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.\" permission to reproduce portions of its copyrighted documentation.
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.\" of the system documentation.
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.\" Portions of this text are reprinted and reproduced in electronic form
.\" in the SunOS Reference Manual, from IEEE Std 1003.1, 2004 Edition,
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.\" Interface (POSIX), The Open Group Base Specifications Issue 6,
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.\" between these versions and the original IEEE and The Open Group
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.\" document.  The original Standard can be obtained online at
.\" http://www.opengroup.org/unix/online.html.
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.\" Copyright 1989 AT&T
.\" Copyright (c) 2003, Sun Microsystems, Inc.  All Rights Reserved.
.\"
.TH UNISTD.H 3HEAD "Sep 1, 2009"
.SH NAME
unistd.h, unistd \- standard symbolic constants and types
.SH SYNOPSIS
.LP
.nf
#include <unistd.h>
.fi

.SH DESCRIPTION
.sp
.LP
The <\fBunistd.h\fR> header defines the symbolic constants and structures which
are not already defined or declared in some other header. The contents of this
header  are shown below.
.SS "Version Test Macros"
.sp
.LP
The following symbolic constants are defined (with fixed values):
.sp
.ne 2
.na
\fB\fB_POSIX_VERSION\fR\fR
.ad
.RS 22n
Integer value indicating version of the POSIX standard (C language binding).
See \fBstandards\fR(5).
.RE

.sp
.ne 2
.na
\fB\fB_POSIX2_VERSION\fR\fR
.ad
.RS 22n
Integer value indicating version of the POSIX.2 standard (Commands).
.RE

.sp
.ne 2
.na
\fB\fB_POSIX2_C_VERSION\fR\fR
.ad
.RS 22n
Integer value indicating version of the POSIX.2 standard (C language binding).
.RE

.sp
.ne 2
.na
\fB\fB_XOPEN_VERSION\fR\fR
.ad
.RS 22n
Integer value indicating version of the XPG to which system conforms.
.RE

.sp
.ne 2
.na
\fB\fB_XOPEN_XCU_VERSION\fR\fR
.ad
.RS 22n
Integer value indicating the version of the XCU specification to which the
implementation conforms. If this constant is not defined, use the
\fBsysconf\fR(3C) function to determine which features are supported. This
constant is not defined for the SUSv3 environment.
.RE

