[hackers] [ubase] Add respawn || sin

From: <git_AT_suckless.org>
Date: Thu, 17 Apr 2014 15:08:50 +0200

commit c4ff95798cd66d7c36789e58db83fc51d46442fc
Author: sin <sin_AT_2f30.org>
Date: Thu Apr 17 14:00:36 2014 +0100

    Add respawn

diff --git a/Makefile b/Makefile
index 05896d6..dd2f1cd 100644
--- a/Makefile
+++ b/Makefile
_AT_@ -40,6 +40,7 @@ SRC = \
         pidof.c \
         pivot_root.c \
         ps.c \
+ respawn.c \
         rmmod.c \
         stat.c \
         su.c \
_AT_@ -67,6 +68,7 @@ MAN1 = \
         pagesize.1 \
         pidof.1 \
         ps.1 \
+ respawn.1 \
         stat.1 \
         su.1 \
         truncate.1 \
diff --git a/respawn.1 b/respawn.1
new file mode 100644
index 0000000..f9d68a1
--- /dev/null
+++ b/respawn.1
_AT_@ -0,0 +1,12 @@
+.TH RESPAWN 1 ubase-VERSION
+.SH NAME
+BrespawnR - Spawn the given command repeatedly
+.SH SYNOPSIS
+BrespawnR [B-dI NR] IcmdR [Iargs...R]
+.SH DESCRIPTION
+BrespawnR spawns the given IcmdR in a new session
+repeatedly.
+.SH OPTIONS
+.TP
+B-dR
+Set the delay between invocations of IcmdR. It defaults to 0.
diff --git a/respawn.c b/respawn.c
new file mode 100644
index 0000000..c2aeea0
--- /dev/null
+++ b/respawn.c
_AT_@ -0,0 +1,54 @@
+/* See LICENSE file for copyright and license details. */
+#include <errno.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include "util.h"
+
+static void
+usage(void)
+{
+ eprintf("usage: respawn [-d N] cmd [args...]
");
+}
+
+int
+main(int argc, char **argv)
+{
+ pid_t pid;
+ int savederrno;
+ unsigned int delay = 0;
+
+ ARGBEGIN {
+ case 'd':
+ delay = estrtol(EARGF(usage()), 0);
+ break;
+ default:
+ usage();
+ } ARGEND;
+
+ if(argc < 1)
+ usage();
+
+ while (1) {
+ pid = fork();
+ if (pid < 0)
+ eprintf("fork:");
+ switch (pid) {
+ case 0:
+ if (setsid() < 0)
+ eprintf("setsid:");
+ execvp(argv[0], argv);
+ savederrno = errno;
+ weprintf("execvp %s:", argv[0]);
+ _exit(savederrno == ENOENT ? 127 : 126);
+ break;
+ default:
+ waitpid(pid, NULL, 0);
+ break;
+ }
+ sleep(delay);
+ }
+ /* not reachable */
+ return EXIT_SUCCESS;
+}
Received on Thu Apr 17 2014 - 15:08:50 CEST