From bea0037dbdd979603fb0b5be8b43f5478c1f6fec Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Fri, 19 Sep 2014 02:53:32 +0000
Subject: initial commit

---
 src/skaembutils/s6-maximumtime.c | 99 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 src/skaembutils/s6-maximumtime.c

(limited to 'src/skaembutils/s6-maximumtime.c')

diff --git a/src/skaembutils/s6-maximumtime.c b/src/skaembutils/s6-maximumtime.c
new file mode 100644
index 0000000..571914f
--- /dev/null
+++ b/src/skaembutils/s6-maximumtime.c
@@ -0,0 +1,99 @@
+/* ISC license. */
+
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <signal.h>
+#include <errno.h>
+#include <unistd.h>
+#include <skalibs/sgetopt.h>
+#include <skalibs/uint.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)
+{
+  unsigned int timeout ;
+  tain_t stamp, deadline ;
+  iopause_fd x[1] = { { .fd = -1, .events = IOPAUSE_READ, .revents = 0 } } ;
+  pid_t pid = 0 ;
+  int tosend = SIGTERM ;
+  PROG = "s6-maximumtime" ;
+  {
+    subgetopt_t l = SUBGETOPT_ZERO ;
+    for (;;)
+    {
+      register 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) timeout = 1 ;
+  if (!tain_from_millisecs(&deadline, timeout))
+    strerr_diefu1sys(111, "taia_from_millisecs") ;
+
+  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(&stamp) ;
+  tain_add(&deadline, &deadline, &stamp) ;
+
+  for (;;)
+  {
+    int r = iopause_stamp(x, 1, &deadline, &stamp) ;
+    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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