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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>ptsname</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="ptsname"></a> <a name="tag_03_578"></a><!-- ptsname --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2003 Edition<br>Copyright © 2001-2003 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_03_578_01"></a>NAME</h4><blockquote>ptsname - get name of the slave pseudo-terminal device</blockquote><h4><a name="tag_03_578_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><div class="box"><code><tt><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> #include <<a href="../basedefs/stdlib.h.html">stdlib.h</a>><br><br> char *ptsname(int</tt> <i>fildes</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div><tt><br></tt></blockquote><h4><a name="tag_03_578_03"></a>DESCRIPTION</h4><blockquote><p>The <i>ptsname</i>() function shall return the name of the slave pseudo-terminal device associated with a master pseudo-terminaldevice. The <i>fildes</i> argument is a file descriptor that refers to the master device. The <i>ptsname</i>() function shallreturn a pointer to a string containing the pathname of the corresponding slave device.</p><p>The <i>ptsname</i>() function need not be reentrant. A function that is not required to be reentrant is not required to bethread-safe.</p></blockquote><h4><a name="tag_03_578_04"></a>RETURN VALUE</h4><blockquote><p>Upon successful completion, <i>ptsname</i>() shall return a pointer to a string which is the name of the pseudo-terminal slavedevice. Upon failure, <i>ptsname</i>() shall return a null pointer. This could occur if <i>fildes</i> is an invalid file descriptoror if the slave device name does not exist in the file system.</p></blockquote><h4><a name="tag_03_578_05"></a>ERRORS</h4><blockquote><p>No errors are defined.</p></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_578_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_578_07"></a>APPLICATION USAGE</h4><blockquote><p>The value returned may point to a static data area that is overwritten by each call to <i>ptsname</i>().</p></blockquote><h4><a name="tag_03_578_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_578_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_578_10"></a>SEE ALSO</h4><blockquote><p><a href="grantpt.html"><i>grantpt</i>()</a> , <a href="open.html"><i>open</i>()</a> , <a href="ttyname.html"><i>ttyname</i>()</a> , <a href="unlockpt.html"><i>unlockpt</i>()</a> , the Base Definitions volume ofIEEE Std 1003.1-2001, <a href="../basedefs/stdlib.h.html"><i><stdlib.h></i></a></p></blockquote><h4><a name="tag_03_578_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 4, Version 2.</p></blockquote><h4><a name="tag_03_578_12"></a>Issue 5</h4><blockquote><p>Moved from X/OPEN UNIX extension to BASE.</p><p>A note indicating that this function need not be reentrant is added to the DESCRIPTION.</p></blockquote><div class="box"><em>End of informative text.</em></div><hr><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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