1 files changed, 123 insertions, 0 deletions
diff --git a/sys-utils/setsid.c b/sys-utils/setsid.c
new file mode 100644
index 0000000..8b4f83d
--- /dev/null
+++ b/sys-utils/setsid.c
@@ -0,0 +1,123 @@
+/*
+ * setsid.c -- execute a command in a new session
+ * Rick Sladkey <jrs@world.std.com>
+ * In the public domain.
+ *
+ * 1999-02-22 Arkadiusz Miśkiewicz <misiek@pld.ORG.PL>
+ * - added Native Language Support
+ *
+ * 2001-01-18 John Fremlin <vii@penguinpowered.com>
+ * - fork in case we are process group leader
+ *
+ * 2008-08-20 Daniel Kahn Gillmor <dkg@fifthhorseman.net>
+ * - if forked, wait on child process and emit its return code.
+ */
+
+#include <getopt.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include "c.h"
+#include "nls.h"
+#include "closestream.h"
+
+static void __attribute__((__noreturn__)) usage(void)
+{
+	FILE *out = stdout;
+	fputs(USAGE_HEADER, out);
+	fprintf(out, _(
+		" %s [options] <program> [arguments ...]\n"),
+		program_invocation_short_name);
+
+	fputs(USAGE_SEPARATOR, out);
+	fputs(_("Run a program in a new session.\n"), out);
+
+	fputs(USAGE_OPTIONS, out);
+	fputs(_(" -c, --ctty     set the controlling terminal to the current one\n"), out);
+	fputs(_(" -f, --fork     always fork\n"), out);
+	fputs(_(" -w, --wait     wait program to exit, and use the same return\n"), out);
+
+	printf(USAGE_HELP_OPTIONS(16));
+
+	printf(USAGE_MAN_TAIL("setsid(1)"));
+	exit(EXIT_SUCCESS);
+}
+
+int main(int argc, char **argv)
+{
+	int ch, forcefork = 0;
+	int ctty = 0;
+	pid_t pid;
+	int status = 0;
+
+	static const struct option longopts[] = {
+		{"ctty", no_argument, NULL, 'c'},
+		{"fork", no_argument, NULL, 'f'},
+		{"wait", no_argument, NULL, 'w'},
+		{"version", no_argument, NULL, 'V'},
+		{"help", no_argument, NULL, 'h'},
+		{NULL, 0, NULL, 0}
+	};
+
+	setlocale(LC_ALL, "");
+	bindtextdomain(PACKAGE, LOCALEDIR);
+	textdomain(PACKAGE);
+	atexit(close_stdout);
+
+	while ((ch = getopt_long(argc, argv, "+Vhcfw", longopts, NULL)) != -1)
+		switch (ch) {
+		case 'V':
+			printf(UTIL_LINUX_VERSION);
+			return EXIT_SUCCESS;
+		case 'c':
+			ctty=1;
+			break;
+		case 'f':
+			forcefork = 1;
+			break;
+		case 'w':
+			status = 1;
+			break;
+		case 'h':
+			usage();
+		default:
+			errtryhelp(EXIT_FAILURE);
+		}
+
+	if (argc - optind < 1) {
+		warnx(_("no command specified"));
+		errtryhelp(EXIT_FAILURE);
+	}
+
+	if (forcefork || getpgrp() == getpid()) {
+		pid = fork();
+		switch (pid) {
+		case -1:
+			err(EXIT_FAILURE, _("fork"));
+		case 0:
+			/* child */
+			break;
+		default:
+			/* parent */
+			if (!status)
+				return EXIT_SUCCESS;
+			if (wait(&status) != pid)
+				err(EXIT_FAILURE, "wait");
+			if (WIFEXITED(status))
+				return WEXITSTATUS(status);
+			err(status, _("child %d did not exit normally"), pid);
+		}
+	}
+	if (setsid() < 0)
+		/* cannot happen */
+		err(EXIT_FAILURE, _("setsid failed"));
+
+	if (ctty && ioctl(STDIN_FILENO, TIOCSCTTY, 1))
+		err(EXIT_FAILURE, _("failed to set the controlling terminal"));
+	execvp(argv[optind], argv + optind);
+	errexec(argv[optind]);
+}