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!!NAME msync - synchronize a file with a memory map !!SYNOPSIS __#include <unistd.h>__ __#include <sys/mman.h>__ __#ifdef _POSIX_MAPPED_FILES__ __#ifdef _POSIX_SYNCHRONIZED_IO__ __int msync(const void *__''start''__, size_t__ ''length''__, int__ ''flags''__);__ __#endif__ __#endif__ !!DESCRIPTION __msync__ flushes changes made to the in-core copy of a file that was mapped into memory using mmap(2) back to disk. Without use of this call there is no guarantee that changes are written back before munmap(2) is called. To be more precise, the part of the file that corresponds to the memory area starting at ''start'' and having length ''length'' is updated. The ''flags'' argument may have the bits MS_ASYNC, MS_SYNC and MS_INVALIDATE set, but not both MS_ASYNC and MS_SYNC. MS_ASYNC specifies that an update be scheduled, but the call returns immediately. MS_SYNC asks for an update and waits for it to complete. MS_INVALIDATE asks to invalidate other mappings of the same file (so that they can be updated with the fresh values just written). !!RETURN VALUE On success, zero is returned. On error, -1 is returned, and ''errno'' is set appropriately. !!ERRORS ;[EINVAL]: ''start'' is not a multiple of PAGESIZE, or any bit other than MS_ASYNC | MS_INVALIDATE | MS_SYNC is set in ''flags.'' ;[EFAULT]: The indicated memory (or part of it) was not mapped. !!CONFORMING TO POSIX.1b (formerly POSIX.4) !!SEE ALSO mmap(2), B.O. Gallmeister, POSIX.4, O'Reilly, pp. 128-129 and 389-391.
5 pages link to
msync(2)
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Man2m
syscalls(2)
mmap(2)
munmap(2)
madvise(2)
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