Flushes a file directly to disk.


int _commit(
   int fd


File descriptor referring to the open file.

Return value

_commit returns 0 if the file was successfully flushed to disk. A return value of -1 indicates an error.


The _commit function forces the operating system to write the file associated with fd to disk. This call ensures that the specified file is flushed immediately, not at the operating system's discretion.

If fd is an invalid file descriptor, the invalid parameter handler is invoked, as described in Parameter validation. If execution is allowed to continue, the function returns -1 and errno is set to EBADF.

By default, this function's global state is scoped to the application. To change this behavior, see Global state in the CRT.


Routine Required header Optional headers
_commit <io.h> <errno.h>

For more compatibility information, see Compatibility.

See also

Low-level I/O
_creat, _wcreat
_open, _wopen