Commit | Line | Data |
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daf3f280 | 1 | /* Serial interface for a pipe to a separate program |
32d0add0 | 2 | Copyright (C) 1999-2015 Free Software Foundation, Inc. |
daf3f280 JM |
3 | |
4 | Contributed by Cygnus Solutions. | |
5 | ||
6 | This file is part of GDB. | |
7 | ||
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 | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
daf3f280 JM |
11 | (at your option) any later version. |
12 | ||
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. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
daf3f280 JM |
20 | |
21 | #include "defs.h" | |
22 | #include "serial.h" | |
3eb25fda | 23 | #include "ser-base.h" |
c2c6d25f JM |
24 | #include "ser-unix.h" |
25 | ||
74c1b268 AC |
26 | #include "gdb_vfork.h" |
27 | ||
daf3f280 | 28 | #include <sys/types.h> |
daf3f280 JM |
29 | #include <sys/socket.h> |
30 | #include <sys/time.h> | |
31 | #include <fcntl.h> | |
614c279d | 32 | #include "filestuff.h" |
daf3f280 | 33 | |
042be3a9 | 34 | #include <signal.h> |
daf3f280 | 35 | |
819cc324 AC |
36 | static int pipe_open (struct serial *scb, const char *name); |
37 | static void pipe_close (struct serial *scb); | |
adf40b2e | 38 | |
c2c6d25f | 39 | extern void _initialize_ser_pipe (void); |
adf40b2e JM |
40 | |
41 | struct pipe_state | |
42 | { | |
43 | int pid; | |
44 | }; | |
45 | ||
c378eb4e | 46 | /* Open up a raw pipe. */ |
daf3f280 JM |
47 | |
48 | static int | |
819cc324 | 49 | pipe_open (struct serial *scb, const char *name) |
daf3f280 | 50 | { |
2acceee2 | 51 | #if !HAVE_SOCKETPAIR |
daf3f280 JM |
52 | return -1; |
53 | #else | |
adf40b2e | 54 | struct pipe_state *state; |
daf3f280 | 55 | /* This chunk: */ |
daf3f280 JM |
56 | /* Copyright (c) 1988, 1993 |
57 | * The Regents of the University of California. All rights reserved. | |
58 | * | |
59 | * This code is derived from software written by Ken Arnold and | |
60 | * published in UNIX Review, Vol. 6, No. 8. | |
61 | */ | |
62 | int pdes[2]; | |
65cc4390 | 63 | int err_pdes[2]; |
daf3f280 | 64 | int pid; |
433759f7 | 65 | |
614c279d | 66 | if (gdb_socketpair_cloexec (AF_UNIX, SOCK_STREAM, 0, pdes) < 0) |
daf3f280 | 67 | return -1; |
614c279d | 68 | if (gdb_socketpair_cloexec (AF_UNIX, SOCK_STREAM, 0, err_pdes) < 0) |
ff9f22f1 DE |
69 | { |
70 | close (pdes[0]); | |
71 | close (pdes[1]); | |
72 | return -1; | |
73 | } | |
daf3f280 | 74 | |
7700434b KB |
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. */ | |
adf40b2e JM |
79 | pid = vfork (); |
80 | ||
c378eb4e | 81 | /* Error. */ |
adf40b2e | 82 | if (pid == -1) |
daf3f280 | 83 | { |
daf3f280 JM |
84 | close (pdes[0]); |
85 | close (pdes[1]); | |
65cc4390 VP |
86 | close (err_pdes[0]); |
87 | close (err_pdes[1]); | |
daf3f280 | 88 | return -1; |
adf40b2e JM |
89 | } |
90 | ||
65cc4390 VP |
91 | if (fcntl (err_pdes[0], F_SETFL, O_NONBLOCK) == -1) |
92 | { | |
93 | close (err_pdes[0]); | |
94 | close (err_pdes[1]); | |
95 | err_pdes[0] = err_pdes[1] = -1; | |
96 | } | |
97 | ||
c378eb4e | 98 | /* Child. */ |
adf40b2e JM |
99 | if (pid == 0) |
100 | { | |
e34838f0 DE |
101 | /* We don't want ^c to kill the connection. */ |
102 | #ifdef HAVE_SETSID | |
103 | pid_t sid = setsid (); | |
104 | if (sid == -1) | |
105 | signal (SIGINT, SIG_IGN); | |
106 | #else | |
107 | signal (SIGINT, SIG_IGN); | |
108 | #endif | |
109 | ||
c378eb4e | 110 | /* Re-wire pdes[1] to stdin/stdout. */ |
daf3f280 JM |
111 | close (pdes[0]); |
112 | if (pdes[1] != STDOUT_FILENO) | |
113 | { | |
