source: branches/2.2.9/mindi-busybox/miscutils/timeout.c @ 2725

Last change on this file since 2725 was 2725, checked in by Bruno Cornec, 9 years ago
  • Update mindi-busybox to 1.18.3 to avoid problems with the tar command which is now failing on recent versions with busybox 1.7.3
  • Property svn:eol-style set to native
File size: 3.4 KB
Line 
1/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
2 * COPYING NOTES
3 *
4 * timeout.c -- a timeout handler for shell commands
5 *
6 * Copyright (C) 2005-6, Roberto A. Foglietta <me@roberto.foglietta.name>
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; version 2 of the License.
11 *
12 *   This program is distributed in the hope that it will be useful,
13 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
14 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 *   GNU General Public License for more details.
16 *
17 *   You should have received a copy of the GNU General Public License
18 *   along with this program; if not, write to the Free Software
19 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
20 */
21/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
22 * REVISION NOTES:
23 * released 17-11-2005 by Roberto A. Foglietta
24 * talarm   04-12-2005 by Roberto A. Foglietta
25 * modified 05-12-2005 by Roberto A. Foglietta
26 * sizerdct 06-12-2005 by Roberto A. Foglietta
27 * splitszf 12-05-2006 by Roberto A. Foglietta
28 * rewrite  14-11-2008 vda
29 */
30
31#include "libbb.h"
32
33int timeout_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
34int timeout_main(int argc UNUSED_PARAM, char **argv)
35{
36    int signo;
37    int status;
38    int parent = 0;
39    int timeout = 10;
40    pid_t pid;
41#if !BB_MMU
42    char *sv1, *sv2;
43#endif
44    const char *opt_s = "TERM";
45
46    /* -p option is not documented, it is needed to support NOMMU. */
47
48    /* -t SECONDS; -p PARENT_PID */
49    opt_complementary = "t+" USE_FOR_NOMMU(":p+");
50    /* '+': stop at first non-option */
51    getopt32(argv, "+s:t:" USE_FOR_NOMMU("p:"), &opt_s, &timeout, &parent);
52    /*argv += optind; - no, wait for bb_daemonize_or_rexec! */
53    signo = get_signum(opt_s);
54    if (signo < 0)
55        bb_error_msg_and_die("unknown signal '%s'", opt_s);
56
57    /* We want to create a grandchild which will watch
58     * and kill the grandparent. Other methods:
59     * making parent watch child disrupts parent<->child link
60     * (example: "tcpsvd 0.0.0.0 1234 timeout service_prog" -
61     * it's better if service_prog is a child of tcpsvd!),
62     * making child watch parent results in programs having
63     * unexpected children. */
64
65    if (parent) /* we were re-execed, already grandchild */
66        goto grandchild;
67    if (!argv[optind]) /* no PROG? */
68        bb_show_usage();
69
70#if !BB_MMU
71    sv1 = argv[optind];
72    sv2 = argv[optind + 1];
73#endif
74    pid = xvfork();
75    if (pid == 0) {
76        /* Child: spawn grandchild and exit */
77        parent = getppid();
78#if !BB_MMU
79        argv[optind] = xasprintf("-p%u", parent);
80        argv[optind + 1] = NULL;
81#endif
82        /* NB: exits with nonzero on error: */
83        bb_daemonize_or_rexec(0, argv);
84        /* Here we are grandchild. Sleep, then kill grandparent */
85 grandchild:
86        /* Just sleep(NUGE_NUM); kill(parent) may kill wrong process! */
87        while (1) {
88            sleep(1);
89            if (--timeout <= 0)
90                break;
91            if (kill(parent, 0)) {
92                /* process is gone */
93                return EXIT_SUCCESS;
94            }
95        }
96        kill(parent, signo);
97        return EXIT_SUCCESS;
98    }
99
100    /* Parent */
101    wait(&status); /* wait for child to die */
102    /* Did intermediate [v]fork or exec fail? */
103    if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
104        return EXIT_FAILURE;
105    /* Ok, exec a program as requested */
106    argv += optind;
107#if !BB_MMU
108    argv[0] = sv1;
109    argv[1] = sv2;
110#endif
111    BB_EXECVP_or_die(argv);
112}
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