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RocketLink!--> Man page versions: OpenBSD FreeBSD NetBSD RedHat Solaris Others

UMASK(2)                  OpenBSD Programmer's Manual                 UMASK(2)

     umask - set file creation mode mask

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

     umask(mode_t numask);

     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 per-
     mission bits of numask are used by system calls, including open(2),
     mkdir(2),  mkfifo(2) and mknod(2) to turn off corresponding bits request-
     ed in file mode.  (See chmod(2)).  This clearing allows each user to re-
     strict the default access to his files.

     The default mask value is S_IWGRP|S_IWOTH (022, write access for the own-
     er only).  Child processes inherit the mask of the calling process.

     The previous value of the file mode mask is returned by the call.

     The umask() function is always successful.

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

     The umask() function call is expected to conform to IEEE Std1003.1-1988

OpenBSD 2.6                      June 4, 1993                                1

Source: OpenBSD 2.6 man pages. Copyright: Portions are copyrighted by BERKELEY
SOFTWARE DESIGN, INC., The Regents of the University of California, Massachusetts
Institute of Technology, Free Software Foundation, FreeBSD Inc., and others.

(Corrections, notes, and links courtesy of RocketAware.com)

[Detailed Topics]

[Overview Topics]

Up to: File Access Limits - Limiting access to files (permissions, locking, et al)
Up to: Process Limits: File Access - Process Limits on File access (permissions, ownership, modes, et al)

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