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OpenDarwin 7.2.1 - man page for umask (opendarwin section 2)

UMASK(2)				       BSD System Calls Manual					     UMASK(2)

NAME
umask -- set file creation mode mask
SYNOPSIS
#include <sys/types.h> #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 permission bits of numask 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.
SEE ALSO
chmod(2), mkdir(2), mkfifo(2), mknod(2), open(2)
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


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