man/man2/umask.2

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 umask 2 "28 Dec 1996" "SunOS 5.11" "System Calls"
 NAME
umask - set and get file creation mask
 SYNOPSIS

#include <sys/types.h>
#include <sys/stat.h>

mode_t umask(mode_t cmask);


 DESCRIPTION

The umask() function sets the process's file mode creation mask to
cmask and returns the previous value of the mask. Only the access
permission bits of cmask and the file mode creation mask are used. The
mask is inherited by child processes. See Intro(2) for more information
on masks.
 RETURN VALUES

The previous value of the file mode creation mask is returned.
 ATTRIBUTES

See attributes(5) for descriptions of the following attributes:


ATTRIBUTE TYPEATTRIBUTE VALUE
Interface StabilityStandard
MT-LevelAsync-Signal-Safe


 SEE ALSO

mkdir(1), sh(1), Intro(2), chmod(2), creat(2),
mknod(2), open(2), stat.h(3HEAD), attributes(5),
standards(5)

ATTRIBUTE TYPE	ATTRIBUTE VALUE
Interface Stability	Standard
MT-Level	Async-Signal-Safe