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daf3f280 | 1 | /* Serial interface for a pipe to a separate program |
213516ef | 2 | Copyright (C) 1999-2023 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 | 29 | #include <sys/socket.h> |
268a13a5 | 30 | #include "gdbsupport/gdb_sys_time.h" |
daf3f280 | 31 | #include <fcntl.h> |
268a13a5 | 32 | #include "gdbsupport/filestuff.h" |
906e2b76 | 33 | #include "gdbsupport/pathstuff.h" |
daf3f280 | 34 | |
042be3a9 | 35 | #include <signal.h> |
daf3f280 | 36 | |
819cc324 AC |
37 | static int pipe_open (struct serial *scb, const char *name); |
38 | static void pipe_close (struct serial *scb); | |
adf40b2e | 39 | |
adf40b2e JM |
40 | struct pipe_state |
41 | { | |
42 | int pid; | |
43 | }; | |
44 | ||
c378eb4e | 45 | /* Open up a raw pipe. */ |
daf3f280 JM |
46 | |
47 | static int | |
819cc324 | 48 | pipe_open (struct serial *scb, const char *name) |
daf3f280 | 49 | { |
2acceee2 | 50 | #if !HAVE_SOCKETPAIR |
daf3f280 JM |
51 | return -1; |
52 | #else | |
adf40b2e | 53 | struct pipe_state *state; |
daf3f280 | 54 | /* This chunk: */ |
daf3f280 JM |
55 | /* Copyright (c) 1988, 1993 |
56 | * The Regents of the University of California. All rights reserved. | |
57 | * | |
58 | * This code is derived from software written by Ken Arnold and | |
59 | * published in UNIX Review, Vol. 6, No. 8. | |
60 | */ | |
61 | int pdes[2]; | |
65cc4390 | 62 | int err_pdes[2]; |
daf3f280 | 63 | int pid; |
433759f7 | 64 | |
cced7cac AB |
65 | if (*name == '|') |
66 | { | |
67 | name++; | |
68 | name = skip_spaces (name); | |
69 | } | |
70 | ||
614c279d | 71 | if (gdb_socketpair_cloexec (AF_UNIX, SOCK_STREAM, 0, pdes) < 0) |
daf3f280 | 72 | return -1; |
614c279d | 73 | if (gdb_socketpair_cloexec (AF_UNIX, SOCK_STREAM, 0, err_pdes) < 0) |
ff9f22f1 DE |
74 | { |
75 | close (pdes[0]); | |
76 | close (pdes[1]); | |
77 | return -1; | |
78 | } | |
daf3f280 | 79 | |
7700434b KB |
80 | /* Create the child process to run the command in. Note that the |
81 | apparent call to vfork() below *might* actually be a call to | |
82 | fork() due to the fact that autoconf will ``#define vfork fork'' | |
83 | on certain platforms. */ | |
adf40b2e JM |
84 | pid = vfork (); |
85 | ||
c378eb4e | 86 | /* Error. */ |
adf40b2e | 87 | if (pid == -1) |
daf3f280 | 88 | { |
daf3f280 JM |
89 | close (pdes[0]); |
90 | close (pdes[1]); | |
65cc4390 VP |
91 | close (err_pdes[0]); |
92 | close (err_pdes[1]); | |
daf3f280 | 93 | return -1; |
adf40b2e JM |
94 | } |
95 | ||
65cc4390 VP |
96 | if (fcntl (err_pdes[0], F_SETFL, O_NONBLOCK) == -1) |
97 | { | |
98 | close (err_pdes[0]); | |
99 | close (err_pdes[1]); | |
100 | err_pdes[0] = err_pdes[1] = -1; | |
101 | } | |
102 | ||
c378eb4e | 103 | /* Child. */ |
adf40b2e JM |
104 | if (pid == 0) |
105 | { | |
e34838f0 DE |
106 | /* We don't want ^c to kill the connection. */ |
107 | #ifdef HAVE_SETSID | |
108 | pid_t sid = setsid (); | |
109 | if (sid == -1) | |
110 | signal (SIGINT, SIG_IGN); | |
111 | #else | |
112 | signal (SIGINT, SIG_IGN); | |
113 | #endif | |
114 | ||
c378eb4e | 115 | /* Re-wire pdes[1] to stdin/stdout. */ |
daf3f280 JM |
116 | close (pdes[0]); |
117 | if (pdes[1] != STDOUT_FILENO) | |
118 | { | |
119 | dup2 (pdes[1], STDOUT_FILENO); | |
120 | close (pdes[1]); | |
121 | } | |
122 | dup2 (STDOUT_FILENO, STDIN_FILENO); | |
65cc4390 VP |
123 | |
124 | if (err_pdes[0] != -1) | |
125 | { | |
126 | close (err_pdes[0]); | |
127 | dup2 (err_pdes[1], STDERR_FILENO); | |
128 | close (err_pdes[1]); | |
129 | } | |
614c279d TT |
130 | |
131 | close_most_fds (); | |
906e2b76 SDJ |
132 | |
133 | const char *shellfile = get_shell (); | |
