Module sys_file 

sys/file.h implementation.

Non-POSIX, see https://man7.org/linux/man-pages/man2/flock.2.html.

Constants

LOCK_EX

Place an exclusive lock.

LOCK_NB

To make a nonblocking request, include LOCK_NB (by ORing) with any of LOCK_SH, LOCK_EX and LOCK_UN.

LOCK_SH

Place a shared lock.

LOCK_UN

Remove an existing lock held by this process.

L_INCR

L_SET

L_XTND

Functions

flock

See https://man7.org/linux/man-pages/man2/flock.2.html.