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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title><sys/types.h></title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_009_387"> </a>NAME</h4><blockquote>sys/types.h - data types</blockquote><h4><a name = "tag_000_009_388"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <sys/types.h></code></pre></blockquote><h4><a name = "tag_000_009_389"> </a>DESCRIPTION</h4><blockquote>The<i><sys/types.h></i>header includes definitions for at least the following types:<dl compact><dt><b>blkcnt_t</b><dd>Used for file block counts<dt><b>blksize_t</b><dd>Used for block sizes<dt><b>clock_t</b><dd><index term="data types, defined in <sys/types.h>"></index>Used for system times in clock ticks or CLOCKS_PER_SEC (see<i><a href="time.h.html"><time.h></a></i>).<dt><b>clockid_t</b><dd>Used for clock ID type in the clock and timer functions.<dt><b>dev_t</b><dd>Used for device IDs.<dt><b>fsblkcnt_t</b><dd>Used for file system block counts<dt><b>fsfilcnt_t</b><dd>Used for file system file counts<dt><b>gid_t</b><dd>Used for group IDs.<dt><b>id_t</b><dd>Used as a general identifier; can be used to contain at least a<b>pid_t</b>, <b>uid_t</b> or a <b>gid_t</b>.<dt><b>ino_t</b><dd>Used for file serial numbers.<dt><b>key_t</b><dd>Used for interprocess communication.<dt><b>mode_t</b><dd>Used for some file attributes.<dt><b>nlink_t</b><dd>Used for link counts.<dt><b>off_t</b><dd>Used for file sizes.<dt><b>pid_t</b><dd>Used for process IDs and process group IDs.<dt><b>pthread_attr_t</b><dd>Used to identify a thread attribute object.<dt><b>pthread_cond_t</b><dd>Used for condition variables.<dt><b>pthread_condattr_t</b><dd>Used to identify a condition attribute object.<dt><b>pthread_key_t</b><dd>Used for thread-specific data keys.<dt><b>pthread_mutex_t</b><dd>Used for mutexes.<dt><b>pthread_mutexattr_t</b><dd>Used to identify a mutex attribute object.<dt><b>pthread_once_t</b><dd>Used for dynamic package initialisation.<dt><b>pthread_rwlock_t</b><dd>Used for read-write locks.<dt><b>pthread_rwlockattr_t</b><dd>Used for read-write lock attributes.<dt><b>pthread_t</b><dd>Used to identify a thread.<dt><b>size_t</b><dd>Used for sizes of objects.<dt><b>ssize_t</b><dd>Used for a count of bytes or an error indication.<dt><b>suseconds_t</b><dd>Used for time in microseconds<dt><b>time_t</b><dd>Used for time in seconds.<dt><b>timer_t</b><dd>Used for timer ID returned by<i><a href="timer_create.html">timer_create()</a></i>.<dt><b>uid_t</b><dd>Used for user IDs.<dt><b>useconds_t</b><dd>Used for time in microseconds.</dl><p>All of the types are defined as arithmetic types of an appropriate length,with the following exceptions:<b>key_t</b>,<b>pthread_attr_t</b>,<b>pthread_cond_t</b>,<b>pthread_condattr_t</b>,<b>pthread_key_t</b>,<b>pthread_mutex_t</b>,<b>pthread_mutexattr_t</b>,<b>pthread_once_t</b>,<b>pthread_rwlock_t</b> and<b>pthread_rwlockattr_t</b>.Additionally,<b>blkcnt_t</b>and<b>off_t</b>are extendedsigned integral types,<b>fsblkcnt_t,</b><b>fsfilcnt_t</b>and<b>ino_t</b>are defined as extendedunsigned integral types,<b>size_t</b>is an unsigned integral type, and<b>blksize_t</b>,<b>pid_t</b>and<b>ssize_t</b>are signed integral types.The type<b>ssize_t</b>is capable of storing values at least in the range [-1, SSIZE_MAX]. The type<b>useconds_t</b>is an unsigned integral type capable of storing values at least in the range[0, 1,000,000].The type<b>suseconds_t</b>is a signed integral type capable of storing values at least in the range[-1, 1,000,000].<p>There are no defined comparison or assignment operators for the types<b>pthread_attr_t</b>, <b>pthread_cond_t</b>, <b>pthread_condattr_t</b>,<b>pthread_mutex_t</b>, <b>pthread_mutexattr_t</b>,<b>pthread_rwlock_t</b> and <b>pthread_rwlockattr_t</b>.</blockquote><h4><a name = "tag_000_009_390"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_009_391"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_009_392"> </a>SEE ALSO</h4><blockquote>None.</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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