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

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

.\" Copyright (C) 2002 Andries Brouwer <aeb@cwi.nl>
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.\" This replaces an earlier man page written by Walter Harms
.\" <walter.harms@informatik.uni-oldenburg.de>.
.\"
.TH GETUMASK 3 2017-09-15 "GNU" "Linux Programmer's Manual"
.SH NAME
getumask \- get file creation mask
.SH SYNOPSIS
.BR "#define _GNU_SOURCE" "             /* See feature_test_macros(7) */"
.br
.B "#include <sys/types.h>"
.br
.B "#include <sys/stat.h>"
.PP
.B "mode_t getumask(void);"
.SH DESCRIPTION
This function returns the current file creation mask.
It is equivalent to
.PP
.in +4n
.EX
mode_t getumask(void)
{
    mode_t mask = umask( 0 );
    umask(mask);
    return mask;
}
.EE
.in
.PP
except that it is documented to be thread-safe (that is, shares
a lock with the
.BR umask (2)
library call).
.SH CONFORMING TO
This is a vaporware GNU extension.
.SH NOTES
This function is documented in the glibc manual, but,
as at glibc version 2.24, it is not implemented on Linux.
(See
.BR umask (2)
for a thread-safe method of discovering a process's umask.)
.SH SEE ALSO
.BR umask (2)