|MSYNC(2)||System Calls Manual||MSYNC(2)|
synchronize a mapped region
*addr, size_t len,
msync() system call writes all pages
with shared modifications in the specified region starting from
addr and continuing for len
bytes. addr should be a multiple of the page size. 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
The flags argument is the bitwise OR of zero or more of the following values:
MS_ASYNC Perform asynchronous writes. MS_SYNC Perform synchronous writes. MS_INVALIDATE Invalidate cached data after writing.
Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the error.
The following errors may be reported:
MS_INVALIDATEflag was specified and a portion of the specified region was locked with mlock(2).
msync() function first appeared in
SunOS 4.0 and has been available since 4.4BSD. It
was modified to conform to IEEE Std 1003.1b-1993
Writes are currently done synchronously even if the
MS_ASYNC flag is specified.
|December 10, 2019||OpenBSD-current|