ian Petri Helenius: don't clobber undefined bits in termio or termios Revision 1.71 1992/04/01 21:52:04 ian T. William Wells: handle a system without or Revision 1.70 1992/03/30 15:29:58 ian Added HAVE_SVR4_LOCKFILES Revision 1.69 1992/03/29 22:25:27 ian Always block and unblock read and write descriptors together Revision 1.68 1992/03/28 04:12:17 ian Gerben Wierda: minor cleanups Revision 1.67 1992/03/28 03:06:04 ian Don't use TIOCEXCL locking Revision 1.66 1992/03/28 02:47:30 ian Rework HAVE_UNBLOCKED_WRITES to work even if writes are unblocked Revision 1.65 1992/03/17 15:35:28 ian Log signals when they happen, even if we continue looping Revision 1.64 1992/03/17 05:01:33 ian Don't block when opening the write descriptor Revision 1.63 1992/03/17 01:03:03 ian Miscellaneous cleanup Revision 1.62 1992/03/16 01:23:08 ian Make blocking writes optional Revision 1.61 1992/03/15 07:15:42 ian T. William Wells: don't use unblocked writes Revision 1.60 1992/03/15 04:51:17 ian Keep an array of signals we've received rather than a single variable Revision 1.59 1992/03/15 01:54:46 ian All execs are now done in isspawn, all waits are done in iswait Revision 1.58 1992/03/12 21:50:50 ian Moved local header includes above sleep routine determination Revision 1.57 1992/03/12 19:54:43 ian Debugging based on types rather than number Revision 1.56 1992/03/11 02:09:57 ian Franc,ois Pinard: retry fork several times before giving up Revision 1.55 1992/03/09 22:11:46 ian Franc,ois Pinard: sleep for a second after closing a serial port Revision 1.54 1992/03/09 22:07:36 ian Wait for terminal output to drain at various points Revision 1.53 1992/03/08 16:56:51 ian Ted Lindgreen: if CRTSCTS is defined, don't turn on IXOFF Revision 1.52 1992/03/08 04:56:21 ian Peter da Silva: added ``lockname'' command for ports Revision 1.51 1992/03/08 01:56:01 ian Include if we have it Revision 1.50 1992/03/08 01:37:45 ian Suppurt TIOCEXCL locking Revision 1.49 1992/03/07 16:25:21 ian Preserve unknown bits in c_cflag Revision 1.48 1992/03/04 23:43:39 ian Petri Helenius: didn't remove lock file if open failed Revision 1.47 1992/03/04 01:40:51 ian Thomas Fischer: tweaked a bit for the NeXT Revision 1.46 1992/03/03 21:01:20 ian Use strict timeout in fsserial_read, eliminate all race conditions Revision 1.45 1992/03/03 04:25:00 ian T. William Wells: don't arbitrarily extend read timeout Revision 1.44 1992/03/02 04:53:07 ian Marc Unangst: added HAVE_SCO_LOCKFILES configuration parameter Revision 1.43 1992/02/28 05:06:15 ian T. William Wells: fsysdep_catch must be a macro Revision 1.42 1992/02/27 05:40:54 ian T. William Wells: detach from controlling terminal, handle signals safely Revision 1.41 1992/02/24 21:22:47 ian The poll function takes milliseconds, not microseconds (my error) Revision 1.40 1992/02/24 21:18:17 ian Roberto Biancardi: use poll for sleeping if we haven't got anything else Revision 1.39 1992/02/24 20:07:43 ian John Theus: some systems don't have Revision 1.38 1992/02/23 03:26:51 ian Overhaul to use automatic configure shell script Revision 1.37 1992/02/17 22:08:50 ian Bob Denny: log chat script messages as LOG_NORMAL, not LOG_ERROR Revision 1.36 1992/02/08 20:02:36 ian Added HAVE_SETRET configuration option for systems without setjmp Revision 1.35 1992/02/08 03:54:18 ian Include only in , added 1992 copyright Revision 1.34 1992/01/16 16:32:44 ian Mike Park: ioctl is sometimes declared varadic, so we can't declare it Revision 1.33 1992/01/15 21:06:11 ian Mike Park: some systems can't include and together Revision 1.32 1992/01/15 20:40:04 ian Mike Park: some systems don't have Revision 1.31 1992/01/15 19:40:35 ian Mike Park: handle HAVE_UNION_WAIT correctly and completely Revision 1.30 1992/01/14 04:18:47 ian Chip Salzenberg: added HAVE_USLEEP configuration parameter Revision 1.29 1992/01/13 06:11:39 ian David Nugent: can't declare open or fcntl Revision 1.28 1991/12/31 04:16:19 ian Chip Salzenberg: don't turn on IXON and IXOFF at the start Revision 1.27 1991/12/29 04:04:18 ian Added a bunch of extern definitions Revision 1.26 1991/12/29 00:55:23 ian Monty Solomon: added HAVE_UNION_WAIT Revision 1.25 1991/12/22 22:14:19 ian Monty Solomon: added HAVE_UNISTD_H configuration parameter Revision 1.24 1991/12/20 02:23:10 ian Don't change port settings if we don't have to Revision 1.23 1991/12/19 04:25:57 ian Terry Gardner: configuration parameter to not use both NONBLOCK and NDELAY Revision 1.22 1991/12/17 23:14:08 ian T. William Wells: allow dialer complete and abort to be chat scripts Revision 1.21 1991/12/17 22:31:15 ian Start in RAW mode, to avoid dropping characters when we switch to it Revision 1.20 1991/12/17 05:24:01 ian David Nugent: flush pending input in fsserial_open Revision 1.19 1991/12/15 04:28:23 ian Don't turn on ISTRIP initially Revision 1.18 1991/12/10 19:45:05 ian Added ulog_device to record device name for log file Revision 1.17 1991/12/01 02:23:12 ian Niels Baggesen: don't multiply include Revision 1.16 1991/11/26 01:50:30 ian Set fread_blocking and fwrite_blocking correctly for TCP routines Revision 1.15 1991/11/26 01:45:42 ian Marty Shannon: configuration option to not include Revision 1.14 1991/11/22 06:05:57 ian Gregory Gulik: fix wait status macro definitions Revision 1.13 1991/11/21 20:58:18 ian Brian Campbell: for HAVE_SIGSETJMP use sigjmp_buf, not jmp_buf Revision 1.12 1991/11/15 23:13:53 ian Fixed termio(s) version of fsserial_set Revision 1.11 1991/11/13 20:38:00 ian Added TCP port type for connections over TCP Revision 1.10 1991/11/12 19:07:27 ian Be careful to only call fsetterminfo on a terminal Revision 1.9 1991/11/11 23:47:24 ian Added chat-program to run a program to do a chat script Revision 1.8 1991/11/11 00:39:45 ian Open port in seven bit mode, added fport_set to change to eight bit Revision 1.7 1991/11/08 22:52:34 ian Brian Campbell: only include and when needed Revision 1.6 1991/11/08 22:11:45 ian Brian Campbell: allow sigsetjmp as configuration option Revision 1.5 1991/11/07 22:52:11 ian Chip Salzenberg: force stdin and stdout to stay open in case of spawning Revision 1.4 1991/11/07 21:43:59 ian Chip Salzenberg: set terminal modes directly, don't or them in Revision 1.3 1991/11/07 19:42:16 ian Chip Salzenberg: declare inline functions consistently Revision 1.2 1991/11/07 19:32:28 ian Chip Salzenberg: allow LOCKDIR, and check that locking process exists Revision 1.1 1991/09/10 19:45:50 ian Initial revision */ #include "uucp.h" #if USE_RCS_ID char sys2_unx_rcsid[] = "$Id: sys2.unx,v 1.72 1992/04/03 17:43:39 ian Rel $"; #endif #include #if HAVE_LIMITS_H #include #endif #if USE_STDIO && HAVE_UNISTD_H #include #endif #include "system.h" #include "sysdep.h" #include "port.h" /* Pick a timing routine to use. I somewhat arbitrarily picked usleep above nap above napms above poll above select. */ #if HAVE_USLEEP || HAVE_NAP || HAVE_NAPMS || HAVE_POLL #define USE_SELECT_TIMER 0 #else #define USE_SELECT_TIMER HAVE_SELECT #endif #if HAVE_USLEEP || HAVE_NAP || HAVE_NAPMS #undef HAVE_POLL #define HAVE_POLL 0 #endif #if HAVE_USLEEP || HAVE_NAP #undef HAVE_NAPMS #define HAVE_NAPMS 0 #endif #if HAVE_USLEEP #undef HAVE_NAP #define HAVE_NAP 0 #endif #if HAVE_FCNTL_H #include #else #if HAVE_SYS_FILE_H #include #endif #endif #ifndef O_RDONLY #define O_RDONLY 0 #define O_WRONLY 1 #define O_RDWR 2 #endif #if HAVE_SYS_IOCTL_H #include #endif #if USE_SELECT_TIMER || HAVE_BSD_TTY #include #endif #if HAVE_POLL #if