fsync()

Synchronize the file state

Synopsis:

#include <unistd.h>

int fsync( int filedes );

Library:

libc

Description:

The fsync() function forces all queued I/O operations for the file specified by the filedes file descriptor to finish, synchronizing the file's state.

Although similar to fdatasync(), fsync() also guarantees the integrity of file information such as access and modification times.

Returns:

0 for success, or -1 if an error occurs (errno is set).

Errors:

EBADF

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

EINVAL

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

ENOSYS

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

Classification:

POSIX 1003.1

See also:

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