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/* Serial interface for a pipe to a separate program
Copyright 1999 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 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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "serial.h"
#include "ser-unix.h"
#include <sys/types.h>
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#include <sys/socket.h>
#include <sys/time.h>
#include <fcntl.h>
#include "signals.h"
static int pipe_open (serial_t scb, const char *name);
static void pipe_close (serial_t scb);
extern void _initialize_ser_pipe (void);
struct pipe_state
{
int pid;
};
/* Open up a raw pipe */
static int
pipe_open (serial_t scb, const char *name)
{
#if !defined(O_NONBLOCK) || !defined(F_GETFL) || !defined(F_SETFL) || !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 pid;
if (socketpair (AF_UNIX, SOCK_STREAM, 0, pdes) < 0)
return -1;
pid = vfork ();
/* Error. */
if (pid == -1)
{
close (pdes[0]);
close (pdes[1]);
return -1;
}
/* Child. */
if (pid == 0)
{
/* 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 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, NULL);
_exit (127);
}
/* Parent. */
close (pdes[1]);
/* :end chunk */
state = XMALLOC (struct pipe_state);
state->pid = pid;
scb->fd = pdes[0];
scb->state = state;
/* Make it non-blocking */
{
int flags = fcntl (scb->fd, F_GETFL, 0);
if (fcntl (scb->fd, F_SETFL, flags | O_NONBLOCK) < 0)
{
perror ("ser-pipe");
pipe_close (scb);
return -1;
}
}
/* 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 (serial_t scb)
{
struct pipe_state *state = scb->state;
if (state != NULL)
{
int pid = state->pid;
close (scb->fd);
scb->fd = -1;
free (state);
scb->state = NULL;
kill (pid, SIGTERM);
/* Might be useful to check that the child does die. */
}
}
static struct serial_ops pipe_ops;
void
_initialize_ser_pipe (void)
{
struct serial_ops *ops = XMALLOC (struct serial_ops);
memset (ops, sizeof (struct serial_ops), 0);
ops->name = "pipe";
ops->next = 0;
ops->open = pipe_open;
ops->close = pipe_close;
ops->readchar = ser_unix_readchar;
ops->write = ser_unix_write;
ops->flush_output = ser_unix_nop_flush_output;
ops->flush_input = ser_unix_nop_flush_input;
ops->send_break = ser_unix_nop_send_break;
ops->go_raw = ser_unix_nop_raw;
ops->get_tty_state = ser_unix_nop_get_tty_state;
ops->set_tty_state = ser_unix_nop_set_tty_state;
ops->print_tty_state = ser_unix_nop_print_tty_state;
ops->noflush_set_tty_state = ser_unix_nop_noflush_set_tty_state;
ops->setbaudrate = ser_unix_nop_setbaudrate;
ops->setstopbits = ser_unix_nop_setstopbits;
ops->drain_output = ser_unix_nop_drain_output;
ops->async = ser_unix_async;
serial_add_interface (ops);
}
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