MSYNC(2)

NAME
msync - synchronize a mapped region

SYNOPSIS
msync(addr, len)
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 examined. 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
msync.2, munmap.2, mprotect.2, madvise.2, mincore.2