114 | dup2 (pdes[1], STDOUT_FILENO); | |
115 | close (pdes[1]); | |
116 | } | |
117 | dup2 (STDOUT_FILENO, STDIN_FILENO); | |
65cc4390 VP |
118 | |
119 | if (err_pdes[0] != -1) | |
120 | { | |
121 | close (err_pdes[0]); | |
122 | dup2 (err_pdes[1], STDERR_FILENO); | |
123 | close (err_pdes[1]); | |
124 | } | |
614c279d TT |
125 | |
126 | close_most_fds (); | |
36662fde | 127 | execl ("/bin/sh", "sh", "-c", name, (char *) 0); |
daf3f280 JM |
128 | _exit (127); |
129 | } | |
130 | ||
c378eb4e | 131 | /* Parent. */ |
daf3f280 | 132 | close (pdes[1]); |
ff9f22f1 DE |
133 | if (err_pdes[1] != -1) |
134 | close (err_pdes[1]); | |
adf40b2e | 135 | /* :end chunk */ |
70ba0933 | 136 | state = XNEW (struct pipe_state); |
adf40b2e | 137 | state->pid = pid; |
daf3f280 | 138 | scb->fd = pdes[0]; |
65cc4390 | 139 | scb->error_fd = err_pdes[0]; |
adf40b2e | 140 | scb->state = state; |
daf3f280 | 141 | |
daf3f280 JM |
142 | /* If we don't do this, GDB simply exits when the remote side dies. */ |
143 | signal (SIGPIPE, SIG_IGN); | |
144 | return 0; | |
145 | #endif | |
146 | } | |
147 | ||
daf3f280 | 148 | static void |
819cc324 | 149 | pipe_close (struct serial *scb) |
daf3f280 | 150 | { |
adf40b2e | 151 | struct pipe_state *state = scb->state; |
433759f7 | 152 | |
58f07bae PA |
153 | close (scb->fd); |
154 | scb->fd = -1; | |
155 | ||
adf40b2e JM |
156 | if (state != NULL) |
157 | { | |
0b6cb71e DE |
158 | int wait_result, status; |
159 | ||
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 | |
163 | ||
0a4f61e3 DJ |
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. */ | |
0b6cb71e DE |
167 | #define SIGTERM_TIMEOUT INT_MAX |
168 | ||
169 | wait_result = -1; | |
170 | #ifdef HAVE_WAITPID | |
171 | wait_result = wait_to_die_with_timeout (state->pid, &status, | |
172 | PIPE_CLOSE_TIMEOUT); | |
0a4f61e3 | 173 | #endif |
0b6cb71e DE |
174 | if (wait_result == -1) |
175 | { | |
176 | kill (state->pid, SIGTERM); | |
177 | #ifdef HAVE_WAITPID | |
178 | wait_to_die_with_timeout (state->pid, &status, SIGTERM_TIMEOUT); | |
179 | #endif | |
180 | } | |
181 | ||
ff9f22f1 DE |
182 | if (scb->error_fd != -1) |
183 | close (scb->error_fd); | |
184 | scb->error_fd = -1; | |
b8c9b27d | 185 | xfree (state); |
adf40b2e | 186 | scb->state = NULL; |
adf40b2e | 187 | } |
daf3f280 JM |
188 | } |
189 | ||
58f07bae PA |
190 | int |
191 | gdb_pipe (int pdes[2]) | |
192 | { | |
193 | #if !HAVE_SOCKETPAIR | |
194 | errno = ENOSYS; | |
195 | return -1; | |
196 | #else | |
197 | ||
614c279d | 198 | if (gdb_socketpair_cloexec (AF_UNIX, SOCK_STREAM, 0, pdes) < 0) |
58f07bae PA |
199 | return -1; |
200 | ||
201 | /* If we don't do this, GDB simply exits when the remote side | |
202 | dies. */ | |
203 | signal (SIGPIPE, SIG_IGN); | |
204 | return 0; | |
205 | #endif | |
206 | } | |
207 | ||
12e8c7d7 TT |
208 | static const struct serial_ops pipe_ops = |
209 | { | |
210 | "pipe", | |
211 | pipe_open, | |
212 | pipe_close, | |
213 | NULL, | |
214 | ser_base_readchar, | |
215 | ser_base_write, | |
216 | ser_base_flush_output, | |
217 | ser_base_flush_input, | |
218 | ser_base_send_break, | |
219 | ser_base_raw, | |
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, | |
236af5e3 | 227 | ser_base_setparity, |
12e8c7d7 TT |
228 | ser_base_drain_output, |
229 | ser_base_async, | |
230 | ser_unix_read_prim, | |
231 | ser_unix_write_prim | |
232 | }; | |
233 | ||
daf3f280 | 234 | void |
c2c6d25f | 235 | _initialize_ser_pipe (void) |
daf3f280 | 236 | { |
12e8c7d7 | 237 | serial_add_interface (&pipe_ops); |
daf3f280 | 238 | } |