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Command: umask | Section: 2 | Source: NetBSD | File: umask.2
UMASK(2) FreeBSD System Calls Manual UMASK(2)
NAME
umask - set file creation mode mask
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/stat.h>
mode_t
umask(mode_t numask);
DESCRIPTION
The umask() routine sets the process's file mode creation mask to numask
and returns the previous value of the mask. The 9 low-order access
permission bits of numask are used by system calls, including open(2),
mkdir(2), mkfifo(2) and mknod(2) to turn off corresponding bits requested
in file mode. (See chmod(2)). This clearing allows each user to
restrict the default access to his files.
The default mask value is S_IWGRP|S_IWOTH (022, write access for the
owner only). Child processes inherit the mask of the calling process.
RETURN VALUES
The previous value of the file mode mask is returned by the call.
ERRORS
The umask() function is always successful.
SEE ALSO
chmod(2), mkdir(2), mkfifo(2), mknod(2), open(2)
STANDARDS
The umask() function conforms to IEEE Std 1003.1-1990 ("POSIX.1").
FreeBSD 14.1-RELEASE-p8 June 4, 1993 FreeBSD 14.1-RELEASE-p8