fdatasync()

Synchronize file data

Synopsis:

#include <unistd.h>

int fdatasync( int filedes );

Arguments:

filedes

The descriptor of the file that you want to synchronize.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The fdatasync() function forces all queued I/O operations for the file specified by the filedes file descriptor to finish, synchronizing the file's data. The function blocks until this is finished. For more information about synchronizing, see “Filesystems and block I/O (devb-*) drivers” in the Fine-Tuning Your System chapter of the QNX Neutrino User's Guide.

This function is similar to fsync(), except that fsync() also guarantees the integrity of file information, such as access and modification times.

Returns:

0

Success.

-1

An error occurred (errno is set).

Errors:

EBADF

The specified filedes isn't a valid file descriptor open for writing.

EINVAL

The implementation doesn't support synchronized I/O for the given file.

ENOSYS

The fdatasync() function isn't supported for the filesystem specified by filedes.

Classification:

POSIX 1003.1 SIO

See also:

aio_fsync(), close(), fcntl(), fsync(), open(), read(), sync(), write()

“Filesystems and block I/O (devb-*) drivers” in the Fine-Tuning Your System chapter of the QNX Neutrino User's Guide