221 lines
5.0 KiB
HTML
221 lines
5.0 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 STDIO_EXT</TITLE>
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</HEAD><BODY>
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<H1>STDIO_EXT</H1>
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Section: Linux Programmer's Manual (3)<BR>Updated: 2015-03-02<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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__fbufsize, __flbf, __fpending, __fpurge, __freadable,
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__freading, __fsetlocking, __fwritable, __fwriting, _flushlbf -
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interfaces to stdio FILE structure
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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/stdio.h">stdio.h</A>></B>
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<B>#include <<A HREF="file:///usr/include/stdio_ext.h">stdio_ext.h</A>></B>
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<B>size_t __fbufsize(FILE *</B><I>stream</I><B>);</B>
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<B>size_t __fpending(FILE *</B><I>stream</I><B>);</B>
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<B>int __flbf(FILE *</B><I>stream</I><B>);</B>
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<B>int __freadable(FILE *</B><I>stream</I><B>);</B>
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<B>int __fwritable(FILE *</B><I>stream</I><B>);</B>
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<B>int __freading(FILE *</B><I>stream</I><B>);</B>
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<B>int __fwriting(FILE *</B><I>stream</I><B>);</B>
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<B>int __fsetlocking(FILE *</B><I>stream</I><B>, int </B><I>type</I><B>);</B>
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<B>void _flushlbf(void);</B>
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<B>void __fpurge(FILE *</B><I>stream</I><B>);</B>
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</PRE>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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Solaris introduced routines to allow portable access to the
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internals of the
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<I>FILE</I>
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structure, and glibc also implemented these.
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<P>
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The
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<B>__fbufsize</B>()
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function returns the size of the buffer currently used
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by the given stream.
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<P>
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The
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<B>__fpending</B>()
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function returns the number of bytes in the output buffer.
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For wide-oriented streams the unit is wide characters.
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This function is undefined on buffers in reading mode,
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or opened read-only.
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<P>
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The
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<B>__flbf</B>()
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function returns a nonzero value if the stream is line-buffered,
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and zero otherwise.
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<P>
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The
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<B>__freadable</B>()
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function returns a nonzero value if the stream allows reading,
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and zero otherwise.
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<P>
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The
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<B>__fwritable</B>()
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function returns a nonzero value if the stream allows writing,
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and zero otherwise.
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<P>
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The
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<B>__freading</B>()
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function returns a nonzero value if the stream is read-only, or
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if the last operation on the stream was a read operation,
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and zero otherwise.
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<P>
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The
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<B>__fwriting</B>()
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function returns a nonzero value if the stream is write-only (or
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append-only), or if the last operation on the stream was a write
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operation, and zero otherwise.
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<P>
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The
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<B>__fsetlocking</B>()
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function can be used to select the desired type of locking on the stream.
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It returns the current type.
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The
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<I>type</I>
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argument can take the following three values:
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<DL COMPACT>
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<DT id="1"><B>FSETLOCKING_INTERNAL</B>
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<DD>
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Perform implicit locking around every operation on the given stream
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(except for the *_unlocked ones).
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This is the default.
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<DT id="2"><B>FSETLOCKING_BYCALLER</B>
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<DD>
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The caller will take care of the locking (possibly using
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<B><A HREF="/cgi-bin/man/man2html?3+flockfile">flockfile</A></B>(3)
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in case there is more than one thread), and the stdio routines
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will not do locking until the state is reset to
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<B>FSETLOCKING_INTERNAL</B>.
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<DT id="3"><B>FSETLOCKING_QUERY</B>
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<DD>
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Don't change the type of locking.
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(Only return it.)
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</DL>
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<P>
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The
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<B>_flushlbf</B>()
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function flushes all line-buffered streams.
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(Presumably so that
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output to a terminal is forced out, say before reading keyboard input.)
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<P>
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The
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<B>__fpurge</B>()
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function discards the contents of the stream's buffer.
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<A NAME="lbAE"> </A>
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<H2>ATTRIBUTES</H2>
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For an explanation of the terms used in this section, see
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<B><A HREF="/cgi-bin/man/man2html?7+attributes">attributes</A></B>(7).
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<TABLE BORDER>
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<TR VALIGN=top><TD><B>Interface</B></TD><TD><B>Attribute</B></TD><TD><B>Value</B><BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>__fbufsize</B>(),
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<B>__fpending</B>(),
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<BR>
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<B>__fpurge</B>(),
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<B>__fsetlocking</B>()
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</TD><TD>Thread safety</TD><TD>MT-Safe race:stream<BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>__flbf</B>(),
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<B>__freadable</B>(),
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<BR>
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<B>__freading</B>(),
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<B>__fwritable</B>(),
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<BR>
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<B>__fwriting</B>(),
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<B>_flushlbf</B>()
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</TD><TD>Thread safety</TD><TD>MT-Safe<BR></TD></TR>
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</TABLE>
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<A NAME="lbAF"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?3+flockfile">flockfile</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+fpurge">fpurge</A></B>(3)
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<A NAME="lbAG"> </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">ATTRIBUTES</A><DD>
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<DT id="8"><A HREF="#lbAF">SEE ALSO</A><DD>
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<DT id="9"><A HREF="#lbAG">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: 00:05:57 GMT, March 31, 2021
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