.SS "Mandatory Symbolic Constants"
.sp
.LP
The following symbolic constants, if defined in <\fBunistd.h\fR>, have a value
of -1, 0, or greater, unless otherwise specified below. If these are undefined,
the \fBfpathconf\fR(2), \fBpathconf\fR(2), or \fBsysconf\fR(3C) functions can
be used to determine whether the option is provided for a particular invocation
of the application.
.sp
.LP
If a symbolic constant is defined with the value -1, the option is not
supported. Headers, data types, and function interfaces required only for the
option need not be supplied. An application that attempts to use anything
associated only with the option is considered to be requiring an extension.
.sp
.LP
If a symbolic constant is defined with a value greater than zero, the option is
always supported when the application is executed. All headers, data types, and
functions are present and operate as specified.
.sp
.LP
If a symbolic constant is defined with the value zero, all headers, data types,
and functions are present. The application can check at runtime to see whether
the option is supported by calling \fBfpathconf()\fR, \fBpathconf()\fR, or
\fBsysconf()\fR with the indicated \fIname\fR parameter.
.sp
.LP
Unless explicitly specified otherwise, the behavior of functions associated
with an unsupported option is unspecified, and an application that uses such
functions without first checking \fBfpathconf()\fR, \fBpathconf()\fR, or
\fBsysconf()\fR is considered to be requiring an extension.
.sp
.ne 2
.na
\fB\fB_POSIX_ADVISORY_INFO\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Advisory Information option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_ASYNCHRONOUS_IO\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Asynchronous Input and Output option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_BARRIERS\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Barriers option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_CLOCK_SELECTION\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Clock Selection option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_CPUTIME\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Process CPU-Time Clocks option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_FSYNC\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the File Synchronisation option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_IPV6\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the IPv6 option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_JOB_CONTROL\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports job control.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_MAPPED_FILES\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Memory Mapped Files option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_MEMLOCK\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Process Memory Locking option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_MEMLOCK_RANGE\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Range Memory Locking option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_MEMORY_PROTECTION\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Memory Protection option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_MESSAGE_PASSING\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Message Passing option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_MONOTONIC_CLOCK\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Monotonic Clock option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_PRIORITY_SCHEDULING\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Process Scheduling option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_RAW_SOCKETS\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Raw Sockets option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_READER_WRITER_LOCKS\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Read-Write Locks option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_REALTIME_SIGNALS\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Realtime Signals Extension option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_REGEXP\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Regular Expression Handling option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_SAVED_IDS\fR\fR
.ad
.sp .6
.RS 4n
The exec functions (see \fBexec\fR(2)) save the effective user and group.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_SEMAPHORES\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Semaphores option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_SHARED_MEMORY_OBJECTS\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Shared Memory Objects option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_SHELL\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the POSIX shell.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_SPAWN\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Spawn option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_SPIN_LOCKS\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Spin Locks option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_SPORADIC_SERVER\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Process Sporadic Server option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_SYNCHRONIZED_IO\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Synchronized Input and Output option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_THREAD_ATTR_STACKADDR\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the thread stack address attribute option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_THREAD_ATTR_STACKSIZE\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the thread stack size attribute option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_THREAD_CPUTIME\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Thread CPU-Time Clocks option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_THREAD_PROCESS_SHARED\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the process-shared synchronization option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_THREAD_SAFE_FUNCTIONS\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the thread-safe functions option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_THREAD_SPORADIC_SERVER\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Thread Sporadic Server option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_THREADS\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the threads option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_TIMERS\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Timers option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_TIMEOUTS\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Timeouts option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_TRACE\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Trace option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_TRACE_EVENT_FILTER\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Trace Event Filter option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_TRACE_INHERIT\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Trace Inherit option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_TRACE_LOG\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Trace Log option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_TYPED_MEMORY_OBJECTS\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Typed Memory Objects option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_V6_ILP32_OFF32\fR\fR
.ad
.sp .6
.RS 4n
Implementation provides a C-language compilation environment with 32-bit
\fBint\fR, \fBlong\fR, and \fBpointer\fR types and an \fBoff_t\fR type using at
least 64 bits.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_V6_ILP32_OFFBIG\fR\fR
.ad
.sp .6
.RS 4n
Implementation provides a C-language compilation environment with 32-bit
\fBint\fR, long\fB\fR, and \fBpointer\fR types and an \fBoff_t\fR type using at
least 64 bits.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_V6_LP64_OFF64\fR\fR
.ad
.sp .6
.RS 4n
Implementation provides a C-language compilation environment with 32-bit
\fBint\fR and 64-bit \fBlong\fR, \fBpointer\fR, and \fBoff_t\fR types.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_V6_LPBIG_OFFBIG\fR\fR
.ad
.sp .6
.RS 4n
Implementation provides a C-language compilation environment with an \fBint\fR
type using at least 32 bits and \fBlong\fR, \fBpointer\fR, and \fBoff_t\fR
types using at least 64 bits.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_XOPEN_STREAMS\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the XSI STREAMS Option Group.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX2_C_BIND\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the C Language Binding option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX2_C_DEV\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the C Language Development Utilities option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX2_CHAR_TERM\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports at least one terminal type.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX2_LOCALEDEF\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the creation of locales by the \fBlocaledef\fR(1)
utility.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX2_PBS\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Batch Environment Services and Utilities option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX2_PBS_ACCOUNTING\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Batch Accounting option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX2_PBS_CHECKPOINT\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Batch Checkpoint/Restart option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX2_PBS_LOCATE\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Locate Batch Job Request option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX2_PBS_MESSAGE\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Batch Job Message Request option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX2_PBS_TRACK\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Track Batch Job Request option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX2_SW_DEV\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Software Development Utilities option.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX2_UPE\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the User Portability Utilities option.
.RE

