295 lines
7.1 KiB
C
295 lines
7.1 KiB
C
/* pipe.c
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The pipe port communication routines for Unix.
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Contributed by Marc Boucher <marc@CAM.ORG>.
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Copyright (C) 1993 Ian Lance Taylor
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This file is part of the Taylor UUCP package.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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The author of the program may be contacted at ian@airs.com or
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c/o Cygnus Support, Building 200, 1 Kendall Square, Cambridge, MA 02139.
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*/
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#include "uucp.h"
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#if USE_RCS_ID
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const char pipe_rcsid[] = "$Id: pipe.c,v 1.4 1994/03/25 04:09:30 ian Rel $";
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#endif
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#include "uudefs.h"
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#include "uuconf.h"
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#include "system.h"
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#include "conn.h"
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#include "sysdep.h"
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#include <errno.h>
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#if HAVE_FCNTL_H
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#include <fcntl.h>
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#else
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#if HAVE_SYS_FILE_H
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#include <sys/file.h>
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#endif
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#endif
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/* Local functions. */
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static void uspipe_free P((struct sconnection *qconn));
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static boolean fspipe_open P((struct sconnection *qconn, long ibaud,
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boolean fwait));
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static boolean fspipe_close P((struct sconnection *qconn,
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pointer puuconf,
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struct uuconf_dialer *qdialer,
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boolean fsuccess));
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static boolean fspipe_dial P((struct sconnection *qconn, pointer puuconf,
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const struct uuconf_system *qsys,
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const char *zphone,
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struct uuconf_dialer *qdialer,
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enum tdialerfound *ptdialer));
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/* The command table for standard input ports. */
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static const struct sconncmds spipecmds =
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{
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uspipe_free,
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NULL, /* pflock */
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NULL, /* pfunlock */
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fspipe_open,
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fspipe_close,
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fspipe_dial,
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fsdouble_read,
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fsdouble_write,
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fsysdep_conn_io,
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NULL, /* pfbreak */
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NULL, /* pfset */
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NULL, /* pfcarrier */
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fsdouble_chat,
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NULL /* pibaud */
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};
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/* Initialize a pipe connection. */
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boolean
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fsysdep_pipe_init (qconn)
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struct sconnection *qconn;
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{
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struct ssysdep_conn *q;
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q = (struct ssysdep_conn *) xmalloc (sizeof (struct ssysdep_conn));
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q->o = -1;
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q->ord = -1;
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q->owr = -1;
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q->zdevice = NULL;
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q->iflags = -1;
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q->iwr_flags = -1;
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q->fterminal = FALSE;
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q->ftli = FALSE;
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q->ibaud = 0;
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q->ipid = -1;
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qconn->psysdep = (pointer) q;
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qconn->qcmds = &spipecmds;
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return TRUE;
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}
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static void
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uspipe_free (qconn)
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struct sconnection *qconn;
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{
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xfree (qconn->psysdep);
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}
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/* Open a pipe port. */
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/*ARGSUSED*/
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static boolean
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fspipe_open (qconn, ibaud, fwait)
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struct sconnection *qconn;
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long ibaud;
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boolean fwait;
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{
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/* We don't do incoming waits on pipes. */
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if (fwait)
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return FALSE;
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return TRUE;
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}
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/* Close a pipe port. */
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/*ARGSUSED*/
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static boolean
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fspipe_close (qconn, puuconf, qdialer, fsuccess)
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struct sconnection *qconn;
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pointer puuconf;
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struct uuconf_dialer *qdialer;
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boolean fsuccess;
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{
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struct ssysdep_conn *qsysdep;
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boolean fret;
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qsysdep = (struct ssysdep_conn *) qconn->psysdep;
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fret = TRUE;
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/* Close our sides of the pipe. */
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if (qsysdep->ord >= 0 && close (qsysdep->ord) < 0)
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{
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ulog (LOG_ERROR, "fspipe_close: close read fd: %s", strerror (errno));
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fret = FALSE;
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}
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if (qsysdep->owr != qsysdep->ord
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&& qsysdep->owr >= 0
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&& close (qsysdep->owr) < 0)
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{
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ulog (LOG_ERROR, "fspipe_close: close write fd: %s", strerror (errno));
