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umask(2)                    BSD System Calls Manual                   umask(2)


NAME

     umask -- set file creation mode mask


SYNOPSIS

     #include <sys/stat.h>

     mode_t
     umask(mode_t cmask);


DESCRIPTION

     The umask() routine sets the process's file mode creation mask to cmask
     and returns the previous value of the mask.  The 9 low-order access per-
     mission bits of cmask 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.


LEGACY SYNOPSIS

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

     The include file <sys/types.h> is necessary.


SEE ALSO

     chmod(2), mkdir(2), mkfifo(2), mknod(2), open(2), compat(5)


STANDARDS

     The umask() function call is expected to conform to IEEE Std 1003.1-1988
     (``POSIX.1'').

4th Berkeley Distribution        June 4, 1993        4th Berkeley Distribution

Mac OS X 10.9.1 - Generated Mon Jan 6 18:34:41 CST 2014
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