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/* ISC license. */
#include <stdint.h>
#include <errno.h>
#include <signal.h>
#include <unistd.h>
#include <skalibs/sgetopt.h>
#include <skalibs/types.h>
#include <skalibs/allreadwrite.h>
#include <skalibs/strerr2.h>
#include <skalibs/tai.h>
#include <skalibs/iopause.h>
#include <skalibs/djbunix.h>
#include <skalibs/sig.h>
#include <skalibs/selfpipe.h>
#include <s6/ftrigr.h>
#define USAGE "s6-ftrig-listen1 [ -t timeout ] fifodir regexp prog..."
static void handle_signals (void)
{
for (;;) switch (selfpipe_read())
{
case -1 : strerr_diefu1sys(111, "selfpipe_read") ;
case 0 : return ;
case SIGCHLD : wait_reap() ; break ;
default : strerr_dief1x(101, "unexpected data in selfpipe") ;
}
}
int main (int argc, char const *const *argv, char const *const *envp)
{
iopause_fd x[2] = { { -1, IOPAUSE_READ, 0 }, { -1, IOPAUSE_READ, 0 } } ;
tain deadline, tto ;
ftrigr_t a = FTRIGR_ZERO ;
pid_t pid ;
uint16_t id ;
char pack[2] = " \n" ;
PROG = "s6-ftrig-listen1" ;
{
unsigned int t = 0 ;
for (;;)
{
int opt = lgetopt(argc, argv, "t:") ;
if (opt == -1) break ;
switch (opt)
{
case 't' : if (uint0_scan(subgetopt_here.arg, &t)) break ;
default : strerr_dieusage(100, USAGE) ;
}
}
if (t) tain_from_millisecs(&tto, t) ;
else tto = tain_infinite_relative ;
argc -= subgetopt_here.ind ; argv += subgetopt_here.ind ;
}
if (argc < 3) strerr_dieusage(100, USAGE) ;
tain_now_set_stopwatch_g() ;
tain_add_g(&deadline, &tto) ;
if (!sig_altignore(SIGPIPE)) strerr_diefu1sys(111, "sig_ignore") ;
if (!ftrigr_startf_g(&a, &deadline)) strerr_diefu1sys(111, "ftrigr_startf") ;
id = ftrigr_subscribe_g(&a, argv[0], argv[1], 0, &deadline) ;
if (!id) strerr_diefu4sys(111, "subscribe to ", argv[0], " with regexp ", argv[1]) ;
x[0].fd = selfpipe_init() ;
if (x[0].fd < 0) strerr_diefu1sys(111, "selfpipe_init") ;
if (!selfpipe_trap(SIGCHLD)) strerr_diefu1sys(111, "selfpipe_trap") ;
x[1].fd = ftrigr_fd(&a) ;
pid = child_spawn0(argv[2], argv+2, envp) ;
if (!pid) strerr_diefu2sys(111, "spawn ", argv[2]) ;
for (;;)
{
int r = ftrigr_check(&a, id, &pack[0]) ;
if (r < 0) strerr_diefu1sys(111, "ftrigr_check") ;
if (r) break ;
r = iopause_g(x, 2, &deadline) ;
if (r < 0) strerr_diefu1sys(111, "iopause") ;
else if (!r)
{
errno = ETIMEDOUT ;
strerr_diefu1sys(1, "get expected event") ;
}
if (x[0].revents & IOPAUSE_READ) handle_signals() ;
if (x[1].revents & IOPAUSE_READ)
{
if (ftrigr_update(&a) < 0) strerr_diefu1sys(111, "ftrigr_update") ;
}
}
if (allwrite(1, pack, 2) < 2) strerr_diefu1sys(111, "write to stdout") ;
return 0 ;
}
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