proc.5: Note kernel version for /proc/PID/smaps VmFlags "wf" flag

[thirdparty/man-pages.git] / man3 / getw.3

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.TH GETW 3  2016-03-15 "GNU" "Linux Programmer's Manual"
.SH NAME
getw, putw \- input and output of words (ints)
.SH SYNOPSIS
.nf
.B #include <stdio.h>
.PP
.BI "int getw(FILE *" stream );
.PP
.BI "int putw(int " w ", FILE *" stream );
.fi
.PP
.in -4n
Feature Test Macro Requirements for glibc (see
.BR feature_test_macros (7)):
.in
.PP
.BR getw (),
.BR putw ():
.ad l
.PD 0
.RS 4
.TP 4
Since glibc 2.3.3:
_XOPEN_SOURCE && ! (_POSIX_C_SOURCE\ >=\ 200112L)
    || /* Glibc since 2.19: */ _DEFAULT_SOURCE
    || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
.TP
Before glibc 2.3.3:
_SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE
.RE
.PD
.ad
.SH DESCRIPTION
.BR getw ()
reads a word (that is, an \fIint\fP) from \fIstream\fP.
It's provided for compatibility with SVr4.
We recommend you use
.BR fread (3)
instead.
.PP
.BR putw ()
writes the word \fIw\fP (that is,
an \fIint\fP) to \fIstream\fP.
It is provided for compatibility with SVr4, but we recommend you use
.BR fwrite (3)
instead.
.SH RETURN VALUE
Normally,
.BR getw ()
returns the word read, and
.BR putw ()
returns 0.
On error, they return \fBEOF\fP.
.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.TS
allbox;
lbw14 lb lb
l l l.
Interface	Attribute	Value
T{
.BR getw (),
.BR putw ()
T}	Thread safety	MT-Safe
.TE
.SH CONFORMING TO
SVr4, SUSv2.
Not present in POSIX.1.
.SH BUGS
The value returned on error is also a legitimate data value.
.BR ferror (3)
can be used to distinguish between the two cases.
.SH SEE ALSO
.BR ferror (3),
.BR fread (3),
.BR fwrite (3),
.BR getc (3),
.BR putc (3)