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/* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "arg.h"
#define EXIT_ERROR 125
#define EXIT_EXEC 126
#define EXIT_NOENT 127
char *argv0;
static void
usage(void)
{
fprintf(stderr, "usage: %s [-e variable] [-pv] command [argument] ...\n", argv0);
exit(EXIT_ERROR);
}
int
main(int argc, char *argv[])
{
char group_str[3 * sizeof(pid_t) + 1];
int print_to_stdout = 0;
int print_to_stderr = 0;
char *export = NULL;
pid_t group;
ARGBEGIN {
case 'e':
export = EARGF(usage());
if (!*export)
usage();
break;
case 'p':
print_to_stdout = 1;
break;
case 'v':
print_to_stderr = 1;
break;
default:
usage();
} ARGEND;
if (!argc)
usage();
if (setpgid(0, 0)) {
fprintf(stderr, "%s: setpgid 0 0: %s\n", argv0, strerror(errno));
return EXIT_ERROR;
}
group = getpgrp();
if (print_to_stdout) {
printf("%ji\n", (intmax_t)group);
if (fflush(stdout) || ferror(stdout)) {
fprintf(stderr, "%s: printf: %s\n", argv0, strerror(errno));
return EXIT_ERROR;
}
}
if (export) {
sprintf(group_str, "%ji", (intmax_t)group);
if (setenv(export, group_str, 1)) {
fprintf(stderr, "%s: setenv %s %s 1: %s\n", argv0, export, group_str, strerror(errno));
return EXIT_ERROR;
}
}
if (print_to_stderr)
fprintf(stderr, "%s: running %s in process group %ji\n", argv0, argv[0], (intmax_t)group);
execvp(argv[0], argv);
fprintf(stderr, "%s: execvp %s: %s\n", argv0, argv[0], strerror(errno));
return errno == ENOENT ? EXIT_NOENT : EXIT_EXEC;
}
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