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4c63ebaa79
2000-03-26 Roland McGrath <roland@baalperazim.frob.com> * posix/unistd.h (intptr_t): Conditionalize on [__USE_MISC || __USE_XOPEN_EXTENDED] rather than on [__USE_UNIX98]. We need this for the sbrk decl, which can be included without Unix98.
1000 lines
36 KiB
C
1000 lines
36 KiB
C
/* Copyright (C) 1991-1999, 2000 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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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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/* POSIX Standard approved as ISO/IEC 9945-1 as of August, 1988 and
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extended by POSIX-1b (aka POSIX-4) and POSIX-1c (aka POSIX threads). */
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#define _POSIX_VERSION 199506L
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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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/* POSIX Standard approved as ISO/IEC 9945-2 as of December, 1993. */
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#define _POSIX2_C_VERSION 199209L
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/* The utilities on GNU systems also correspond to this version. */
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#define _POSIX2_VERSION 199209L
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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 1
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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 1
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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 1
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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 1
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/* X/Open version number to which the library conforms. It is selectable. */
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#ifdef __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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/* Encryption is present. */
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#define _XOPEN_CRYPT 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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#ifdef __USE_UNIX98
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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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#ifdef __USE_XOPEN
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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_MISC || defined __USE_XOPEN_EXTENDED
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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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/* 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;
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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) __THROW;
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#endif
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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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#endif
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#if defined __USE_BSD && !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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extern __off_t __lseek (int __fd, __off_t __offset, int __whence) __THROW;
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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
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extern __off64_t __REDIRECT (lseek,
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(int __fd, __off64_t __offset, int __whence)
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__THROW,
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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) __THROW;
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#endif
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/* Close the file descriptor FD. */
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extern int __close (int __fd) __THROW;
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extern int close (int __fd) __THROW;
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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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extern ssize_t __read (int __fd, void *__buf, size_t __nbytes) __THROW;
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extern ssize_t read (int __fd, void *__buf, size_t __nbytes) __THROW;
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/* Write N bytes of BUF to FD. Return the number written, or -1. */
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extern ssize_t __write (int __fd, __const void *__buf, size_t __n) __THROW;
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extern ssize_t write (int __fd, __const void *__buf, size_t __n) __THROW;
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#ifdef __USE_UNIX98
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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) __THROW;
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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) __THROW;
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# ifndef __USE_FILE_OFFSET64
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extern ssize_t pread (int __fd, void *__buf, size_t __nbytes, __off_t __offset)
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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) __THROW;
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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) __THROW,
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pread64);
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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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__THROW,
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pwrite64);
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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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extern ssize_t pread64 (int __fd, void *__buf, size_t __nbytes,
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__off64_t __offset) __THROW;
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extern ssize_t pwrite64 (int __fd, __const void *__buf, size_t __n,
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__off64_t __offset) __THROW;
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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;
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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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extern unsigned int sleep (unsigned int __seconds) __THROW;
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#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
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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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extern void usleep (__useconds_t __useconds) __THROW;
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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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extern int pause (void) __THROW;
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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;
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#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
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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;
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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;
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#endif /* Use BSD || X/Open Unix. */
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/* Change the process's working directory to PATH. */
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extern int chdir (__const char *__path) __THROW;
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#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
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/* Change the process's working directory to the one FD is open on. */
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extern int fchdir (int __fd) __THROW;
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#endif
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/* Get the pathname of the current working directory,
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and put it in SIZE bytes of BUF. Returns NULL if the
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directory couldn't be determined or SIZE was too small.
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If successful, returns BUF. In GNU, if BUF is NULL,
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an array is allocated with `malloc'; the array is SIZE
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bytes long, unless SIZE == 0, in which case it is as
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big as necessary. */
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extern char *getcwd (char *__buf, size_t __size) __THROW;
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#ifdef __USE_GNU
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/* Return a malloc'd string containing the current directory name.
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If the environment variable `PWD' is set, and its value is correct,
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that value is used. */
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extern char *get_current_dir_name (void) __THROW;
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#endif
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#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
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/* Put the absolute pathname of the current working directory in BUF.
