Add sigexec utility

The sigexec utility unblocks all signals and execute specified command.

.gitignore

@@ -23,5 +23,6 @@
 /bin/clish
 /bin/konf
 /bin/konfd
+/bin/sigexec
 
 /klish-*.tar*

bin/module.am

@@ -2,7 +2,8 @@
 bin_PROGRAMS += \
 	bin/clish \
 	bin/konfd \
-	bin/konf
+	bin/konf \
+	bin/sigexec
 
 bin_clish_SOURCES = bin/clish.c
 bin_clish_LDADD = \
@@ -20,3 +21,5 @@ bin_konf_SOURCES = bin/konf.c
 bin_konf_LDADD = \
 	libkonf.la \
 	liblub.la
+
+bin_sigexec_SOURCES = bin/sigexec.c

bin/sigexec.c

@@ -0,0 +1,118 @@
+/*
+ * sigexec.c
+ *
+ * Programm to execute processes with unblocked signals.
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif /* HAVE_CONFIG_H */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <signal.h>
+#ifdef HAVE_GETOPT_H
+#include <getopt.h>
+#endif
+
+#ifndef VERSION
+#define VERSION 1.5.6
+#endif
+#define QUOTE(t) #t
+#define version(v) printf("%s\n", v)
+
+static void help(int status, const char *argv0);
+
+int main(int argc, char *argv[])
+{
+	char **child_argv;
+	sigset_t sigs;
+
+	static const char *shortopts = "+hv";
+#ifdef HAVE_GETOPT_H
+	static const struct option longopts[] = {
+		{"help",	0, NULL, 'h'},
+		{"version",	0, NULL, 'v'},
+		{NULL,		0, NULL, 0}
+	};
+#endif
+
+	while(1) {
+		int opt;
+#ifdef HAVE_GETOPT_H
+		opt = getopt_long(argc, argv, shortopts, longopts, NULL);
+#else
+		opt = getopt(argc, argv, shortopts);
+#endif
+		if (-1 == opt)
+			break;
+		switch (opt) {
+		case 0:
+			break;
+		case 'h':
+			help(0, argv[0]);
+			exit(0);
+			break;
+		case 'v':
+			version(VERSION);
+			exit(0);
+			break;
+		default:
+			help(1, argv[0]);
+			break;
+		}
+	}
+
+	child_argv = &argv[optind];
+	/* Check user command */
+	if (! child_argv[0]) {
+		fprintf(stderr, "Error: Nothing to execute.\n");
+		return 1;
+	}
+
+	/* Unblock signals */
+	sigemptyset(&sigs);
+	sigprocmask(SIG_BLOCK, &sigs, NULL);
+
+	/* Execute user command */
+/*	fprintf(stderr, "%s %s %s\n", child_argv[0], child_argv[1], child_argv[2]); */
+	if (execvp(child_argv[0], child_argv) < 0) {
+		fprintf(stderr, "Error: Cannot execute %s: %s\n",
+			child_argv[0], strerror(errno));
+		return 1;
+	}
+
+	return 0;
+}
+
+/*--------------------------------------------------------- */
+/* Print help message */
+static void help(int status, const char *argv0)
+{
+	const char *name = NULL;
+
+	if (!argv0)
+		return;
+
+	/* Find the basename */
+	name = strrchr(argv0, '/');
+	if (name)
+		name++;
+	else
+		name = argv0;
+
+	if (status != 0) {
+		fprintf(stderr, "Try `%s -h' for more information.\n",
+			name);
+	} else {
+		printf("Usage: %s [options] -- <command to execute>\n", name);
+		printf("Utility to execute process with unblocked signals.\n");
+		printf("Options:\n");
+		printf("\t-v, --version\tPrint utility version.\n");
+		printf("\t-h, --help\tPrint this help.\n");
+	}
+}