1 /* Serial interface for a pipe to a separate program
2 Copyright (C) 1999-2014 Free Software Foundation, Inc.
4 Contributed by Cygnus Solutions.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
26 #include "gdb_vfork.h"
28 #include <sys/types.h>
29 #include <sys/socket.h>
33 #include "filestuff.h"
37 static int pipe_open (struct serial *scb, const char *name);
38 static void pipe_close (struct serial *scb);
40 extern void _initialize_ser_pipe (void);
47 /* Open up a raw pipe. */
50 pipe_open (struct serial *scb, const char *name)
55 struct pipe_state *state;
57 /* Copyright (c) 1988, 1993
58 * The Regents of the University of California. All rights reserved.
60 * This code is derived from software written by Ken Arnold and
61 * published in UNIX Review, Vol. 6, No. 8.
67 if (gdb_socketpair_cloexec (AF_UNIX, SOCK_STREAM, 0, pdes) < 0)
69 if (gdb_socketpair_cloexec (AF_UNIX, SOCK_STREAM, 0, err_pdes) < 0)
76 /* Create the child process to run the command in. Note that the
77 apparent call to vfork() below *might* actually be a call to
78 fork() due to the fact that autoconf will ``#define vfork fork''
79 on certain platforms. */
92 if (fcntl (err_pdes[0], F_SETFL, O_NONBLOCK) == -1)
96 err_pdes[0] = err_pdes[1] = -1;
102 /* We don't want ^c to kill the connection. */
104 pid_t sid = setsid ();
106 signal (SIGINT, SIG_IGN);
108 signal (SIGINT, SIG_IGN);
111 /* Re-wire pdes[1] to stdin/stdout. */
113 if (pdes[1] != STDOUT_FILENO)
115 dup2 (pdes[1], STDOUT_FILENO);
118 dup2 (STDOUT_FILENO, STDIN_FILENO);
120 if (err_pdes[0] != -1)
123 dup2 (err_pdes[1], STDERR_FILENO);
128 execl ("/bin/sh", "sh", "-c", name, (char *) 0);
134 if (err_pdes[1] != -1)
137 state = XMALLOC (struct pipe_state);
140 scb->error_fd = err_pdes[0];
143 /* If we don't do this, GDB simply exits when the remote side dies. */
144 signal (SIGPIPE, SIG_IGN);
150 pipe_close (struct serial *scb)
152 struct pipe_state *state = scb->state;
159 int wait_result, status;
161 /* Don't kill the task right away, give it a chance to shut down cleanly.
162 But don't wait forever though. */
163 #define PIPE_CLOSE_TIMEOUT 5
165 /* Assume the program will exit after SIGTERM. Might be
166 useful to print any remaining stderr output from
167 scb->error_fd while waiting. */
168 #define SIGTERM_TIMEOUT INT_MAX
172 wait_result = wait_to_die_with_timeout (state->pid, &status,
175 if (wait_result == -1)
177 kill (state->pid, SIGTERM);
179 wait_to_die_with_timeout (state->pid, &status, SIGTERM_TIMEOUT);
183 if (scb->error_fd != -1)
184 close (scb->error_fd);
192 gdb_pipe (int pdes[2])
199 if (gdb_socketpair_cloexec (AF_UNIX, SOCK_STREAM, 0, pdes) < 0)
202 /* If we don't do this, GDB simply exits when the remote side
204 signal (SIGPIPE, SIG_IGN);
209 static const struct serial_ops pipe_ops =
217 ser_base_flush_output,
218 ser_base_flush_input,
221 ser_base_get_tty_state,
222 ser_base_copy_tty_state,
223 ser_base_set_tty_state,
224 ser_base_print_tty_state,
225 ser_base_noflush_set_tty_state,
226 ser_base_setbaudrate,
227 ser_base_setstopbits,
228 ser_base_drain_output,
235 _initialize_ser_pipe (void)
237 serial_add_interface (&pipe_ops);