/* Copyright (C) 1991-2018 Free Software Foundation, Inc.

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This file is part of the GNU C Library.

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The GNU C Library is free software; you can redistribute it and/or

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modify it under the terms of the GNU Lesser General Public

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License as published by the Free Software Foundation; either

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version 2.1 of the License, or (at your option) any later version.

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The GNU C Library is distributed in the hope that it will be useful,

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but WITHOUT ANY WARRANTY; without even the implied warranty of

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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

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Lesser General Public License for more details.

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You should have received a copy of the GNU Lesser General Public

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License along with the GNU C Library; if not, see

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<http://www.gnu.org/licenses/>. */

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/*

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* POSIX Standard: 2.10 Symbolic Constants <unistd.h>

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*/

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#ifndef _UNISTD_H

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#define _UNISTD_H 1

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#include <features.h>

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__BEGIN_DECLS

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/* These may be used to determine what facilities are present at compile time.

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Their values can be obtained at run time from `sysconf'. */

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#ifdef __USE_XOPEN2K8

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/* POSIX Standard approved as ISO/IEC 9945-1 as of September 2008. */

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# define _POSIX_VERSION 200809L

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#elif defined __USE_XOPEN2K

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/* POSIX Standard approved as ISO/IEC 9945-1 as of December 2001. */

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# define _POSIX_VERSION 200112L

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#elif defined __USE_POSIX199506

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/* POSIX Standard approved as ISO/IEC 9945-1 as of June 1995. */

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# define _POSIX_VERSION 199506L

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#elif defined __USE_POSIX199309

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/* POSIX Standard approved as ISO/IEC 9945-1 as of September 1993. */

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# define _POSIX_VERSION 199309L

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#else

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/* POSIX Standard approved as ISO/IEC 9945-1 as of September 1990. */

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# define _POSIX_VERSION 199009L

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#endif

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/* These are not #ifdef __USE_POSIX2 because they are

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in the theoretically application-owned namespace. */

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#ifdef __USE_XOPEN2K8

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# define __POSIX2_THIS_VERSION 200809L

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/* The utilities on GNU systems also correspond to this version. */

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#elif defined __USE_XOPEN2K

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/* The utilities on GNU systems also correspond to this version. */

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# define __POSIX2_THIS_VERSION 200112L

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#elif defined __USE_POSIX199506

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/* The utilities on GNU systems also correspond to this version. */

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# define __POSIX2_THIS_VERSION 199506L

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#else

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/* The utilities on GNU systems also correspond to this version. */

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# define __POSIX2_THIS_VERSION 199209L

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#endif

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/* The utilities on GNU systems also correspond to this version. */

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#define _POSIX2_VERSION __POSIX2_THIS_VERSION

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/* This symbol was required until the 2001 edition of POSIX. */

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#define _POSIX2_C_VERSION __POSIX2_THIS_VERSION

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/* If defined, the implementation supports the

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C Language Bindings Option. */

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#define _POSIX2_C_BIND __POSIX2_THIS_VERSION

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/* If defined, the implementation supports the

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C Language Development Utilities Option. */

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#define _POSIX2_C_DEV __POSIX2_THIS_VERSION

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/* If defined, the implementation supports the

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Software Development Utilities Option. */

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#define _POSIX2_SW_DEV __POSIX2_THIS_VERSION

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/* If defined, the implementation supports the

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creation of locales with the localedef utility. */

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#define _POSIX2_LOCALEDEF __POSIX2_THIS_VERSION

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/* X/Open version number to which the library conforms. It is selectable. */

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#ifdef __USE_XOPEN2K8

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# define _XOPEN_VERSION 700

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#elif defined __USE_XOPEN2K

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# define _XOPEN_VERSION 600

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#elif defined __USE_UNIX98

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# define _XOPEN_VERSION 500

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#else

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# define _XOPEN_VERSION 4

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#endif

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/* Commands and utilities from XPG4 are available. */

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#define _XOPEN_XCU_VERSION 4

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/* We are compatible with the old published standards as well. */

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#define _XOPEN_XPG2 1

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#define _XOPEN_XPG3 1

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#define _XOPEN_XPG4 1

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/* The X/Open Unix extensions are available. */

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#define _XOPEN_UNIX 1

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/* The enhanced internationalization capabilities according to XPG4.2

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are present. */

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#define _XOPEN_ENH_I18N 1

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/* The legacy interfaces are also available. */

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#define _XOPEN_LEGACY 1

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/* Get values of POSIX options:

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If these symbols are defined, the corresponding features are

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always available. If not, they may be available sometimes.

