stdlib.h File Reference

<stdlib.h>: POSIX extensions to the C standard library More...

#include <stddef.h>

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Functions
int	getenv_r (const char *name, char *buf, size_t len)
	Get an environment variable into a caller-supplied buffer (BSD extension).
int	getsubopt (char **optionp, char *const *keylistp, char **valuep)
	Parse sub-options from a command-line argument string.
int	putenv (char *string)
	Add or change an environment variable (XSI extension).
int	setenv (const char *envname, const char *envval, int overwrite)
	Set the value of an environment variable.
int	unsetenv (const char *name)
	Remove an environment variable.

Detailed Description

<stdlib.h>: POSIX extensions to the C standard library

Provides POSIX and XSI extensions to the standard <stdlib.h> interface, including environment variable manipulation and sub-option parsing.

See also

POSIX.1-2017 <stdlib.h>

Definition in file stdlib.h.