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e2882c8578
gdb/ChangeLog: Update copyright year range in all GDB files
236 lines
5.2 KiB
C
236 lines
5.2 KiB
C
/* Serial interface for a pipe to a separate program
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Copyright (C) 1999-2018 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 3 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, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "serial.h"
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#include "ser-base.h"
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#include "ser-unix.h"
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#include "gdb_vfork.h"
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#include <sys/types.h>
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#include <sys/socket.h>
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#include "gdb_sys_time.h"
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#include <fcntl.h>
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#include "filestuff.h"
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#include <signal.h>
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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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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 (struct serial *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 err_pdes[2];
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int pid;
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if (gdb_socketpair_cloexec (AF_UNIX, SOCK_STREAM, 0, pdes) < 0)
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return -1;
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if (gdb_socketpair_cloexec (AF_UNIX, SOCK_STREAM, 0, err_pdes) < 0)
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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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/* 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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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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close (err_pdes[0]);
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close (err_pdes[1]);
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return -1;
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}
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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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/* Child. */
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if (pid == 0)
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{
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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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/* 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 (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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close_most_fds ();
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execl ("/bin/sh", "sh", "-c", name, (char *) 0);
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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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if (err_pdes[1] != -1)
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close (err_pdes[1]);
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/* :end chunk */
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state = XNEW (struct pipe_state);
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state->pid = pid;
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scb->fd = pdes[0];
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scb->error_fd = err_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 (struct serial *scb)
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{
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struct pipe_state *state = (struct pipe_state *) scb->state;
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close (scb->fd);
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scb->fd = -1;
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if (state != NULL)
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{
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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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/* 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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#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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#endif
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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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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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xfree (state);
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scb->state = NULL;
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}
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}
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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 (gdb_socketpair_cloexec (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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static const struct serial_ops pipe_ops =
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{
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"pipe",
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pipe_open,
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pipe_close,
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NULL,
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ser_base_readchar,
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ser_base_write,
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ser_base_flush_output,
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ser_base_flush_input,
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ser_base_send_break,
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ser_base_raw,
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ser_base_get_tty_state,
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ser_base_copy_tty_state,
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ser_base_set_tty_state,
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ser_base_print_tty_state,
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ser_base_setbaudrate,
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ser_base_setstopbits,
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ser_base_setparity,
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ser_base_drain_output,
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ser_base_async,
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ser_unix_read_prim,
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ser_unix_write_prim
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};
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void
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_initialize_ser_pipe (void)
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{
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serial_add_interface (&pipe_ops);
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}
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