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The current values can be obtained with `sysconf'.

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_POSIX_JOB_CONTROL Job control is supported.

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_POSIX_SAVED_IDS Processes have a saved set-user-ID

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and a saved set-group-ID.

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_POSIX_REALTIME_SIGNALS Real-time, queued signals are supported.

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_POSIX_PRIORITY_SCHEDULING Priority scheduling is supported.

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_POSIX_TIMERS POSIX.4 clocks and timers are supported.

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_POSIX_ASYNCHRONOUS_IO Asynchronous I/O is supported.

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_POSIX_PRIORITIZED_IO Prioritized asynchronous I/O is supported.

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_POSIX_SYNCHRONIZED_IO Synchronizing file data is supported.

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_POSIX_FSYNC The fsync function is present.

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_POSIX_MAPPED_FILES Mapping of files to memory is supported.

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_POSIX_MEMLOCK Locking of all memory is supported.

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_POSIX_MEMLOCK_RANGE Locking of ranges of memory is supported.

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_POSIX_MEMORY_PROTECTION Setting of memory protections is supported.

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_POSIX_MESSAGE_PASSING POSIX.4 message queues are supported.

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_POSIX_SEMAPHORES POSIX.4 counting semaphores are supported.

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_POSIX_SHARED_MEMORY_OBJECTS POSIX.4 shared memory objects are supported.

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_POSIX_THREADS POSIX.1c pthreads are supported.

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_POSIX_THREAD_ATTR_STACKADDR Thread stack address attribute option supported.

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_POSIX_THREAD_ATTR_STACKSIZE Thread stack size attribute option supported.

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_POSIX_THREAD_SAFE_FUNCTIONS Thread-safe functions are supported.

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_POSIX_THREAD_PRIORITY_SCHEDULING

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POSIX.1c thread execution scheduling supported.

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_POSIX_THREAD_PRIO_INHERIT Thread priority inheritance option supported.

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_POSIX_THREAD_PRIO_PROTECT Thread priority protection option supported.

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_POSIX_THREAD_PROCESS_SHARED Process-shared synchronization supported.

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_POSIX_PII Protocol-independent interfaces are supported.

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_POSIX_PII_XTI XTI protocol-indep. interfaces are supported.

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_POSIX_PII_SOCKET Socket protocol-indep. interfaces are supported.

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_POSIX_PII_INTERNET Internet family of protocols supported.

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_POSIX_PII_INTERNET_STREAM Connection-mode Internet protocol supported.

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_POSIX_PII_INTERNET_DGRAM Connectionless Internet protocol supported.

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_POSIX_PII_OSI ISO/OSI family of protocols supported.

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_POSIX_PII_OSI_COTS Connection-mode ISO/OSI service supported.

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_POSIX_PII_OSI_CLTS Connectionless ISO/OSI service supported.

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_POSIX_POLL Implementation supports `poll' function.

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_POSIX_SELECT Implementation supports `select' and `pselect'.

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_XOPEN_REALTIME X/Open realtime support is available.

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_XOPEN_REALTIME_THREADS X/Open realtime thread support is available.

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_XOPEN_SHM Shared memory interface according to XPG4.2.

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_XBS5_ILP32_OFF32 Implementation provides environment with 32-bit

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int, long, pointer, and off_t types.

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_XBS5_ILP32_OFFBIG Implementation provides environment with 32-bit

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int, long, and pointer and off_t with at least

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64 bits.

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_XBS5_LP64_OFF64 Implementation provides environment with 32-bit

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int, and 64-bit long, pointer, and off_t types.