.sp
.ne 2
.na
\fB\fB_XBS5_ILP32_OFF32\fR\fR
.ad
.sp .6
.RS 4n
Implementation provides a C-language compilation environment with 32-bit
\fBint\fR, \fBlong\fR, \fBpointer\fR and \fBoff_t\fR types.
.RE

.sp
.ne 2
.na
\fB\fB_XBS5_ILP32_OFFBIG\fR\fR
.ad
.sp .6
.RS 4n
Implementation provides a C-language compilation environment with 32-bit
\fBint\fR, \fBlong\fR and \fBpointer\fR types and an \fBoff_t\fR type using at
least 64 bits.
.RE

.sp
.ne 2
.na
\fB\fB_XBS5_LP64_OFF64\fR\fR
.ad
.sp .6
.RS 4n
Implementation provides a C-language compilation environment with 32-bit
\fBint\fR and 64-bit \fBlong\fR, \fBpointer\fR and \fBoff_t\fR types.
.RE

.sp
.ne 2
.na
\fB\fB_XBS5_LPBIG_OFFBIG\fR\fR
.ad
.sp .6
.RS 4n
Implementation provides a C-language compilation environment with an \fBint\fR
type using at least 32 bits and \fBlong\fR, \fBpointer\fR and \fBoff_t\fR types
using at least 64 bits.
.RE

.sp
.ne 2
.na
\fB\fB_XOPEN_ENH_I18N\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Issue 4, Version 2 Enhanced Internationalization
Feature Group.
.RE

.sp
.ne 2
.na
\fB\fB_XOPEN_LEGACY\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Legacy Feature Group.
.RE

.sp
.ne 2
.na
\fB\fB_XOPEN_REALTIME\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the X/Open Realtime Feature Group.
.RE

.sp
.ne 2
.na
\fB\fB_XOPEN_SHM\fR\fR
.ad
.sp .6
.RS 4n
Implementation supports the Issue 4, Version 2 Shared Memory Feature Group.
.RE

.sp
.ne 2
.na
\fB\fB_XOPEN_UNIX\fR\fR
.ad
.sp .6
.RS 4n
X/Open CAE Specification, January 1997, System Interfaces and Headers, Issue 5
(ISBN: 1-85912-181-0, C606).
.RE

.sp
.ne 2
.na
\fB\fB_XOPEN_XPG3\fR\fR
.ad
.sp .6
.RS 4n
X/Open Specification, February 1992, System Interfaces and Headers, Issue 3
(ISBN: 1-872630-37-5, C212); this specification was formerly X/Open Portability
Guide, Issue 3, Volume 2, January 1989, XSI System Interface and Headers (ISBN:
0-13-685843-0, XO/XPG/89/003).
.RE

.sp
.ne 2
.na
\fB\fB_XOPEN_XPG4\fR\fR
.ad
.sp .6
.RS 4n
X/Open CAE Specification, July 1992, System Interfaces and Headers, Issue 4
(ISBN: 1-872630-47-2, C202).
.RE

.SS "Execution-time Symbolic Constants"
.sp
.LP
If any of the following constants are not defined in the header
\fB<unistd.h>\fR, the value varies depending on the file to which it is
applied.
.sp
.LP
If any of the following constants are defined to have value \(mi1 in the header
\fB<unistd.h>\fR, the implementation will not provide the option on any file;
if any are defined to have a value other than \(mi1 in the header
\fB<unistd.h>\fR, the implementation will provide the option on all applicable
files.
.sp
.LP
All of the following constants, whether defined in \fB<unistd.h>\fR or not, can
be queried with respect to a specific file using the \fBpathconf()\fR or
\fBfpathconf()\fR functions.
.sp
.ne 2
.na
\fB\fB_POSIX_ASYNC_IO\fR\fR
.ad
.RS 19n
Asynchronous input or output operations can be performed for the associated
file.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_PRIO_IO\fR\fR
.ad
.RS 19n
Prioritized input or output operations can be performed for the associated
file.
.RE

.sp
.ne 2
.na
\fB\fB_POSIX_SYNC_IO\fR\fR
.ad
.RS 19n
Synchronized input or output operations can be performed for the associated
file.
.RE

