160 lines
3.4 KiB
HTML
160 lines
3.4 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of ISFDTYPE</TITLE>
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</HEAD><BODY>
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<H1>ISFDTYPE</H1>
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Section: Linux Programmer's Manual (3)<BR>Updated: 2014-03-13<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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isfdtype - test file type of a file descriptor
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<PRE>
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<B>#include <<A HREF="file:///usr/include/sys/stat.h">sys/stat.h</A>></B>
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<B>#include <<A HREF="file:///usr/include/sys/socket.h">sys/socket.h</A>></B>
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<B>int isfdtype(int </B><I>fd</I><B>, int </B><I>fdtype</I><B>);</B>
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</PRE>
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<P>
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Feature Test Macro Requirements for glibc (see
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<B><A HREF="/cgi-bin/man/man2html?7+feature_test_macros">feature_test_macros</A></B>(7)):
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<P>
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<B>isfdtype</B>():
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<DL COMPACT><DT id="1"><DD>
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<DL COMPACT>
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<DT id="2">Since glibc 2.20:<DD>
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_DEFAULT_SOURCE
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<DT id="3">Before glibc 2.20:<DD>
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_BSD_SOURCE || _SVID_SOURCE
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</DL>
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</DL>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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The
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<B>isfdtype</B>()
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function tests whether the file descriptor
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<I>fd</I>
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refers to a file of type
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<I>fdtype</I>.
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The
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<I>fdtype</I>
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argument specifies one of the
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<B>S_IF*</B>
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constants defined in
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<I><<A HREF="file:///usr/include/sys/stat.h">sys/stat.h</A>></I>
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and documented in
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<B><A HREF="/cgi-bin/man/man2html?2+stat">stat</A></B>(2)
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(e.g.,
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<B>S_IFREG</B>).
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<A NAME="lbAE"> </A>
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<H2>RETURN VALUE</H2>
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The
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<B>isfdtype</B>()
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function returns 1 if the file descriptor
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<I>fd</I>
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is of type
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<I>fdtype</I>
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and 0 if it is not.
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On error, -1 is returned and
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<I>errno</I>
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is set to indicate the cause.
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<A NAME="lbAF"> </A>
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<H2>ERRORS</H2>
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The
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<B>isfdtype</B>()
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function can fail with any of the same errors as
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<B><A HREF="/cgi-bin/man/man2html?3+fstat">fstat</A></B>(3).
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<A NAME="lbAG"> </A>
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<H2>CONFORMING TO</H2>
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The
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<B>isfdtype</B>()
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function is not specified in any standard,
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but did appear in the draft POSIX.1g standard.
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It is present on OpenBSD and Tru64 UNIX
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(where the required header file in both cases is just
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<I><<A HREF="file:///usr/include/sys/stat.h">sys/stat.h</A>></I>,
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as shown in the POSIX.1g draft),
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and possibly other systems.
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<A NAME="lbAH"> </A>
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<H2>NOTES</H2>
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Portable applications should use
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<B><A HREF="/cgi-bin/man/man2html?3+fstat">fstat</A></B>(3)
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instead.
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<A NAME="lbAI"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?3+fstat">fstat</A></B>(3)
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<A NAME="lbAJ"> </A>
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<H2>COLOPHON</H2>
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This page is part of release 5.05 of the Linux
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<I>man-pages</I>
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="4"><A HREF="#lbAB">NAME</A><DD>
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<DT id="5"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="6"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="7"><A HREF="#lbAE">RETURN VALUE</A><DD>
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<DT id="8"><A HREF="#lbAF">ERRORS</A><DD>
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<DT id="9"><A HREF="#lbAG">CONFORMING TO</A><DD>
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<DT id="10"><A HREF="#lbAH">NOTES</A><DD>
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<DT id="11"><A HREF="#lbAI">SEE ALSO</A><DD>
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<DT id="12"><A HREF="#lbAJ">COLOPHON</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:46 GMT, March 31, 2021
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</BODY>
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</HTML>
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