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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-24 04:52:22 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-24 04:52:22 +0000
commit3d08cd331c1adcf0d917392f7e527b3f00511748 (patch)
tree312f0d1e1632f48862f044b8bb87e602dcffb5f9 /man3/stdio_ext.3
parentAdding debian version 6.7-2. (diff)
downloadmanpages-3d08cd331c1adcf0d917392f7e527b3f00511748.tar.xz
manpages-3d08cd331c1adcf0d917392f7e527b3f00511748.zip
Merging upstream version 6.8.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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-'\" t
-.\" Copyright (C) 2001 Andries Brouwer <aeb@cwi.nl>.
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH stdio_ext 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-__fbufsize, __flbf, __fpending, __fpurge, __freadable,
-__freading, __fsetlocking, __fwritable, __fwriting, _flushlbf \-
-interfaces to stdio FILE structure
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <stdio.h>
-.B #include <stdio_ext.h>
-.P
-.BI "size_t __fbufsize(FILE *" stream );
-.BI "size_t __fpending(FILE *" stream );
-.BI "int __flbf(FILE *" stream );
-.BI "int __freadable(FILE *" stream );
-.BI "int __fwritable(FILE *" stream );
-.BI "int __freading(FILE *" stream );
-.BI "int __fwriting(FILE *" stream );
-.BI "int __fsetlocking(FILE *" stream ", int " type );
-.B "void _flushlbf(void);"
-.BI "void __fpurge(FILE *" stream );
-.fi
-.SH DESCRIPTION
-Solaris introduced routines to allow portable access to the
-internals of the
-.I FILE
-structure, and glibc also implemented these.
-.P
-The
-.BR __fbufsize ()
-function returns the size of the buffer currently used
-by the given stream.
-.P
-The
-.BR __fpending ()
-function returns the number of bytes in the output buffer.
-For wide-oriented streams the unit is wide characters.
-This function is undefined on buffers in reading mode,
-or opened read-only.
-.P
-The
-.BR __flbf ()
-function returns a nonzero value if the stream is line-buffered,
-and zero otherwise.
-.P
-The
-.BR __freadable ()
-function returns a nonzero value if the stream allows reading,
-and zero otherwise.
-.P
-The
-.BR __fwritable ()
-function returns a nonzero value if the stream allows writing,
-and zero otherwise.
-.P
-The
-.BR __freading ()
-function returns a nonzero value if the stream is read-only, or
-if the last operation on the stream was a read operation,
-and zero otherwise.
-.P
-The
-.BR __fwriting ()
-function returns a nonzero value if the stream is write-only (or
-append-only), or if the last operation on the stream was a write
-operation, and zero otherwise.
-.P
-The
-.BR __fsetlocking ()
-function can be used to select the desired type of locking on the stream.
-It returns the current type.
-The
-.I type
-argument can take the following three values:
-.TP
-.B FSETLOCKING_INTERNAL
-Perform implicit locking around every operation on the given stream
-(except for the *_unlocked ones).
-This is the default.
-.TP
-.B FSETLOCKING_BYCALLER
-The caller will take care of the locking (possibly using
-.BR flockfile (3)
-in case there is more than one thread), and the stdio routines
-will not do locking until the state is reset to
-.BR FSETLOCKING_INTERNAL .
-.TP
-.B FSETLOCKING_QUERY
-Don't change the type of locking.
-(Only return it.)
-.P
-The
-.BR _flushlbf ()
-function flushes all line-buffered streams.
-(Presumably so that
-output to a terminal is forced out, say before reading keyboard input.)
-.P
-The
-.BR __fpurge ()
-function discards the contents of the stream's buffer.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface Attribute Value
-T{
-.na
-.nh
-.BR __fbufsize (),
-.BR __fpending (),
-.BR __fpurge (),
-.BR __fsetlocking ()
-T} Thread safety MT-Safe race:stream
-T{
-.na
-.nh
-.BR __flbf (),
-.BR __freadable (),
-.BR __freading (),
-.BR __fwritable (),
-.BR __fwriting (),
-.BR _flushlbf ()
-T} Thread safety MT-Safe
-.TE
-.SH SEE ALSO
-.BR flockfile (3),
-.BR fpurge (3)