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

     unistd -- standard symbolic constants and types

     #include <unistd.h>

     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:

	   o   The implementation-defined NULL pointer constant.

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

	   o   Various limits and other symbolic constants described in pathconf(2) and

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

	   o   The symbolic constant _POSIX_VERSION that defines the version of the POSIX stan-
	       dard to which the implementation conforms.

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

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

     The <unistd.h> header conforms to IEEE Std 1003.1-2001 (``POSIX.1'').

BSD					  August 9, 2011				      BSD
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