.SS "Constants for Functions"
.sp
.LP
The following constant is defined:
.sp
.ne 2
.na
\fB\fINULL\fR\fR
.ad
.RS 8n
Null pointer.
.RE

.sp
.LP
The following symbolic constants are defined for the \fBaccess\fR(2) function:
.sp
.ne 2
.na
\fB\fBR_OK\fR\fR
.ad
.RS 8n
Test for read permission.
.RE

.sp
.ne 2
.na
\fB\fBW_OK\fR\fR
.ad
.RS 8n
Test for write permission.
.RE

.sp
.ne 2
.na
\fB\fBX_OK\fR\fR
.ad
.RS 8n
Test for execute (search) permission.
.RE

.sp
.ne 2
.na
\fB\fBF_OK\fR\fR
.ad
.RS 8n
Test for existence of file.
.RE

.sp
.LP
The constants \fBF_OK\fR, \fBR_OK\fR, \fBW_OK\fR, and \fBX_OK\fR, and the
expressions \fBR_OK\||\|W_OK\fR, \fBR_OK\||\|X_OK\fR, and
\fBR_OK\||\|W_OK\||\|X_OK\fR all have distinct values.
.sp
.LP
The following symbolic constants are defined for the  \fBlockf\fR(3C) function:
.sp
.ne 2
.na
\fB\fBF_ULOCK\fR\fR
.ad
.RS 11n
Unlock a previously locked region.
.RE

.sp
.ne 2
.na
\fB\fBF_LOCK\fR\fR
.ad
.RS 11n
Lock a region for exclusive use.
.RE

.sp
.ne 2
.na
\fB\fBF_TLOCK\fR\fR
.ad
.RS 11n
Test and lock a region for exclusive use.
.RE

.sp
.ne 2
.na
\fB\fBF_TEST\fR\fR
.ad
.RS 11n
Test a region for other processes locks.
.RE

.sp
.LP
The following symbolic constants are defined for the  \fBlseek\fR(2) and
\fBfcntl\fR(2) functions (they have distinct values):
.sp
.ne 2
.na
\fB\fBSEEK_SET\fR\fR
.ad
.RS 12n
Set file offset to \fIoffset\fR.
.RE

.sp
.ne 2
.na
\fB\fBSEEK_CUR\fR\fR
.ad
.RS 12n
Set file offset to current plus \fIoffset\fR.
.RE

.sp
.ne 2
.na
\fB\fBSEEK_END\fR\fR
.ad
.RS 12n
Set file offset to EOF plus \fIoffset\fR.
.RE

.sp
.LP
The following symbolic constants are defined for the \fBconfstr\fR(3C) function
for both SPARC and x86:
.sp

.sp
.TS
l l
l l .
\fB_CS_LFS64_CFLAGS\fR	\fB_CS_LFS64_LDFLAGS\fR
\fB_CS_LFS64_LIBS\fR	\fB_CS_LFS64_LINTFLAGS\fR
\fB_CS_LFS_CFLAGS\fR	\fB_CS_LFS_LDFLAGS\fR
\fB_CS_LFS_LIBS\fR	\fB_CS_LFS_LINTFLAGS\fR
\fB_CS_PATH\fR	\fB_CS_POSIX_V6_ILP32_OFF32_CFLAGS\fR
\fB_CS_POSIX_V6_ILP32_OFF32_LDFLAGS\fR	\fB_CS_POSIX_V6_ILP32_OFF32_LIBS\fR
\fB_CS_POSIX_V6_ILP32_OFF32_LINTFLAGS\fR	\fB_CS_POSIX_V6_ILP32_OFFBIG_CFLAGS\fR
\fB_CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS\fR	\fB_CS_POSIX_V6_ILP32_OFFBIG_LIBS\fR
\fB_CS_POSIX_V6_ILP32_OFFBIG_LINTFLAGS\fR	\fB_CS_POSIX_V6_WIDTH_RESTRICTED_ENV\fR
\fB_CS_XBS5_ILP32_OFF32_CFLAGS\fR	\fB_CS_XBS5_ILP32_OFF32_LDFLAGS\fR
\fB_CS_XBS5_ILP32_OFF32_LIBS\fR	\fB_CS_XBS5_ILP32_OFF32_LINTFLAGS\fR
\fB_CS_XBS5_ILP32_OFFBIG_CFLAGS\fR	\fB_CS_XBS5_ILP32_OFFBIG_LDFLAGS\fR
\fB_CS_XBS5_ILP32_OFFBIG_LIBS\fR	\fB_CS_XBS5_ILP32_OFFBIG_LINTFLAGS\fR
.TE

