Вызов команды MAN fsync

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FSYNC(2)		  FreeBSD System Calls Manual		      FSYNC(2)

NAME
     fsync -- synchronise changes to a file

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <unistd.h>

     int
     fsync(int fd);

DESCRIPTION
     Fsync() causes all modified data and attributes of fd to be moved to a
     permanent storage device.	This normally results in all in-core modified
     copies of buffers for the associated file to be written to a disk.

     Fsync() should be used by programs that require a file to be in a known
     state, for example, in building a simple transaction facility.

RETURN VALUES
     The fsync() function returns the value 0 if successful; otherwise the
     value -1 is returned and the global variable errno is set to indicate the
     error.

ERRORS
     The fsync() fails if:

     [EBADF]		fd is not a valid descriptor.

     [EINVAL]		fd refers to a socket, not to a file.

     [EIO]		An I/O error occurred while reading from or writing to
			the file system.

SEE ALSO
     sync(2), syncer(4), sync(8)

HISTORY
     The fsync() function call appeared in 4.2BSD.

FreeBSD 4.9			 June 4, 1993			   FreeBSD 4.9