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UMASK(2)		       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 permis-
     sion bits of 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 umask() system call is always successful.

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

STANDARDS
     The  umask()  system  call  is  expected  to conform to ISO/IEC 9945-1:1990
     ("POSIX.1").

HISTORY
     The umask() function appeared in Version 7 AT&T UNIX.

FreeBSD ports 15.1		  June 4, 1993				UMASK(2)

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