.sp
.LP
The followwing symbolic constants are defined for the \fBconfstr()\fR function
for SPARC only:
.sp

.sp
.TS
l l
l l .
\fB_CS_POSIX_V6_LP64_OFF64_CFLAGS\fR	\fB_CS_POSIX_V6_LP64_OFF64_LDFLAGS\fR
\fB_CS_POSIX_V6_LP64_OFF64_LIBS\fR	\fB_CS_POSIX_V6_LP64_OFF64_LINTFLAGS\fR
\fB_CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS\fR	\fB_CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS\fR
\fB_CS_POSIX_V6_LPBIG_OFFBIG_LIBS\fR	\fB_CS_POSIX_V6_LPBIG_OFFBIG_LINTFLAGS\fR
\fB_CS_XBS5_LP64_OFF64_CFLAGS\fR	\fB_CS_XBS5_LP64_OFF64_LDFLAGS\fR
\fB_CS_XBS5_LP64_OFF64_LIBS\fR	\fB_CS_XBS5_LP64_OFF64_LINTFLAGS\fR
\fB_CS_XBS5_LPBIG_OFFBIG_CFLAGS\fR	\fB_CS_XBS5_LPBIG_OFFBIG_LDFLAGS\fR
\fB_CS_XBS5_LPBIG_OFFBIG_LIBS\fR	\fB_CS_XBS5_LPBIG_OFFBIG_LINTFLAGS\fR
.TE

.sp
.LP
The following symbolic constants are defined for the \fBsysconf\fR(3C)
function:
.sp

