Commit | Line | Data |
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daf3f280 JM |
1 | /* Serial interface for a pipe to a separate program |
2 | Copyright 1999 Free Software Foundation, Inc. | |
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 | |
10 | the Free Software Foundation; either version 2 of the License, or | |
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 | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | Boston, MA 02111-1307, USA. */ | |
22 | ||
23 | #include "defs.h" | |
24 | #include "serial.h" | |
c2c6d25f JM |
25 | #include "ser-unix.h" |
26 | ||
daf3f280 | 27 | #include <sys/types.h> |
96baa820 | 28 | #ifdef HAVE_SYS_WAIT_H |
daf3f280 | 29 | #include <sys/wait.h> |
96baa820 | 30 | #endif |
daf3f280 JM |
31 | #include <sys/socket.h> |
32 | #include <sys/time.h> | |
33 | #include <fcntl.h> | |
c2d11a7d | 34 | #include <string.h> |
daf3f280 JM |
35 | |
36 | #include "signals.h" | |
daf3f280 | 37 | |
c2c6d25f JM |
38 | static int pipe_open (serial_t scb, const char *name); |
39 | static void pipe_close (serial_t scb); | |
adf40b2e | 40 | |
c2c6d25f | 41 | extern void _initialize_ser_pipe (void); |
adf40b2e JM |
42 | |
43 | struct pipe_state | |
44 | { | |
45 | int pid; | |
46 | }; | |
47 | ||
daf3f280 JM |
48 | /* Open up a raw pipe */ |
49 | ||
50 | static int | |
c2c6d25f | 51 | pipe_open (serial_t scb, const char *name) |
daf3f280 | 52 | { |
2acceee2 | 53 | #if !HAVE_SOCKETPAIR |
daf3f280 JM |
54 | return -1; |
55 | #else | |
adf40b2e | 56 | struct pipe_state *state; |
daf3f280 | 57 | /* This chunk: */ |
daf3f280 JM |
58 | /* Copyright (c) 1988, 1993 |
59 | * The Regents of the University of California. All rights reserved. | |
60 | * | |
61 | * This code is derived from software written by Ken Arnold and | |
62 | * published in UNIX Review, Vol. 6, No. 8. | |
63 | */ | |
64 | int pdes[2]; | |
65 | int pid; | |
66 | if (socketpair (AF_UNIX, SOCK_STREAM, 0, pdes) < 0) | |
67 | return -1; | |
68 | ||
adf40b2e JM |
69 | pid = vfork (); |
70 | ||
71 | /* Error. */ | |
72 | if (pid == -1) | |
daf3f280 | 73 | { |
daf3f280 JM |
74 | close (pdes[0]); |
75 | close (pdes[1]); | |
76 | return -1; | |
adf40b2e JM |
77 | } |
78 | ||
79 | /* Child. */ | |
80 | if (pid == 0) | |
81 | { | |
82 | /* re-wire pdes[1] to stdin/stdout */ | |
daf3f280 JM |
83 | close (pdes[0]); |
84 | if (pdes[1] != STDOUT_FILENO) | |
85 | { | |
86 | dup2 (pdes[1], STDOUT_FILENO); | |
87 | close (pdes[1]); | |
88 | } | |
89 | dup2 (STDOUT_FILENO, STDIN_FILENO); | |
adf40b2e JM |
90 | #if 0 |
91 | /* close any stray FD's - FIXME - how? */ | |
92 | /* POSIX.2 B.3.2.2 "popen() shall ensure that any streams | |
93 | from previous popen() calls that remain open in the | |
94 | parent process are closed in the new child process. */ | |
95 | for (old = pidlist; old; old = old->next) | |
96 | close (fileno (old->fp)); /* don't allow a flush */ | |
97 | #endif | |
c2c6d25f | 98 | execl ("/bin/sh", "sh", "-c", name, NULL); |
daf3f280 JM |
99 | _exit (127); |
100 | } | |
101 | ||
adf40b2e | 102 | /* Parent. */ |
daf3f280 | 103 | close (pdes[1]); |
adf40b2e JM |
104 | /* :end chunk */ |
105 | state = XMALLOC (struct pipe_state); | |
106 | state->pid = pid; | |
daf3f280 | 107 | scb->fd = pdes[0]; |
adf40b2e | 108 | scb->state = state; |
daf3f280 | 109 | |
daf3f280 JM |
110 | /* If we don't do this, GDB simply exits when the remote side dies. */ |
111 | signal (SIGPIPE, SIG_IGN); | |
112 | return 0; | |
113 | #endif | |
114 | } | |
115 | ||
daf3f280 | 116 | static void |
c2c6d25f | 117 | pipe_close (serial_t scb) |
daf3f280 | 118 | { |
adf40b2e JM |
119 | struct pipe_state *state = scb->state; |
120 | if (state != NULL) | |
121 | { | |
122 | int pid = state->pid; | |
123 | close (scb->fd); | |
124 | scb->fd = -1; | |
125 | free (state); | |
126 | scb->state = NULL; | |
127 | kill (pid, SIGTERM); | |
128 | /* Might be useful to check that the child does die. */ | |
129 | } | |
daf3f280 JM |
130 | } |
131 | ||
c2c6d25f | 132 | static struct serial_ops pipe_ops; |
daf3f280 JM |
133 | |
134 | void | |
c2c6d25f | 135 | _initialize_ser_pipe (void) |
daf3f280 | 136 | { |
c2c6d25f JM |
137 | struct serial_ops *ops = XMALLOC (struct serial_ops); |
138 | memset (ops, sizeof (struct serial_ops), 0); | |
139 | ops->name = "pipe"; | |
140 | ops->next = 0; | |
141 | ops->open = pipe_open; | |
142 | ops->close = pipe_close; | |
143 | ops->readchar = ser_unix_readchar; | |
144 | ops->write = ser_unix_write; | |
145 | ops->flush_output = ser_unix_nop_flush_output; | |
2acceee2 | 146 | ops->flush_input = ser_unix_flush_input; |
c2c6d25f JM |
147 | ops->send_break = ser_unix_nop_send_break; |
148 | ops->go_raw = ser_unix_nop_raw; | |
149 | ops->get_tty_state = ser_unix_nop_get_tty_state; | |
150 | ops->set_tty_state = ser_unix_nop_set_tty_state; | |
151 | ops->print_tty_state = ser_unix_nop_print_tty_state; | |
152 | ops->noflush_set_tty_state = ser_unix_nop_noflush_set_tty_state; | |
153 | ops->setbaudrate = ser_unix_nop_setbaudrate; | |
154 | ops->setstopbits = ser_unix_nop_setstopbits; | |
155 | ops->drain_output = ser_unix_nop_drain_output; | |
156 | ops->async = ser_unix_async; | |
157 | serial_add_interface (ops); | |
daf3f280 | 158 | } |