_close

Article
08/03/2021
2 minutes to read

Closes a file.

Syntax

int _close(
   int fd
);

Parameters

fd
File descriptor referring to the open file.

Return Value

_close returns 0 if the file was successfully closed. A return value of -1 indicates an error.

Remarks

The _close function closes the file associated with fd.

The file descriptor and the underlying OS file handle are closed. Thus, it is not necessary to call CloseHandle if the file was originally opened using the Win32 function CreateFile and converted to a file descriptor using _open_osfhandle.

This function validates its parameters. If fd is a bad file descriptor, the invalid parameter handler is invoked, as described in Parameter Validation. If execution is allowed to continue, the functions returns -1 and errno is set to EBADF.

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

Requirements

Routine	Required header	Optional header
_close	<io.h>	<errno.h>

For more compatibility information, see Compatibility.

Example

See the example for _open.