GETENV(3) Linux Programmers Manual GETENV(3)
getenv - get an environment variable
char *getenv(const char *name);
The getenv() function searches the environment list to find the envi
ronment variable name, and returns a pointer to the corresponding value
The getenv() function returns a pointer to the value in the environ
ment, 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 3.05 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)