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_XBS5_LPBIG_OFFBIG Implementation provides environment with at

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least 32 bits int and long, pointer, and off_t

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with at least 64 bits.

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If any of these symbols is defined as -1, the corresponding option is not

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true for any file. If any is defined as other than -1, the corresponding

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option is true for all files. If a symbol is not defined at all, the value

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for a specific file can be obtained from `pathconf' and `fpathconf'.

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_POSIX_CHOWN_RESTRICTED Only the super user can use `chown' to change

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the owner of a file. `chown' can only be used

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to change the group ID of a file to a group of

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which the calling process is a member.

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_POSIX_NO_TRUNC Pathname components longer than

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NAME_MAX generate an error.

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_POSIX_VDISABLE If defined, if the value of an element of the

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`c_cc' member of `struct termios' is

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_POSIX_VDISABLE, no character will have the

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effect associated with that element.

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_POSIX_SYNC_IO Synchronous I/O may be performed.

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_POSIX_ASYNC_IO Asynchronous I/O may be performed.

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_POSIX_PRIO_IO Prioritized Asynchronous I/O may be performed.

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Support for the Large File Support interface is not generally available.

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If it is available the following constants are defined to one.

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_LFS64_LARGEFILE Low-level I/O supports large files.

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_LFS64_STDIO Standard I/O supports large files.

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*/

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#include <bits/posix_opt.h>

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/* Get the environment definitions from Unix98. */

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#if defined __USE_UNIX98 || defined __USE_XOPEN2K

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# include <bits/environments.h>

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#endif

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/* Standard file descriptors. */

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#define STDIN_FILENO 0 /* Standard input. */

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#define STDOUT_FILENO 1 /* Standard output. */

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#define STDERR_FILENO 2 /* Standard error output. */

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/* All functions that are not declared anywhere else. */

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#include <bits/types.h>

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#ifndef __ssize_t_defined

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typedef __ssize_t ssize_t;

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# define __ssize_t_defined

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#endif

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#define __need_size_t

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#define __need_NULL

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#include <stddef.h>

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#if defined __USE_XOPEN || defined __USE_XOPEN2K

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/* The Single Unix specification says that some more types are

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available here. */

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# ifndef __gid_t_defined

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typedef __gid_t gid_t;

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# define __gid_t_defined

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# endif

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# ifndef __uid_t_defined

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typedef __uid_t uid_t;

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# define __uid_t_defined

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# endif

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# ifndef __off_t_defined

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# ifndef __USE_FILE_OFFSET64

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typedef __off_t off_t;

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# else

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typedef __off64_t off_t;

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# endif

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# define __off_t_defined

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# endif

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# if defined __USE_LARGEFILE64 && !defined __off64_t_defined

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typedef __off64_t off64_t;

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# define __off64_t_defined

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# endif

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# ifndef __useconds_t_defined

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typedef __useconds_t useconds_t;

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# define __useconds_t_defined

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# endif

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# ifndef __pid_t_defined

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typedef __pid_t pid_t;

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# define __pid_t_defined

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# endif

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#endif /* X/Open */

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#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K

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# ifndef __intptr_t_defined

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typedef __intptr_t intptr_t;

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# define __intptr_t_defined

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# endif

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#endif

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#if defined __USE_MISC || defined __USE_XOPEN

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# ifndef __socklen_t_defined

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typedef __socklen_t socklen_t;

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# define __socklen_t_defined

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# endif

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#endif

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/* Values for the second argument to access.

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These may be OR'd together. */

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#define R_OK 4 /* Test for read permission. */

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#define W_OK 2 /* Test for write permission. */

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#define X_OK 1 /* Test for execute permission. */

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#define F_OK 0 /* Test for existence. */

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/* Test for access to NAME using the real UID and real GID. */

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extern int access (const char *__name, int __type) __THROW __nonnull ((1));

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#ifdef __USE_GNU

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/* Test for access to NAME using the effective UID and GID

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(as normal file operations use). */

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extern int euidaccess (const char *__name, int __type)

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__THROW __nonnull ((1));

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/* An alias for `euidaccess', used by some other systems. */

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extern int eaccess (const char *__name, int __type)

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__THROW __nonnull ((1));

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#endif

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#ifdef __USE_ATFILE

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/* Test for access to FILE relative to the directory FD is open on.

