Commit | Line | Data |
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daf3f280 | 1 | /* Serial interface for a pipe to a separate program |
4c38e0a4 | 2 | Copyright (C) 1999, 2000, 2001, 2007, 2008, 2009, 2010 |
0fb0cc75 | 3 | Free Software Foundation, Inc. |
daf3f280 JM |
4 | |
5 | Contributed by Cygnus Solutions. | |
6 | ||
7 | This file is part of GDB. | |
8 | ||
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 | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
daf3f280 JM |
12 | (at your option) any later version. |
13 | ||
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. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
daf3f280 JM |
21 | |
22 | #include "defs.h" | |
23 | #include "serial.h" | |
3eb25fda | 24 | #include "ser-base.h" |
c2c6d25f JM |
25 | #include "ser-unix.h" |
26 | ||
74c1b268 AC |
27 | #include "gdb_vfork.h" |
28 | ||
daf3f280 | 29 | #include <sys/types.h> |
daf3f280 JM |
30 | #include <sys/socket.h> |
31 | #include <sys/time.h> | |
32 | #include <fcntl.h> | |
27b82ed2 | 33 | #include "gdb_string.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 | |
c2c6d25f | 40 | extern void _initialize_ser_pipe (void); |
adf40b2e JM |
41 | |
42 | struct pipe_state | |
43 | { | |
44 | int pid; | |
45 | }; | |
46 | ||
daf3f280 JM |
47 | /* Open up a raw pipe */ |
48 | ||
49 | static int | |
819cc324 | 50 | pipe_open (struct serial *scb, const char *name) |
daf3f280 | 51 | { |
2acceee2 | 52 | #if !HAVE_SOCKETPAIR |
daf3f280 JM |
53 | return -1; |
54 | #else | |
adf40b2e | 55 | struct pipe_state *state; |
daf3f280 | 56 | /* This chunk: */ |
daf3f280 JM |
57 | /* Copyright (c) 1988, 1993 |
58 | * The Regents of the University of California. All rights reserved. | |
59 | * | |
60 | * This code is derived from software written by Ken Arnold and | |
61 | * published in UNIX Review, Vol. 6, No. 8. | |
62 | */ | |
63 | int pdes[2]; | |
65cc4390 | 64 | int err_pdes[2]; |
daf3f280 | 65 | int pid; |
433759f7 | 66 | |
daf3f280 JM |
67 | if (socketpair (AF_UNIX, SOCK_STREAM, 0, pdes) < 0) |
68 | return -1; | |
65cc4390 | 69 | if (socketpair (AF_UNIX, SOCK_STREAM, 0, err_pdes) < 0) |
ff9f22f1 DE |
70 | { |
71 | close (pdes[0]); | |
72 | close (pdes[1]); | |
73 | return -1; | |
74 | } | |
daf3f280 | 75 | |
7700434b KB |
76 | /* Create the child process to run the command in. Note that the |
77 | apparent call to vfork() below *might* actually be a call to | |
78 | fork() due to the fact that autoconf will ``#define vfork fork'' | |
79 | on certain platforms. */ | |
adf40b2e JM |
80 | pid = vfork (); |
81 | ||
82 | /* Error. */ | |
83 | if (pid == -1) | |
daf3f280 | 84 | { |
daf3f280 JM |
85 | close (pdes[0]); |
86 | close (pdes[1]); | |
65cc4390 VP |
87 | close (err_pdes[0]); |
88 | close (err_pdes[1]); | |
daf3f280 | 89 | return -1; |
adf40b2e JM |
90 | } |
91 | ||
65cc4390 VP |
92 | if (fcntl (err_pdes[0], F_SETFL, O_NONBLOCK) == -1) |
93 | { | |
94 | close (err_pdes[0]); | |
95 | close (err_pdes[1]); | |
96 | err_pdes[0] = err_pdes[1] = -1; | |
97 | } | |
98 | ||
adf40b2e JM |
99 | /* Child. */ |
100 | if (pid == 0) | |
101 | { | |
102 | /* re-wire pdes[1] to stdin/stdout */ | |
daf3f280 JM |
103 | close (pdes[0]); |
104 | if (pdes[1] != STDOUT_FILENO) | |
105 | { | |
106 | dup2 (pdes[1], STDOUT_FILENO); | |
107 | close (pdes[1]); | |
108 | } | |
109 | dup2 (STDOUT_FILENO, STDIN_FILENO); | |
