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NetBSD 6.1.5 - man page for fdatasync (netbsd section 2)

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FDATASYNC(2)			     BSD System Calls Manual			     FDATASYNC(2)

NAME
     fdatasync -- synchronize the data of a file

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <unistd.h>

     int
     fdatasync(int fd);

DESCRIPTION
     The fdatasync() function forces all modified data associated with the file descriptor fd to
     be flushed to stable storage.

     The functionality is as described for fsync(2), with the exception that file status informa-
     tion need not be synchronized, which may result in a performance gain, compared to fsync(2).
     This behaviour is commonly known as synchronized I/O data integrity completion.

RETURN VALUES
     A value of 0 is returned on success.  Otherwise, a value -1 is returned and errno is set to
     indicate the error.

ERRORS
     The fdatasync() function will fail if:

     [EBADF]		The fd argument is not a valid file descriptor open for writing.

     [EINVAL]		This implementation does not support synchronized I/O for this file.

     [ENOSYS]		The fdatasync() function is not supported by this implementation.

     In the event that any of the I/O operations to be performed fail, fdatasync() returns the
     error conditions defined for read(2) and write(2), and outstanding I/O operations are not
     guaranteed to have been completed.

SEE ALSO
     fsync(2), open(2), read(2), write(2)

STANDARDS
     The fdatasync() function conforms to IEEE Std 1003.1b-1993 (``POSIX.1'').

BSD					 October 25, 2003				      BSD
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