umask man page on 4.4BSD

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

     umask — set file creation mode mask

     #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), 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.

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

     The umask() function is always successful.

     chmod(2), mknod(2), open(2)

     The umask() function call is expected to conform to IEEE Std 1003.1-1988

4th Berkeley Distribution	 June 4, 1993	     4th Berkeley Distribution

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