getsid - Get Session ID Utility

"getsid" is an open-source Linux command-line utility for obtaining the Session ID (SID) of a given Process ID (PID). This software is licensed under the GNU Lesser General Public License (LGPLv3 - http://www.gnu.org/licenses/lgpl-3.0.txt) and is made by Devyn Collier Johnson <[email protected]>.

To compile getsid, open a terminal in the same directory as the source code. Then, execute gcc -O3 -pedantic -Wall -std=gnu11 ./getsid.c -o ./getsid or gcc ./getsid.c -o ./getsid.

To install getsid, move the compiled binary to /usr/bin/ and then make it executable (using Root privileges) - cp ./getsid /usr/bin/getsid && chown root:root /usr/bin/getsid && chmod 755 /usr/bin/getsid.

To use getsid, type the command and then specify a PID. The command will return the Session ID of the specified PID. If no PID is specified, then a PID of "0" is assumed.

Download src and 64-bit binary

https://dcjtech.info/wp-content/uploads/2015/10/getsid.tar.gz

/*

Created by Devyn Collier Johnson

<[email protected]>

LGPLv3



GNU Lesser General Public License v3

Copyright (c) Devyn Collier Johnson, All rights reserved.



This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Lesser General Public

License as published by the Free Software Foundation; either

version 3.0 of the License, or (at your option) any later version.



This library 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

Lesser General Public License for more details.



You should have received a copy of the GNU Lesser General Public

License along with this library.

*/



#define _GNU_SOURCE

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <sys/syscall.h>

#include <sys/types.h>

//getsid() - returns the Session ID

int main(int argc, char *argv[]) {

	int pid, sid;

	if (argc > 2) {

		printf("Expected one or no parameters, but was given %d\n", argc - 1);

		return 1;

	} else if (argc == 1) {

		pid = 0;

	} else {

		pid = atoi(argv[1]);

	}

	pid_t getsid(pid_t pid);

	sid = getsid(pid);

	printf("%d\n", sid);

	return 0;

}