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FDATASYNC
Section: POSIX Programmer's Manual (3P)
Updated: 2003
Index
Return to Main Contents
PROLOG
This manual page is part of the POSIX Programmer's Manual.
The Linux implementation of this interface may differ (consult
the corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
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 indicate 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 Technology
-- 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 .
Index
- PROLOG
-
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- EXAMPLES
-
- APPLICATION USAGE
-
- RATIONALE
-
- FUTURE DIRECTIONS
-
- SEE ALSO
-
- COPYRIGHT
-
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