topic Re: How to get the PWD in Operating System - HP-UX

How to get the PWD

Satya_6 — Mon, 02 Jun 2003 13:32:42 GMT

Hi,

how do I get the working directory in my c code?

I used `getenv` to get the current work directory, but it is returning NULL.

TIA
satya

Re: How to get the PWD

Bruno Vidal — Mon, 02 Jun 2003 13:47:25 GMT

Hi,
For myself, it works perfectly:

#include
main()
{
printf("%s\n",getenv("PWD"));
}

#cc -o toto toto.c
#./toto
/tmp

What's your code that return NULL ?

Re: How to get the PWD

A. Clay Stephenson — Mon, 02 Jun 2003 13:49:40 GMT

The cleaner way to do this from C is to simply use the getcwd() function. Man 3 getcwd for details.

Re: How to get the PWD

Mike Stroyan — Mon, 02 Jun 2003 14:30:13 GMT

getcwd() and getenv("PWD") may disagree if you cd through a symbolic link. The shell tracks current working directory with the symbolic link name in PWD. The getcwd() function uses a series of ".." steps with readdir and lstat to find the real directory names on the way to up to "/".

% echo $PWD
/home/stroyan
% mkdir real
% ln -s real symbolic
% cd symbolic
% echo $PWD
/home/stroyan/symbolic
% pwd
/home/stroyan/symbolic
% /usr/bin/pwd
/home/stroyan/real