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
fdatasync() 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(7) for descriptions of the following attributes:


+--------------------+-------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-------------------+
|Interface Stability | Committed |
+--------------------+-------------------+
|MT-Level | Async-Signal-Safe |
+--------------------+-------------------+
|Standard | See standards(7). |
+--------------------+-------------------+

SEE ALSO

fcntl(2), open(2), read(2), write(2), aio_fsync(3C), fsync(3C),
fcntl.h(3HEAD), attributes(7), standards(7)

February 5, 2008 FDATASYNC(3C)