1999-07-12 18:08:43 +00:00
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/* Serial interface for a pipe to a separate program
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2013-01-01 06:33:28 +00:00
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Copyright (C) 1999-2013 Free Software Foundation, Inc.
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1999-07-12 18:08:43 +00:00
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Contributed by Cygnus Solutions.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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2007-08-23 18:08:50 +00:00
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the Free Software Foundation; either version 3 of the License, or
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1999-07-12 18:08:43 +00:00
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU 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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2007-08-23 18:08:50 +00:00
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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1999-07-12 18:08:43 +00:00
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#include "defs.h"
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#include "serial.h"
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2005-03-25 19:47:23 +00:00
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#include "ser-base.h"
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1999-09-22 03:28:34 +00:00
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#include "ser-unix.h"
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2001-01-31 02:08:23 +00:00
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#include "gdb_vfork.h"
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1999-07-12 18:08:43 +00:00
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <fcntl.h>
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2001-01-31 15:46:36 +00:00
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#include "gdb_string.h"
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1999-07-12 18:08:43 +00:00
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2001-02-06 04:17:03 +00:00
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#include <signal.h>
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1999-07-12 18:08:43 +00:00
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2001-07-11 17:52:32 +00:00
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static int pipe_open (struct serial *scb, const char *name);
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static void pipe_close (struct serial *scb);
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1999-07-19 23:30:11 +00:00
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1999-09-22 03:28:34 +00:00
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extern void _initialize_ser_pipe (void);
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1999-07-19 23:30:11 +00:00
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struct pipe_state
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{
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int pid;
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};
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2011-01-11 21:53:25 +00:00
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/* Open up a raw pipe. */
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1999-07-12 18:08:43 +00:00
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static int
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2001-07-11 17:52:32 +00:00
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pipe_open (struct serial *scb, const char *name)
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1999-07-12 18:08:43 +00:00
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{
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1999-10-05 23:13:56 +00:00
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#if !HAVE_SOCKETPAIR
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1999-07-12 18:08:43 +00:00
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return -1;
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#else
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1999-07-19 23:30:11 +00:00
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struct pipe_state *state;
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1999-07-12 18:08:43 +00:00
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/* This chunk: */
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/* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software written by Ken Arnold and
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* published in UNIX Review, Vol. 6, No. 8.
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*/
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int pdes[2];
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2007-04-08 15:20:07 +00:00
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int err_pdes[2];
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1999-07-12 18:08:43 +00:00
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int pid;
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2010-05-16 23:49:58 +00:00
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1999-07-12 18:08:43 +00:00
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if (socketpair (AF_UNIX, SOCK_STREAM, 0, pdes) < 0)
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return -1;
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2007-04-08 15:20:07 +00:00
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if (socketpair (AF_UNIX, SOCK_STREAM, 0, err_pdes) < 0)
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2010-04-20 05:52:07 +00:00
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{
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close (pdes[0]);
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close (pdes[1]);
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return -1;
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}
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1999-07-12 18:08:43 +00:00
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2001-04-08 18:26:03 +00:00
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/* Create the child process to run the command in. Note that the
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apparent call to vfork() below *might* actually be a call to
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fork() due to the fact that autoconf will ``#define vfork fork''
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on certain platforms. */
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1999-07-19 23:30:11 +00:00
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pid = vfork ();
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2011-01-11 21:53:25 +00:00
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/* Error. */
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1999-07-19 23:30:11 +00:00
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if (pid == -1)
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1999-07-12 18:08:43 +00:00
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{
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close (pdes[0]);
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close (pdes[1]);
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2007-04-08 15:20:07 +00:00
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close (err_pdes[0]);
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close (err_pdes[1]);
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1999-07-12 18:08:43 +00:00
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return -1;
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1999-07-19 23:30:11 +00:00
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}
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2007-04-08 15:20:07 +00:00
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if (fcntl (err_pdes[0], F_SETFL, O_NONBLOCK) == -1)
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{
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close (err_pdes[0]);
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close (err_pdes[1]);
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err_pdes[0] = err_pdes[1] = -1;
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}
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2011-01-11 21:53:25 +00:00
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/* Child. */
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1999-07-19 23:30:11 +00:00
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if (pid == 0)
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{
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2010-05-25 16:00:09 +00:00
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/* We don't want ^c to kill the connection. */
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#ifdef HAVE_SETSID
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pid_t sid = setsid ();
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if (sid == -1)
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signal (SIGINT, SIG_IGN);
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#else
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signal (SIGINT, SIG_IGN);
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#endif
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2011-01-11 21:53:25 +00:00
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/* Re-wire pdes[1] to stdin/stdout. */
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1999-07-12 18:08:43 +00:00
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close (pdes[0]);
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if (pdes[1] != STDOUT_FILENO)
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{
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dup2 (pdes[1], STDOUT_FILENO);
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close (pdes[1]);
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}
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dup2 (STDOUT_FILENO, STDIN_FILENO);
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2007-04-08 15:20:07 +00:00
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if (err_pdes[0] != -1)
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{
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close (err_pdes[0]);
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dup2 (err_pdes[1], STDERR_FILENO);
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close (err_pdes[1]);
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}
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1999-07-19 23:30:11 +00:00
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#if 0
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2011-01-11 21:53:25 +00:00
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/* close any stray FD's - FIXME - how? */
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1999-07-19 23:30:11 +00:00
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/* POSIX.2 B.3.2.2 "popen() shall ensure that any streams
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from previous popen() calls that remain open in the
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2011-01-11 21:53:25 +00:00
