|
| 1 | +/* |
| 2 | + * setpgid.c -- execute a command in a new process group |
| 3 | + * Daan De Meyer <[email protected]> |
| 4 | + * In the public domain. |
| 5 | + */ |
| 6 | + |
| 7 | +#include <getopt.h> |
| 8 | +#include <stdio.h> |
| 9 | +#include <stdlib.h> |
| 10 | +#include <unistd.h> |
| 11 | +#include <signal.h> |
| 12 | + |
| 13 | +#include "closestream.h" |
| 14 | + |
| 15 | +static void __attribute__((__noreturn__)) usage(void) |
| 16 | +{ |
| 17 | + FILE *out = stdout; |
| 18 | + fputs(USAGE_HEADER, out); |
| 19 | + fprintf(out, _( |
| 20 | + " %s [options] <program> [arguments ...]\n"), |
| 21 | + program_invocation_short_name); |
| 22 | + |
| 23 | + fputs(USAGE_SEPARATOR, out); |
| 24 | + fputs(_("Run a program in a new process group.\n"), out); |
| 25 | + |
| 26 | + fputs(USAGE_OPTIONS, out); |
| 27 | + fputs(_(" -f, --foregound Make a foreground process group\n"), out); |
| 28 | + |
| 29 | + printf(USAGE_HELP_OPTIONS(16)); |
| 30 | + |
| 31 | + printf(USAGE_MAN_TAIL("setpgid(1)")); |
| 32 | + exit(EXIT_SUCCESS); |
| 33 | +} |
| 34 | + |
| 35 | +int main(int argc, char **argv) |
| 36 | +{ |
| 37 | + int ch, foreground = 0, fd; |
| 38 | + sigset_t s, old; |
| 39 | + |
| 40 | + static const struct option longopts[] = { |
| 41 | + {"foreground", no_argument, NULL, 'f'}, |
| 42 | + {"version", no_argument, NULL, 'V'}, |
| 43 | + {"help", no_argument, NULL, 'h'}, |
| 44 | + {NULL, 0, NULL, 0} |
| 45 | + }; |
| 46 | + |
| 47 | + setlocale(LC_ALL, ""); |
| 48 | + bindtextdomain(PACKAGE, LOCALEDIR); |
| 49 | + textdomain(PACKAGE); |
| 50 | + close_stdout_atexit(); |
| 51 | + |
| 52 | + while ((ch = getopt_long(argc, argv, "+Vh", longopts, NULL)) != -1) |
| 53 | + switch (ch) { |
| 54 | + case 'f': |
| 55 | + foreground = 1; |
| 56 | + break; |
| 57 | + case 'h': |
| 58 | + usage(); |
| 59 | + case 'V': |
| 60 | + print_version(EXIT_SUCCESS); |
| 61 | + default: |
| 62 | + errtryhelp(EXIT_FAILURE); |
| 63 | + } |
| 64 | + |
| 65 | + if (argc - optind < 1) { |
| 66 | + warnx(_("no command specified")); |
| 67 | + errtryhelp(EXIT_FAILURE); |
| 68 | + } |
| 69 | + |
| 70 | + if (setpgid(0, 0) < 0) |
| 71 | + err(EXIT_FAILURE, _("setpgid failed")); |
| 72 | + |
| 73 | + if (foreground) { |
| 74 | + fd = open("/dev/tty", O_RDONLY|O_CLOEXEC); |
| 75 | + if (fd >= 0) { |
| 76 | + if (sigemptyset(&s) < 0) |
| 77 | + err(EXIT_FAILURE, _("sigemptyset failed")); |
| 78 | + if (sigaddset(&s, SIGTTOU) < 0) |
| 79 | + err(EXIT_FAILURE, _("sigaddset failed")); |
| 80 | + if (sigprocmask(SIG_BLOCK, &s, &old) < 0) |
| 81 | + err(EXIT_FAILURE, _("sigprocmask failed")); |
| 82 | + if (tcsetpgrp(fd, getpgid(0)) < 0) |
| 83 | + err(EXIT_FAILURE, _("tcsetpgrp failed")); |
| 84 | + if (sigprocmask(SIG_SETMASK, &old, NULL) < 0) |
| 85 | + err(EXIT_FAILURE, _("sigprocmask failed")); |
| 86 | + } |
| 87 | + } |
| 88 | + |
| 89 | + execvp(argv[optind], argv + optind); |
| 90 | + errexec(argv[optind]); |
| 91 | +} |
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