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If successful, return BUF. If not, put an error message in
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BUF and return NULL. BUF should be at least PATH_MAX bytes long. */
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extern char *getwd (char *__buf) __THROW;
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#endif
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/* Duplicate FD, returning a new file descriptor on the same file. */
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extern int dup (int __fd) __THROW;
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/* Duplicate FD to FD2, closing FD2 and making it open on the same file. */
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extern int dup2 (int __fd, int __fd2) __THROW;
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/* NULL-terminated array of "NAME=VALUE" environment variables. */
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extern char **__environ;
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|
#ifdef __USE_GNU
|
|
extern char **environ;
|
|
#endif
|
|
|
|
|
|
/* Replace the current process, executing PATH with arguments ARGV and
|
|
environment ENVP. ARGV and ENVP are terminated by NULL pointers. */
|
|
extern int execve (__const char *__path, char *__const __argv[],
|
|
char *__const __envp[]) __THROW;
|
|
|
|
#ifdef __USE_GNU
|
|
/* Execute the file FD refers to, overlaying the running program image.
|
|
ARGV and ENVP are passed to the new program, as for `execve'. */
|
|
extern int fexecve (int __fd, char *__const __argv[], char *__const __envp[])
|
|
__THROW;
|
|
#endif
|
|
|
|
|
|
/* Execute PATH with arguments ARGV and environment from `environ'. */
|
|
extern int execv (__const char *__path, char *__const __argv[]) __THROW;
|
|
|
|
/* Execute PATH with all arguments after PATH until a NULL pointer,
|
|
and the argument after that for environment. */
|
|
extern int execle (__const char *__path, __const char *__arg, ...) __THROW;
|
|
|
|
/* Execute PATH with all arguments after PATH until
|
|
a NULL pointer and environment from `environ'. */
|
|
extern int execl (__const char *__path, __const char *__arg, ...) __THROW;
|
|
|
|
/* Execute FILE, searching in the `PATH' environment variable if it contains
|
|
no slashes, with arguments ARGV and environment from `environ'. */
|
|
extern int execvp (__const char *__file, char *__const __argv[]) __THROW;
|
|
|
|
/* Execute FILE, searching in the `PATH' environment variable if
|
|
it contains no slashes, with all arguments after FILE until a
|
|
NULL pointer and environment from `environ'. */
|
|
extern int execlp (__const char *__file, __const char *__arg, ...) __THROW;
|
|
|
|
|
|
#if defined __USE_MISC || defined __USE_XOPEN
|
|
/* Add INC to priority of the current process. */
|
|
extern int nice (int __inc) __THROW;
|
|
#endif
|
|
|
|
|
|
/* Terminate program execution with the low-order 8 bits of STATUS. */
|
|
extern void _exit (int __status) __attribute__ ((__noreturn__));
|
|
|
|
|
|
/* Get the `_PC_*' symbols for the NAME argument to `pathconf' and `fpathconf';
|
|
the `_SC_*' symbols for the NAME argument to `sysconf';
|
|
and the `_CS_*' symbols for the NAME argument to `confstr'. */
|
|
#include <bits/confname.h>
|
|
|
|
/* Get file-specific configuration information about PATH. */
|
|
extern long int pathconf (__const char *__path, int __name) __THROW;
|
|
|
|
/* Get file-specific configuration about descriptor FD. */
|
|
extern long int fpathconf (int __fd, int __name) __THROW;
|
|
|
|
/* Get the value of the system variable NAME. */
|
|
extern long int sysconf (int __name) __THROW;
|
|
|
|
#ifdef __USE_POSIX2
|
|
/* Get the value of the string-valued system variable NAME. */
|
|
extern size_t confstr (int __name, char *__buf, size_t __len) __THROW;
|
|
#endif
|
|
|
|
|
|
/* Get the process ID of the calling process. */
|
|
extern __pid_t __getpid (void) __THROW;
|
|
extern __pid_t getpid (void) __THROW;
|
|
|
|
/* Get the process ID of the calling process's parent. */
|
|
extern __pid_t getppid (void) __THROW;
|
|
|
|
/* Get the process group ID of the calling process.