.sp
.TS
l l
l l .
\fB_SC_2_C_BIND\fR	\fB_SC_2_C_DEV\fR
\fB_SC_2_C_VERSION\fR	\fB_SC_2_FORT_DEV\fR
\fB_SC_2_FORT_RUN\fR	\fB_SC_2_LOCALEDEF\fR
\fB_SC_2_PBS\fR	\fB_SC_2_PBS_ACCOUNTING\fR
\fB_SC_2_PBS_CHECKPOINT\fR	\fB_SC_2_PBS_LOCATE\fR
\fB_SC_2_PBS_MESSAGE\fR	\fB_SC_2_PBS_TRACK\fR
\fB_SC_2_SW_DEV\fR	\fB_SC_2_UPE\fR
\fB_SC_2_VERSION\fR	\fB_SC_ADVISORY_INFO\fR
\fB_SC_AIO_LISTIO_MAX\fR	\fB_SC_AIO_MAX\fR
\fB_SC_AIO_PRIO_DELTA_MAX\fR	\fB_SC_ARG_MAX\fR
\fB_SC_ASYNCHRONOUS_IO\fR	\fB_SC_ATEXIT_MAX\fR
\fB_SC_AVPHYS_PAGES\fR	\fB_SC_BARRIERS\fR
\fB_SC_BC_BASE_MAX\fR	\fB_SC_BC_DIM_MAX\fR
\fB_SC_BC_SCALE_MAX\fR	\fB_SC_BC_STRING_MAX\fR
\fB_SC_CHILD_MAX\fR	\fB_SC_CLK_TCK\fR
\fB_SC_CLOCK_SELECTION\fR	\fB_SC_COLL_WEIGHTS_MAX\fR
\fB_SC_CPUTIME\fR	\fB_SC_DELAYTIMER_MAX\fR
\fB_SC_EXPR_NEST_MAX\fR	\fB_SC_FSYNC\fR
\fB_SC_GETGR_R_SIZE_MAX\fR	\fB_SC_GETPW_R_SIZE_MAX\fR
\fB_SC_HOST_NAME_MAX\fR	\fB_SC_IOV_MAX\fR
\fB_SC_IPV6\fR	\fB_SC_JOB_CONTROL\fR
\fB_SC_LINE_MAX\fR	\fB_SC_LOGIN_NAME_MAX\fR
\fB_SC_LOGNAME_MAX\fR	\fB_SC_MAPPED_FILES\fR
\fB_SC_MEMLOCK\fR	\fB_SC_MEMLOCK_RANGE\fR
\fB_SC_MEMORY_PROTECTION\fR	\fB_SC_MESSAGE_PASSING\fR
\fB_SC_MONOTONIC_CLOCK\fR	\fB_SC_MQ_OPEN_MAX\fR
\fB_SC_MQ_PRIO_MAX\fR	\fB_SC_NGROUPS_MAX\fR
\fB_SC_NPROCESSORS_CONF\fR	\fB_SC_NPROCESSORS_ONLN\fR
\fB_SC_OPEN_MAX\fR	\fB_SC_PAGESIZE\fR
\fB_SC_PAGE_SIZE\fR	\fB_SC_PASS_MAX\fR
\fB_SC_PHYS_PAGES\fR	\fB_SC_PRIORITIZED_IO\fR
\fB_SC_PRIORITY_SCHEDULING\fR	\fB_SC_RAW_SOCKETS\fR
\fB_SC_READER_WRITER_LOCKS\fR	\fB_SC_REALTIME_SIGNALS\fR
\fB_SC_REGEXP\fR	\fB_SC_RE_DUP_MAX\fR
\fB_SC_RTSIG_MAX\fR	\fB_SC_SAVED_IDS\fR
\fB_SC_SEMAPHORES\fR	\fB_SC_SEM_NSEMS_MAX\fR
\fB_SC_SEM_VALUE_MAX\fR	\fB_SC_SHARED_MEMORY_OBJECTS\fR
\fB_SC_SHELL\fR	\fB_SC_SIGQUEUE_MAX\fR
\fB_SC_SPAWN\fR	\fB_SC_SPIN_LOCKS\fR
\fB_SC_SPORADIC_SERVER\fR	\fB_SC_SS_REPL_MAX\fR
\fB_SC_STREAM_MAX\fR	\fB_SC_SYMLOOP_MAX\fR
\fB_SC_SYNCHRONIZED_IO\fR	\fB_SC_THREAD_ATTR_STACKADDR\fR
\fB_SC_THREAD_ATTR_STACKSIZE\fR	\fB_SC_THREAD_CPUTIME\fR
\fB_SC_THREAD_DESTRUCTOR_ITERATIONS\fR	\fB_SC_THREAD_KEYS_MAX\fR
\fB_SC_THREAD_PRIO_INHERIT\fR	\fB_SC_THREAD_PRIO_PROTECT\fR
\fB_SC_THREAD_PRIORITY_SCHEDULING\fR	\fB_SC_THREAD_PROCESS_SHARED\fR
\fB_SC_THREAD_SPORADIC_SERVER\fR	\fB_SC_THREADS\fR
\fB_SC_THREAD_SAFE_FUNCTIONS\fR	\fB_SC_THREAD_STACK_MIN\fR
\fB_SC_THREAD_THREADS_MAX\fR	\fB_SC_TIMEOUTS\fR
\fB_SC_TIMER_MAX\fR	\fB_SC_TIMERS\fR
\fB_SC_TRACE\fR	\fB_SC_TRACE_EVENT_FILTER\fR
\fB_SC_TRACE_EVENT_NAME_MAX\fR	\fB_SC_TRACE_INHERIT\fR
\fB_SC_TRACE_LOG\fR	\fB_SC_TRACE_NAME_MAX\fR
\fB_SC_TRACE_SYS_MAX\fR	\fB_SC_TRACE_USER_EVENT_MAX\fR
\fB_SC_TTY_NAME_MAX\fR	\fB_SC_TYPED_MEMORY_OBJECTS\fR
\fB_SC_TZNAME_MAX\fR	\fB_SC_V6_ILP32_OFF32\fR
\fB_SC_V6_ILP32_OFFBIG\fR	\fB_SC_V6_LP64_OFF64\fR
\fB_SC_V6_LPBIG_OFFBIG\fR	\fB_SC_VERSION\fR
\fB_SC_XBS5_ILP32_OFF32\fR	\fB_SC_XBS5_ILP32_OFFBIG\fR
\fB_SC_XBS5_LP64_OFF64\fR	\fB_SC_XBS5_LPBIG_OFFBIG\fR
\fB_SC_XOPEN_CRYPT\fR	\fB_SC_XOPEN_ENH_I18N\fR
\fB_SC_XOPEN_SHM\fR	\fB_SC_XOPEN_STREAMS\fR
\fB_SC_XOPEN_UNIX\fR	\fB_SC_XOPEN_VERSION\fR
\fB_SC_XOPEN_XCU_VERSION\fR	
.TE