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If AT_EACCESS is set in FLAG, then use effective IDs like `eaccess',

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otherwise use real IDs like `access'. */

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extern int faccessat (int __fd, const char *__file, int __type, int __flag)

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__THROW __nonnull ((2)) __wur;

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#endif /* Use GNU. */

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/* Values for the WHENCE argument to lseek. */

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#ifndef _STDIO_H /* <stdio.h> has the same definitions. */

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# define SEEK_SET 0 /* Seek from beginning of file. */

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# define SEEK_CUR 1 /* Seek from current position. */

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# define SEEK_END 2 /* Seek from end of file. */

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# ifdef __USE_GNU

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# define SEEK_DATA 3 /* Seek to next data. */

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# define SEEK_HOLE 4 /* Seek to next hole. */

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# endif

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#endif

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#if defined __USE_MISC && !defined L_SET

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/* Old BSD names for the same constants; just for compatibility. */

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# define L_SET SEEK_SET

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# define L_INCR SEEK_CUR

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# define L_XTND SEEK_END

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#endif

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/* Move FD's file position to OFFSET bytes from the

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beginning of the file (if WHENCE is SEEK_SET),

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the current position (if WHENCE is SEEK_CUR),

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or the end of the file (if WHENCE is SEEK_END).

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Return the new file position. */

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#ifndef __USE_FILE_OFFSET64

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extern __off_t lseek (int __fd, __off_t __offset, int __whence) __THROW;

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#else

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# ifdef __REDIRECT_NTH

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extern __off64_t __REDIRECT_NTH (lseek,

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(int __fd, __off64_t __offset, int __whence),

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lseek64);

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# else

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# define lseek lseek64

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# endif

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#endif

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#ifdef __USE_LARGEFILE64

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extern __off64_t lseek64 (int __fd, __off64_t __offset, int __whence)

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__THROW;

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#endif

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/* Close the file descriptor FD.

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This function is a cancellation point and therefore not marked with

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__THROW. */

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extern int close (int __fd);

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/* Read NBYTES into BUF from FD. Return the

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number read, -1 for errors or 0 for EOF.

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This function is a cancellation point and therefore not marked with

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__THROW. */

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extern ssize_t read (int __fd, void *__buf, size_t __nbytes) __wur;

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/* Write N bytes of BUF to FD. Return the number written, or -1.

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This function is a cancellation point and therefore not marked with

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__THROW. */

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extern ssize_t write (int __fd, const void *__buf, size_t __n) __wur;

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#if defined __USE_UNIX98 || defined __USE_XOPEN2K8

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# ifndef __USE_FILE_OFFSET64

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/* Read NBYTES into BUF from FD at the given position OFFSET without

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changing the file pointer. Return the number read, -1 for errors

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or 0 for EOF.

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This function is a cancellation point and therefore not marked with

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__THROW. */

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extern ssize_t pread (int __fd, void *__buf, size_t __nbytes,

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__off_t __offset) __wur;

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/* Write N bytes of BUF to FD at the given position OFFSET without

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changing the file pointer. Return the number written, or -1.

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This function is a cancellation point and therefore not marked with

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__THROW. */

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extern ssize_t pwrite (int __fd, const void *__buf, size_t __n,

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__off_t __offset) __wur;

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# else

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# ifdef __REDIRECT

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extern ssize_t __REDIRECT (pread, (int __fd, void *__buf, size_t __nbytes,

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__off64_t __offset),

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pread64) __wur;

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extern ssize_t __REDIRECT (pwrite, (int __fd, const void *__buf,

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size_t __nbytes, __off64_t __offset),

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pwrite64) __wur;

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# else

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# define pread pread64

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# define pwrite pwrite64

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# endif

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# endif

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# ifdef __USE_LARGEFILE64

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/* Read NBYTES into BUF from FD at the given position OFFSET without

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changing the file pointer. Return the number read, -1 for errors

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or 0 for EOF. */

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extern ssize_t pread64 (int __fd, void *__buf, size_t __nbytes,

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__off64_t __offset) __wur;

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/* Write N bytes of BUF to FD at the given position OFFSET without

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changing the file pointer. Return the number written, or -1. */

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extern ssize_t pwrite64 (int __fd, const void *__buf, size_t __n,

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__off64_t __offset) __wur;

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# endif

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#endif

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/* Create a one-way communication channel (pipe).