HAVE_STROPTS_H #include #endif #if HAVE_POLL_H #include #endif #if ! HAVE_STROPTS_H && ! HAVE_POLL_H /* We need a definition for struct pollfd, although it doesn't matter what it contains. It's used in usysdep_pause. */ struct pollfd { int idummy; }; #endif /* ! HAVE_STROPTS_H && ! HAVE_POLL_H */ #endif /* HAVE_POLL */ #if HAVE_TIME_H #if HAVE_SYS_TIME_AND_TIME_H || (! USE_SELECT_TIMER && ! HAVE_BSD_TTY) #include #endif #endif /* Get definitions for both O_NONBLOCK and O_NDELAY. */ #ifndef O_NDELAY #ifdef FNDELAY #define O_NDELAY FNDELAY #else /* ! defined (FNDELAY) */ #define O_NDELAY 0 #endif /* ! defined (FNDELAY) */ #endif /* ! defined (O_NDELAY) */ #ifndef O_NONBLOCK #ifdef FNBLOCK #define O_NONBLOCK FNBLOCK #else /* ! defined (FNBLOCK) */ #define O_NONBLOCK 0 #endif /* ! defined (FNBLOCK) */ #endif /* ! defined (O_NONBLOCK) */ #if O_NDELAY == 0 && O_NONBLOCK == 0 #error No way to do nonblocking I/O #endif /* If we can define them both together, do so. This is because some ancient drivers on some systems appear to look for one but not the other. Otherwise just use O_NONBLOCK. */ #if COMBINED_UNBLOCK #define FILE_UNBLOCKED (O_NDELAY | O_NONBLOCK) #else #define FILE_UNBLOCKED O_NONBLOCK #endif /* Get definitions for both EAGAIN and EWOULDBLOCK. */ #ifndef EAGAIN #ifndef EWOULDBLOCK #define EAGAIN (-1) #define EWOULDBLOCK (-1) #else /* defined (EWOULDBLOCK) */ #define EAGAIN EWOULDBLOCK #endif /* defined (EWOULDBLOCK) */ #else /* defined (EAGAIN) */ #ifndef EWOULDBLOCK #define EWOULDBLOCK EAGAIN #endif /* ! defined (EWOULDBLOCK) */ #endif /* defined (EAGAIN) */ /* Make sure we have a definition for MAX_INPUT. */ #ifndef MAX_INPUT #define MAX_INPUT (256) #endif /* Make sure we have definitions for major and minor. */ #ifndef major #define major(i) (((i) >> 8) & 0xff) #endif #ifndef minor #define minor(i) ((i) & 0xff) #endif /* If we have the TIOCSINUSE ioctl call, we use it to lock a terminal. Otherwise, if we have the TIOCEXCL ioctl call, we have to open the terminal before we know that it is unlocked. */ #ifdef TIOCSINUSE #define HAVE_TIOCSINUSE 1 #else #ifdef TIOCEXCL #define HAVE_TIOCEXCL 1 #endif #endif /* Determine bits to clear for the various terminal control fields for HAVE_SYSV_TERMIO and HAVE_POSIX_TERMIOS. */ #if HAVE_SYSV_TERMIO #define ICLEAR_IFLAG (IGNBRK | BRKINT | IGNPAR | PARMRK | INPCK \ | ISTRIP | INLCR | IGNCR | ICRNL | IUCLC \ | IXON | IXANY | IXOFF) #define ICLEAR_OFLAG (OPOST | OLCUC | ONLCR | OCRNL | ONOCR | ONLRET \ | OFILL | OFDEL | NLDLY | CRDLY | TABDLY | BSDLY \ | VTDLY | FFDLY) #define ICLEAR_CFLAG (CBAUD | CLOCAL | CSIZE | PARENB | PARODD) #define ISET_CFLAG (CS8 | CREAD | HUPCL) #define ICLEAR_LFLAG (ISIG | ICANON | XCASE | ECHO | ECHOE | ECHOK \ | ECHONL | NOFLSH) #endif #if HAVE_POSIX_TERMIOS #define ICLEAR_IFLAG (BRKINT | ICRNL | IGNBRK | IGNCR | IGNPAR \ | INLCR | INPCK | ISTRIP | IXOFF | IXON \ | PARMRK) #define ICLEAR_OFLAG (OPOST) #define ICLEAR_CFLAG (CLOCAL | CSIZE | PARENB | PARODD) #define ISET_CFLAG (CS8 | CREAD | HUPCL) #define ICLEAR_LFLAG (ECHO | ECHOE | ECHOK | ECHONL | ICANON | IEXTEN \ | ISIG | NOFLSH | TOSTOP) #endif /* External functions. */ extern char *strlwr (); extern int close (), pipe (), dup2 (), read (), write (); extern int fclose (); extern void _exit (); #if USE_SELECT_TIMER || HAVE_BSD_TTY extern int select (); #endif #if HAVE_NAP extern int nap (); #endif #if HAVE_NAPMS extern int napms (); #endif #if HAVE_POLL extern int poll (); #endif /* Local functions. */ static SIGtype usalarm P((int isig)); static boolean fsserial_lockfile P((boolean flok, const struct sport *, const char *zdevice)); static boolean fsserial_lock P((const struct sport *qport, struct ssysdep_serial_port *q, boolean fin, const char *zdevice)); static boolean fsserial_open P((const char *z, long ibaud, boolean fwait, struct ssysdep_serial_port *q)); __inline__ static boolean fsblock P((struct ssysdep_serial_port *q, boolean fblock)); static boolean fsserial_close P((struct ssysdep_serial_port *q)); static boolean fsserial_reset P((struct ssysdep_serial_port *q)); static boolean fsserial_read P((struct ssysdep_serial_port *q, char *zbuf, int *pclen, int cmin, int ctimeout, boolean freport, boolean fpty)); static boolean fsserial_write P((struct ssysdep_serial_port *q, const char *zwrite, int cwrite)); static boolean fsserial_io P((struct ssysdep_serial_port *q, const char *zwrite, int *pcwrite, char *zread, int *pcread)); static boolean fsserial_break P((struct ssysdep_serial_port *q)); static boolean fsserial_set P((struct ssysdep_serial_port *q, enum tportsetting tset)); static boolean fsrun_chat P((int oread, int owrite, const char *zprog)); /* This code handles SIGALRM. See the discussion above fsserial_read. Normally we ignore SIGALRM, but the handler will temporarily be set to this function, which should set fSalarm and then either longjmp or schedule another SIGALRM. fSalarm is never referred to outside of this file, but we don't make it static to try to fool compilers which don't understand volatile. */ volatile sig_atomic_t fSalarm; static SIGtype usalarm (isig) int isig; { #if ! HAVE_SIGACTION && ! HAVE_SIGVEC && ! HAVE_SIGSET (void) signal (isig, usalarm); #endif fSalarm = TRUE; #if HAVE_RESTARTABLE_SYSCALLS longjmp (sSjmp_buf, 1); #else alarm (1); #endif } /* We need a simple routine to block SIGINT, SIGQUIT, SIGTERM and SIGPIPE and another to restore the original state. When these functions are called (in fsysdep_modem_close) SIGHUP is being ignored. The routines are isblocksigs, which returns a value of type HELD_SIG_MASK and usunblocksigs which takes a single argument of type HELD_SIG_MASK. */ #if HAVE_SIGPROCMASK /* Use the POSIX sigprocmask call. */ extern int sigprocmask (); #define HELD_SIG_MASK sigset_t static sigset_t isblocksigs P((void)); static sigset_t isblocksigs () { sigset_t sblock, sold; sigemptyset (&sblock); sigaddset (&sblock, SIGINT); sigaddset (&sblock, SIGQUIT); sigaddset (&sblock, SIGTERM); sigaddset (&sblock, SIGPIPE); sigprocmask (SIG_BLOCK, &sblock, &sold); return sold; } #define usunblocksigs(s) \ ((void) sigprocmask (SIG_SETMASK, &(s), (sigset_t *) NULL)) #else /* ! HAVE_SIGPROCMASK */ #if HAVE_SIGBLOCK /* Use the BSD sigblock and sigsetmask calls. */ extern int sigblock (), sigsetmask (); #define HELD_SIG_MASK int #ifndef sigmask #define sigmask(i) (1 << ((i) - 1)) #endif #define isblocksigs() \ sigblock (sigmask (SIGINT) | sigmask (SIGQUIT) \ | sigmask (SIGTERM) | sigmask (SIGPIPE)) #define usunblocksigs(i) ((void) sigsetmask (i)) #else /* ! HAVE_SIGBLOCK */ #if HAVE_SIGHOLD /* Use the SVR3 sighold and sigrelse calls. */ extern int sighold (), sigrelse (); #define HELD_SIG_MASK int static int isblocksigs P((void)); static int isblocksigs () { sighold (SIGINT); sighold (SIGQUIT); sighold (SIGTERM); sighold (SIGPIPE); return 0; } static void usunblocksigs P((int)); /*ARGSUSED*/ static void usunblocksigs (i) int i; { sigrelse (SIGINT); sigrelse (SIGQUIT); sigrelse (SIGTERM); sigrelse (SIGPIPE); } #else /* ! HAVE_SIGHOLD */ /* We have no way to block signals. This system will suffer from a race condition in fsysdep_modem_close. */ #define HELD_SIG_MASK int #define isblocksigs() 0 #define usunblocksigs(i) #endif /* ! HAVE_SIGHOLD */ #endif /* ! HAVE_SIGBLOCK */ #endif /* ! HAVE_SIGPROCMASK */ /* Pause for half a second. This doesn't really belong in this file, but all the timing routines are here. */ void usysdep_pause () { #if