1 /* Serial interface for a pipe to a separate program
2 Copyright (C) 1999, 2000, 2001, 2007, 2008, 2009
3 Free Software Foundation, Inc.
5 Contributed by Cygnus Solutions.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
27 #include "gdb_vfork.h"
29 #include <sys/types.h>
30 #include <sys/socket.h>
33 #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.
66 if (socketpair (AF_UNIX, SOCK_STREAM, 0, pdes) < 0)
68 if (socketpair (AF_UNIX, SOCK_STREAM, 0, err_pdes) < 0)
71 /* Create the child process to run the command in. Note that the
72 apparent call to vfork() below *might* actually be a call to
73 fork() due to the fact that autoconf will ``#define vfork fork''
74 on certain platforms. */
87 if (fcntl (err_pdes[0], F_SETFL, O_NONBLOCK) == -1)
91 err_pdes[0] = err_pdes[1] = -1;
97 /* re-wire pdes[1] to stdin/stdout */
99 if (pdes[1] != STDOUT_FILENO)
101 dup2 (pdes[1], STDOUT_FILENO);
104 dup2 (STDOUT_FILENO, STDIN_FILENO);
106 if (err_pdes[0] != -1)
109 dup2 (err_pdes[1], STDERR_FILENO);
113 /* close any stray FD's - FIXME - how? */
114 /* POSIX.2 B.3.2.2 "popen() shall ensure that any streams
115 from previous popen() calls that remain open in the
116 parent process are closed in the new child process. */
117 for (old = pidlist; old; old = old->next)
118 close (fileno (old->fp)); /* don't allow a flush */
120 execl ("/bin/sh", "sh", "-c", name, (char *) 0);
127 state = XMALLOC (struct pipe_state);
130 scb->error_fd = err_pdes[0];
133 /* If we don't do this, GDB simply exits when the remote side dies. */
134 signal (SIGPIPE, SIG_IGN);
140 pipe_close (struct serial *scb)
142 struct pipe_state *state = scb->state;
145 int pid = state->pid;
151 /* Might be useful to check that the child does die. */
155 static struct serial_ops pipe_ops;
158 _initialize_ser_pipe (void)
160 struct serial_ops *ops = XMALLOC (struct serial_ops);
161 memset (ops, 0, sizeof (struct serial_ops));
164 ops->open = pipe_open;
165 ops->close = pipe_close;
166 ops->readchar = ser_base_readchar;
167 ops->write = ser_base_write;
168 ops->flush_output = ser_base_flush_output;
169 ops->flush_input = ser_base_flush_input;
170 ops->send_break = ser_base_send_break;
171 ops->go_raw = ser_base_raw;
172 ops->get_tty_state = ser_base_get_tty_state;
173 ops->set_tty_state = ser_base_set_tty_state;
174 ops->print_tty_state = ser_base_print_tty_state;
175 ops->noflush_set_tty_state = ser_base_noflush_set_tty_state;
176 ops->setbaudrate = ser_base_setbaudrate;
177 ops->setstopbits = ser_base_setstopbits;
178 ops->drain_output = ser_base_drain_output;
179 ops->async = ser_base_async;
180 ops->read_prim = ser_unix_read_prim;
181 ops->write_prim = ser_unix_write_prim;
182 serial_add_interface (ops);