man/man2/umask.2

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 UMASK 2 "Dec 28, 1996"
 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(7) for descriptions of the following attributes:


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


 SEE ALSO

 mkdir (1),  sh (1),  Intro (2),  chmod (2),  creat (2),  mknod (2),  open (2),  stat.h (3HEAD),  attributes (7),  standards (7)