C Reference function getenv()
The function getenv() of the stdlib.h will get the environment string.
Usage of getenv():
char * getenv ( const char * name );
The function will retrieve a C string that is containing a value of the environment variable, which is specified with the name argument.
Parameters:
The name of the variable that you want to get.
Return value:
If the requested variable is not part of the environment list, the function returns a NULL pointer.
Source code example of abort():
#include<stdio.h>
#include<stdlib.h>
int main ()
{
char * ptr_path;
ptr_path = getenv ("PATH");
if (ptr_path!=NULL)
printf ("The set path is: %s",ptr_path);
return 0;
}
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Please explain a case in which getenv() is
successful. here PATH is not found for getenv(). SO it will return NULL.
@sivaraman – That is not correct, if null is returned then no environment path is found. If it is not null then an environment path is found. If I compile the sample then the output on a Windows 7 system is:
The set path is: C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\ImageConverter Plus\Microsoft.VC90.CRT;C:\Program Files (x86)\ImageConverter Plus\Microsoft.VC90.MFC;C:\Program Files (x86)\QuickTime\QTSystem\;C:\Program Files (x86)\ATI Technologies\ATI.ACE\Core-Static
So the example works. I hope that this helps you.