134 | execl (shellfile, shellfile, "-c", name, (char *) 0); | |
daf3f280 JM |
135 | _exit (127); |
136 | } | |
137 | ||
c378eb4e | 138 | /* Parent. */ |
daf3f280 | 139 | close (pdes[1]); |
ff9f22f1 DE |
140 | if (err_pdes[1] != -1) |
141 | close (err_pdes[1]); | |
adf40b2e | 142 | /* :end chunk */ |
70ba0933 | 143 | state = XNEW (struct pipe_state); |
adf40b2e | 144 | state->pid = pid; |
daf3f280 | 145 | scb->fd = pdes[0]; |
65cc4390 | 146 | scb->error_fd = err_pdes[0]; |
adf40b2e | 147 | scb->state = state; |
daf3f280 | 148 | |
daf3f280 JM |
149 | /* If we don't do this, GDB simply exits when the remote side dies. */ |
150 | signal (SIGPIPE, SIG_IGN); | |
151 | return 0; | |
152 | #endif | |
153 | } | |
154 | ||
daf3f280 | 155 | static void |
819cc324 | 156 | pipe_close (struct serial *scb) |
daf3f280 | 157 | { |
19ba03f4 | 158 | struct pipe_state *state = (struct pipe_state *) scb->state; |
433759f7 | 159 | |
58f07bae PA |
160 | close (scb->fd); |
161 | scb->fd = -1; | |
162 | ||
adf40b2e JM |
163 | if (state != NULL) |
164 | { | |
0b6cb71e DE |
165 | int wait_result, status; |
166 | ||
167 | /* Don't kill the task right away, give it a chance to shut down cleanly. | |
168 | But don't wait forever though. */ | |
169 | #define PIPE_CLOSE_TIMEOUT 5 | |
170 | ||
0a4f61e3 DJ |
171 | /* Assume the program will exit after SIGTERM. Might be |
172 | useful to print any remaining stderr output from | |
173 | scb->error_fd while waiting. */ | |
0b6cb71e DE |
174 | #define SIGTERM_TIMEOUT INT_MAX |
175 | ||
176 | wait_result = -1; | |
177 | #ifdef HAVE_WAITPID | |
178 | wait_result = wait_to_die_with_timeout (state->pid, &status, | |
179 | PIPE_CLOSE_TIMEOUT); | |
0a4f61e3 | 180 | #endif |
0b6cb71e DE |
181 | if (wait_result == -1) |
182 | { | |
183 | kill (state->pid, SIGTERM); | |
184 | #ifdef HAVE_WAITPID | |
185 | wait_to_die_with_timeout (state->pid, &status, SIGTERM_TIMEOUT); | |
186 | #endif | |
187 | } | |
188 | ||
ff9f22f1 DE |
189 | if (scb->error_fd != -1) |
190 | close (scb->error_fd); | |
191 | scb->error_fd = -1; | |
b8c9b27d | 192 | xfree (state); |
adf40b2e | 193 | scb->state = NULL; |
adf40b2e | 194 | } |
daf3f280 JM |
195 | } |
196 | ||
58f07bae PA |
197 | int |
198 | gdb_pipe (int pdes[2]) | |
199 | { | |
200 | #if !HAVE_SOCKETPAIR | |
201 | errno = ENOSYS; | |
202 | return -1; | |
203 | #else | |
204 | ||
614c279d | 205 | if (gdb_socketpair_cloexec (AF_UNIX, SOCK_STREAM, 0, pdes) < 0) |
58f07bae PA |
206 | return -1; |
207 | ||
208 | /* If we don't do this, GDB simply exits when the remote side | |
209 | dies. */ | |
210 | signal (SIGPIPE, SIG_IGN); | |
211 | return 0; | |
212 | #endif | |
213 | } | |
214 | ||
12e8c7d7 TT |
215 | static const struct serial_ops pipe_ops = |
216 | { | |
217 | "pipe", | |
218 | pipe_open, | |
219 | pipe_close, | |
220 | NULL, | |
221 | ser_base_readchar, | |
222 | ser_base_write, | |
223 | ser_base_flush_output, | |
224 | ser_base_flush_input, | |
225 | ser_base_send_break, | |
226 | ser_base_raw, | |
227 | ser_base_get_tty_state, | |
228 | ser_base_copy_tty_state, | |
229 | ser_base_set_tty_state, | |
230 | ser_base_print_tty_state, | |
12e8c7d7 TT |
231 | ser_base_setbaudrate, |
232 | ser_base_setstopbits, | |
236af5e3 | 233 | ser_base_setparity, |
12e8c7d7 TT |
234 | ser_base_drain_output, |
235 | ser_base_async, | |
236 | ser_unix_read_prim, | |
237 | ser_unix_write_prim | |
238 | }; | |
239 | ||
6c265988 | 240 | void _initialize_ser_pipe (); |
daf3f280 | 241 | void |
6c265988 | 242 | _initialize_ser_pipe () |
daf3f280 | 243 | { |
12e8c7d7 | 244 | serial_add_interface (&pipe_ops); |
daf3f280 | 245 | } |