unsetenv

Removes an environment variable with its value.

Library:LibC

Classification:ANSI

Service:Environment Variable

Syntax

  #include <stdlib.h> 
   
  int unsetenv (
     const char   *name);

If successful, returns 0. Otherwise, returns -1, leaves the environment unchanged, and sets errno to the following:

Decimal	Constant	Description
9	EINVAL	The name parameter is invalid.
77	ESRCH	The environment variable was not found.
105	ENOCONTEXT	No thread context is present.