getenv(3C) Standard C Library Functions getenv(3C)NAMEgetenv - 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 appli‐
cation. 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 simulta‐
neously 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 TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Standard │
├─────────────────────────────┼─────────────────────────────┤
│MT-Level │Safe │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOexec(2), putenv(3C), attributes(5), environ(5), standards(5)SunOS 5.10 24 Jul 2002 getenv(3C)
