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-rw-r--r--sys-utils/setpgid.c91
1 files changed, 91 insertions, 0 deletions
diff --git a/sys-utils/setpgid.c b/sys-utils/setpgid.c
new file mode 100644
index 0000000..936991d
--- /dev/null
+++ b/sys-utils/setpgid.c
@@ -0,0 +1,91 @@
+/*
+ * No copyright is claimed. This code is in the public domain; do with
+ * it what you wish.
+ *
+ * Written by Daan De Meyer <daan.j.demeyer@gmail.com>
+ */
+#include <getopt.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <signal.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 process group.\n"), out);
+
+ fputs(USAGE_OPTIONS, out);
+ fputs(_(" -f, --foregound Make a foreground process group\n"), out);
+
+ fprintf(out, USAGE_HELP_OPTIONS(16));
+
+ fprintf(out, USAGE_MAN_TAIL("setpgid(1)"));
+ exit(EXIT_SUCCESS);
+}
+
+int main(int argc, char **argv)
+{
+ int ch, foreground = 0, fd;
+ sigset_t s, old;
+
+ static const struct option longopts[] = {
+ {"foreground", no_argument, NULL, 'f'},
+ {"version", no_argument, NULL, 'V'},
+ {"help", no_argument, NULL, 'h'},
+ {NULL, 0, NULL, 0}
+ };
+
+ setlocale(LC_ALL, "");
+ bindtextdomain(PACKAGE, LOCALEDIR);
+ textdomain(PACKAGE);
+ close_stdout_atexit();
+
+ while ((ch = getopt_long(argc, argv, "+Vh", longopts, NULL)) != -1)
+ switch (ch) {
+ case 'f':
+ foreground = 1;
+ break;
+ case 'h':
+ usage();
+ case 'V':
+ print_version(EXIT_SUCCESS);
+ default:
+ errtryhelp(EXIT_FAILURE);
+ }
+
+ if (argc - optind < 1) {
+ warnx(_("no command specified"));
+ errtryhelp(EXIT_FAILURE);
+ }
+
+ if (setpgid(0, 0) < 0)
+ err(EXIT_FAILURE, _("setpgid failed"));
+
+ if (foreground) {
+ fd = open("/dev/tty", O_RDONLY|O_CLOEXEC);
+ if (fd >= 0) {
+ if (sigemptyset(&s) < 0)
+ err(EXIT_FAILURE, _("sigemptyset failed"));
+ if (sigaddset(&s, SIGTTOU) < 0)
+ err(EXIT_FAILURE, _("sigaddset failed"));
+ if (sigprocmask(SIG_BLOCK, &s, &old) < 0)
+ err(EXIT_FAILURE, _("sigprocmask failed"));
+ if (tcsetpgrp(fd, getpgid(0)) < 0)
+ err(EXIT_FAILURE, _("tcsetpgrp failed"));
+ if (sigprocmask(SIG_SETMASK, &old, NULL) < 0)
+ err(EXIT_FAILURE, _("sigprocmask failed"));
+ }
+ }
+
+ execvp(argv[optind], argv + optind);
+ errexec(argv[optind]);
+}