STDLIB(3) | Library Functions Manual | STDLIB(3)

# NAME

`stdlib` — standard library definitions

# SYNOPSIS

`#include <stdlib.h>`

# DESCRIPTION

The `<stdlib.h>` header defines the following types and macros:

1. `NULL` - an implementation-defined null pointer constant;
2. size_t and wchar_t - integer types described in stddef(3);
3. div_t, ldiv_t, and lldiv_t - structures that are returned by the div(3), ldiv(3), and lldiv(3) functions, respectively;
4. `RAND_MAX` - a macro which expands to an integer constant that is the maximum value returned by the rand(3) function;
5. `MB_CUR_MAX` - an integer expression of type size_t whose value is the maximum number of bytes in a character specified by the current locale; and
6. `EXIT_SUCCESS` and `EXIT_FAILURE` - macros which expand to integer constants suitable for use as an argument to the exit(3) function.

The `<stdlib.h>` header also prototypes several important functions such as abort(3), atoi(3), bsearch(3), free(3), malloc(3), and strtol(3).

# SEE ALSO

stddef(3), types(3), unistd(3)

# STANDARDS

As described here, the `<stdlib.h>` header conforms to ISO/IEC 9899:1999 (“ISO C99”) and IEEE Std 1003.1-2001 (“POSIX.1”).

# HISTORY

In the current form the `<stdlib.h>` header was introduced in NetBSD 0.8.

April 10, 2011 | NetBSD 11.0