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/**
* setpgrep — run a program in a new process group
* Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <unistd.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <stddef.h>
int main(int argc, char* argv[])
{
int switch_print = 0;
int switch_export = 0;
int switch_help = 0;
pid_t group;
char** args;
size_t off;
for (off = 1; off < (size_t)argc; off++)
if (!strcmp(argv[off], "--print"))
switch_print = 1;
else if (!strcmp(argv[off], "--export"))
{
switch_export = ++off;
if (off == (size_t)argc)
goto help;
}
else if (!strcmp(argv[off], "--help"))
{
switch_help = 1;
goto help;
}
else if (!strcmp(argv[off], "--"))
{
off++;
break;
}
else if (argv[off][0] != '-')
break;
else
goto help;
group = setpgid(0, 0);
if (group == (pid_t)-1)
goto fail;
group = getpgrp();
args = malloc(argc * sizeof(char*));
if (args == NULL)
goto fail;
memcpy(args, argv + off, ((size_t)argc - off) * sizeof(char*));
args[argc - 1] = NULL;
if (switch_print)
if (printf("%ji\n", (intmax_t)group) < 0)
goto fail;
if (switch_export)
{
char group_str[3 * sizeof(pid_t) + 1];
if (sprintf(group_str, "%ji", (intmax_t)group) < 0)
goto fail;
if (setenv(argv[switch_export], group_str, 1) < 0)
goto fail;
}
execvp(args[0], args);
fail:
perror(*argv);
return 1;
help:
printf("USAGE: %s [options] [--] [command...]\n", *argv);
printf("\n");
printf(" --print Print the process group to stdout.\n");
printf(" --export VAR Export the process group to the ENV environment variable.\n");
printf("\n");
return !switch_help;
}
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