umask.2 revision 1574
Copyright (c) 1980, 1991, 1993
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This product includes software developed by the University of
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THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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@(#)umask.2 8.1 (Berkeley) 6/4/93
.Dd June 4, 1993 .Dt UMASK 2 .Os BSD 4 .Sh NAME .Nm umask .Nd set file creation mode mask .Sh SYNOPSIS .Fd #include <sys/stat.h> .Ft mode_t .Fn umask "mode_t numask" .Sh 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 .Xr open 2 , .Xr mkdir 2 , and .Xr mkfifo 2 , to turn off corresponding bits requested in file mode. (See .Xr chmod 2 ) . This clearing allows each user to restrict the default access to his files.
The Regents of the University of California. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this software
must display the following acknowledgement:
This product includes software developed by the University of
California, Berkeley and its contributors.
4. Neither the name of the University nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
@(#)umask.2 8.1 (Berkeley) 6/4/93
.Dd June 4, 1993 .Dt UMASK 2 .Os BSD 4 .Sh NAME .Nm umask .Nd set file creation mode mask .Sh SYNOPSIS .Fd #include <sys/stat.h> .Ft mode_t .Fn umask "mode_t numask" .Sh 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 .Xr open 2 , .Xr mkdir 2 , and .Xr mkfifo 2 , to turn off corresponding bits requested in file mode. (See .Xr chmod 2 ) . This clearing allows each user to restrict the default access to his files.
p 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. .Sh RETURN VALUES The previous value of the file mode mask is returned by the call. .Sh ERRORS The .Fn umask function is always successful. .Sh SEE ALSO .Xr chmod 2 , .Xr mknod 2 , .Xr open 2 .Sh STANDARDS The .Fn umask function call is expected to conform to IEEE Std 1003.1-1988
q Dq Tn POSIX .