mlock(3C)
lock (or unlock) pages in memory
From the original Amiga UNIX 2.1 manual. Some things it mentions may not be in this release.
NAME
mlock, munlock - lock (or unlock) pages in memory
SYNOPSIS
#include <sys/types.h> int mlock(caddr_t addr, size_t len); int munlock(caddr_t addr, size_t len);
DESCRIPTION
The function mlock uses the mappings established for the address range [addr, addr + len) to identify pages to be locked in memory. The effect of mlock(addr, len) is equivalent to memcntl(addr, len, MC_LOCK, 0, 0, 0). munlock removes locks established with mlock. The effect of munlock(addr, len) is equivalent to memcntl(addr, len, MC_UNLOCK, 0, 0, 0). Locks established with mlock are not inherited by a child process after a fork and are not nested.
SEE ALSO
fork(2), memcntl(2), mmap(2), mlockall(3C), plock(2), sysconf(3C).
DIAGNOSTICS
Upon successful completion, the functions mlock and munlock return 0; otherwise, they return -1 and set errno to indicate the error.
NOTES
Use of mlock and munlock requires that the user have appropriate privileges.