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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta name="generator" content="HTML Tidy, see www.w3.org"><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 --><!-- Copyright (c) 2001-2003 The Open Group, All Rights Reserved --><title>System Interfaces Chapter 2</title></head><body><basefont size="3"> <center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1-2001</font></center><hr size="2" noshade><h3><a name="tag_02_12"></a>Data Types</h3><p>All of the data types used by various functions are defined by the implementation. The following table describes some of thesetypes. Other types referenced in the description of a function, not mentioned here, can be found in the appropriate header for thatfunction.</p><center><table border="1" cellpadding="3" align="center"><tr valign="top"><th align="center"><p class="tent"><b>Defined Type</b></p></th><th align="center"><p class="tent"><b>Description</b></p></th></tr><tr valign="top"><td align="left"><p class="tent"><b>cc_t</b></p></td><td align="left"><p class="tent">Type used for terminal special characters.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>clock_t</b></p></td><td align="left"><p class="tent">Integer or real-floating type used for processor times, as defined in the ISO C standard.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>clockid_t</b></p></td><td align="left"><p class="tent">Used for clock ID type in some timer functions.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>dev_t</b></p></td><td align="left"><p class="tent">Arithmetic type used for device numbers.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>DIR</b></p></td><td align="left"><p class="tent">Type representing a directory stream.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>div_t</b></p></td><td align="left"><p class="tent">Structure type returned by the <i>div</i>() function.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>FILE</b></p></td><td align="left"><p class="tent">Structure containing information about a file.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>glob_t</b></p></td><td align="left"><p class="tent">Structure type used in pathname pattern matching.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>fpos_t</b></p></td><td align="left"><p class="tent">Type containing all information needed to specify uniquely every</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b> </b></p></td><td align="left"><p class="tent">position within a file.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>gid_t</b></p></td><td align="left"><p class="tent">Integer type used for group IDs.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>iconv_t</b></p></td><td align="left"><p class="tent">Type used for conversion descriptors.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>id_t</b></p></td><td align="left"><p class="tent">Integer type used as a general identifier; can be used to contain</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b> </b></p></td><td align="left"><p class="tent">at least the largest of a <b>pid_t</b>, <b>uid_t</b>, or <b>gid_t</b>.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>ino_t</b></p></td><td align="left"><p class="tent">Unsigned integer type used for file serial numbers.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>key_t</b></p></td><td align="left"><p class="tent">Arithmetic type used for XSI interprocess communication.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>ldiv_t</b></p></td><td align="left"><p class="tent">Structure type returned by the <i>ldiv</i>() function.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>mode_t</b></p></td><td align="left"><p class="tent">Integer type used for file attributes.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>mqd_t</b></p></td><td align="left"><p class="tent">Used for message queue descriptors.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>nfds_t</b></p></td><td align="left"><p class="tent">Integer type used for the number of file descriptors.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>nlink_t</b></p></td><td align="left"><p class="tent">Integer type used for link counts.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>off_t</b></p></td><td align="left"><p class="tent">Signed integer type used for file sizes.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>pid_t</b></p></td><td align="left"><p class="tent">Signed integer type used for process and process group IDs.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>pthread_attr_t</b></p></td><td align="left"><p class="tent">Used to identify a thread attribute object.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>pthread_cond_t</b></p></td><td align="left"><p class="tent">Used for condition variables.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>pthread_condattr_t</b></p></td><td align="left"><p class="tent">Used to identify a condition attribute object.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>pthread_key_t</b></p></td><td align="left"><p class="tent">Used for thread-specific data keys.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>pthread_mutex_t</b></p></td><td align="left"><p class="tent">Used for mutexes.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>pthread_mutexattr_t</b></p></td><td align="left"><p class="tent">Used to identify a mutex attribute object.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>pthread_once_t</b></p></td><td align="left"><p class="tent">Used for dynamic package initialization.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>pthread_rwlock_t</b></p></td><td align="left"><p class="tent">Used for read-write locks.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>pthread_rwlockattr_t</b></p></td><td align="left"><p class="tent">Used for read-write lock attributes.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>pthread_t</b></p></td><td align="left"><p class="tent">Used to identify a thread.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>ptrdiff_t</b></p></td><td align="left"><p class="tent">Signed integer type of the result of subtracting two pointers.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>regex_t</b></p></td><td align="left"><p class="tent">Structure type used in regular expression matching.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>regmatch_t</b></p></td><td align="left"><p class="tent">Structure type used in regular expression matching.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>rlim_t</b></p></td><td align="left"><p class="tent">Unsigned integer type used for limit values, to which objects of</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b> </b></p></td><td align="left"><p class="tent">type <b>int</b> and <b>off_t</b> can be cast without loss of value.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>sem_t</b></p></td><td align="left"><p class="tent">Type used in performing semaphore operations.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>sig_atomic_t</b></p></td><td align="left"><p class="tent">Integer type of an object that can be accessed as an atomic</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b> </b></p></td><td align="left"><p class="tent">entity, even in the presence of asynchronous interrupts.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>sigset_t</b></p></td><td align="left"><p class="tent">Integer or structure type of an object used to represent sets</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b> </b></p></td><td align="left"><p class="tent">of signals.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>size_t</b></p></td><td align="left"><p class="tent">Unsigned integer type used for size of objects.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>speed_t</b></p></td><td align="left"><p class="tent">Type used for terminal baud rates.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>ssize_t</b></p></td><td align="left"><p class="tent">Signed integer type used for a count of bytes or an error indication.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>suseconds_t</b></p></td><td align="left"><p class="tent">Signed integer type used for time in microseconds.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>tcflag_t</b></p></td><td align="left"><p class="tent">Type used for terminal modes.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>time_t</b></p></td><td align="left"><p class="tent">Integer or real-floating type used for time in seconds, as defined in the ISO C standard.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>timer_t</b></p></td><td align="left"><p class="tent">Used for timer ID returned by the <i>timer_create</i>() function.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>uid_t</b></p></td><td align="left"><p class="tent">Integer type used for user IDs.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>useconds_t</b></p></td><td align="left"><p class="tent">Unsigned integer type used for time in microseconds.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>va_list</b></p></td><td align="left"><p class="tent">Type used for traversing variable argument lists.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>wchar_t</b></p></td><td align="left"><p class="tent">Integer type whose range of values can represent distinct codes for</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b> </b></p></td><td align="left"><p class="tent">all members of the largest extended character set specified by the</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b> </b></p></td><td align="left"><p class="tent">supported locales.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>wctype_t</b></p></td><td align="left"><p class="tent">Scalar type which represents a character class descriptor.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>wint_t</b></p></td><td align="left"><p class="tent">Integer type capable of storing any valid value of <b>wchar_t</b> or</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b> </b></p></td><td align="left"><p class="tent">WEOF.</p></td></tr><tr valign="top"><td align="left"><p class="tent"><b>wordexp_t</b></p></td><td align="left"><p class="tent">Structure type used in word expansion.</p></td></tr></table></center><hr size="2" noshade><center><font size="2"><!--footer start-->UNIX ® is a registered Trademark of The Open Group.<br>POSIX ® is a registered Trademark of The IEEE.<br>[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href="../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>]</font></center><!--footer end--><hr size="2" noshade></body></html>⌨️ 快捷键说明
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