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