HAVE_NAPMS napms (500); #endif /* HAVE_NAPMS */ #if HAVE_NAP nap (500L); #endif /* HAVE_NAP */ #if HAVE_USLEEP usleep (500 * (long) 1000); #endif /* HAVE_USLEEP */ #if HAVE_POLL struct pollfd sdummy; /* We need to pass an unused pollfd structure because poll checks the address before checking the number of elements. */ poll (&sdummy, 0, 500); #endif /* HAVE_POLL */ #if USE_SELECT_TIMER struct timeval s; s.tv_sec = 0; s.tv_usec = 500 * (long) 1000; select (0, (int *) NULL, (int *) NULL, (int *) NULL, &s); #endif /* USE_SELECT_TIMER */ #if ! HAVE_NAPMS && ! HAVE_NAP && ! HAVE_USLEEP #if ! USE_SELECT_TIMER && ! HAVE_POLL sleep (1); #endif /* ! USE_SELECT_TIMER && ! HAVE_POLL */ #endif /* ! HAVE_NAPMS && ! HAVE_NAP && ! HAVE_USLEEP */ } /* This routine is used for both locking and unlocking. It is the only routine which knows how to translate a device name into the name of a lock file. If it can't figure out a name, it does nothing and returns TRUE. */ static boolean fsserial_lockfile (flok, qport, zdevice) boolean flok; const struct sport *qport; const char *zdevice; { const char *z; z = qport->zlockname; if (z == NULL) { char *zalc; z = zdevice; if (z == NULL) { z = qport->zname; if (z == NULL) return TRUE; } #if ! HAVE_SVR4_LOCKFILES if (strncmp (z, "/dev/", sizeof "/dev/" - 1) == 0) z += sizeof "/dev/" - 1; zalc = (char *) alloca (strlen (z) + sizeof "LCK.."); sprintf (zalc, "LCK..%s", z); #if HAVE_SCO_LOCKFILES strlwr (zalc + sizeof "LCK.." - 1); #endif #else /* HAVE_SVR4_LOCKFILES */ { struct stat s; if (*z != '/') { zalc = (char *) alloca (sizeof "/dev/" + strlen (z)); sprintf (zalc, "/dev/%s", z); z = zalc; } if (stat (z, &s) != 0) { ulog (LOG_ERROR, "stat (%s): %s", z, strerror (errno)); return FALSE; } zalc = (char *) alloca (sizeof "LK.123.123.123"); sprintf (zalc, "LK.%03d.%03d.%03d", major (s.st_dev), major (s.st_rdev), minor (s.st_rdev)); } #endif /* HAVE_SVR4_LOCKFILES */ z = zalc; } if (flok) return fsdo_lock (z, FALSE); else return fsdo_unlock (z, FALSE); } /* If we can mark a modem line in use, then when we lock a port we must open it and mark it in use. We can't wait until the actual open because we can't fail out if it is locked then. */ static boolean fsserial_lock (qport, q, fin, zdevice) const struct sport *qport; struct ssysdep_serial_port *q; boolean fin; const char *zdevice; { if (! fsserial_lockfile (TRUE, qport, zdevice)) return FALSE; #if HAVE_TIOCSINUSE || HAVE_TIOCEXCL /* Open the line and, if possible, mark it in use. */ { const char *z; int oread, iflag; z = zdevice; if (z == NULL) { z = qport->zname; if (z == NULL) return TRUE; } if (fin) iflag = 0; else iflag = FILE_UNBLOCKED; if (*z != '/') { char *zcopy; zcopy = (char *) alloca (sizeof "/dev/" + strlen (z)); sprintf (zcopy, "/dev/%s", z); z = zcopy; } oread = open (z, O_RDWR | iflag); if (oread < 0) { if (errno != EBUSY) ulog (LOG_ERROR, "open (%s): %s", z, strerror (errno)); (void) fsserial_lockfile (FALSE, qport, zdevice); return FALSE; } #if HAVE_TIOCSINUSE /* If we can't mark it in use, return FALSE to indicate that the lock failed. */ if (ioctl (oread, TIOCSINUSE, 0) < 0) { if (errno != EALREADY) ulog (LOG_ERROR, "ioctl (TIOCSINUSE): %s", strerror (errno)); (void) close (oread); (void) fsserial_lockfile (FALSE, qport, zdevice); return FALSE; } #endif #ifdef TIOCSCTTY /* On BSD 4.4, make it our controlling terminal. */ (void) ioctl (oread, TIOCSCTTY, 0); #endif q->oread = q->owrite = oread; } #endif /* HAVE_TIOCSINUSE || HAVE_TIOCEXCL */ return TRUE; } /* We don't need to lock a stdin port. */ /*ARGSUSED*/ boolean fsysdep_stdin_lock (qport, fin) struct sport *qport; boolean fin; { return TRUE; } /* Lock a modem port. */ boolean fsysdep_modem_lock (qport, fin) struct sport *qport; boolean fin; { return fsserial_lock (qport, &qport->u.smodem.s.s, fin, qport->u.smodem.zdevice); } /* Lock a direct port. */ boolean fsysdep_direct_lock (qport, fin) struct sport *qport; boolean fin; { return fsserial_lock (qport, &qport->u.sdirect.s.s, fin, qport->u.sdirect.zdevice); } /* Open a serial line. This sets the terminal settings. We begin in seven bit mode and let the protocol change if necessary. */ static struct sbaud_table { #if HAVE_POSIX_TERMIOS speed_t icode; #else int icode; #endif long ibaud; } asSbaud_table[] = { { B50, 50 }, { B75, 75 }, { B110, 110 }, { B134, 134 }, { B150, 150 }, { B200, 200 }, { B300, 300 }, { B600, 600 }, { B1200, 1200 }, { B1800, 1800 }, { B2400, 2400 }, { B4800, 4800 }, { B9600, 9600 }, #ifdef B19200 { B19200, 19200 }, #else /* ! defined (B19200) */ #ifdef EXTA { EXTA, 19200 }, #endif /* EXTA */ #endif /* ! defined (B19200) */ #ifdef B38400 { B38400, 38400 } #else /* ! defined (B38400) */ #ifdef EXTB { EXTB, 38400 } #endif /* EXTB */ #endif /* ! defined (B38400) */ }; #define CBAUD_TABLE (sizeof asSbaud_table / sizeof asSbaud_table[0]) #if HAVE_SYSV_TERMIO || HAVE_POSIX_TERMIOS /* Hold the MIN value for the terminal to avoid setting it unnecessarily. */ static int cSmin; #endif /* HAVE_SYSV_TERMIO || HAVE_POSIX_TERMIOS */ static boolean fsserial_open (z, ibaud, fwait, q) const char *z; long ibaud; boolean fwait; struct ssysdep_serial_port *q; { #if HAVE_POSIX_TERMIOS speed_t ib; #else int ib; #endif if (z == NULL) { const char *zport; boolean fdummy; zport = zsysdep_port_name (&fdummy); if (zport != NULL) ulog_device (zport); } else { if (strncmp (z, "/dev/", sizeof "/dev/" - 1) == 0) ulog_device (z + sizeof "/dev/" - 1); else ulog_device (z); } ib = B0; if (ibaud != 0) { int i; for (i = 0; i < CBAUD_TABLE; i++) if (asSbaud_table[i].ibaud == ibaud) break; if (i >= CBAUD_TABLE) { ulog (LOG_ERROR, "Unsupported baud rate %ld", ibaud); if (q->oread != -1) { (void) close (q->oread); if (q->oread != q->owrite) (void) close (q->owrite); } return FALSE; } ib = asSbaud_table[i].icode; } /* The port may have already been opened by the locking routine. */ if (q->oread == -1) { int oread, owrite; if (z == NULL) { oread = 0; owrite = 1; } else { int iflag; if (fwait) iflag = 0; else iflag = FILE_UNBLOCKED; if (*z != '/') { char *zcopy; zcopy = (char *) alloca (sizeof "/dev/" + strlen (z)); sprintf (zcopy, "/dev/%s", z); z = zcopy; } oread = open (z, O_RDWR | iflag); if (oread < 0) { ulog (LOG_ERROR, "open (%s): %s", z, strerror (errno)); return FALSE; } #ifdef TIOCSCTTY /* On BSD 4.4, make it our controlling terminal. */ (void) ioctl (oread, TIOCSCTTY, 0); #endif owrite = oread; } q->oread = oread; q->owrite = owrite; } /* Make sure the ports are blocking. */ if (fcntl (q->oread, F_SETFL, 0) < 0 || (q->oread != q->owrite && fcntl (q->owrite, F_SETFL, 0) < 0)) { ulog (LOG_ERROR, "fcntl: %s", strerror (errno)); (void) close (q->oread); if (q->oread != q->owrite) (void) close (q->owrite); return FALSE; } q->fread_blocking = TRUE; if (! fgetterminfo (q->oread, &q->sorig)) { q->fterminal = FALSE; return TRUE; } q->fterminal = TRUE; q->snew = q->sorig; #if HAVE_BSD_TTY q->snew.sg_flags = RAW | ANYP; if (ibaud == 0) ib = q->snew.sg_ospeed; else { q->snew.sg_ispeed = ib; q->snew.sg_ospeed = ib; } #ifdef TIOCHPCL /* When the file is closed, hang up the line. This is a safety measure in case the program crashes. */ (void) ioctl (q->oread, TIOCHPCL, 0); #endif #ifdef TIOCFLUSH { int iparam; /* Flush pending input. */ #ifdef FREAD iparam = FREAD; #else iparam = 0; #endif (void) ioctl (q->oread, TIOCFLUSH, &iparam); } #endif /* TIOCFLUSH */ #endif /* HAVE_BSD_TTY */ #if HAVE_SYSV_TERMIO if (ibaud == 0) ib = q->snew.c_cflag & CBAUD; q->snew.c_iflag &=~ ICLEAR_IFLAG; q->snew.c_oflag &=~ ICLEAR_OFLAG; q->snew.c_cflag &=~ ICLEAR_CFLAG; q->snew.c_cflag |= (ib | ISET_CFLAG); q->snew.c_lflag &=~ ICLEAR_LFLAG; cSmin = 6; q->snew.c_cc[VMIN] = cSmin; q->snew.c_cc[VTIME] = 0; #ifdef TCFLSH /* Flush pending input. */ (void) ioctl (q->oread, TCFLSH, 0); #endif #endif /* HAVE_SYSV_TERMIO */ #if HAVE_POSIX_TERMIOS if (ibaud == 0) ib = cfgetospeed (&q->snew); q->snew.c_iflag &=~ ICLEAR_IFLAG; q->snew.c_oflag &=~ ICLEAR_OFLAG; q->snew.c_cflag &=~ ICLEAR_CFLAG; q->snew.c_cflag |= ISET_CFLAG; q->snew.c_lflag &=~ ICLEAR_LFLAG; cSmin = 6; q->snew.c_cc[VMIN] = cSmin; q->snew.c_cc[VTIME] = 0; (void) cfsetospeed (&q->snew, ib); (void) cfsetispeed (&q->snew, ib); /* Flush pending input. */ (void) tcflush (q->oread, TCIFLUSH); #endif /* HAVE_POSIX_TERMIOS */ if (! fsetterminfo (q->oread, &q->snew)) { ulog (LOG_ERROR, "Can't set terminal settings: %s", strerror (errno)); (void) close (q->oread); if (q->oread != q->owrite) (void) close (q->owrite); return FALSE; } if (ibaud != 0) q->ibaud = ibaud; else { int i; q->ibaud = 1200; for (i = 0; i < CBAUD_TABLE; i++) { if (asSbaud_table[i].icode == ib) { q->ibaud = asSbaud_table[i].ibaud; break; } } DEBUG_MESSAGE1 (DEBUG_PORT, "fsserial_open: Baud rate is %ld", q->ibaud); } return TRUE; } /* Open a stdin port. */ boolean fsysdep_stdin_open (qport, ibaud, fwait) struct sport *qport; long ibaud; boolean fwait; { return fsserial_open ((const char *) NULL, ibaud, fwait, &qport->u.sstdin.s.s); } /* Open a modem port. */ boolean fsysdep_modem_open (qport, ibaud, fwait) struct sport *qport; long ibaud; boolean fwait; { const char *z; boolean fret; z = qport->u.smodem.zdevice; if (z == NULL) { z = qport->zname; if (z == NULL) { ulog (LOG_ERROR, "Port has no name or device"); return FALSE; } } if (ibaud == 0) ibaud = qport->u.smodem.ibaud; fret = fsserial_open (z, ibaud, fwait, &qport->u.smodem.s.s); if (! fret) (void) fsserial_lockfile (FALSE, qport, qport->u.smodem.zdevice); return fret; } /* Open a direct port. */ boolean fsysdep_direct_open (qport, ibaud, fwait) struct sport *qport; long ibaud; boolean fwait; { const char *z; boolean fret; z = qport->u.sdirect.zdevice; if (z == NULL) { z = qport->zname; if (z == NULL) { ulog (LOG_ERROR, "Port has no name or device"); return FALSE; } } if (ibaud == 0) ibaud = qport->u.sdirect.ibaud; fret = fsserial_open (z, ibaud, fwait, &qport->u.sdirect.s.s); if (! fret) (void) fsserial_lockfile (FALSE, qport, qport->u.sdirect.zdevice); return fret; } /* Change the blocking status of the port. We keep track of the current blocking status to avoid calling fcntl unnecessarily; fcntl turns out to be surprisingly expensive, at least on Ultrix. We used to keep track of the blocking status of the read port and the write port independently. Unfortunately, this is nonportable, because on BSD, and probably some other systems, unblocking a terminal applies to all descriptors to that terminal. Now, if oread != owrite, we set both. */ __inline__ static boolean fsblock (qs, fblock) struct ssysdep_serial_port *qs; boolean fblock; { if (fblock ? ! qs->fread_blocking : qs->fread_blocking) { int iset; if (fblock) iset = 0; else iset = FILE_UNBLOCKED; if (fcntl (qs->oread, F_SETFL, iset) < 0 || (qs->oread != qs->owrite && fcntl (qs->owrite, F_SETFL, iset) < 0)) { ulog (LOG_ERROR, "fcntl: %s", strerror (errno)); return FALSE; } qs->fread_blocking = fblock; } return TRUE; } /* Close a serial port. */ static boolean fsserial_close (q) struct ssysdep_serial_port *q; { if (q->oread >= 0) { /* Use a 30 second timeout to avoid hanging while draining output. */ if (q->fterminal) { fSalarm = FALSE; if (fsysdep_catch ()) { usysdep_start_catch (); usset_signal (SIGALRM, usalarm, TRUE, (boolean *) NULL); (void) alarm (30); (void) fsetterminfodrain (q->oread, &q->sorig); } usset_signal (SIGALRM, SIG_IGN, TRUE, (boolean *) NULL); (void) alarm (0); usysdep_end_catch (); /* If we timed out, use the non draining call. Hopefully this can't hang. */ if (fSalarm) (void) fsetterminfo (q->oread, &q->sorig); } (void) close (q->oread); if (q->oread != q->owrite) (void) close (q->owrite); q->oread = q->owrite = -1; /* Sleep for a second to give the terminal a chance to settle, in case we are about to call out again. */ sleep (1); } return TRUE; } /* Close a stdin port. */ /*ARGSUSED*/ boolean fsysdep_stdin_close (qport, fsuccess) struct sport *qport; boolean fsuccess; { return fsserial_close (&qport->u.sstdin.s.s); } /* Close a modem port. */ boolean fsysdep_modem_close (qport, fsuccess) struct sport *qport; boolean fsuccess; { boolean fret; struct sdialer *qdial; struct sdialer sdial; fret = TRUE; qdial = NULL; /* We're no longer interested in carrier. */ (void) fsysdep_modem_no_carrier (qport); if (qport->u.smodem.zdialer != NULL) { char *zcopy; zcopy = (char *) alloca (strlen (qport->u.smodem.zdialer) + 1); strcpy (zcopy, qport->u.smodem.zdialer); zcopy[strcspn (zcopy, " \t")] = '\0'; if (! fread_dialer_info (zcopy, &sdial)) fret = FALSE; else qdial = &sdial; } else qdial = qport->u.smodem.qdialer; if (qdial != NULL) { boolean fsighup_ignored; HELD_SIG_MASK smask; int i; sig_atomic_t afhold[INDEXSIG_COUNT]; const struct schat_info *qchat; /* The port I/O routines check whether any signal has been received, and abort if one has. While we are closing down the modem, we don't care if we received a signal in the past, but we do care if we receive a new signal (otherwise it would be difficult to kill a uucico which was closing down a modem). We never care if we get SIGHUP at this point. So we turn off SIGHUP, remember what signals we've already seen, and clear our notion of what signals we've seen. We have to block the signals while we remember and clear the array, since we might otherwise miss a signal which occurred between the copy and the clear (old systems can't block signals; they will just have to suffer the race). */ usset_signal (SIGHUP, SIG_IGN, FALSE, &fsighup_ignored); smask = isblocksigs (); for (i = 0; i < INDEXSIG_COUNT; i++) { afhold[i] = afSignal[i]; afSignal[i] = FALSE; } usunblocksigs (smask); if (fsuccess) qchat = &qdial->scomplete; else qchat = &qdial->sabort; if (! fchat (qchat, (const struct ssysteminfo *) NULL, (const struct sdialer *) NULL, (const char *) NULL, FALSE, qport->zname, qport->u.smodem.s.s.ibaud)) fret = FALSE; /* Restore the old signal array and the SIGHUP handler. It is not necessary to block signals here, since all we are doing is exactly what the signal handler itself would do if the signal occurred. */ for (i = 0; i < INDEXSIG_COUNT; i++) if (afhold[i]) afSignal[i] = TRUE; if (! fsighup_ignored) usset_signal (SIGHUP, ussignal, TRUE, (boolean *) NULL); } if (! fsserial_close (&qport->u.smodem.s.s)) fret = FALSE; if (! fsserial_lockfile (FALSE, qport, qport->u.smodem.zdevice)) fret = FALSE; return fret; } /* Close a direct port. */ /*ARGSUSED*/ boolean fsysdep_direct_close (qport, fsuccess) struct sport *qport; boolean fsuccess; { boolean fret; fret = fsserial_close (&qport->u.sdirect.s.s); if (! fsserial_lockfile (FALSE, qport, qport->u.sdirect.zdevice)) fret = FALSE; return fret; } /* Reset a serial port by hanging up. */ #if ! HAVE_POSIX_TERMIOS static boolean fsserial_reset (q) struct ssysdep_serial_port *q; { sterminal sbaud; if (! q->fterminal) return TRUE; sbaud = q->snew; #if HAVE_BSD_TTY sbaud.sg_ispeed = B0; sbaud.sg_ospeed = B0; #else /* ! HAVE_BSD_TTY */ sbaud.c_cflag = (sbaud.c_cflag &~ CBAUD) | B0; #endif /* ! HAVE_BSD_TTY */ if (! fsetterminfodrain (q->oread, &sbaud)) ulog (LOG_FATAL, "Can't hangup terminal: %s", strerror (errno)); /* Give the terminal a chance to settle. */ sleep (1); if (! fsetterminfo (q->oread, &q->snew)) ulog (LOG_FATAL, "Can't reopen terminal: %s", strerror (errno)); return TRUE; } #else /* HAVE_POSIX_TERMIOS */ static boolean fsserial_reset (q) struct ssysdep_serial_port *q; { sterminal sbaud; speed_t iin, iout; if (! q->fterminal) return TRUE; iin = cfgetispeed (&q->snew); iout = cfgetospeed (&q->snew); sbaud = q->snew; if (cfsetospeed (&sbaud, B0) != 0 || ! fsetterminfodrain (q->oread, &sbaud)) ulog (LOG_FATAL, "Can't hangup terminal: %s", strerror (errno)); /* Give the terminal a chance to settle. */ sleep (1); if (cfsetispeed (&q->snew, iin) != 0 || cfsetospeed (&q->snew, iout) != 0 || ! fsetterminfo (q->oread, &q->snew)) ulog (LOG_FATAL, "Can't reopen terminal: %s", strerror (errno)); return TRUE; } #endif /* HAVE_POSIX_TERMIOS */ /* Reset a stdin port. */ boolean fsysdep_stdin_reset (qport) struct sport *qport; { return fsserial_reset (&qport->u.sstdin.s.s); } /* Reset a modem port. */ boolean fsysdep_modem_reset (qport) struct sport *qport; { return fsserial_reset (&qport->u.smodem.s.s); } /* Reset a direct port. */ boolean fsysdep_direct_reset (qport) struct sport *qport; { return fsserial_reset (&qport->u.sdirect.s.s); } /* Begin dialing out on a modem port. This opens the dialer device if there is one. */ boolean fsysdep_modem_begin_dial (qport, qdial) struct sport *qport; struct sdialer *qdial; { #ifdef TIOCMODEM /* If we can tell the modem to obey modem control, do so. */ { int iperm; iperm = 0; (void) ioctl (qport->u.smodem.s.s.oread, TIOCMODEM, &iperm); } #endif /* TIOCMODEM */ #ifdef TIOCCDTR /* If we supposed to toggle DTR, do so. */ if (qdial->fdtr_toggle) { (void) ioctl (qport->u.smodem.s.s.oread, TIOCCDTR, 0); (void) ioctl (qport->u.smodem.s.s.oread, TIOCSDTR, 0); if (qdial->fdtr_toggle_wait) sleep (1); } #endif /* TIOCCDTR */ if (! fsysdep_modem_no_carrier (qport)) return FALSE; /* Open the dial device if there is one. */ if (qport->u.smodem.zdial_device != NULL) { const char *z; int oread; qport->u.smodem.s.s.oholdread = qport->u.smodem.s.s.oread; qport->u.smodem.s.s.oholdwrite = qport->u.smodem.s.s.owrite; z = qport->u.smodem.zdial_device; if (*z != '/') { char *zcopy; zcopy = (char *) alloca (sizeof "/dev/" + strlen (z)); sprintf (zcopy, "/dev/%s", z); z = zcopy; } oread = open (z, O_RDWR); if (oread < 0) { ulog (LOG_ERROR, "open (%s): %s", z, strerror (errno)); return FALSE; } qport->u.smodem.s.s.oread = qport->u.smodem.s.s.owrite = oread; } return TRUE; } /* Tell the port to not require carrier. I don't know how to do this on a BSD system that doesn't support TIOCNCAR, if there are any such systems. */ boolean fsysdep_modem_no_carrier (qport) struct sport *qport; { if (! qport->u.smodem.s.s.fterminal) return TRUE; #ifdef TIOCNCAR /* Tell the modem to ignore carrier. */ if (ioctl (qport->u.smodem.s.s.oread, TIOCNCAR, 0) < 0) { ulog (LOG_ERROR, "ioctl (TIOCNCAR): %s", strerror (errno)); return FALSE; } #endif /* TIOCNCAR */ #if HAVE_SYSV_TERMIO || HAVE_POSIX_TERMIOS /* Put the modem into local mode (ignore carrier) to start the chat script. */ qport->u.smodem.s.s.snew.c_cflag |= CLOCAL; if (! fsetterminfo (qport->u.smodem.s.s.oread, &qport->u.smodem.s.s.snew)) { ulog (LOG_ERROR, "Can't set CLOCAL: %s", strerror (errno)); return FALSE; } #endif /* HAVE_SYSV_TERMIO || HAVE_POSIX_TERMIOS */ return TRUE; } /* Tell the port to require carrier. If the port does not support carrier, we do nothing. We do not need to worry whether the dialer supports carrier, since this will only be called when explicitly requested by a dialer chat script. */ boolean fsysdep_modem_need_carrier (qport) struct sport *qport; { if (! qport->u.smodem.s.s.fterminal) return TRUE; if (qport->u.smodem.fcarrier) { #ifdef TIOCCAR /* Tell the modem to pay attention to carrier. */ if (ioctl (qport->u.smodem.s.s.oread, TIOCCAR, 0) < 0) { ulog (LOG_ERROR, "ioctl (TIOCCAR): %s", strerror (errno)); return FALSE; } #endif /* TIOCCAR */ #if HAVE_SYSV_TERMIO || HAVE_POSIX_TERMIOS /* Put the modem into nonlocal mode. */ qport->u.smodem.s.s.snew.c_cflag &=~ CLOCAL; if (! fsetterminfo (qport->u.smodem.s.s.oread, &qport->u.smodem.s.s.snew)) { ulog (LOG_ERROR, "Can't clear CLOCAL: %s", strerror (errno)); return FALSE; } #endif /* HAVE_SYSV_TERMIO || HAVE_POSIX_TERMIOS */ } return TRUE; } /* Finish dialing out on a modem by closing any dialer device and waiting for carrier. */ boolean fsysdep_modem_end_dial (qport, qdial) struct sport *qport; struct sdialer *qdial; { if (qport->u.smodem.zdial_device != NULL) { (void) close (qport->u.smodem.s.s.oread); qport->u.smodem.s.s.oread = qport->u.smodem.s.s.oholdread; qport->u.smodem.s.s.owrite = qport->u.smodem.s.s.oholdwrite; } if (qport->u.smodem.fcarrier && qdial->fcarrier) { /* Tell the port that we need carrier. */ if (! fsysdep_modem_need_carrier (qport)) return FALSE; #ifdef TIOCWONLINE /* We know how to wait for carrier, so do so. */ /* If we already got a signal, just quit now. */ if (FGOT_QUIT_SIGNAL ()) return FALSE; /* This bit of code handles signals just like fsserial_read does. See that function for a longer explanation. */ /* Use fsysdep_catch to handle a longjmp from the signal handler. */ fSalarm = FALSE; if (fsysdep_catch ()) { /* Start catching SIGALRM; normally we ignore it. */ usysdep_start_catch (); usset_signal (SIGALRM, usalarm, TRUE, (boolean *) NULL); (void) alarm (qdial->ccarrier_wait); /* We really don't care if we get an error, since that will probably just mean that TIOCWONLINE isn't supported in which case there's nothing we can do anyhow. If we get SIGINT we want to keep waiting for carrier, because SIGINT just means don't start any new sessions. We don't handle SIGINT correctly if we do a longjmp in the signal handler; too bad. */ while (ioctl (qport->u.smodem.s.s.oread, TIOCWONLINE, 0) < 0 && errno == EINTR) { /* Log the signal. */ ulog (LOG_ERROR, (const char *) NULL); if (FGOT_QUIT_SIGNAL () || fSalarm) break; } } /* Turn off the pending SIGALRM and ignore SIGALARM again. */ usset_signal (SIGALRM, SIG_IGN, TRUE, (boolean *) NULL); (void) alarm (0); usysdep_end_catch (); /* If we got a random signal, just return FALSE. */ if (FGOT_QUIT_SIGNAL ()) return FALSE; /* If we timed out, give an error. */ if (fSalarm) { ulog (LOG_ERROR, "Timed out waiting for carrier"); return FALSE; } #endif /* TIOCWONLINE */ } return TRUE; } /* Read data from a serial port, with a timeout. This function should return when we have read cmin characters or the timeout has occurred. We have to work a bit to get UNIX to do this efficiently. The simple implementation schedules a SIGALRM signal and then calls read; if there is a single character available, the call to read will return immediately, so there must be a loop which terminates when the SIGALRM is delivered or the correct number of characters has been read. This can be very inefficient with a fast CPU or a low baud rate (or both!), since each call to read may return only one or two characters. Under POSIX or System V, we can specify a minimum number of characters to read, so there is no serious trouble. Under BSD, we figure out how many characters we have left to read, how long it will take for them to arrive at the current baud rate, and sleep that