1 /* Serial interface for a pipe to a separate program
2 Copyright (C) 1999, 2000, 2001, 2007 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 2 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, write to the Free Software
20 Foundation, Inc., 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA. */
28 #include "gdb_vfork.h"
30 #include <sys/types.h>
31 #include <sys/socket.h>
34 #include "gdb_string.h"
38 static int pipe_open (struct serial *scb, const char *name);
39 static void pipe_close (struct serial *scb);
41 extern void _initialize_ser_pipe (void);
48 /* Open up a raw pipe */
51 pipe_open (struct serial *scb, const char *name)
56 struct pipe_state *state;
58 /* Copyright (c) 1988, 1993
59 * The Regents of the University of California. All rights reserved.
61 * This code is derived from software written by Ken Arnold and
62 * 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)
72 /* Create the child process to run the command in. Note that the
73 apparent call to vfork() below *might* actually be a call to
74 fork() due to the fact that autoconf will ``#define vfork fork''
75 on certain platforms. */
88 if (fcntl (err_pdes[0], F_SETFL, O_NONBLOCK) == -1)
92 err_pdes[0] = err_pdes[1] = -1;
98 /* re-wire pdes[1] to stdin/stdout */
100 if (pdes[1] != STDOUT_FILENO)
102 dup2 (pdes[1], STDOUT_FILENO);
105 dup2 (STDOUT_FILENO, STDIN_FILENO);
107 if (err_pdes[0] != -1)
110 dup2 (err_pdes[1], STDERR_FILENO);
114 /* close any stray FD's - FIXME - how? */
115 /* POSIX.2 B.3.2.2 "popen() shall ensure that any streams
116 from previous popen() calls that remain open in the
117 parent process are closed in the new child process. */
118 for (old = pidlist; old; old = old->next)
119 close (fileno (old->fp)); /* don't allow a flush */
121 execl ("/bin/sh", "sh", "-c", name, (char *) 0);
128 state = XMALLOC (struct pipe_state);
131 scb->error_fd = err_pdes[0];
134 /* If we don't do this, GDB simply exits when the remote side dies. */
135 signal (SIGPIPE, SIG_IGN);
141 pipe_close (struct serial *scb)
143 struct pipe_state *state = scb->state;
146 int pid = state->pid;
152 /* Might be useful to check that the child does die. */
156 static struct serial_ops pipe_ops;
159 _initialize_ser_pipe (void)
161 struct serial_ops *ops = XMALLOC (struct serial_ops);
162 memset (ops, 0, sizeof (struct serial_ops));
165 ops->open = pipe_open;
166 ops->close = pipe_close;
167 ops->readchar = ser_base_readchar;
168 ops->write = ser_base_write;
169 ops->flush_output = ser_base_flush_output;
170 ops->flush_input = ser_base_flush_input;
171 ops->send_break = ser_base_send_break;
172 ops->go_raw = ser_base_raw;
173 ops->get_tty_state = ser_base_get_tty_state;
174 ops->set_tty_state = ser_base_set_tty_state;
175 ops->print_tty_state = ser_base_print_tty_state;
176 ops->noflush_set_tty_state = ser_base_noflush_set_tty_state;
177 ops->setbaudrate = ser_base_setbaudrate;
178 ops->setstopbits = ser_base_setstopbits;
179 ops->drain_output = ser_base_drain_output;
180 ops->async = ser_base_async;
181 ops->read_prim = ser_unix_read_prim;
182 ops->write_prim = ser_unix_write_prim;
183 serial_add_interface (ops);