.sp
.LP
The constants \fB_SC_PAGESIZE\fR and \fB_SC_PAGE_SIZE\fR can be defined to have
the same value.
.sp
.LP
The following symbolic constants are defined for the \fBfpathconf\fR(2)
function:
.sp

.sp
.TS
l l
l l .
\fB_PC_2_SYMLINKS\fR	\fB_PC_ALLOC_SIZE_MIN\fR
\fB_PC_ASYNC_IO\fR	\fB_PC_CHOWN_RESTRICTED\fR
\fB_PC_FILESIZEBITS\fR	\fB_PC_LINK_MAX\fR
\fB_PC_MAX_CANON\fR	\fB_PC_MAX_INPUT\fR
\fB_PC_NAME_MAX\fR	\fB_PC_NO_TRUNC\fR
\fB_PC_PATH_MAX\fR	\fB_PC_PIPE_BUF\fR
\fB_PC_PRIO_IO\fR	\fB_PC_REC_INCR_XFER_SIZE\fR
\fB_PC_REC_MAX_XFER_SIZE\fR	\fB_PC_REC_MIN_XFER_SIZE\fR
\fB_PC_REC_XFER_ALIGN\fR	\fB_PC_SYMLINK_MAX\fR
\fB_PC_SYNC_IO\fR	\fB_PC_TIMESTAMP_RESOLUTION\fR
\fB_PC_VDISABLE\fR	\fB_PC_XATTR_ENABLED\fR
\fB_PC_XATTR_EXISTS\fR	
.TE

.sp
.LP
The following symbolic constants are defined for file streams:
.sp
.ne 2
.na
\fB\fBSTDIN_FILENO\fR\fR
.ad
.RS 17n
File number (\fB0\fR) of \fBstdin\fR.
.RE

.sp
.ne 2
.na
\fB\fBSTDOUT_FILENO\fR\fR
.ad
.RS 17n
File number (\fB1\fR) of \fBstout\fR.
.RE

.sp
.ne 2
.na
\fB\fBSTDERR_FILENO\fR\fR
.ad
.RS 17n
File number (\fB2\fR) of \fBstderr\fR.
.RE

.sp
.LP
The following pathnames are defined:
.sp
.ne 2
.na
\fB\fBGF_PATH\fR\fR
.ad
.RS 11n
Pathname of the group file.
.RE

.sp
.ne 2
.na
\fB\fBPF_PATH\fR\fR
.ad
.RS 11n
Pathname of the passwd file.
.RE

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Committed
_
Standard	See \fBstandards\fR(5).
.TE

.SH SEE ALSO
.sp
.LP
\fBaccess\fR(2), \fBexec\fR(2), \fBfcntl\fR(2), \fBfpathconf\fR(2),
\fBlseek\fR(2), \fBconfstr\fR(3C), \fBlockf\fR(3C), \fBsysconf\fR(3C),
\fBtermios\fR(3C), \fBgroup\fR(4), \fBpasswd\fR(4), \fBattributes\fR(5),
\fBstandards\fR(5), \fBtermio\fR(7I)