long. Doing this with a timeout and avoiding all possible race conditions get very hairy, though. Basically, we're going to schedule a SIGALRM for when the timeout expires. I don't really want to do a longjmp in the SIGALRM handler, though, because that may lose data. Therefore, I have the signal handler set a variable. However, this means that there will be a span of time between the time the code checks the variable and the time it calls the read system call; if the SIGALRM occurs during that time, the read might hang forever. To avoid this, the SIGALRM handler not only sets a global variable, it also schedules another SIGALRM for one second in the future (POSIX specifies that a signal handler is permitted to safely call alarm). To avoid getting a continual sequence of SIGALRM interrupts, we change the signal handler to ignore SIGALRM when we're about to exit the function. This means that every time we execute fsserial_read we make at least five system calls. It's the best I've been able to come up with, though. When fsserial_read finishes, there will be no SIGALRM scheduled and SIGALRM will be ignored. */ static boolean fsserial_read (q, zbuf, pclen, cmin, ctimeout, freport, fpty) struct ssysdep_serial_port *q; char *zbuf; int *pclen; int cmin; int ctimeout; boolean freport; boolean fpty; { CATCH_PROTECT int cwant; boolean fret; cwant = *pclen; *pclen = 0; /* Guard against a bad timeout. We return TRUE when a timeout expires. It is possible to get a negative timeout here because the calling code does not check user supplied timeouts for plausibility. */ if (ctimeout <= 0) return TRUE; /* We want to do a blocking read. */ if (! fsblock (q, TRUE)) return FALSE; fSalarm = FALSE; /* We're going to set up an alarm signal to last for the entire read. If the read system call cannot be interrupted, the signal handler will do a longjmp causing fsysdep_catch (a macro) to return FALSE. We handle that here. If read can be interrupted, fsysdep_catch will be defined to TRUE. */ if (fsysdep_catch ()) { /* Prepare to catch SIGALRM and schedule the signal. */ usysdep_start_catch (); usset_signal (SIGALRM, usalarm, TRUE, (boolean *) NULL); alarm (ctimeout); } else { /* We caught a signal. We don't actually have to do anything, as all the appropriate checks are made at the start of the following loop. */ } fret = FALSE; while (TRUE) { int cgot; #if HAVE_SYSV_TERMIO || HAVE_POSIX_TERMIOS /* If we can tell the terminal not to return until we have a certain number of characters, do so. */ if (q->fterminal) { int csetmin; /* I'm not that confident about setting MIN to values larger than 127, although up to 255 would probably work. */ if (cmin < 127) csetmin = cmin; else csetmin = 127; if (csetmin != cSmin) { q->snew.c_cc[VMIN] = csetmin; if (! fsetterminfo (q->oread, &q->snew)) { int ierr; /* We turn off the signal before reporting the error to minimize any problems with interrupted system calls. */ ierr = errno; usset_signal (SIGALRM, SIG_IGN, TRUE, (boolean *) NULL); alarm (0); usysdep_end_catch (); ulog (LOG_ERROR, "Can't set MIN for terminal: %s", strerror (ierr)); return FALSE; } cSmin = csetmin; } } #endif /* HAVE_SYSV_TERMIO || HAVE_POSIX_TERMIOS */ /* If we've received a signal, get out now. */ if (FGOT_QUIT_SIGNAL ()) break; /* If we've already gotten a SIGALRM, get out with whatever we've accumulated. */ if (fSalarm) { fret = TRUE; break; } /* Right here is the race condition which we avoid by having the SIGALRM handler schedule another SIGALRM. */ cgot = read (q->oread, zbuf, cwant); /* If the read returned an error, check for signals. */ if (cgot < 0) { if (errno == EINTR) { /* Log the signal. */ ulog (LOG_ERROR, (const char *) NULL); } if (fSalarm) { fret = TRUE; break; } if (FGOT_QUIT_SIGNAL ()) break; } /* If read returned an error, get out. We just ignore EINTR here, since it must be from some signal we don't care about. If the read returned 0 then the line must have been hung up (normally we would have received SIGHUP, but we can't count on that). We turn off the signals before calling ulog to reduce problems with interrupted system calls. */ if (cgot <= 0) { if (cgot < 0 && errno == EINTR) cgot = 0; else { int ierr; ierr = errno; usset_signal (SIGALRM, SIG_IGN, TRUE, (boolean *) NULL); alarm (0); usysdep_end_catch (); if (freport) { if (cgot == 0) ulog (LOG_ERROR, "Line disconnected"); else ulog (LOG_ERROR, "read: %s", strerror (ierr)); } return FALSE; } } cwant -= cgot; cmin -= cgot; zbuf += cgot; *pclen += cgot; /* If we have enough data, get out now. */ if (cmin <= 0) { fret = TRUE; break; } #if HAVE_BSD_TTY /* We still want more data, so sleep long enough for the rest of it to arrive. We don't this for System V or POSIX because setting MIN is good enough (we can't sleep longer than it takes to get MAX_INPUT characters anyhow). The baud rate is approximately 10 times the number of characters which will arrive in one second, so the number of milliseconds to sleep == characters * (milliseconds / character) == characters * (1000 * (seconds / character)) == characters * (1000 * (1 / (baud / 10))) == characters * (10000 / baud) We arbitrarily reduce the sleep amount by 10 milliseconds to attempt to account for the amount of time it takes to set up the sleep. This is how long it takes to get half a character at 19200 baud. We then don't bother to sleep for less than 10 milliseconds. We don't sleep if the read was interrupted. We use select to sleep. It would be easy to use poll as well, but it's unlikely that any system with BSD ttys would have poll but not select. Using select avoids hassles with the pending SIGALRM; if it hits the select will be interrupted, and otherwise the select will not affect it. */ #if ! HAVE_SELECT #error This code requires select; feel free to extend it #endif if (q->fterminal && ! fpty && cmin > 1 && cgot > 0) { int csleepchars; int isleep; /* We don't try to read all the way up to MAX_INPUT, since that might drop a character. */ if (cmin <= MAX_INPUT - 10) csleepchars = cmin; else csleepchars = MAX_INPUT - 10; isleep = (int) (((long) csleepchars * 10000L) / q->ibaud); isleep -= 10; if (isleep > 10) { struct timeval s; s.tv_sec = isleep / 1000; s.tv_usec = (isleep % 1000) * 1000; /* Some versions of select take a pointer to an int, while some take a pointer to an fd_set. I just cast the arguments to a generic pointer, and assume that any machine which distinguishes int * from fd_set * (I would be amazed if there are any such machines) have an appropriate prototype somewhere or other. */ (void) select (0, (pointer) NULL, (pointer) NULL, (pointer) NULL, &s); /* Here either the select finished sleeping or we got a SIGALRM. If the latter occurred, fSalarm was set to TRUE; it will be checked at the top of the loop. */ } } #endif /* HAVE_BSD_TTY */ } /* Turn off the pending SIGALRM and return. */ usset_signal (SIGALRM, SIG_IGN, TRUE, (boolean *) NULL); alarm (0); usysdep_end_catch (); return fret; } /* Read from a stdin port. */ boolean fsysdep_stdin_read (qport, zbuf, pclen, cmin, ctimeout, freport) struct sport *qport; char *zbuf; int *pclen; int cmin; int ctimeout; boolean freport; { return fsserial_read (&qport->u.sstdin.s.s, zbuf, pclen, cmin, ctimeout, freport, qport->u.sstdin.s.fpty); } /* Read from a modem port. */ boolean fsysdep_modem_read (qport, zbuf, pclen, cmin, ctimeout, freport) struct sport *qport; char *zbuf; int *pclen; int cmin; int ctimeout; boolean freport; { return