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parent process are closed in the new child process. */
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1999-07-19 23:30:11 +00:00
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for (old = pidlist; old; old = old->next)
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2011-01-11 21:53:25 +00:00
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close (fileno (old->fp)); /* Don't allow a flush. */
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1999-07-19 23:30:11 +00:00
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#endif
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2004-01-22 22:20:39 +00:00
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execl ("/bin/sh", "sh", "-c", name, (char *) 0);
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1999-07-12 18:08:43 +00:00
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_exit (127);
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}
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2011-01-11 21:53:25 +00:00
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/* Parent. */
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1999-07-12 18:08:43 +00:00
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close (pdes[1]);
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2010-04-20 05:52:07 +00:00
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if (err_pdes[1] != -1)
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close (err_pdes[1]);
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1999-07-19 23:30:11 +00:00
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/* :end chunk */
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state = XMALLOC (struct pipe_state);
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state->pid = pid;
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1999-07-12 18:08:43 +00:00
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scb->fd = pdes[0];
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2007-04-08 15:20:07 +00:00
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scb->error_fd = err_pdes[0];
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1999-07-19 23:30:11 +00:00
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scb->state = state;
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1999-07-12 18:08:43 +00:00
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/* If we don't do this, GDB simply exits when the remote side dies. */
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signal (SIGPIPE, SIG_IGN);
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return 0;
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#endif
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}
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static void
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2001-07-11 17:52:32 +00:00
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pipe_close (struct serial *scb)
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1999-07-12 18:08:43 +00:00
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{
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1999-07-19 23:30:11 +00:00
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struct pipe_state *state = scb->state;
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2010-05-16 23:49:58 +00:00
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2010-08-20 18:49:20 +00:00
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close (scb->fd);
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scb->fd = -1;
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1999-07-19 23:30:11 +00:00
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if (state != NULL)
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{
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2011-12-14 20:53:57 +00:00
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int wait_result, status;
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/* Don't kill the task right away, give it a chance to shut down cleanly.
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But don't wait forever though. */
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#define PIPE_CLOSE_TIMEOUT 5
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2010-09-02 17:12:38 +00:00
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/* Assume the program will exit after SIGTERM. Might be
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useful to print any remaining stderr output from
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scb->error_fd while waiting. */
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2011-12-14 20:53:57 +00:00
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#define SIGTERM_TIMEOUT INT_MAX
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wait_result = -1;
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#ifdef HAVE_WAITPID
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wait_result = wait_to_die_with_timeout (state->pid, &status,
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PIPE_CLOSE_TIMEOUT);
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2010-09-02 17:12:38 +00:00
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#endif
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2011-12-14 20:53:57 +00:00
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if (wait_result == -1)
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{
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kill (state->pid, SIGTERM);
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#ifdef HAVE_WAITPID
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wait_to_die_with_timeout (state->pid, &status, SIGTERM_TIMEOUT);
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#endif
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}
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2010-04-20 05:52:07 +00:00
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if (scb->error_fd != -1)
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close (scb->error_fd);
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scb->error_fd = -1;
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2000-12-15 01:01:51 +00:00
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xfree (state);
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1999-07-19 23:30:11 +00:00
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scb->state = NULL;
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}
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1999-07-12 18:08:43 +00:00
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}
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2010-08-20 18:49:20 +00:00
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int
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gdb_pipe (int pdes[2])
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{
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#if !HAVE_SOCKETPAIR
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errno = ENOSYS;
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return -1;
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#else
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if (socketpair (AF_UNIX, SOCK_STREAM, 0, pdes) < 0)
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return -1;
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/* If we don't do this, GDB simply exits when the remote side
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dies. */
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signal (SIGPIPE, SIG_IGN);
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return 0;
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#endif
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}
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1999-07-12 18:08:43 +00:00
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void
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1999-09-22 03:28:34 +00:00
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_initialize_ser_pipe (void)
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1999-07-12 18:08:43 +00:00
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{
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1999-09-22 03:28:34 +00:00
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struct serial_ops *ops = XMALLOC (struct serial_ops);
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2010-05-16 23:49:58 +00:00
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2003-05-13 19:40:11 +00:00
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memset (ops, 0, sizeof (struct serial_ops));
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1999-09-22 03:28:34 +00:00
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ops->name = "pipe";
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ops->next = 0;
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ops->open = pipe_open;
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ops->close = pipe_close;
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2005-04-21 05:34:33 +00:00
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ops->readchar = ser_base_readchar;
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2005-03-25 20:06:36 +00:00
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ops->write = ser_base_write;
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ops->flush_output = ser_base_flush_output;
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ops->flush_input = ser_base_flush_input;
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ops->send_break = ser_base_send_break;
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ops->go_raw = ser_base_raw;
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ops->get_tty_state = ser_base_get_tty_state;
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2011-03-04 19:23:42 +00:00
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ops->copy_tty_state = ser_base_copy_tty_state;
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2005-03-25 20:06:36 +00:00
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ops->set_tty_state = ser_base_set_tty_state;
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ops->print_tty_state = ser_base_print_tty_state;
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ops->noflush_set_tty_state = ser_base_noflush_set_tty_state;
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ops->setbaudrate = ser_base_setbaudrate;
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ops->setstopbits = ser_base_setstopbits;
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ops->drain_output = ser_base_drain_output;
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ops->async = ser_base_async;
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2005-04-21 05:34:33 +00:00
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ops->read_prim = ser_unix_read_prim;
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ops->write_prim = ser_unix_write_prim;
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1999-09-22 03:28:34 +00:00
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serial_add_interface (ops);
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1999-07-12 18:08:43 +00:00
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}
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