|GETENV(3)||Linux Programmer's Manual||GETENV(3)|
NAME¶getenv, secure_getenv - get an environment variable
#include <stdlib.h>char *getenv(const char *name); char *secure_getenv(const char *name);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
DESCRIPTION¶The getenv() function searches the environment list to find the environment variable name, and returns a pointer to the corresponding value string.
- the process's effective user ID did not match its real user ID or the process's effective group ID did not match its real group ID (typically this is the result of executing a set-user-ID or set-group-ID program);
- the effective capability bit was set on the executable file; or
- the process has a nonempty permitted capability set.
RETURN VALUE¶The getenv() function returns a pointer to the value in the environment, or NULL if there is no match.
CONFORMING TO¶getenv(): SVr4, POSIX.1-2001, 4.3BSD, C89, C99.
VERSIONS¶secure_getenv() first appeared in glibc 2.17.
NOTES¶The strings in the environment list are of the form name=value.
SEE ALSO¶clearenv(3), getauxval(3) putenv(3), setenv(3), unsetenv(3), capabilities(7), environ(7)
COLOPHON¶This page is part of release 3.44 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/.