putenv(3)						     Library Functions Manual							 putenv(3)

NAME

       putenv - Sets an environment variable

LIBRARY

       Standard C Library (libc.so, libc.a)

SYNOPSIS

       #include <stdlib.h>

       int putenv(
	       const char *string);

STANDARDS

       Interfaces documented on this reference page conform to industry standards as follows:

       putenv():  XPG4, XPG4-UNIX

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

PARAMETERS

       Points to a name=value string.

DESCRIPTION

       The  putenv()  function sets the value of an environment variable by altering an existing variable or by creating a new one.  The new envi-
       ronment variable remains in effect even after the program setting it is exited.

       The string parameter points to a string of the form "name=value", where name is the environment variable and value is the new value for it.

NOTES

       The putenv() function manipulates the environ external variable, and it can be used in conjunction with the getenv() function. However, the
       third parameter to the main function (the environment pointer) is not changed.

       The putenv() function uses the malloc() function to enlarge the environment.

       A  potential  error is to call putenv() with an automatic variable as the argument and then exit the calling function while string is still
       part of the environment.

RETURN VALUES

       Upon successful completion, a value of 0 (zero) is returned.  If the malloc() function is unable to obtain sufficient space to  expand  the
       environment, the putenv() function returns a nonzero value.

RELATED INFORMATION

       Functions: clearenv(3), exec(2), getenv(3), malloc(3)

       Standards: standards(5) delim off

																	 putenv(3)