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Man Pages
UMASK(2) FreeBSD System Calls Manual UMASK(2)

umask
set file creation mode mask

Standard C Library (libc, -lc)

#include <sys/stat.h>
mode_t
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 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.

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

The umask() system call is always successful.

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

The umask() system call is expected to conform to IEEE Std 1003.1-1990 (“POSIX.1”).

The umask() function appeared in Version 7 AT&T UNIX.
June 4, 1993 FreeBSD 12.0-RELEASE

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