add binary timeout itself

diff --git a/timeout b/timeout
new file mode 100755 (executable)
index 0000000..e5c8241
Binary files /dev/null and b/timeout differ

diff --git a/timeout.c b/timeout.c
new file mode 100644 (file)
index 0000000..8cda986
--- /dev/null
+++ b/timeout.c
@@ -0,0 +1,108 @@
+/*++
+/* NAME
+/*     timeout 1
+/* SUMMARY
+/*     run command with bounded time
+/* SYNOPSIS
+/*     \fBtimeout\fR [-\fIsignal\fR] \fItime\fR \fIcommand\fR ...
+/* DESCRIPTION
+/*     \fBtimeout\fR executes a command and imposes an elapsed time limit.
+/*     The command is run in a separate POSIX process group so that the
+/*     right thing happens with commands that spawn child processes.
+/*
+/*     Arguments:
+/* .IP \fI-signal\fR
+/*     Specify an optional signal to send to the controlled process.
+/*     By default, \fBtimeout\fR sends SIGKILL, which cannot be caught
+/*     or ignored.
+/* .IP \fItime\fR
+/*     The elapsed time limit after which the command is terminated.
+/* .IP \fIcommand\fR
+/*     The command to be executed.
+/* DIAGNOSTICS
+/*     The command exit status is the exit status of the command
+/*     (status 1 in case of a usage error).
+/* AUTHOR(S)
+/*     Wietse Venema
+/*     This program is part of SATAN.
+/*--*/
+
+/* System libraries. */
+
+#include <sys/types.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+
+extern int optind;
+
+/* Application-specific. */
+
+#define perrorexit(s) { perror(s); exit(1); }
+
+static int kill_signal = SIGKILL;
+static char *progname;
+static char *commandname;
+
+static void usage()
+{
+    fprintf(stderr, "usage: %s [-signal] time command...\n", progname);
+    exit(1);
+}
+
+static void terminate(sig)
+int     sig;
+{
+    signal(kill_signal, SIG_DFL);
+    fprintf(stderr, "Timeout: aborting command ``%s'' with signal %d\n",
+           commandname, kill_signal);
+    kill(0, kill_signal);
+}
+
+int     main(argc, argv)
+int     argc;
+char  **argv;
+{
+    int     time_to_run;
+    pid_t   pid;
+    pid_t   child_pid;
+    int     status;
+
+    progname = argv[0];
+
+    /*
+     * Parse JCL.
+     */
+    while (--argc && *++argv && **argv == '-')
+       if ((kill_signal = atoi(*argv + 1)) <= 0)
+           usage();
+
+    if (argc < 2 || (time_to_run = atoi(argv[0])) <= 0)
+       usage();
+
+    commandname = argv[1];
+
+    /*
+     * Run the command and its watchdog in a separate process group so that
+     * both can be killed off with one signal.
+     */
+    setsid();
+    switch (child_pid = fork()) {
+    case -1:                                   /* error */
+       perrorexit("timeout: fork");
+    case 00:                                   /* run controlled command */
+       execvp(argv[1], argv + 1);
+       perrorexit(argv[1]);
+    default:                                   /* become watchdog */
+       (void) signal(SIGHUP, terminate);
+       (void) signal(SIGINT, terminate);
+       (void) signal(SIGQUIT, terminate);
+       (void) signal(SIGTERM, terminate);
+       (void) signal(SIGALRM, terminate);
+       alarm(time_to_run);
+       while ((pid = wait(&status)) != -1 && pid != child_pid)
+            /* void */ ;
+       return (pid == child_pid ? status : -1);
+    }
+}