Jeremy Visser » snippets https://jeremy.visser.name Fri, 16 Jul 2010 03:39:52 +0000 en hourly 1 http://wordpress.org/?v=3.0 Dump environment of a C program https://jeremy.visser.name/2009/10/29/dump-environment-of-a-c-program/ https://jeremy.visser.name/2009/10/29/dump-environment-of-a-c-program/#comments Thu, 29 Oct 2009 04:52:30 +0000 Jeremy http://jeremy.visser.name/?p=1308 Here is a quick ‘n dirty way to dump the environment of a C program without the aid of any external programs (i.e. if you can’t exec() into /usr/bin/env):

#include <unistd.h>
#include <stdio.h>
 
int main (int argc, char *argv[]) {
	extern char **environ;
	int e = 0;
 
	while (environ[e] != NULL) {
		printf("%s\r\n", environ[e]);
		e++;
	}
}

Outputs:

USERNAME=jeremy
DESKTOP_SESSION=gnome
PATH=/home/jeremy/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
PWD=/home/jeremy
[...]
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