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Linux 2.6 - man page for fdatasync (linux section 3)

FDATASYNC(P)						     POSIX Programmer's Manual						      FDATASYNC(P)

NAME
fdatasync - synchronize the data of a file (REALTIME)
SYNOPSIS
#include <unistd.h> int fdatasync(int fildes);
DESCRIPTION
The fdatasync() function shall force all currently queued I/O operations associated with the file indicated by file descriptor fildes to the synchronized I/O completion state. The functionality shall be equivalent to fsync() with the symbol _POSIX_SYNCHRONIZED_IO defined, with the exception that all I/O operations shall be completed as defined for synchronized I/O data integrity completion.
RETURN VALUE
If successful, the fdatasync() function shall return the value 0; otherwise, the function shall return the value -1 and set errno to indi- cate the error. If the fdatasync() function fails, outstanding I/O operations are not guaranteed to have been completed.
ERRORS
The fdatasync() function shall fail if: EBADF The fildes argument is not a valid file descriptor open for writing. EINVAL This implementation does not support synchronized I/O for this file. In the event that any of the queued I/O operations fail, fdatasync() shall return the error conditions defined for read() and write(). The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
aio_fsync() , fcntl() , fsync() , open() , read() , write() , the Base Definitions volume of IEEE Std 1003.1-2001, <unistd.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE
/The Open Group 2003 FDATASYNC(P)