MSYNC(2) MachTen Programmer’s Manual MSYNC(2)

NAME
msync - synchronize a mapped region

SYNOPSIS
msync(caddr_t addr, int len)

DESCRIPTION
The msync() system call writes any modified pages back to the filesystem
and updates the file modification time. If len is 0, all modified pages
within the region containing addr will be flushed; if len is non-zero,
only the pages containing addr and len succeeding locations will be exam-
ined. Any required synchronization of memory caches will also take place
at this time. Filesystem operations on a file that is mapped for shared
modifications are unpredictable except after an msync().

SEE ALSO
madvise(2), munmap(2), mprotect(2), mincore(2)

HISTORY
The msync() function first appeared in 4.4BSD.

4.4BSD June 9, 1993 1