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Ref-docs/POSIX/susv3/functions/fputc.html
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Ref-docs/POSIX/susv3/functions/fputc.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta name="generator" content="HTML Tidy, see www.w3.org">
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 -->
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>fputc</title>
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</head>
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<body bgcolor="white">
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<script type="text/javascript" language="JavaScript" src="../jscript/codes.js">
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</script>
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<basefont size="3"> <a name="fputc"></a> <a name="tag_03_181"></a><!-- fputc -->
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<!--header start-->
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<center><font size="2">The Open Group Base Specifications Issue 6<br>
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IEEE Std 1003.1-2001<br>
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Copyright © 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
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<!--header end-->
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<hr size="2" noshade>
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<h4><a name="tag_03_181_01"></a>NAME</h4>
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<blockquote>fputc - put a byte on a stream</blockquote>
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<h4><a name="tag_03_181_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<p><code><tt>#include <<a href="../basedefs/stdio.h.html">stdio.h</a>><br>
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<br>
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int fputc(int</tt> <i>c</i><tt>, FILE *</tt><i>stream</i><tt>);<br>
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</tt></code></p>
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</blockquote>
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<h4><a name="tag_03_181_03"></a>DESCRIPTION</h4>
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<blockquote>
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<div class="box"><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]"
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border="0"> The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the
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requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers to
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the ISO C standard. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></div>
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<p>The <i>fputc</i>() function shall write the byte specified by <i>c</i> (converted to an <b>unsigned char</b>) to the output
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stream pointed to by <i>stream</i>, at the position indicated by the associated file-position indicator for the stream (if
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defined), and shall advance the indicator appropriately. If the file cannot support positioning requests, or if the stream was
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opened with append mode, the byte shall be appended to the output stream.</p>
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<p><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> The
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<i>st_ctime</i> and <i>st_mtime</i> fields of the file shall be marked for update between the successful execution of
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<i>fputc</i>() and the next successful completion of a call to <a href="../functions/fflush.html"><i>fflush</i>()</a> or <a href=
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"../functions/fclose.html"><i>fclose</i>()</a> on the same stream or a call to <a href="../functions/exit.html"><i>exit</i>()</a>
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or <a href="../functions/abort.html"><i>abort</i>()</a>. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></p>
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</blockquote>
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<h4><a name="tag_03_181_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>Upon successful completion, <i>fputc</i>() shall return the value it has written. Otherwise, it shall return EOF, the error
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indicator for the stream shall be set, <sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif"
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alt="[Option Start]" border="0"> and <i>errno</i> shall be set to indicate the error. <img src="../images/opt-end.gif" alt=
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"[Option End]" border="0"></p>
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</blockquote>
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<h4><a name="tag_03_181_05"></a>ERRORS</h4>
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<blockquote>
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<p>The <i>fputc</i>() function shall fail if either the <i>stream</i> is unbuffered or the <i>stream</i>'s buffer needs to be
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flushed, and:</p>
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<dl compact>
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<dt>[EAGAIN]</dt>
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<dd><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">
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The O_NONBLOCK flag is set for the file descriptor underlying <i>stream</i> and the process would be delayed in the write
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operation. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></dd>
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<dt>[EBADF]</dt>
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<dd><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">
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The file descriptor underlying <i>stream</i> is not a valid file descriptor open for writing. <img src="../images/opt-end.gif" alt=
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"[Option End]" border="0"></dd>
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<dt>[EFBIG]</dt>
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<dd><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> An
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attempt was made to write to a file that exceeds the maximum file size. <img src="../images/opt-end.gif" alt="[Option End]" border=
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"0"></dd>
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<dt>[EFBIG]</dt>
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<dd><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">
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An attempt was made to write to a file that exceeds the process' file size limit. <img src="../images/opt-end.gif" alt=
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"[Option End]" border="0"></dd>
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<dt>[EFBIG]</dt>
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<dd><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">
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The file is a regular file and an attempt was made to write at or beyond the offset maximum. <img src="../images/opt-end.gif" alt=
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"[Option End]" border="0"></dd>
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<dt>[EINTR]</dt>
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<dd><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">
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The write operation was terminated due to the receipt of a signal, and no data was transferred. <img src="../images/opt-end.gif"
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alt="[Option End]" border="0"></dd>
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<dt>[EIO]</dt>
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<dd><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> A
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physical I/O error has occurred, or the process is a member of a background process group attempting to write to its controlling
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terminal, TOSTOP is set, the process is neither ignoring nor blocking SIGTTOU, and the process group of the process is orphaned.
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This error may also be returned under implementation-defined conditions. <img src="../images/opt-end.gif" alt="[Option End]"
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border="0"></dd>
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<dt>[ENOSPC]</dt>
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<dd><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">
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There was no free space remaining on the device containing the file. <img src="../images/opt-end.gif" alt="[Option End]" border=
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"0"></dd>
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<dt>[EPIPE]</dt>
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<dd><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> An
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attempt is made to write to a pipe or FIFO that is not open for reading by any process. A SIGPIPE signal shall also be sent to the
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thread. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></dd>
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</dl>
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<p>The <i>fputc</i>() function may fail if:</p>
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<dl compact>
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<dt>[ENOMEM]</dt>
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<dd><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">
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Insufficient storage space is available. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></dd>
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<dt>[ENXIO]</dt>
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<dd><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> A
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request was made of a nonexistent device, or the request was outside the capabilities of the device. <img src=
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"../images/opt-end.gif" alt="[Option End]" border="0"></dd>
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</dl>
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</blockquote>
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<hr>
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<div class="box"><em>The following sections are informative.</em></div>
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<h4><a name="tag_03_181_06"></a>EXAMPLES</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_181_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_181_08"></a>RATIONALE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_181_09"></a>FUTURE DIRECTIONS</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_181_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="ferror.html"><i>ferror</i>()</a> , <a href="fopen.html"><i>fopen</i>()</a> , <a href=
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"getrlimit.html"><i>getrlimit</i>()</a> , <a href="putc.html"><i>putc</i>()</a> , <a href="puts.html"><i>puts</i>()</a> , <a href=
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"setbuf.html"><i>setbuf</i>()</a> , <a href="ulimit.html"><i>ulimit</i>()</a> , the Base Definitions volume of
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IEEE Std 1003.1-2001, <a href="../basedefs/stdio.h.html"><i><stdio.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_181_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 1. Derived from Issue 1 of the SVID.</p>
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</blockquote>
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<h4><a name="tag_03_181_12"></a>Issue 5</h4>
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<blockquote>
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<p>Large File Summit extensions are added.</p>
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</blockquote>
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<h4><a name="tag_03_181_13"></a>Issue 6</h4>
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<blockquote>
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<p>Extensions beyond the ISO C standard are marked.</p>
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<p>The following new requirements on POSIX implementations derive from alignment with the Single UNIX Specification:</p>
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<ul>
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<li>
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<p>The [EIO] and [EFBIG] mandatory error conditions are added.</p>
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</li>
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<li>
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<p>The [ENOMEM] and [ENXIO] optional error conditions are added.</p>
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</li>
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</ul>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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<hr>
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<hr size="2" noshade>
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<center><font size="2"><!--footer start-->
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UNIX ® is a registered Trademark of The Open Group.<br>
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POSIX ® is a registered Trademark of The IEEE.<br>
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[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href=
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"../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>
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]</font></center>
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</html>
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