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Standard C Library Functionsgetenv(3C)


NAME

 getenv - return value for environment name

SYNOPSIS

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

DESCRIPTION

 

The getenv() function searches the environment list (see environ(5)) for a string of the form name=value and, if the string is present, returns a pointer to the value in the current environment.

RETURN VALUES

 

If successful, getenv() returns a pointer to the value in the current environment; otherwise, it returns a null pointer.

USAGE

 

The getenv() function can be safely called from a multithreaded application. Care must be exercised when using both getenv() and putenv(3C) in a multithreaded application. These functions examine and modify the environment list, which is shared by all threads in an application. The system prevents the list from being accessed simultaneously by two different threads. It does not, however, prevent two threads from successively accessing the environment list using getenv() or putenv(3C).

ATTRIBUTES

 

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
MT-LevelSafe

SEE ALSO

 

exec(2), putenv(3C), attributes(5), environ(5)


SunOS 5.9Go To TopLast Changed 29 Dec 1996

 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.