1 /* timeout.c - Run command line with a timeout
2 *
3 * Copyright 2013 Rob Landley <rob@landley.net>
4 *
5 * No standard
6
7 USE_TIMEOUT(NEWTOY(timeout, "<2^(foreground)(preserve-status)vk:s(signal):", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_ARGFAIL(125)))
8
9 config TIMEOUT
10 bool "timeout"
11 default y
12 help
13 usage: timeout [-k DURATION] [-s SIGNAL] DURATION COMMAND...
14
15 Run command line as a child process, sending child a signal if the
16 command doesn't exit soon enough.
17
18 DURATION can be a decimal fraction. An optional suffix can be "m"
19 (minutes), "h" (hours), "d" (days), or "s" (seconds, the default).
20
21 -s Send specified signal (default TERM)
22 -k Send KILL signal if child still running this long after first signal
23 -v Verbose
24 --foreground Don't create new process group
25 --preserve-status Exit with the child's exit status
26 */
27
28 #define FOR_timeout
29 #include "toys.h"
30
31 GLOBALS(
32 char *s, *k;
33
34 int nextsig;
35 pid_t pid;
36 struct timeval ktv;
37 struct itimerval itv;
38 )
39
handler(int i)40 static void handler(int i)
41 {
42 if (FLAG(v))
43 fprintf(stderr, "timeout pid %d signal %d\n", TT.pid, TT.nextsig);
44
45 toys.exitval = (TT.nextsig==9) ? 137 : 124;
46 kill(TT.pid, TT.nextsig);
47 if (TT.k) {
48 TT.k = 0;
49 TT.nextsig = SIGKILL;
50 xsignal(SIGALRM, handler);
51 TT.itv.it_value = TT.ktv;
52 setitimer(ITIMER_REAL, &TT.itv, (void *)toybuf);
53 }
54 }
55
56 // timeval inexplicably makes up a new type for microseconds, despite timespec's
57 // nanoseconds field (needing to store 1000* the range) using "long". Bravo.
xparsetimeval(char * s,struct timeval * tv)58 static void xparsetimeval(char *s, struct timeval *tv)
59 {
60 long ll;
61
62 tv->tv_sec = xparsetime(s, 6, &ll);
63 tv->tv_usec = ll;
64 }
65
timeout_main(void)66 void timeout_main(void)
67 {
68 // Use same ARGFAIL value for any remaining parsing errors
69 toys.exitval = 125;
70 xparsetimeval(*toys.optargs, &TT.itv.it_value);
71 if (TT.k) xparsetimeval(TT.k, &TT.ktv);
72
73 TT.nextsig = SIGTERM;
74 if (TT.s && -1 == (TT.nextsig = sig_to_num(TT.s)))
75 error_exit("bad -s: '%s'", TT.s);
76
77 if (!FLAG(foreground)) setpgid(0, 0);
78
79 toys.exitval = 0;
80 if (!(TT.pid = XVFORK())) xexec(toys.optargs+1);
81 else {
82 int status;
83
84 xsignal(SIGALRM, handler);
85 setitimer(ITIMER_REAL, &TT.itv, (void *)toybuf);
86
87 status = xwaitpid(TT.pid);
88 if (FLAG(preserve_status) || !toys.exitval) toys.exitval = status;
89 }
90 }
91