environ

Pointer to the process's environment variables

Synopsis:

#include <unistd.h>

extern char** environ;

Library:

libc

Description:

When a process begins, an array of strings called the environment is made available. This array is pointed to by the external variable environ. The array of strings have the form:

variable=value

and are terminated by a NULL pointer.

Classification:

POSIX 1003.1

Caveats:

Don't modify environ directly, use clearenv(), getenv(), putenv(), searchenv(), setenv(), and unsetenv().

Changes to the environment affect all threads in a multithreaded process.

See also:

clearenv(), getenv(), putenv(), searchenv(), setenv(), unsetenv()