1 /* Serial interface for a pipe to a separate program
2 Copyright (C) 1999-2001, 2007-2012 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>
32 #include "gdb_string.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 (socketpair (AF_UNIX, SOCK_STREAM, 0, pdes) < 0)
69 if (socketpair (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);
127 /* close any stray FD's - FIXME - how? */
128 /* POSIX.2 B.3.2.2 "popen() shall ensure that any streams
129 from previous popen() calls that remain open in the
130 parent process are closed in the new child process. */
131 for (old = pidlist; old; old = old->next)
132 close (fileno (old->fp)); /* Don't allow a flush. */
134 execl ("/bin/sh", "sh", "-c", name, (char *) 0);
140 if (err_pdes[1] != -1)
143 state = XMALLOC (struct pipe_state);
146 scb->error_fd = err_pdes[0];
149 /* If we don't do this, GDB simply exits when the remote side dies. */
150 signal (SIGPIPE, SIG_IGN);
156 pipe_close (struct serial *scb)
158 struct pipe_state *state = scb->state;
166 kill (state->pid, SIGTERM);
168 /* Assume the program will exit after SIGTERM. Might be
169 useful to print any remaining stderr output from
170 scb->error_fd while waiting. */
171 waitpid (state->pid, &status, 0);
173 if (scb->error_fd != -1)
174 close (scb->error_fd);
182 gdb_pipe (int pdes[2])
189 if (socketpair (AF_UNIX, SOCK_STREAM, 0, pdes) < 0)
192 /* If we don't do this, GDB simply exits when the remote side
194 signal (SIGPIPE, SIG_IGN);
200 _initialize_ser_pipe (void)
202 struct serial_ops *ops = XMALLOC (struct serial_ops);
204 memset (ops, 0, sizeof (struct serial_ops));
207 ops->open = pipe_open;
208 ops->close = pipe_close;
209 ops->readchar = ser_base_readchar;
210 ops->write = ser_base_write;
211 ops->flush_output = ser_base_flush_output;
212 ops->flush_input = ser_base_flush_input;
213 ops->send_break = ser_base_send_break;
214 ops->go_raw = ser_base_raw;
215 ops->get_tty_state = ser_base_get_tty_state;
216 ops->copy_tty_state = ser_base_copy_tty_state;
217 ops->set_tty_state = ser_base_set_tty_state;
218 ops->print_tty_state = ser_base_print_tty_state;
219 ops->noflush_set_tty_state = ser_base_noflush_set_tty_state;
220 ops->setbaudrate = ser_base_setbaudrate;
221 ops->setstopbits = ser_base_setstopbits;
222 ops->drain_output = ser_base_drain_output;
223 ops->async = ser_base_async;
224 ops->read_prim = ser_unix_read_prim;
225 ops->write_prim = ser_unix_write_prim;
226 serial_add_interface (ops);