|UMASK(2)||FreeBSD System Calls Manual||UMASK(2)|
NAMEumask — set file creation mode mask
LIBRARYStandard C Library (libc, -lc)
SYNOPSIS#include < sys/stat.h>
umask( mode_t numask);
DESCRIPTIONThe 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), 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.
RETURN VALUESThe previous value of the file mode mask is returned by the call.
ERRORSThe umask() system call is always successful.
STANDARDSThe umask() system call is expected to conform to IEEE Std 1003.1-1990 (“POSIX.1”).
HISTORYThe umask() function appeared in Version 7 AT&T UNIX.
|June 4, 1993||FreeBSD|