timeout: handle signals more transparently

* m4/jm-macros.m4: Define HAVE_SETRLIMIT.
* src/timeout.c: If the child exited with a signal,
raise that signal to the timeout process itself,
so that callers may also see the signal status.
Use setrlimit to disable core dumps for the timeout
process, which would be generated by some signals.

1 files changed, 23 insertions, 1 deletions

diff --git a/src/timeout.c b/src/timeout.c
index ab54ed675..ef660a717 100644
--- a/src/timeout.c
+++ b/src/timeout.c
@@ -58,6 +58,12 @@
 #include "error.h"
 #include "quote.h"
 
+#if HAVE_SETRLIMIT
+/* FreeBSD 5.0 at least needs <sys/types.h> and <sys/time.h> included
+   before <sys/resource.h>.  Currently "system.h" includes <sys/time.h>.  */
+# include <sys/resource.h>
+#endif
+
 #define PROGRAM_NAME "timeout"
 
 #define AUTHORS proper_name_utf8 ("Padraig Brady", "P\303\241draig Brady")
@@ -370,7 +376,23 @@ main (int argc, char **argv)
           if (WIFEXITED (status))
             status = WEXITSTATUS (status);
           else if (WIFSIGNALED (status))
-            status = WTERMSIG (status) + 128; /* what sh does at least.  */
+            {
+              int sig = WTERMSIG (status);
+#if HAVE_SETRLIMIT && defined RLIMIT_CORE
+              if (!timed_out)
+                {
+                  /* exit with the signal flag set, but avoid core files.  */
+                  if (setrlimit (RLIMIT_CORE, &(struct rlimit) {0,0}) == 0)
+                    {
+                      signal (sig, SIG_DFL);
+                      raise (sig);
+                    }
+                  else
+                    error (0, errno, _("warning: disabling core dumps failed"));
+                }
+#endif
+              status = sig + 128; /* what sh returns for signaled processes.  */
+            }
           else
             {
               /* shouldn't happen.  */