umask - set and get file creation mask
mode_t umask(mode_t cmask);
umask() sets the process's file mode creation mask to umask() and
returns the previous value of the mask. Only the file access
permission bits of the masks are used.
The bits set in cmask specify which permission bits to turn off in the
mode of the created file, and should be specified using the symbolic
values defined in stat(5).
The following creates a file named path in the current directory with
permissions S_IRWXU|S_IRGRP|S_IXGRP, so that the file can be written
only by its owner, and can be read or executed only by the owner or
processes with group permission, even though group write permission
and all permissions for others are passed in to creat().
fildes = creat("path", S_IRWXU|S_IRWXG|S_IRWXO);
The previous value of the file mode creation mask is returned.
mkdir(1), sh(1), mknod(1M), chmod(2), creat(2), mknod(2), open(2).
umask(): AES, SVID2, SVID3, XPG2, XPG3, XPG4, FIPS 151-2, POSIX.1
Hewlett-Packard Company - 1 - HP-UX Release 11i: November 2000