Programming Forums > Application Development > C

thenewkid · May 17th, 2006, 2:16 PM

helloo...ill start off with this simple code:

#include <stdio.h>
#include <stdlib.h>

extern char **environ;

int main()   {

	char *pathval;

	if((pathval  = getenv("PATH")) != NULL)
		puts(pathval);

	putenv("Forum=Programming");
}

Im able to print the PATH variable, however i cannot add Forum=Programming to the environment..i have tried running the program as a root and normal user, but without seccess.. is the variable in the env. for the duration of program execution only? i have checked GNU glibc doc. but it wasnt mentionetd there, or i have missed it....thaks in advance...

DaWei · May 17th, 2006, 2:27 PM

Generally speaking, yup, it goes away. Each process gets it's own copy.

thenewkid · May 17th, 2006, 5:31 PM

thanx

May 17th, 2006, 2:16 PM	#1
thenewkid Programmer Join Date: Sep 2004 Location: New Jersey Posts: 36 Rep Power: 0	problem accessing environment in GNU sys. helloo...ill start off with this simple code: (Toggle Plain Text) #include <stdio.h> #include <stdlib.h> extern char *environ; int main() { char pathval; if((pathval = getenv("PATH")) != NULL) puts(pathval); putenv("Forum=Programming"); } #include <stdio.h> #include <stdlib.h> extern char *environ; int main() { char pathval; if((pathval = getenv("PATH")) != NULL) puts(pathval); putenv("Forum=Programming"); } Im able to print the PATH variable, however i cannot add Forum=Programming to the environment..i have tried running the program as a root and normal user, but without seccess.. is the variable in the env. for the duration of program execution only? i have checked GNU glibc doc. but it wasnt mentionetd there, or i have missed it....thaks in advance...

May 17th, 2006, 2:27 PM	#2
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	Generally speaking, yup, it goes away. Each process gets it's own copy. __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

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May 17th, 2006, 5:31 PM	#3
thenewkid Programmer Join Date: Sep 2004 Location: New Jersey Posts: 36 Rep Power: 0	thanx

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Programming Forums > Application Development > C

problem accessing environment in GNU sys.