158 lines
4 KiB
C
158 lines
4 KiB
C
/* Serial interface for a pipe to a separate program
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Copyright 1999 Free Software Foundation, Inc.
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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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the Free Software Foundation; either version 2 of the License, or
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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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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "serial.h"
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#include "ser-unix.h"
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#include <sys/types.h>
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#ifdef HAVE_SYS_WAIT_H
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#include <sys/wait.h>
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#endif
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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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#include <string.h>
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#include "signals.h"
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static int pipe_open (serial_t scb, const char *name);
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static void pipe_close (serial_t scb);
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extern void _initialize_ser_pipe (void);
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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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/* Open up a raw pipe */
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static int
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pipe_open (serial_t scb, const char *name)
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{
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#if !HAVE_SOCKETPAIR
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return -1;
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#else
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struct pipe_state *state;
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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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int pid;
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if (socketpair (AF_UNIX, SOCK_STREAM, 0, pdes) < 0)
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return -1;
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pid = vfork ();
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/* Error. */
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if (pid == -1)
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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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/* Child. */
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if (pid == 0)
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{
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/* re-wire pdes[1] to stdin/stdout */
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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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#if 0
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/* close any stray FD's - FIXME - how? */
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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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parent process are closed in the new child process. */
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for (old = pidlist; old; old = old->next)
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close (fileno (old->fp)); /* don't allow a flush */
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#endif
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execl ("/bin/sh", "sh", "-c", name, NULL);
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_exit (127);
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}
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/* Parent. */
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close (pdes[1]);
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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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scb->fd = pdes[0];
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scb->state = state;
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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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pipe_close (serial_t scb)
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{
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struct pipe_state *state = scb->state;
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if (state != NULL)
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{
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int pid = state->pid;
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close (scb->fd);
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scb->fd = -1;
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free (state);
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scb->state = NULL;
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kill (pid, SIGTERM);
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/* Might be useful to check that the child does die. */
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}
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}
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static struct serial_ops pipe_ops;
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void
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_initialize_ser_pipe (void)
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{
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struct serial_ops *ops = XMALLOC (struct serial_ops);
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memset (ops, sizeof (struct serial_ops), 0);
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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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ops->readchar = ser_unix_readchar;
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ops->write = ser_unix_write;
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ops->flush_output = ser_unix_nop_flush_output;
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ops->flush_input = ser_unix_flush_input;
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ops->send_break = ser_unix_nop_send_break;
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ops->go_raw = ser_unix_nop_raw;
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ops->get_tty_state = ser_unix_nop_get_tty_state;
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ops->set_tty_state = ser_unix_nop_set_tty_state;
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ops->print_tty_state = ser_unix_nop_print_tty_state;
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ops->noflush_set_tty_state = ser_unix_nop_noflush_set_tty_state;
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ops->setbaudrate = ser_unix_nop_setbaudrate;
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ops->setstopbits = ser_unix_nop_setstopbits;
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ops->drain_output = ser_unix_nop_drain_output;
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ops->async = ser_unix_async;
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serial_add_interface (ops);
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}
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