|
|
This function is different on old BSD. */
|
|
#ifndef __FAVOR_BSD
|
|
extern __pid_t getpgrp (void) __THROW;
|
|
#else
|
|
# ifdef __REDIRECT
|
|
extern __pid_t __REDIRECT (getpgrp, (__pid_t __pid) __THROW, __getpgid);
|
|
# else
|
|
# define getpgrp __getpgid
|
|
# endif
|
|
#endif
|
|
|
|
/* Get the process group ID of process PID. */
|
|
extern __pid_t __getpgid (__pid_t __pid) __THROW;
|
|
#ifdef __USE_XOPEN_EXTENDED
|
|
extern __pid_t getpgid (__pid_t __pid) __THROW;
|
|
#endif
|
|
|
|
|
|
/* Set the process group ID of the process matching PID to PGID.
|
|
If PID is zero, the current process's process group ID is set.
|
|
If PGID is zero, the process ID of the process is used. */
|
|
extern int __setpgid (__pid_t __pid, __pid_t __pgid) __THROW;
|
|
extern int setpgid (__pid_t __pid, __pid_t __pgid) __THROW;
|
|
|
|
#if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED
|
|
/* Both System V and BSD have `setpgrp' functions, but with different
|
|
calling conventions. The BSD function is the same as POSIX.1 `setpgid'
|
|
(above). The System V function takes no arguments and puts the calling
|
|
process in its on group like `setpgid (0, 0)'.
|
|
|
|
New programs should always use `setpgid' instead.
|
|
|
|
The default in GNU is to provide the System V function. The BSD
|
|
function is available under -D_BSD_SOURCE. */
|
|
|
|
# ifndef __FAVOR_BSD
|
|
|
|
/* Set the process group ID of the calling process to its own PID.
|
|
This is exactly the same as `setpgid (0, 0)'. */
|
|
extern int setpgrp (void) __THROW;
|
|
|
|
# else
|
|
|
|
/* Another name for `setpgid' (above). */
|
|
# ifdef __REDIRECT
|
|
extern int __REDIRECT (setpgrp, (__pid_t __pid, __pid_t __pgrp) __THROW,
|
|
setpgid);
|
|
# else
|
|
# define setpgrp setpgid
|
|
# endif
|
|
|
|
# endif /* Favor BSD. */
|
|
#endif /* Use SVID or BSD. */
|
|
|
|
/* Create a new session with the calling process as its leader.
|
|
The process group IDs of the session and the calling process
|
|
are set to the process ID of the calling process, which is returned. */
|
|
extern __pid_t setsid (void) __THROW;
|
|
|
|
#ifdef __USE_XOPEN_EXTENDED
|
|
/* Return the session ID of the given process. */
|
|
extern __pid_t getsid (__pid_t __pid) __THROW;
|
|
#endif
|
|
|
|
/* Get the real user ID of the calling process. */
|
|
extern __uid_t getuid (void) __THROW;
|
|
|
|
/* Get the effective user ID of the calling process. */
|
|
extern __uid_t geteuid (void) __THROW;
|
|
|
|
/* Get the real group ID of the calling process. */
|
|
extern __gid_t getgid (void) __THROW;
|
|
|
|
/* Get the effective group ID of the calling process. */
|
|
extern __gid_t getegid (void) __THROW;
|
|
|
|
/* If SIZE is zero, return the number of supplementary groups
|
|
the calling process is in. Otherwise, fill in the group IDs
|
|
of its supplementary groups in LIST and return the number written. */
|
|
extern int getgroups (int __size, __gid_t __list[]) __THROW;
|
|
|
|
#ifdef __USE_GNU
|
|
/* Return nonzero iff the calling process is in group GID. */
|
|
extern int group_member (__gid_t __gid) __THROW;
|
|
#endif
|
|
|
|
/* Set the user ID of the calling process to UID.
|
|
If the calling process is the super-user, set the real
|
|
and effective user IDs, and the saved set-user-ID to UID;
|
|
if not, the effective user ID is set to UID. */
|
|
extern int setuid (__uid_t __uid) __THROW;
|
|
|
|
#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
|
|
/* Set the real user ID of the calling process to RUID,
|
|
and the effective user ID of the calling process to EUID. */
|
|
extern int setreuid (__uid_t __ruid, __uid_t __euid) __THROW;
|
|
#endif
|
|
|
|
#ifdef __USE_BSD
|
|
/* Set the effective user ID of the calling process to UID. */
|
|
extern int seteuid (__uid_t __uid) __THROW;
|
|
#endif /* Use BSD. */
|
|
|
|
/* Set the group ID of the calling process to GID.
