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MSYNC(2)						      BSD System Calls Manual							  MSYNC(2)

msync -- synchronize a mapped region LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <sys/types.h> #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 modification time. Only those pages contain- ing 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: [EINVAL] addr is not a multiple of the hardware page size. [EINVAL] len is too large, or less than 1. [EINVAL] flags combined MS_ASYNC with another flag, which is not permitted. [EIO] An I/O error occurred while writing to the file system. SEE ALSO
madvise(2), mincore(2), mprotect(2), munmap(2) HISTORY
The msync() function first appeared in 4.4BSD. BSD
June 21, 1994 BSD

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