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fret = FALSE;
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}
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qsysdep->ord = -1;
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qsysdep->owr = -1;
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/* Kill dangling child process. */
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if (qsysdep->ipid >= 0)
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{
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if (kill (qsysdep->ipid, SIGHUP) == 0)
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usysdep_sleep (2);
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#ifdef SIGPIPE
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if (kill (qsysdep->ipid, SIGPIPE) == 0)
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usysdep_sleep (2);
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#endif
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if (kill (qsysdep->ipid, SIGKILL) < 0 && errno == EPERM)
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{
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ulog (LOG_ERROR, "fspipe_close: Cannot kill child pid %lu: %s",
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(unsigned long) qsysdep->ipid, strerror (errno));
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fret = FALSE;
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}
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else
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(void) ixswait ((unsigned long) qsysdep->ipid, (const char *) NULL);
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}
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qsysdep->ipid = -1;
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return fret;
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}
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/* Dial out on a pipe port, so to speak: launch connection program
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under us. The code alternates q->o between q->ord and q->owr as
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appropriate. It is always q->ord before any call to fsblock. */
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/*ARGSUSED*/
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static boolean
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fspipe_dial (qconn, puuconf, qsys, zphone, qdialer, ptdialer)
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struct sconnection *qconn;
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pointer puuconf;
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const struct uuconf_system *qsys;
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const char *zphone;
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struct uuconf_dialer *qdialer;
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enum tdialerfound *ptdialer;
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{
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struct ssysdep_conn *q;
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int aidescs[3];
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const char **pzprog;
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q = (struct ssysdep_conn *) qconn->psysdep;
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*ptdialer = DIALERFOUND_FALSE;
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pzprog = (const char **) qconn->qport->uuconf_u.uuconf_spipe.uuconf_pzcmd;
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if (pzprog == NULL)
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{
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ulog (LOG_ERROR, "No command for pipe connection");
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return FALSE;
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}
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aidescs[0] = SPAWN_WRITE_PIPE;
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aidescs[1] = SPAWN_READ_PIPE;
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aidescs[2] = SPAWN_NULL;
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/* Pass fkeepuid, fkeepenv and fshell as TRUE. This puts the
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responsibility of security on the connection program. */
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q->ipid = ixsspawn (pzprog, aidescs, TRUE, TRUE, (const char *) NULL,
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FALSE, TRUE, (const char *) NULL,
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(const char *) NULL, (const char *) NULL);
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if (q->ipid < 0)
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{
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ulog (LOG_ERROR, "ixsspawn (%s): %s", pzprog[0], strerror (errno));
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return FALSE;
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}
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q->owr = aidescs[0];
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q->ord = aidescs[1];
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q->o = q->ord;
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q->iflags = fcntl (q->ord, F_GETFL, 0);
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q->iwr_flags = fcntl (q->owr, F_GETFL, 0);
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if (q->iflags < 0 || q->iwr_flags < 0)
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{
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ulog (LOG_ERROR, "fspipe_dial: fcntl: %s", strerror (errno));
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(void) fspipe_close (qconn, puuconf, qdialer, FALSE);
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return FALSE;
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}
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return TRUE;
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}
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#if 0
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/* Marc Boucher's contributed code used an alarm to avoid waiting too
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long when closing the pipe. However, I believe that it is not
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possible for the kernel to sleep when closing a pipe; it is only
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possible when closing a device. Therefore, I have removed the
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code, but am preserving it in case I am wrong. To reenable it, the
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two calls to close in fspipe_close should be changed to call
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fspipe_alarmclose. */
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static RETSIGTYPE
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usalarm (isig)
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int isig;
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{
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#if ! HAVE_SIGACTION && ! HAVE_SIGVEC && ! HAVE_SIGSET
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(void) signal (isig, usalarm);
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#endif
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#if HAVE_RESTARTABLE_SYSCALLS
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longjmp (sSjmp_buf, 1);
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#endif
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}
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static int
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fspipe_alarmclose (fd)
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int fd;
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{
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int iret = -1;
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int ierrno = 0;
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if (fsysdep_catch ())
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{
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usysdep_start_catch ();
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usset_signal (SIGALRM, usalarm, TRUE, (boolean *) NULL);
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(void) alarm (30);
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iret = close (fd);
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ierrno = errno;
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}
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usset_signal (SIGALRM, SIG_IGN, TRUE, (boolean *) NULL);
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(void) alarm (0);
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usysdep_end_catch ();
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errno = ierrno;
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return iret;
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}
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#endif /* 0 */
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