GETENV(3C) Standard C Library Functions GETENV(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(7)) 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(7) for descriptions of the following attributes:


+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Standard |
+--------------------+-----------------+
|MT-Level | Safe |
+--------------------+-----------------+

SEE ALSO


exec(2), putenv(3C), attributes(7), environ(7), standards(7)

illumos July 24, 2002 GETENV(3C)