|
|
If the calling process is the super-user, set the real
|
|
and effective group IDs, and the saved set-group-ID to GID;
|
|
if not, the effective group ID is set to GID. */
|
|
extern int setgid (__gid_t __gid) __THROW;
|
|
|
|
#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
|
|
/* Set the real group ID of the calling process to RGID,
|
|
and the effective group ID of the calling process to EGID. */
|
|
extern int setregid (__gid_t __rgid, __gid_t __egid) __THROW;
|
|
#endif
|
|
|
|
#ifdef __USE_BSD
|
|
/* Set the effective group ID of the calling process to GID. */
|
|
extern int setegid (__gid_t __gid) __THROW;
|
|
#endif /* Use BSD. */
|
|
|
|
|
|
/* Clone the calling process, creating an exact copy.
|
|
Return -1 for errors, 0 to the new process,
|
|
and the process ID of the new process to the old process. */
|
|
extern __pid_t __fork (void) __THROW;
|
|
extern __pid_t fork (void) __THROW;
|
|
|
|
#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
|
|
/* Clone the calling process, but without copying the whole address space.
|
|
The calling process is suspended until the new process exits or is
|
|
replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
|
|
and the process ID of the new process to the old process. */
|
|
extern __pid_t vfork (void) __THROW;
|
|
#endif /* Use BSD. */
|
|
|
|
|
|
/* Return the pathname of the terminal FD is open on, or NULL on errors.
|
|
The returned storage is good only until the next call to this function. */
|
|
extern char *ttyname (int __fd) __THROW;
|
|
|
|
/* Store at most BUFLEN characters of the pathname of the terminal FD is
|
|
open on in BUF. Return 0 on success, otherwise an error number. */
|
|
extern int ttyname_r (int __fd, char *__buf, size_t __buflen) __THROW;
|
|
|
|
/* Return 1 if FD is a valid descriptor associated
|
|
with a terminal, zero if not. */
|
|
extern int isatty (int __fd) __THROW;
|
|
|
|
#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
|
|
/* Return the index into the active-logins file (utmp) for
|
|
the controlling terminal. */
|
|
extern int ttyslot (void) __THROW;
|
|
#endif
|
|
|
|
|
|
/* Make a link to FROM named TO. */
|
|
extern int link (__const char *__from, __const char *__to) __THROW;
|
|
|
|
#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
|
|
/* Make a symbolic link to FROM named TO. */
|
|
extern int symlink (__const char *__from, __const char *__to) __THROW;
|
|
|
|
/* Read the contents of the symbolic link PATH into no more than
|
|
LEN bytes of BUF. The contents are not null-terminated.
|
|
Returns the number of characters read, or -1 for errors. */
|
|
extern int readlink (__const char *__path, char *__buf, size_t __len) __THROW;
|
|
#endif /* Use BSD. */
|
|
|
|
/* Remove the link NAME. */
|
|
extern int unlink (__const char *__name) __THROW;
|
|
|
|
/* Remove the directory PATH. */
|
|
extern int rmdir (__const char *__path) __THROW;
|
|
|
|
|
|
/* Return the foreground process group ID of FD. */
|
|
extern __pid_t tcgetpgrp (int __fd) __THROW;
|
|
|
|
/* Set the foreground process group ID of FD set PGRP_ID. */
|
|
extern int tcsetpgrp (int __fd, __pid_t __pgrp_id) __THROW;
|
|
|
|
|
|
/* Return the login name of the user. */
|
|
extern char *getlogin (void) __THROW;
|
|
#ifdef __USE_REENTRANT
|
|
/* Return at most NAME_LEN characters of the login name of the user in NAME.
