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Example of how to use setuid() and setgid() under Linux in C.
/*
Created @ 03.02.2014
Copyright (C) 2014 Christian Mayer <http://fox21.at>
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 <stdio.h>
#include <sys/types.h>
#include <unistd.h>
int main(){
printf("start\n");
printf("sleep\n"); usleep(10 * 1000 * 1000);
uid_t uid = 1000; // user
gid_t gid = 100; // users
printf("setuid: %d\n", uid);
setuid(uid);
printf("sleep\n"); usleep(10 * 1000 * 1000);
printf("setgid: %d\n", gid);
setgid(gid);
printf("exit\n");
}
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