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MSYNC(2) BSD System Calls Manual MSYNC(2) NAME msync -- synchronize a mapped region LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <sys/mman.h> int msync(void *addr, size_t len, int flags); DESCRIPTION The msync() system call writes modified whole pages back to the filesystem and updates the file modifi-cation modification cation time. Only those pages containing addr and len-1 succeeding locations will be examined. The flags argument may be specified as follows: MS_ASYNC Return immediately MS_SYNC Perform synchronous writes MS_INVALIDATE Invalidate all cached data The MS_ASYNC flag is not permitted to be combined with other flags. RETURN VALUES If any errors occur, -1 is returned and errno is set to indicate the error. Otherwise, a 0 value is returned. ERRORS msync() will fail if: [EBUSY] Some of the specified addresses are locked and MS_INVALIDATE is specified. [EINVAL] addr is not a multiple of the hardware page size. [EINVAL] len is too large, or less than 1. [EINVAL] flags is invalid (e.g., it combines MS_ASYNC with another flag, which is not permit-ted). permitted). ted). [EIO] An I/O error occurs while writing to the file system. [ENOMEM] The specified address range is outside of the address range of the process or includes an unmapped page. LEGACY SYNOPSIS #include <sys/types.h> #include <sys/mman.h> The include file <sys/types.h> is necessary. SEE ALSO madvise(2), mincore(2), mprotect(2), munmap(2), compat(5) HISTORY The msync() function first appeared in 4.4BSD. BSD June 21, 1994 BSD |
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