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UNISTD(3) 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 routines 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 standard. 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"). NetBSD 8.99.34 August 9, 2011 NetBSD 8.99.34