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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) 2001-2004 IEEE and The Open Group, All Rights Reserved --><title>ttyname</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="ttyname"></a> <a name="tag_03_793"></a><!-- ttyname --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2004 Edition<br>Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_03_793_01"></a>NAME</h4><blockquote>ttyname, ttyname_r - find the pathname of a terminal</blockquote><h4><a name="tag_03_793_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><p><code><tt>#include <<a href="../basedefs/unistd.h.html">unistd.h</a>><br><br> char *ttyname(int</tt> <i>fildes</i><tt>);<br></tt></code></p><div class="box"><code><tt><sup>[<a href="javascript:open_code('TSF')">TSF</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> int ttyname_r(int</tt> <i>fildes</i><tt>, char *</tt><i>name</i><tt>, size_t</tt><i>namesize</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_793_03"></a>DESCRIPTION</h4><blockquote><p>The <i>ttyname</i>() function shall return a pointer to a string containing a null-terminated pathname of the terminalassociated with file descriptor <i>fildes</i>. The return value may point to static data whose content is overwritten by eachcall.</p><p>The <i>ttyname</i>() function need not be reentrant. A function that is not required to be reentrant is not required to bethread-safe.</p><p><sup>[<a href="javascript:open_code('TSF')">TSF</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">The <i>ttyname_r</i>() function shall store the null-terminated pathname of the terminal associated with the file descriptor<i>fildes</i> in the character array referenced by <i>name</i>. The array is <i>namesize</i> characters long and should have spacefor the name and the terminating null character. The maximum length of the terminal name shall be {TTY_NAME_MAX}. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></p></blockquote><h4><a name="tag_03_793_04"></a>RETURN VALUE</h4><blockquote><p>Upon successful completion, <i>ttyname</i>() shall return a pointer to a string. Otherwise, a null pointer shall be returned and<i>errno</i> set to indicate the error.</p><p><sup>[<a href="javascript:open_code('TSF')">TSF</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">If successful, the <i>ttyname_r</i>() function shall return zero. Otherwise, an error number shall be returned to indicate theerror. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></p></blockquote><h4><a name="tag_03_793_05"></a>ERRORS</h4><blockquote><p>The <i>ttyname</i>() function may fail if:</p><dl compact><dt>[EBADF]</dt><dd>The <i>fildes</i> argument is not a valid file descriptor.</dd><dt>[ENOTTY]</dt><dd>The <i>fildes</i> argument does not refer to a terminal.</dd></dl><p>The <i>ttyname_r</i>() function may fail if:</p><dl compact><dt>[EBADF]</dt><dd><sup>[<a href="javascript:open_code('TSF')">TSF</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">The <i>fildes</i> argument is not a valid file descriptor. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></dd><dt>[ENOTTY]</dt><dd><sup>[<a href="javascript:open_code('TSF')">TSF</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">The <i>fildes</i> argument does not refer to a terminal. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></dd><dt>[ERANGE]</dt><dd><sup>[<a href="javascript:open_code('TSF')">TSF</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">The value of <i>namesize</i> is smaller than the length of the string to be returned including the terminating null character. <imgsrc="../images/opt-end.gif" alt="[Option End]" border="0"></dd></dl></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_793_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_793_07"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_793_08"></a>RATIONALE</h4><blockquote><p>The term ``terminal'' is used instead of the historical term ``terminal device'' in order to avoid a reference to an undefinedterm.</p><p>The thread-safe version places the terminal name in a user-supplied buffer and returns a non-zero value if it fails. Thenon-thread-safe version may return the name in a static data area that may be overwritten by each call.</p></blockquote><h4><a name="tag_03_793_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_793_10"></a>SEE ALSO</h4><blockquote><p>The Base Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/unistd.h.html"><i><unistd.h></i></a></p></blockquote><h4><a name="tag_03_793_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 1. Derived from Issue 1 of the SVID.</p></blockquote><h4><a name="tag_03_793_12"></a>Issue 5</h4><blockquote><p>The <i>ttyname_r</i>() function is included for alignment with the POSIX Threads Extension.</p><p>A note indicating that the <i>ttyname</i>() function need not be reentrant is added to the DESCRIPTION.</p></blockquote><h4><a name="tag_03_793_13"></a>Issue 6</h4><blockquote><p>The <i>ttyname_r</i>() function is marked as part of the Thread-Safe Functions option.</p><p>The following new requirements on POSIX implementations derive from alignment with the Single UNIX Specification:</p><ul><li><p>The statement that <i>errno</i> is set on error is added.</p></li><li><p>The [EBADF] and [ENOTTY] optional error conditions are added.</p></li></ul></blockquote><div class="box"><em>End of informative text.</em></div><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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