1 /* Serial interface for a pipe to a separate program
2 Copyright (C) 1999-2015 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>
30 #include "gdb_sys_time.h"
32 #include "filestuff.h"
36 static int pipe_open (struct serial *scb, const char *name);
37 static void pipe_close (struct serial *scb);
39 extern void _initialize_ser_pipe (void);
46 /* Open up a raw pipe. */
49 pipe_open (struct serial *scb, const char *name)
54 struct pipe_state *state;
56 /* Copyright (c) 1988, 1993
57 * The Regents of the University of California. All rights reserved.
59 * This code is derived from software written by Ken Arnold and
60 * published in UNIX Review, Vol. 6, No. 8.
66 if (gdb_socketpair_cloexec (AF_UNIX, SOCK_STREAM, 0, pdes) < 0)
68 if (gdb_socketpair_cloexec (AF_UNIX, SOCK_STREAM, 0, err_pdes) < 0)
75 /* Create the child process to run the command in. Note that the
76 apparent call to vfork() below *might* actually be a call to
77 fork() due to the fact that autoconf will ``#define vfork fork''
78 on certain platforms. */
91 if (fcntl (err_pdes[0], F_SETFL, O_NONBLOCK) == -1)
95 err_pdes[0] = err_pdes[1] = -1;
101 /* We don't want ^c to kill the connection. */
103 pid_t sid = setsid ();
105 signal (SIGINT, SIG_IGN);
107 signal (SIGINT, SIG_IGN);
110 /* Re-wire pdes[1] to stdin/stdout. */
112 if (pdes[1] != STDOUT_FILENO)
114 dup2 (pdes[1], STDOUT_FILENO);
117 dup2 (STDOUT_FILENO, STDIN_FILENO);
119 if (err_pdes[0] != -1)
122 dup2 (err_pdes[1], STDERR_FILENO);
127 execl ("/bin/sh", "sh", "-c", name, (char *) 0);
133 if (err_pdes[1] != -1)
136 state = XNEW (struct pipe_state);
139 scb->error_fd = err_pdes[0];
142 /* If we don't do this, GDB simply exits when the remote side dies. */
143 signal (SIGPIPE, SIG_IGN);
149 pipe_close (struct serial *scb)
151 struct pipe_state *state = scb->state;
158 int wait_result, status;
160 /* Don't kill the task right away, give it a chance to shut down cleanly.
161 But don't wait forever though. */
162 #define PIPE_CLOSE_TIMEOUT 5
164 /* Assume the program will exit after SIGTERM. Might be
165 useful to print any remaining stderr output from
166 scb->error_fd while waiting. */
167 #define SIGTERM_TIMEOUT INT_MAX
171 wait_result = wait_to_die_with_timeout (state->pid, &status,
174 if (wait_result == -1)
176 kill (state->pid, SIGTERM);
178 wait_to_die_with_timeout (state->pid, &status, SIGTERM_TIMEOUT);
182 if (scb->error_fd != -1)
183 close (scb->error_fd);
191 gdb_pipe (int pdes[2])
198 if (gdb_socketpair_cloexec (AF_UNIX, SOCK_STREAM, 0, pdes) < 0)
201 /* If we don't do this, GDB simply exits when the remote side
203 signal (SIGPIPE, SIG_IGN);
208 static const struct serial_ops pipe_ops =
216 ser_base_flush_output,
217 ser_base_flush_input,
220 ser_base_get_tty_state,
221 ser_base_copy_tty_state,
222 ser_base_set_tty_state,
223 ser_base_print_tty_state,
224 ser_base_noflush_set_tty_state,
225 ser_base_setbaudrate,
226 ser_base_setstopbits,
228 ser_base_drain_output,
235 _initialize_ser_pipe (void)
237 serial_add_interface (&pipe_ops);