|
|
If it cannot be determined or some other error occurred, return the error
|
|
code. Otherwise return 0. */
|
|
extern int getlogin_r (char *__name, size_t __name_len) __THROW;
|
|
#endif
|
|
|
|
#ifdef __USE_BSD
|
|
/* Set the login name returned by `getlogin'. */
|
|
extern int setlogin (__const char *__name) __THROW;
|
|
#endif
|
|
|
|
|
|
#ifdef __USE_POSIX2
|
|
/* Get definitions and prototypes for functions to process the
|
|
arguments in ARGV (ARGC of them, minus the program name) for
|
|
options given in OPTS. */
|
|
# define __need_getopt
|
|
# include <getopt.h>
|
|
#endif
|
|
|
|
|
|
#if defined __USE_BSD || defined __USE_XOPEN
|
|
|
|
/* Put the name of the current host in no more than LEN bytes of NAME.
|
|
The result is null-terminated if LEN is large enough for the full
|
|
name and the terminator. */
|
|
extern int gethostname (char *__name, size_t __len) __THROW;
|
|
|
|
/* Set the name of the current host to NAME, which is LEN bytes long.
|
|
This call is restricted to the super-user. */
|
|
extern int sethostname (__const char *__name, size_t __len) __THROW;
|
|
|
|
/* Set the current machine's Internet number to ID.
|
|
This call is restricted to the super-user. */
|
|
extern int sethostid (long int __id) __THROW;
|
|
|
|
|
|
/* Get and set the NIS (aka YP) domain name, if any.
|
|
Called just like `gethostname' and `sethostname'.
|
|
The NIS domain name is usually the empty string when not using NIS. */
|
|
extern int getdomainname (char *__name, size_t __len) __THROW;
|
|
extern int setdomainname (__const char *__name, size_t __len) __THROW;
|
|
|
|
|
|
/* Make all changes done to FD actually appear on disk. */
|
|
extern int fsync (int __fd) __THROW;
|
|
|
|
|
|
/* Revoke access permissions to all processes currently communicating
|
|
with the control terminal, and then send a SIGHUP signal to the process
|
|
group of the control terminal. */
|
|
extern int vhangup (void) __THROW;
|
|
|
|
/* Revoke the access of all descriptors currently open on FILE. */
|
|
extern int revoke (__const char *__file) __THROW;
|
|
|
|
|
|
/* Enable statistical profiling, writing samples of the PC into at most
|
|
SIZE bytes of SAMPLE_BUFFER; every processor clock tick while profiling
|
|
is enabled, the system examines the user PC and increments
|
|
SAMPLE_BUFFER[((PC - OFFSET) / 2) * SCALE / 65536]. If SCALE is zero,
|
|
disable profiling. Returns zero on success, -1 on error. */
|
|
extern int profil (unsigned short int *__sample_buffer, size_t __size,
|
|
size_t __offset, unsigned int __scale) __THROW;
|
|
|
|
|
|
/* Turn accounting on if NAME is an existing file. The system will then write
|
|
a record for each process as it terminates, to this file. If NAME is NULL,
|
|
turn accounting off. This call is restricted to the super-user. */
|
|
extern int acct (__const char *__name) __THROW;
|
|
|
|
/* Make PATH be the root directory (the starting point for absolute paths).
|
|
This call is restricted to the super-user. */
|
|
extern int chroot (__const char *__path) __THROW;
|
|
|
|
|
|
/* Successive calls return the shells listed in `/etc/shells'. */
|
|
extern char *getusershell (void) __THROW;
|
|
extern void endusershell (void) __THROW; /* Discard cached info. */
|
|
extern void setusershell (void) __THROW; /* Rewind and re-read the file. */
|
|
|
|
|
|
/* Prompt with PROMPT and read a string from the terminal without echoing.
