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/* ISC license. */
#include <sys/wait.h>
#include <signal.h>
#include <errno.h>
#include <unistd.h>
#include <skalibs/sgetopt.h>
#include <skalibs/types.h>
#include <skalibs/error.h>
#include <skalibs/sig.h>
#include <skalibs/tai.h>
#include <skalibs/iopause.h>
#include <skalibs/selfpipe.h>
#include <skalibs/strerr2.h>
#include <skalibs/djbunix.h>
#define USAGE "s6-maximumtime [ -0 | -a | -b | -i | -k | -q | -t | -x | -1 | -2 ] milliseconds prog..."
int main (int argc, char const *const *argv, char const *const *envp)
{
tain deadline ;
iopause_fd x[1] = { { .fd = -1, .events = IOPAUSE_READ, .revents = 0 } } ;
pid_t pid = 0 ;
int tosend = SIGTERM ;
unsigned int timeout ;
PROG = "s6-maximumtime" ;
{
subgetopt l = SUBGETOPT_ZERO ;
for (;;)
{
int opt = subgetopt_r(argc, argv, "0abikqtx12", &l) ;
if (opt == -1) break ;
switch (opt)
{
case '0': tosend = 0 ; break ;
case 'a': tosend = SIGALRM ; break ;
case 'b': tosend = SIGABRT ; break ;
case 'i': tosend = SIGINT ; break ;
case 'k': tosend = SIGKILL ; break ;
case 'q': tosend = SIGQUIT ; break ;
case 't': tosend = SIGTERM ; break ;
case 'x': tosend = SIGXCPU ; break ;
case '1': tosend = SIGUSR1 ; break ;
case '2': tosend = SIGUSR2 ; break ;
default : strerr_dieusage(100, USAGE) ;
}
}
argc -= l.ind ; argv += l.ind ;
}
if ((argc < 2) || !uint0_scan(argv[0], &timeout)) strerr_dieusage(100, USAGE) ;
if (timeout) tain_from_millisecs(&deadline, timeout) ;
else deadline = tain_infinite_relative ;
x[0].fd = selfpipe_init() ;
if (x[0].fd < 0) strerr_diefu1sys(111, "selfpipe_init") ;
if (selfpipe_trap(SIGCHLD) < 0) strerr_diefu1sys(111, "selfpipe_trap") ;
pid = child_spawn0(argv[1], argv+1, envp) ;
if (!pid) strerr_diefu2sys(111, "spawn ", argv[1]) ;
tain_now_set_stopwatch_g() ;
tain_add_g(&deadline, &deadline) ;
for (;;)
{
int r = iopause_g(x, 1, &deadline) ;
if (r < 0) strerr_diefu1sys(111, "iopause") ;
if (!r) break ;
if (x[0].revents & IOPAUSE_READ)
{
int cont = 1 ;
while (cont)
{
switch (selfpipe_read())
{
case -1 : strerr_diefu1sys(111, "selfpipe_read") ;
case 0 : cont = 0 ; break ;
case SIGCHLD :
{
int wstat ;
if (wait_pid_nohang(pid, &wstat) == pid)
{
if (WIFSIGNALED(wstat))
strerr_diew1x(111, "child process crashed") ;
else return WEXITSTATUS(wstat) ;
}
}
default : strerr_diefu1x(101, "internal error, please submit a bug-report.") ;
}
}
}
}
kill(pid, tosend) ;
errno = ETIMEDOUT ;
strerr_diewu1sys(99, "wait for child process") ;
}
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