umask (2)

Leading comments

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(The comments found at the beginning of the groff file "man2/umask.2freebsd".)

NAME

umask - set file creation mode mask

LIBRARY

Lb libc

SYNOPSIS

In sys/stat.h Ft mode_t Fn umask mode_t numask

DESCRIPTION

The Fn umask routine sets the process's file mode creation mask to Fa numask and returns the previous value of the mask. The 9 low-order access permission bits of Fa numask are used by system calls, including open(2), mkdir(2), and mkfifo(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 Fn umask system call is always successful.

SEE ALSO

chmod(2), mkfifo(2), mknod(2), open(2)

STANDARDS

The Fn umask system call is expected to conform to St -p1003.1-90 .

HISTORY

The Fn umask function appeared in AT&T System v7 .