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"
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 (socketpair (AF_UNIX
, SOCK_STREAM
, 0, pdes
) < 0)
68 if (socketpair (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
);
126 /* close any stray FD's - FIXME - how? */
127 /* POSIX.2 B.3.2.2 "popen() shall ensure that any streams
128 from previous popen() calls that remain open in the
129 parent process are closed in the new child process. */
130 for (old
= pidlist
; old
; old
= old
->next
)
131 close (fileno (old
->fp
)); /* Don't allow a flush. */
133 execl ("/bin/sh", "sh", "-c", name
, (char *) 0);
139 if (err_pdes
[1] != -1)
142 state
= XMALLOC (struct pipe_state
);
145 scb
->error_fd
= err_pdes
[0];
148 /* If we don't do this, GDB simply exits when the remote side dies. */
149 signal (SIGPIPE
, SIG_IGN
);
155 pipe_close (struct serial
*scb
)
157 struct pipe_state
*state
= scb
->state
;
164 int wait_result
, status
;
166 /* Don't kill the task right away, give it a chance to shut down cleanly.
167 But don't wait forever though. */
168 #define PIPE_CLOSE_TIMEOUT 5
170 /* Assume the program will exit after SIGTERM. Might be
171 useful to print any remaining stderr output from
172 scb->error_fd while waiting. */
173 #define SIGTERM_TIMEOUT INT_MAX
177 wait_result
= wait_to_die_with_timeout (state
->pid
, &status
,
180 if (wait_result
== -1)
182 kill (state
->pid
, SIGTERM
);
184 wait_to_die_with_timeout (state
->pid
, &status
, SIGTERM_TIMEOUT
);
188 if (scb
->error_fd
!= -1)
189 close (scb
->error_fd
);
197 gdb_pipe (int pdes
[2])
204 if (socketpair (AF_UNIX
, SOCK_STREAM
, 0, pdes
) < 0)
207 /* If we don't do this, GDB simply exits when the remote side
209 signal (SIGPIPE
, SIG_IGN
);
215 _initialize_ser_pipe (void)
217 struct serial_ops
*ops
= XMALLOC (struct serial_ops
);
219 memset (ops
, 0, sizeof (struct serial_ops
));
222 ops
->open
= pipe_open
;
223 ops
->close
= pipe_close
;
224 ops
->readchar
= ser_base_readchar
;
225 ops
->write
= ser_base_write
;
226 ops
->flush_output
= ser_base_flush_output
;
227 ops
->flush_input
= ser_base_flush_input
;
228 ops
->send_break
= ser_base_send_break
;
229 ops
->go_raw
= ser_base_raw
;
230 ops
->get_tty_state
= ser_base_get_tty_state
;
231 ops
->copy_tty_state
= ser_base_copy_tty_state
;
232 ops
->set_tty_state
= ser_base_set_tty_state
;
233 ops
->print_tty_state
= ser_base_print_tty_state
;
234 ops
->noflush_set_tty_state
= ser_base_noflush_set_tty_state
;
235 ops
->setbaudrate
= ser_base_setbaudrate
;
236 ops
->setstopbits
= ser_base_setstopbits
;
237 ops
->drain_output
= ser_base_drain_output
;
238 ops
->async
= ser_base_async
;
239 ops
->read_prim
= ser_unix_read_prim
;
240 ops
->write_prim
= ser_unix_write_prim
;
241 serial_add_interface (ops
);