mask(2) - phpMan

BN_mask_bits (3ssl)  - bit operations on BIGNUMs
getumask (3)         - get file creation mask
keyctl_setperm (3)   - change the permissions mask on a key
pam_umask (8)        - PAM module to set the file mode creation mask
posix_spawnattr_getsigmask (3p) - get and set the spawn-sigmask attribute of ...
posix_spawnattr_setsigmask (3p) - set the spawn-sigmask attribute of a spawn ...
pthread_sigmask (3)  - examine and change mask of blocked signals
pthread_sigmask (3p) - examine and change blocked signals
rt_sigprocmask (2)   - examine and change blocked signals
sched_getaffinity (2) - set and get a thread's CPU affinity mask
sched_setaffinity (2) - set and get a thread's CPU affinity mask
setlogmask (3)       - set log priority mask
setlogmask (3p)      - set the log priority mask
sgetmask (2)         - manipulation of signal mask (obsolete)
siggetmask (3)       - BSD signal API
sigmask (3)          - BSD signal API
sigpause (3p)        - remove a signal from the signal mask and suspend the t...
sigprocmask (2)      - examine and change blocked signals
sigprocmask (3p)     - examine and change blocked signals
sigsetmask (3)       - BSD signal API
ssetmask (2)         - manipulation of signal mask (obsolete)
systemd-debug-generator (8) - Generator for enabling a runtime debug shell an...
umask (1)            - bash built-in commands, see bash(1)
umask (1p)           - get or set the file mode creation mask
umask (2)            - set file mode creation mask
umask (3p)           - set and get the file mode creation mask