65cc4390 VP |
110 | |
111 | if (err_pdes[0] != -1) | |
112 | { | |
113 | close (err_pdes[0]); | |
114 | dup2 (err_pdes[1], STDERR_FILENO); | |
115 | close (err_pdes[1]); | |
116 | } | |
adf40b2e JM |
117 | #if 0 |
118 | /* close any stray FD's - FIXME - how? */ | |
119 | /* POSIX.2 B.3.2.2 "popen() shall ensure that any streams | |
120 | from previous popen() calls that remain open in the | |
121 | parent process are closed in the new child process. */ | |
122 | for (old = pidlist; old; old = old->next) | |
123 | close (fileno (old->fp)); /* don't allow a flush */ | |
124 | #endif | |
36662fde | 125 | execl ("/bin/sh", "sh", "-c", name, (char *) 0); |
daf3f280 JM |
126 | _exit (127); |
127 | } | |
128 | ||
adf40b2e | 129 | /* Parent. */ |
daf3f280 | 130 | close (pdes[1]); |
ff9f22f1 DE |
131 | if (err_pdes[1] != -1) |
132 | close (err_pdes[1]); | |
adf40b2e JM |
133 | /* :end chunk */ |
134 | state = XMALLOC (struct pipe_state); | |
135 | state->pid = pid; | |
daf3f280 | 136 | scb->fd = pdes[0]; |
65cc4390 | 137 | scb->error_fd = err_pdes[0]; |
adf40b2e | 138 | scb->state = state; |
daf3f280 | 139 | |
daf3f280 JM |
140 | /* If we don't do this, GDB simply exits when the remote side dies. */ |
141 | signal (SIGPIPE, SIG_IGN); | |
142 | return 0; | |
143 | #endif | |
144 | } | |
145 | ||
daf3f280 | 146 | static void |
819cc324 | 147 | pipe_close (struct serial *scb) |
daf3f280 | 148 | { |
adf40b2e | 149 | struct pipe_state *state = scb->state; |
433759f7 | 150 | |
adf40b2e JM |
151 | if (state != NULL) |
152 | { | |
153 | int pid = state->pid; | |
154 | close (scb->fd); | |
155 | scb->fd = -1; | |
ff9f22f1 DE |
156 | if (scb->error_fd != -1) |
157 | close (scb->error_fd); | |
158 | scb->error_fd = -1; | |
b8c9b27d | 159 | xfree (state); |
adf40b2e JM |
160 | scb->state = NULL; |
161 | kill (pid, SIGTERM); | |
ff9f22f1 DE |
162 | /* Might be useful to check that the child does die, |
163 | and while we're waiting for it to die print any remaining | |
164 | stderr output. */ | |
adf40b2e | 165 | } |
daf3f280 JM |
166 | } |
167 | ||
daf3f280 | 168 | void |
c2c6d25f | 169 | _initialize_ser_pipe (void) |
daf3f280 | 170 | { |
c2c6d25f | 171 | struct serial_ops *ops = XMALLOC (struct serial_ops); |
433759f7 | 172 | |
2fdbdd39 | 173 | memset (ops, 0, sizeof (struct serial_ops)); |
c2c6d25f JM |
174 | ops->name = "pipe"; |
175 | ops->next = 0; | |
176 | ops->open = pipe_open; | |
177 | ops->close = pipe_close; | |
b4505029 | 178 | ops->readchar = ser_base_readchar; |
dd5da072 MM |
179 | ops->write = ser_base_write; |
180 | ops->flush_output = ser_base_flush_output; | |
181 | ops->flush_input = ser_base_flush_input; | |
182 | ops->send_break = ser_base_send_break; | |
183 | ops->go_raw = ser_base_raw; | |
184 | ops->get_tty_state = ser_base_get_tty_state; | |
185 | ops->set_tty_state = ser_base_set_tty_state; | |
186 | ops->print_tty_state = ser_base_print_tty_state; | |
187 | ops->noflush_set_tty_state = ser_base_noflush_set_tty_state; | |
188 | ops->setbaudrate = ser_base_setbaudrate; | |
189 | ops->setstopbits = ser_base_setstopbits; | |
190 | ops->drain_output = ser_base_drain_output; | |
191 | ops->async = ser_base_async; | |
b4505029 MM |
192 | ops->read_prim = ser_unix_read_prim; |
193 | ops->write_prim = ser_unix_write_prim; | |
c2c6d25f | 194 | serial_add_interface (ops); |
daf3f280 | 195 | } |