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UNISTD(3)		 BSD Library Functions Manual		     UNISTD(3)

NAME
     unistd — standard symbolic constants and types

SYNOPSIS
     #include <unistd.h>

DESCRIPTION
     The <unistd.h> header forms the basis of the Portable Operating System
     Interface for Unix (POSIX) API.  It includes definitions for numerous
     functions, symbolic constants, and types.	Among these are:

	   ·   The implementation-defined NULL pointer constant.

	   ·   Types such as size_t, ssize_t, pid_t, and intptr_t.

	   ·   Various limits and other symbolic constants described in
	       pathconf(2) and sysconf(3).

	   ·   Prototypes for several important system calls and library rou‐
	       tines such as chown(2), dup(2), execl(3), fork(2), pipe(2),
	       rmdir(2), setuid(2), and write(2).

	   ·   The symbolic constant _POSIX_VERSION that defines the version
	       of the POSIX standard to which the implementation conforms.

	   ·   Various other _POSIX -prefixed symbolic constants that indicate
	       whether the system implements some optional part of the stan‐
	       dard.  Examples include such constants as _POSIX_IPV6 for
	       inet6(4) functionality and _POSIX_ASYNCHRONOUS_IO for aio(3).

SEE ALSO
     limits(3), stddef(3), stdint(3), stdlib(3), types(3)

STANDARDS
     The <unistd.h> header conforms to IEEE Std 1003.1-2001 (“POSIX.1”).

BSD				August 9, 2011				   BSD

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