fdatasync(2) [netbsd man page]

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 information 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

fdatasync(3C)						   Standard C Library Functions 					     fdatasync(3C)

NAME

       fdatasync - synchronize a file's data

SYNOPSIS

       #include <unistd.h>

       int fdatasync(int fildes);

DESCRIPTION

       The  fdatasync()  function  forces  all currently queued I/O operations associated with the file indicated by file descriptor fildes to the
       synchronized I/O completion state.

       The functionality is as described for fsync(3C) (with the symbol _XOPEN_REALTIME defined), with the exception that all I/O  operations  are
       completed as defined for synchronised I/O data integrity completion.

RETURN VALUES

       If  successful,	the fdatasync() function returns 0. Otherwise, the function returns -1 and sets errno to indicate the error. If the fdata-
       sync() function fails, outstanding I/O operations are not guaranteed to have been completed.

ERRORS

       The  fdatasync() function will fail if:

       EBADF	 The fildes argument is not a valid file descriptor open for writing.

       EINVAL	 The system does not support synchronized I/O for this file.

       ENOSYS	 The function fdatasync() is not supported by the system.

       In the event that any of the queued I/O operations fail, fdatasync() returns the error conditions defined for read(2) and write(2).

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Async-Signal-Safe 	   |
       +-----------------------------+-----------------------------+
       |Standard		     |See standards(5). 	   |
       +-----------------------------+-----------------------------+

SEE ALSO

       fcntl(2), open(2), read(2), write(2), fsync(3C), aio_fsync(3C), fcntl.h(3HEAD), attributes(5), standards(5)

SunOS 5.11							    5 Feb 2008							     fdatasync(3C)