fsserial_read (&qport->u.smodem.s.s, zbuf, pclen, cmin, ctimeout, freport, FALSE); } /* Read from a direct port. */ boolean fsysdep_direct_read (qport, zbuf, pclen, cmin, ctimeout, freport) struct sport *qport; char *zbuf; int *pclen; int cmin; int ctimeout; boolean freport; { return fsserial_read (&qport->u.sdirect.s.s, zbuf, pclen, cmin, ctimeout, freport, FALSE); } /* Write data to a serial port. */ static boolean fsserial_write (q, zwrite, cwrite) struct ssysdep_serial_port *q; const char *zwrite; int cwrite; { int czero; /* We want blocking writes here. */ if (! fsblock (q, TRUE)) return FALSE; czero = 0; while (cwrite > 0) { int cdid; /* If we've received a signal, don't continue. */ if (FGOT_QUIT_SIGNAL ()) return FALSE; /* Loop until we don't get an interrupt. */ while ((cdid = write (q->owrite, zwrite, cwrite)) < 0 && errno == EINTR) { /* Log the signal. */ ulog (LOG_ERROR, (const char *) NULL); if (FGOT_QUIT_SIGNAL ()) return FALSE; } if (cdid < 0) { if (errno != EWOULDBLOCK && errno != EAGAIN) { ulog (LOG_ERROR, "write: %s", strerror (errno)); return FALSE; } cdid = 0; } if (cdid == 0) { /* On some systems write will return 0 if carrier is lost. If we fail to write anything ten times in a row, we assume that this has happened. This is hacked in like this because there seems to be no reliable way to tell exactly why the write returned 0. */ ++czero; if (czero >= 10) { ulog (LOG_ERROR, "Line disconnected"); return FALSE; } } else { czero = 0; cwrite -= cdid; zwrite += cdid; } } return TRUE; } /* Write to a stdin port. */ boolean fsysdep_stdin_write (qport, zwrite, cwrite) struct sport *qport; const char *zwrite; int cwrite; { return fsserial_write (&qport->u.sstdin.s.s, zwrite, cwrite); } /* Write to a modem port. */ boolean fsysdep_modem_write (qport, zwrite, cwrite) struct sport *qport; const char *zwrite; int cwrite; { return fsserial_write (&qport->u.smodem.s.s, zwrite, cwrite); } /* Write to a direct port. */ boolean fsysdep_direct_write (qport, zwrite, cwrite) struct sport *qport; const char *zwrite; int cwrite; { return fsserial_write (&qport->u.sdirect.s.s, zwrite, cwrite); } /* The fsysdep_io routine is supposed to both read and write data until it has either filled its read buffer or written out all the data it was given. This lets us write out large packets without losing incoming data. */ static boolean fsserial_io (q, zwrite, pcwrite, zread, pcread) struct ssysdep_serial_port *q; const char *zwrite; int *pcwrite; char *zread; int *pcread; { int cwrite, cread, czero; cwrite = *pcwrite; *pcwrite = 0; cread = *pcread; *pcread = 0; czero = 0; while (TRUE) { int cgot, cdo, cdid; /* If we've received a signal, don't continue. */ if (FGOT_QUIT_SIGNAL ()) return FALSE; /* This used to always use nonblocking writes, but it turns out that some systems don't support them on terminals. The current algorithm is: loop: unblocked read if read buffer full, return if nothing to write, return if HAVE_UNBLOCKED_WRITES write all data else write up to SINGLE_WRITE bytes if all data written, return if no data written blocked write of up to SINGLE_WRITE bytes This algorithm should work whether the system supports unblocked writes on terminals or not. If the system supports unblocked writes but HAVE_UNBLOCKED_WRITES is 0, then it will call write more often than it needs to. If the system does not support unblocked writes but HAVE_UNBLOCKED_WRITES is 1, then the write may hang so long that incoming data is lost. This is actually possible at high baud rates on any system when a blocking write is done; there is no solution, except hardware handshaking. */ /* Do an unblocked read. */ if (! fsblock (q, FALSE)) return FALSE; /* Loop until we get something (error or data) other than an acceptable EINTR. */ while ((cgot = read (q->oread, zread, cread)) < 0 && errno == EINTR) { /* Log the signal. */ ulog (LOG_ERROR, (const char *) NULL); if (FGOT_QUIT_SIGNAL ()) return FALSE; } if (cgot < 0) { if (errno != EAGAIN && errno != EWOULDBLOCK) { ulog (LOG_ERROR, "read: %s", strerror (errno)); return FALSE; } cgot = 0; } cread -= cgot; zread += cgot; *pcread += cgot; /* If we've filled the read buffer, or we have nothing left to write, return out. */ if (cread <= 0 || cwrite <= 0) return TRUE; /* The port is currently unblocked. Do a write. */ cdo = cwrite; #if ! HAVE_UNBLOCKED_WRITES if (cdo > SINGLE_WRITE) cdo = SINGLE_WRITE; #endif /* Loop until we get something besides EINTR. */ while ((cdid = write (q->owrite, zwrite, cdo)) < 0 && errno == EINTR) { /* Log the signal. */ ulog (LOG_ERROR, (const char *) NULL); if (FGOT_QUIT_SIGNAL ()) return FALSE; } if (cdid < 0) { if (errno != EWOULDBLOCK && errno != EAGAIN) { ulog (LOG_ERROR, "write: %s", strerror (errno)); return FALSE; } cdid = 0; } if (cdid > 0) { /* We wrote some data. If we wrote everything, return out. Otherwise loop around and do another read. */ cwrite -= cdid; zwrite += cdid; *pcwrite += cdid; if (cwrite <= 0) return TRUE; czero = 0; } else { /* We didn't write any data. Do a blocking write. */ if (! fsblock (q, TRUE)) return FALSE; cdo = cwrite; if (cdo > SINGLE_WRITE) cdo = SINGLE_WRITE; DEBUG_MESSAGE1 (DEBUG_PORT, "fsserial_io: Blocking write of %d", cdo); /* Loop until we get something besides EINTR. */ while ((cdid = write (q->owrite, zwrite, cdo)) < 0 && errno == EINTR) { /* Log the signal. */ ulog (LOG_ERROR, (const char *) NULL); if (FGOT_QUIT_SIGNAL ()) return FALSE; } if (cdid < 0) { ulog (LOG_ERROR, "write: %s", strerror (errno)); return FALSE; } if (cdid == 0) { /* On some systems write will return 0 if carrier is lost. If we fail to write anything ten times in a row, we assume that this has happened. This is hacked in like this because there seems to be no reliable way to tell exactly why the write returned 0. */ ++czero; if (czero >= 10) { ulog (LOG_ERROR, "Line disconnected"); return FALSE; } } else { cwrite -= cdid; zwrite += cdid; *pcwrite += cdid; czero = 0; } } } } /* I/O to a stdin port. */ boolean fsysdep_stdin_io (qport, zwrite, pcwrite, zread, pcread) struct sport *qport; const char *zwrite; int *pcwrite; char *zread; int *pcread; { return fsserial_io (&qport->u.sstdin.s.s, zwrite, pcwrite, zread, pcread); } /* I/O to a modem port. */ boolean fsysdep_modem_io (qport, zwrite, pcwrite, zread, pcread) struct sport *qport; const char *zwrite; int *pcwrite; char *zread; int *pcread; { return fsserial_io (&qport->u.smodem.s.s, zwrite, pcwrite, zread, pcread); } /* I/O to a direct port. */ boolean fsysdep_direct_io (qport, zwrite, pcwrite, zread, pcread) struct sport *qport; const char *zwrite; int *pcwrite; char *zread; int *pcread; { return fsserial_io (&qport->u.sdirect.s.s, zwrite, pcwrite, zread, pcread); } /* Send a break character to a serial port. */ static boolean fsserial_break (q) struct ssysdep_serial_port *q; { #if HAVE_BSD_TTY ioctl (q->owrite, TIOCSBRK, 0); sleep (1); ioctl (q->owrite, TIOCCBRK, 0); return TRUE; #endif /* HAVE_BSD_TTY */ #if HAVE_SYSV_TERMIO ioctl (q->owrite, TCSBRK, 0); return TRUE; #endif /* HAVE_SYSV_TERMIO */ #if HAVE_POSIX_TERMIOS return tcsendbreak (q->owrite, 0) == 0; #endif /* HAVE_POSIX_TERMIOS */ } /* Send a break character to a stdin port. */ boolean fsysdep_stdin_break (qport) struct sport *qport; { return fsserial_break (&qport->u.sstdin.s.s); } /* Send a break character to a modem port. */ boolean fsysdep_modem_break (qport) struct sport *qport; { return fsserial_break (&qport->u.smodem.s.s); } /* Send a break character to a direct port. */ boolean fsysdep_direct_break (qport) struct sport *qport; { return fsserial_break (&qport->u.sdirect.s.s); } /* Change the setting of a serial port. */ static boolean fsserial_set (q, tset) struct ssysdep_serial_port *q; enum tportsetting tset; { if (! q->fterminal) return TRUE; switch (tset) { case PORTSETTING_EIGHT: #if HAVE_BSD_TTY if (q->snew.sg_flags == (RAW | ANYP)) return TRUE; q->snew.sg_flags = RAW | ANYP; #endif #if HAVE_SYSV_TERMIO || HAVE_POSIX_TERMIOS if ((q->snew.c_iflag & ICLEAR_IFLAG) == 0) return TRUE; q->snew.c_iflag &=~ ICLEAR_IFLAG; #endif if (! fsetterminfodrain (q->oread, &q->snew)) { ulog (LOG_ERROR, "Can't go to raw mode: %s", strerror (errno)); return FALSE; } return TRUE; case PORTSETTING_SEVEN: #if HAVE_BSD_TTY if (q->snew.sg_flags == (CBREAK | ANYP | TANDEM)) return TRUE; q->snew.sg_flags = CBREAK | ANYP | TANDEM; #endif /* HAVE_BSD_TTY */ #if HAVE_SYSV_TERMIO | HAVE_POSIX_TERMIOS { int iwant; #ifdef CRTSCTS /* It would be nice to do this is in a more portable fashion, but in any case this is apparently correct for SunOS. If we are doing hardware flow control, we don't also send start and stop characters; however, we do recognize incoming start and stop characters. */ if ((q->snew.c_cflag & CRTSCTS) != 0) iwant = ISTRIP | IXON; else iwant = ISTRIP | IXON | IXOFF; #else /* ! defined (CRTSCTS) */ iwant = ISTRIP | IXON | IXOFF; #endif /* ! defined (CRTSCTS) */ if ((q->snew.c_iflag & ICLEAR_IFLAG) == iwant) return TRUE; q->snew.c_iflag &=~ ICLEAR_IFLAG; q->snew.c_iflag |= iwant; } #endif /* HAVE_SYSV_TERMIO | HAVE_POSIX_TERMIOS */ if (! fsetterminfodrain (q->oread, &q->snew)) { ulog (LOG_ERROR, "Can't go to seven bit mode: %s", strerror (errno)); return FALSE; } return TRUE; default: #if DEBUG > 0 ulog (LOG_FATAL, "fsserial_set: Can't happen"); #endif return FALSE; } } /* Change settings of a stdin port. */ boolean fsysdep_stdin_set (qport, tset) struct sport *qport; enum tportsetting tset; { return fsserial_set (&qport->u.sstdin.s.s, tset); } /* Change settings of a modem port. */ boolean fsysdep_modem_set (qport, tset) struct sport *qport; enum tportsetting tset; { return fsserial_set (&qport->u.smodem.s.s, tset); } /* Change settings of a direct port. */ boolean fsysdep_direct_set (qport, tset) struct sport *qport; enum tportsetting tset; { return fsserial_set (&qport->u.sdirect.s.s, tset); } /* Run a chat program. */ static boolean fsrun_chat (oread, owrite, zprog) int oread; int owrite; const char *zprog; { int cargs; const char **azargs; char *zcopy, *zarg; int aidescs[3]; FILE *e; pid_t ipid; char *z; /* Get the arguments into an array to pass to isspawn. */ zcopy = (char *) alloca (strlen (zprog) + 1); strcpy (zcopy, zprog); cargs = 0; for (zarg = strtok (zcopy, " \t"); zarg != NULL; zarg = strtok ((char *) NULL, " \t")) ++cargs; azargs = (const char **) alloca ((cargs + 1) * sizeof (const char *)); strcpy (zcopy, zprog); cargs = 0; for (zarg = strtok (zcopy, " \t"); zarg != NULL; zarg = strtok ((char *) NULL, " \t")) { azargs[cargs] = zarg; ++cargs; } azargs[cargs] = NULL; aidescs[0] = oread; aidescs[1] = owrite; aidescs[2] = SPAWN_READ_PIPE; /* Pass fkeepuid, fkeepenv and fshell as TRUE. This puts the responsibility of maintaing security on the chat program. */ ipid = isspawn (azargs, aidescs, TRUE, TRUE, (const char *) NULL, FALSE, TRUE, (const char *) NULL, (const char *) NULL, (const char *) NULL); if (ipid < 0) { ulog (LOG_ERROR, "isspawn (%s): %s", azargs[0], strerror (errno)); return FALSE; } e = fdopen (aidescs[2], (char *) "r"); if (e == NULL) { ulog (LOG_ERROR, "fdopen: %s", strerror (errno)); (void) close (aidescs[2]); (void) kill (ipid, SIGKILL); (void) iswait ((unsigned long) ipid, (const char *) NULL); return FALSE; } /* The FILE e now is attached to stderr of the program. Forward every line the program outputs to the log file. */ while ((z = zfgets (e, FALSE)) != NULL) { int clen; clen = strlen (z); if (z[clen - 1] == '\n') z[clen - 1] = '\0'; if (*z != '\0') ulog (LOG_NORMAL, "chat: %s", z); xfree ((pointer) z); } (void) fclose (e); return iswait ((unsigned long) ipid, "Chat program") == 0; } /* Run a chat program on a stdin port. */ boolean fsysdep_stdin_chat (qport, zprog) struct sport *qport; const char *zprog; { return fsrun_chat (qport->u.sstdin.s.s.oread, qport->u.sstdin.s.s.owrite, zprog); } /* Run a chat program on a modem port. */ boolean fsysdep_modem_chat (qport, zprog) struct sport *qport; const char *zprog; { return fsrun_chat (qport->u.smodem.s.s.oread, qport->u.smodem.s.s.owrite, zprog); } /* Run a chat program on a direct port. */ boolean fsysdep_direct_chat (qport, zprog) struct sport *qport; const char *zprog; { return fsrun_chat (qport->u.sdirect.s.s.oread, qport->u.sdirect.s.s.owrite, zprog); } #if HAVE_TCP /* Run a chat program on a TCP port. */ boolean fsysdep_tcp_chat (qport, zprog) struct sport *qport; const char *zprog; { return fsrun_chat (qport->u.stcp.o, qport->u.stcp.o, zprog); } #endif /* HAVE_TCP */ /* Functions to return baud rates. */ /* Return baud rate of a stdin port. */ long isysdep_stdin_baud (qport) struct sport *qport; { return qport->u.sstdin.s.s.ibaud; } /* Return baud rate of a modem port. */ long isysdep_modem_baud (qport) struct sport *qport; { return qport->u.smodem.s.s.ibaud; } /* Return baud rate of a direct port. */ long isysdep_direct_baud (qport) struct sport *qport; { return qport->u.sdirect.s.s.ibaud; } #if HAVE_TCP /* Some system dependent routines for TCP ports. These work by setting up an ssysdep_serial_port structure to fake out the serial port routines. I'm doing it this way to avoid having to write the complicated timeout code twice, and because the serial port code will work fine. It does mean that if the serial port code changes this code will have to be considered. */ /* Read data from a TCP port. */ boolean fsysdep_tcp_read (qport, zread, pclen, cmin, ctimeout, freport) struct sport *qport; char *zread; int *pclen; int cmin; int ctimeout; boolean freport; { struct ssysdep_serial_port s; s.oread = s.owrite = qport->u.stcp.o; s.fread_blocking = TRUE; s.fterminal = FALSE; return fsserial_read (&s, zread, pclen, cmin, ctimeout, freport, FALSE); } /* Write data to a TCP port. */ boolean fsysdep_tcp_write (qport, zwrite, cwrite) struct sport *qport; const char *zwrite; int cwrite; { struct ssysdep_serial_port s; s.oread = s.owrite = qport->u.stcp.o; s.fread_blocking = TRUE; s.fterminal = FALSE; return fsserial_write (&s, zwrite, cwrite); } /* Read and write data to and from a TCP port. We actually don't bother to really implement this, since the system will buffer up plenty of TCP data (only 256 bytes are buffered for a terminal, so losing data becomes a real possibility). */ boolean fsysdep_tcp_io (qport, zwrite, pcwrite, zread, pcread) struct sport *qport; const char *zwrite; int *pcwrite; char *zread; int *pcread; { struct ssysdep_serial_port s; s.oread = s.owrite = qport->u.stcp.o; s.fread_blocking = TRUE; s.fterminal = FALSE; *pcread = 0; return fsserial_write (&s, zwrite, *pcwrite); } #endif /* HAVE_TCP */ /* Local variables: mode:c End: */ @ 1.1.1.1 log @initial import of 386bsd-0.1 sources @ text @@ 1.1.1.2 log @Clean up deleted files. @ text @a25 3 Revision 1.1.1.1 1993/03/21 09:53:13 cgd initial import of 386bsd-0.1 sources d247 1 a247 1 char sys2_unx_rcsid[] = "$Id: sys2.unx,v 1.1.1.1 1993/03/21 09:53:13 cgd Exp mycroft $"; @