unistd(3) - NetBSD Manual Pages

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UNISTD(3)               NetBSD 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''). NetBSD 9.1 August 9, 2011 NetBSD 9.1
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