-
Notifications
You must be signed in to change notification settings - Fork 245
/
sdc-on-tty.c
170 lines (148 loc) · 3.58 KB
/
sdc-on-tty.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2012, Joyent, Inc. All rights reserved.
*/
/*
* This utility uses its parameters as a command (with options) and runs that
* command on each tty specified by the -d option(s). Each tty is setup as
* the controlling terminal for the command so that it can receive control
* characters (such as SIGINT) properly. The utility then waits for one of
* the processes to exit and terminates the remaining processes running on the
* other ttys.
*
* Example usage:
* sdc-on-tty -d /dev/console -d /dev/ttya -d /dev/ttyb config-sys foo bar
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <stropts.h>
#include <limits.h>
#define MAXDEVS 10
int
run_cmd(char *dev, char *cmd[])
{
struct stat buf;
int std_in, std_out, std_err;
int id;
if (stat(dev, &buf) < 0)
return (-1);
if ((buf.st_mode & S_IFMT) != S_IFCHR)
return (-1);
switch (id = fork()) {
case 0:
/* child */
closefrom(0);
/* Create a new session and process group */
if (setsid() < 0)
exit(1);
if ((std_in = open(dev, O_RDONLY)) < 0)
exit(1);
if ((std_out = open(dev, O_WRONLY)) < 0)
exit(1);
if ((std_err = open(dev, O_WRONLY)) < 0)
exit(1);
if (execv(cmd[0], cmd))
exit(1);
/*NOTREACHED*/
break;
case -1:
return (-1);
default:
/* parent */
return (id);
}
/*NOTREACHED*/
return (-1);
}
int
main(int argc, char **argv)
{
int arg;
int nprocs = 0, ndevs = 0;
int i;
int pid;
int stat;
pid_t procs[MAXDEVS];
char *devs[MAXDEVS];
char *args[ARG_MAX];
extern char *optarg;
extern int optind;
while ((arg = getopt(argc, argv, "d:")) != EOF) {
switch (arg) {
case 'd':
if (ndevs == MAXDEVS) {
fprintf(stderr, "too many tty devices\n");
exit(1);
}
devs[ndevs++] = optarg;
break;
default:
fprintf(stderr, "unknown option\n");
exit(1);
}
}
if (ndevs == 0) {
fprintf(stderr, "a tty device is required\n");
exit(1);
}
if (optind >= argc) {
fprintf(stderr, "missing command\n");
exit(1);
}
for (i = 0 ; optind < argc; i++, optind++)
args[i] = argv[optind];
args[i] = NULL;
for (i = 0; i < ndevs; i++) {
pid = run_cmd(devs[i], args);
if (pid != -1)
procs[nprocs++] = (pid_t)pid;
else
fprintf(stderr, "unable to run %s on %s\n",
args[0], devs[i]);
}
if (nprocs == 0) {
fprintf(stderr, "unable to run any processes\n");
exit(1);
}
signal(SIGHUP, SIG_IGN);
signal(SIGINT, SIG_IGN);
signal(SIGSTOP, SIG_IGN);
signal(SIGTSTP, SIG_IGN);
signal(SIGTTIN, SIG_IGN);
signal(SIGTTOU, SIG_IGN);
pid = wait(&stat);
for (i = 0; i < nprocs; i++) {
if (procs[i] != pid) {
(void) kill(procs[i], SIGKILL);
(void) wait(&stat);
}
}
return (0);
}