|
|
Uses /dev/tty if possible; otherwise stderr and stdin. */
|
|
extern char *getpass (__const char *__prompt) __THROW;
|
|
|
|
/* Put the program in the background, and dissociate from the controlling
|
|
terminal. If NOCHDIR is zero, do `chdir ("/")'. If NOCLOSE is zero,
|
|
redirects stdin, stdout, and stderr to /dev/null. */
|
|
extern int daemon (int __nochdir, int __noclose) __THROW;
|
|
|
|
#endif /* Use BSD || X/Open. */
|
|
|
|
|
|
#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
|
|
|
|
/* Return the current machine's Internet number. */
|
|
extern long int gethostid (void) __THROW;
|
|
|
|
/* Make all changes done to all files actually appear on disk. */
|
|
extern int sync (void) __THROW;
|
|
|
|
|
|
/* Return the number of bytes in a page. This is the system's page size,
|
|
which is not necessarily the same as the hardware page size. */
|
|
extern int __getpagesize (void) __THROW __attribute__ ((__const__));
|
|
extern int getpagesize (void) __THROW __attribute__ ((__const__));
|
|
|
|
|
|
/* Truncate FILE to LENGTH bytes. */
|
|
#ifndef __USE_FILE_OFFSET64
|
|
extern int truncate (__const char *__file, __off_t __length) __THROW;
|
|
#else
|
|
# ifdef __REDIRECT
|
|
extern int __REDIRECT (truncate,
|
|
(__const char *__file, __off64_t __length) __THROW,
|
|
truncate64);
|
|
# else
|
|
# define truncate truncate64
|
|
# endif
|
|
#endif
|
|
#ifdef __USE_LARGEFILE64
|
|
extern int truncate64 (__const char *__file, __off64_t __length) __THROW;
|
|
#endif
|
|
|
|
/* Truncate the file FD is open on to LENGTH bytes. */
|
|
extern int __ftruncate (int __fd, __off_t __length) __THROW;
|
|
#ifndef __USE_FILE_OFFSET64
|
|
extern int ftruncate (int __fd, __off_t __length) __THROW;
|
|
#else
|
|
# ifdef __REDIRECT
|
|
extern int __REDIRECT (ftruncate, (int __fd, __off64_t __length) __THROW,
|
|
ftruncate64);
|
|
# else
|
|
# define ftruncate ftruncate64
|
|
# endif
|
|
#endif
|
|
#ifdef __USE_LARGEFILE64
|
|
extern int ftruncate64 (int __fd, __off64_t __length) __THROW;
|
|
#endif
|
|
|
|
|
|
/* Return the maximum number of file descriptors
|
|
the current process could possibly have. */
|
|
extern int getdtablesize (void) __THROW;
|
|
|
|
#endif /* Use BSD || X/Open Unix. */
|
|
|
|
|
|
#if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
|
|
|
|
/* Set the end of accessible data space (aka "the break") to ADDR.
|
|
Returns zero on success and -1 for errors (with errno set). */
|
|
extern int brk (void *__addr) __THROW;
|
|
|
|
/* Increase or decrease the end of accessible data space by DELTA bytes.
|
|
If successful, returns the address the previous end of data space
|
|
(i.e. the beginning of the new space, if DELTA > 0);
|
|
returns (void *) -1 for errors (with errno set). */
|
|
extern void *__sbrk (intptr_t __delta) __THROW;
|
|
extern void *sbrk (intptr_t __delta) __THROW;
|
|
#endif
|
|
|
|
|
|
#ifdef __USE_MISC
|
|
/* Invoke `system call' number SYSNO, passing it the remaining arguments.
|
|
This is completely system-dependent, and not often useful.
|
|
|
|
In Unix, `syscall' sets `errno' for all errors and most calls return -1
|
|
for errors; in many systems you cannot pass arguments or get return
|
|
values for all system calls (`pipe', `fork', and `getppid' typically
|
|
among them).
|
|
|
|
In Mach, all system calls take normal arguments and always return an
|
|
error code (zero for success). */
|
|
extern long int syscall (long int __sysno, ...) __THROW;
|
|
|
|
#endif /* Use misc. */
|
|
|
|
|
|
#if (defined __USE_MISC || defined __USE_XOPEN_EXTENDED) && !defined F_LOCK
|
|
/* NOTE: These declarations also appear in <fcntl.h>; be sure to keep both
|
|
files consistent. Some systems have them there and some here, and some
|
|
software depends on the macros being defined without including both. */
|
|
|
|
/* `lockf' is a simpler interface to the locking facilities of `fcntl'.
|
|
LEN is always relative to the current file position.
