NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | CONFORMING TO | NOTES | SEE ALSO | COLOPHON
GETENV(3) Linux Programmer's Manual GETENV(3)
getenv - get an environment variable
#include <stdlib.h>
char *getenv(const char *name);
The getenv() function searches the environment list to find the environment
variable name, and returns a pointer to the corresponding value string.
The getenv() function returns a pointer to the value in the environment, or
NULL if there is no match.
SVr4, POSIX.1-2001, 4.3BSD, C89, C99.
The strings in the environment list are of the form name=value.
As typically implemented, getenv() returns a pointer to a string within the
environment list. The caller must take care not to modify this string, since
that would change the environment of the process.
The implementation of getenv() is not required to be reentrant. The string
pointed to by the return value of getenv() may be statically allocated, and
can be modified by a subsequent call to getenv(), putenv(3), setenv(3), or
unsetenv(3).
clearenv(3), putenv(3), setenv(3), unsetenv(3), environ(7)
This page is part of release 3.23 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can be found
at http://www.kernel.org/doc/man-pages/.
GNU 2008-03-17 GETENV(3)