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/* Serial interface for a pipe to a separate program
Copyright (C) 1999, 2000, 2001, 2007, 2008, 2009, 2010, 2011
Free Software Foundation, Inc.
Contributed by Cygnus Solutions.
This file is part of GDB.
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 3 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, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "serial.h"
#include "ser-base.h"
#include "ser-unix.h"
#include "gdb_vfork.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <fcntl.h>
#include "gdb_string.h"
#include <signal.h>
static int pipe_open (struct serial *scb, const char *name);
static void pipe_close (struct serial *scb);
extern void _initialize_ser_pipe (void);
struct pipe_state
{
int pid;
};
/* Open up a raw pipe. */
static int
pipe_open (struct serial *scb, const char *name)
{
#if !HAVE_SOCKETPAIR
return -1;
#else
struct pipe_state *state;
/* This chunk: */
/* Copyright (c) 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software written by Ken Arnold and
* published in UNIX Review, Vol. 6, No. 8.
*/
int pdes[2];
int err_pdes[2];
int pid;
if (socketpair (AF_UNIX, SOCK_STREAM, 0, pdes) < 0)
return -1;
if (socketpair (AF_UNIX, SOCK_STREAM, 0, err_pdes) < 0)
{
close (pdes[0]);
close (pdes[1]);
return -1;
}
/* Create the child process to run the command in. Note that the
apparent call to vfork() below *might* actually be a call to
fork() due to the fact that autoconf will ``#define vfork fork''
on certain platforms. */
pid = vfork ();
/* Error. */
if (pid == -1)
{
close (pdes[0]);
close (pdes[1]);
close (err_pdes[0]);
close (err_pdes[1]);
return -1;
}
if (fcntl (err_pdes[0], F_SETFL, O_NONBLOCK) == -1)
{
close (err_pdes[0]);
close (err_pdes[1]);
err_pdes[0] = err_pdes[1] = -1;
}
/* Child. */
if (pid == 0)
{
/* We don't want ^c to kill the connection. */
#ifdef HAVE_SETSID
pid_t sid = setsid ();
if (sid == -1)
signal (SIGINT, SIG_IGN);
#else
signal (SIGINT, SIG_IGN);
#endif
/* Re-wire pdes[1] to stdin/stdout. */
close (pdes[0]);
if (pdes[1] != STDOUT_FILENO)
{
dup2 (pdes[1], STDOUT_FILENO);
close (pdes[1]);
}
dup2 (STDOUT_FILENO, STDIN_FILENO);
if (err_pdes[0] != -1)
{
close (err_pdes[0]);
dup2 (err_pdes[1], STDERR_FILENO);
close (err_pdes[1]);
}
#if 0
/* close any stray FD's - FIXME - how? */
/* POSIX.2 B.3.2.2 "popen() shall ensure that any streams
from previous popen() calls that remain open in the
parent process are closed in the new child process. */
for (old = pidlist; old; old = old->next)
close (fileno (old->fp)); /* Don't allow a flush. */
#endif
execl ("/bin/sh", "sh", "-c", name, (char *) 0);
_exit (127);
}
/* Parent. */
close (pdes[1]);
if (err_pdes[1] != -1)
close (err_pdes[1]);
/* :end chunk */
state = XMALLOC (struct pipe_state);
state->pid = pid;
scb->fd = pdes[0];
scb->error_fd = err_pdes[0];
scb->state = state;
/* If we don't do this, GDB simply exits when the remote side dies. */
signal (SIGPIPE, SIG_IGN);
return 0;
#endif
}
static void
pipe_close (struct serial *scb)
{
struct pipe_state *state = scb->state;
close (scb->fd);
scb->fd = -1;
if (state != NULL)
{
int wait_result, status;
/* Don't kill the task right away, give it a chance to shut down cleanly.
But don't wait forever though. */
#define PIPE_CLOSE_TIMEOUT 5
/* Assume the program will exit after SIGTERM. Might be
useful to print any remaining stderr output from
scb->error_fd while waiting. */
#define SIGTERM_TIMEOUT INT_MAX
wait_result = -1;
#ifdef HAVE_WAITPID
wait_result = wait_to_die_with_timeout (state->pid, &status,
PIPE_CLOSE_TIMEOUT);
#endif
if (wait_result == -1)
{
kill (state->pid, SIGTERM);
#ifdef HAVE_WAITPID
wait_to_die_with_timeout (state->pid, &status, SIGTERM_TIMEOUT);
#endif
}
if (scb->error_fd != -1)
close (scb->error_fd);
scb->error_fd = -1;
xfree (state);
scb->state = NULL;
}
}
int
gdb_pipe (int pdes[2])
{
#if !HAVE_SOCKETPAIR
errno = ENOSYS;
return -1;
#else
if (socketpair (AF_UNIX, SOCK_STREAM, 0, pdes) < 0)
return -1;
/* If we don't do this, GDB simply exits when the remote side
dies. */
signal (SIGPIPE, SIG_IGN);
return 0;
#endif
}
void
_initialize_ser_pipe (void)
{
struct serial_ops *ops = XMALLOC (struct serial_ops);
memset (ops, 0, sizeof (struct serial_ops));
ops->name = "pipe";
ops->next = 0;
ops->open = pipe_open;
ops->close = pipe_close;
ops->readchar = ser_base_readchar;
ops->write = ser_base_write;
ops->flush_output = ser_base_flush_output;
ops->flush_input = ser_base_flush_input;
ops->send_break = ser_base_send_break;
ops->go_raw = ser_base_raw;
ops->get_tty_state = ser_base_get_tty_state;
ops->copy_tty_state = ser_base_copy_tty_state;
ops->set_tty_state = ser_base_set_tty_state;
ops->print_tty_state = ser_base_print_tty_state;
ops->noflush_set_tty_state = ser_base_noflush_set_tty_state;
ops->setbaudrate = ser_base_setbaudrate;
ops->setstopbits = ser_base_setstopbits;
ops->drain_output = ser_base_drain_output;
ops->async = ser_base_async;
ops->read_prim = ser_unix_read_prim;
ops->write_prim = ser_unix_write_prim;
serial_add_interface (ops);
}
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