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If successful, two file descriptors are stored in PIPEDES;

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bytes written on PIPEDES[1] can be read from PIPEDES[0].

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Returns 0 if successful, -1 if not. */

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extern int pipe (int __pipedes[2]) __THROW __wur;

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#ifdef __USE_GNU

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/* Same as pipe but apply flags passed in FLAGS to the new file

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descriptors. */

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extern int pipe2 (int __pipedes[2], int __flags) __THROW __wur;

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#endif

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/* Schedule an alarm. In SECONDS seconds, the process will get a SIGALRM.

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If SECONDS is zero, any currently scheduled alarm will be cancelled.

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The function returns the number of seconds remaining until the last

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alarm scheduled would have signaled, or zero if there wasn't one.

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There is no return value to indicate an error, but you can set `errno'

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to 0 and check its value after calling `alarm', and this might tell you.

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The signal may come late due to processor scheduling. */

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extern unsigned int alarm (unsigned int __seconds) __THROW;

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/* Make the process sleep for SECONDS seconds, or until a signal arrives

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and is not ignored. The function returns the number of seconds less

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than SECONDS which it actually slept (thus zero if it slept the full time).

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If a signal handler does a `longjmp' or modifies the handling of the

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SIGALRM signal while inside `sleep' call, the handling of the SIGALRM

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signal afterwards is undefined. There is no return value to indicate

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error, but if `sleep' returns SECONDS, it probably didn't work.

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This function is a cancellation point and therefore not marked with

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__THROW. */

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extern unsigned int sleep (unsigned int __seconds);

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#if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8) \

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|| defined __USE_MISC

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/* Set an alarm to go off (generating a SIGALRM signal) in VALUE

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microseconds. If INTERVAL is nonzero, when the alarm goes off, the

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timer is reset to go off every INTERVAL microseconds thereafter.

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Returns the number of microseconds remaining before the alarm. */

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extern __useconds_t ualarm (__useconds_t __value, __useconds_t __interval)

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__THROW;

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/* Sleep USECONDS microseconds, or until a signal arrives that is not blocked

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or ignored.

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This function is a cancellation point and therefore not marked with

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__THROW. */

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extern int usleep (__useconds_t __useconds);

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#endif

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/* Suspend the process until a signal arrives.

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This always returns -1 and sets `errno' to EINTR.

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This function is a cancellation point and therefore not marked with

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__THROW. */

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extern int pause (void);

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/* Change the owner and group of FILE. */

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extern int chown (const char *__file, __uid_t __owner, __gid_t __group)

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__THROW __nonnull ((1)) __wur;

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#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8

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/* Change the owner and group of the file that FD is open on. */

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extern int fchown (int __fd, __uid_t __owner, __gid_t __group) __THROW __wur;

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/* Change owner and group of FILE, if it is a symbolic

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link the ownership of the symbolic link is changed. */

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extern int lchown (const char *__file, __uid_t __owner, __gid_t __group)

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__THROW __nonnull ((1)) __wur;

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#endif /* Use X/Open Unix. */

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#ifdef __USE_ATFILE

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/* Change the owner and group of FILE relative to the directory FD is open

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on. */

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extern int fchownat (int __fd, const char *__file, __uid_t __owner,

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__gid_t __group, int __flag)

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__THROW __nonnull ((2)) __wur;

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#endif /* Use GNU. */

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/* Change the process's working directory to PATH. */

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extern int chdir (const char *__path) __THROW __nonnull ((1)) __wur;

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#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8

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/* Change the process's working directory to the one FD is open on. */

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