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NAMEumask - set file creation mode mask
SYNOPSISIn sys/stat.h Ft mode_t Fn umask mode_t numask
DESCRIPTIONThe 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 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.