|
|
The CMD argument is one of the following. */
|
|
|
|
# define F_ULOCK 0 /* Unlock a previously locked region. */
|
|
# define F_LOCK 1 /* Lock a region for exclusive use. */
|
|
# define F_TLOCK 2 /* Test and lock a region for exclusive use. */
|
|
# define F_TEST 3 /* Test a region for other processes locks. */
|
|
|
|
# ifndef __USE_FILE_OFFSET64
|
|
extern int lockf (int __fd, int __cmd, __off_t __len) __THROW;
|
|
# else
|
|
# ifdef __REDIRECT
|
|
extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len) __THROW,
|
|
lockf64);
|
|
# else
|
|
# define lockf lockf64
|
|
# endif
|
|
# endif
|
|
# ifdef __USE_LARGEFILE64
|
|
extern int lockf64 (int __fd, int __cmd, __off64_t __len) __THROW;
|
|
# endif
|
|
#endif /* Use misc and F_LOCK not already defined. */
|
|
|
|
|
|
#ifdef __USE_GNU
|
|
|
|
/* Evaluate EXPRESSION, and repeat as long as it returns -1 with `errno'
|
|
set to EINTR. */
|
|
|
|
# define TEMP_FAILURE_RETRY(expression) \
|
|
(__extension__ \
|
|
({ long int __result; \
|
|
do __result = (long int) (expression); \
|
|
while (__result == -1L && errno == EINTR); \
|
|
__result; }))
|
|
#endif
|
|
|
|
#if defined __USE_POSIX199309 || defined __USE_UNIX98
|
|
/* Synchronize at least the data part of a file with the underlying
|
|
media. */
|
|
extern int fdatasync (int __fildes) __THROW;
|
|
#endif /* Use POSIX199309 */
|
|
|
|
|
|
/* XPG4.2 specifies that prototypes for the encryption functions must
|
|
be defined here. */
|
|
#ifdef __USE_XOPEN
|
|
/* Encrypt at most 8 characters from KEY using salt to perturb DES. */
|
|
extern char *crypt (__const char *__key, __const char *__salt) __THROW;
|
|
|
|
/* Setup DES tables according KEY. */
|
|
extern void setkey (__const char *__key) __THROW;
|
|
|
|
/* Encrypt data in BLOCK in place if EDFLAG is zero; otherwise decrypt
|
|
block in place. */
|
|
extern void encrypt (char *__block, int __edflag) __THROW;
|
|
|
|
|
|
/* Swab pairs bytes in the first N bytes of the area pointed to by
|
|
FROM and copy the result to TO. The value of TO must not be in the
|
|
range [FROM - N + 1, FROM - 1]. If N is odd the first byte in FROM
|
|
is without partner. */
|
|
extern void swab (__const void *__from, void *__to, ssize_t __n) __THROW;
|
|
#endif
|
|
|
|
|
|
/* The Single Unix specification, version 2, demands these prototypes
|
|
to be here. They are also found in <stdio.h>. */
|
|
#ifdef __USE_XOPEN
|
|
/* Return the name of the controlling terminal. */
|
|
extern char *ctermid (char *__s) __THROW;
|
|
|
|
/* Return the name of the current user. This function should not be
|
|
used and might go away some time. */
|
|
extern char *cuserid (char *__s) __THROW;
|
|
|
|
/* Rename file OLD to NEW. */
|
|
extern int rename (__const char *__old, __const char *__new) __THROW;
|
|
#endif
|
|
|
|
|
|
#ifdef __USE_POSIX199309
|
|
/* This function is only available if the system has POSIX threads. */
|
|
|
|
/* Install handlers to be called when a new process is created with FORK.
|
|
The PREPARE handler is called in the parent process just before performing
|
|
FORK. The PARENT handler is called in the parent process just after FORK.
|
|
The CHILD handler is called in the child process. Each of the three
|
|
handlers can be NULL, meaning that no handler needs to be called at that
|
|
point.
|
|
PTHREAD_ATFORK can be called several times, in which case the PREPARE
|
|
handlers are called in LIFO order (last added with PTHREAD_ATFORK,
|
|
first called before FORK), and the PARENT and CHILD handlers are called
|
|
in FIFO (first added, first called). */
|
|
extern int pthread_atfork (void (*__prepare) (void),
|
|
void (*__parent) (void),
|
|
void (*__child) (void)) __THROW;
|
|
#endif
|
|
|
|
__END_DECLS
|
|
|
|
#endif /* unistd.h */
|