lockf()
from unistd.h
is required to build xbps
https://man7.org/linux/man-pages/man3/lockf.3p.html
DESCRIPTIONThe lockf() function shall lock sections of a file with advisory- mode locks. Calls to lockf() from threads in other processes which attempt to lock the locked file section shall either return an error value or block until the section becomes unlocked. All the locks for a process are removed when the process terminates. Record locking with lockf() shall be supported for regular files and may be supported for other files.
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