Bug#532342: confirmation

[Aron Griffis]

I'm seeing this same bug.  It appears when the process is
connected to a pipe on stdout.  Here is my simple test:

$ time -15 4 true
real    0m0.013s

$ time -15 4 true | cat
real    0m4.012s

The problem is that 02-seconds.patch forks a new process which
interferes with signal delivery. The following replacement for
02-seconds.patch uses a better approach of setitimer(), the
high-resolution alternative to alarm().

--- tct-1.18.orig/src/misc/timeout.c	2007-01-11 16:10:29.000000000 -0500
+++ tct-1.18/src/misc/timeout.c	2009-09-10 08:53:09.000000000 -0400
@@ -39,6 +39,8 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <stdio.h>
+#include <sys/time.h>
+#include <sys/wait.h>
 
 extern int optind;
 
@@ -69,10 +71,11 @@ int     main(argc, argv)
 int     argc;
 char  **argv;
 {
-    int     time_to_run;
+    double  time_to_run;
     pid_t   pid;
     pid_t   child_pid;
     int     status;
+    struct  itimerval itv;
 
     progname = argv[0];
 
@@ -83,7 +86,7 @@ char  **argv;
 	if ((kill_signal = atoi(*argv + 1)) <= 0)
 	    usage();
 
-    if (argc < 2 || (time_to_run = atoi(argv[0])) <= 0)
+    if (argc < 2 || (time_to_run = atof(argv[0])) <= 0)
 	usage();
 
     commandname = argv[1];
@@ -105,7 +108,11 @@ char  **argv;
 	(void) signal(SIGQUIT, terminate);
 	(void) signal(SIGTERM, terminate);
 	(void) signal(SIGALRM, terminate);
-	alarm(time_to_run);
+	itv.it_value.tv_sec = (long)time_to_run;
+	itv.it_value.tv_usec = (time_to_run-itv.it_value.tv_sec)*1000000;
+	itv.it_interval.tv_sec = 0;
+	itv.it_interval.tv_usec = 0;
+	(void) setitimer(ITIMER_REAL, &itv, NULL);
 	while ((pid = wait(&status)) != -1 && pid != child_pid)
 	     /* void */ ;
 	return (pid == child_pid ? WEXITSTATUS(status) | WTERMSIG(status) : -1);