fsync()

NAME

fsync() - synchronize disk and in-memory versions of a file

SYNOPSIS

#include <unistd.h>


int fsync (int fd)

DESCRIPTION

The fsync(2) call flushes the buffer for the specified file descriptor causes all modified data and attributes of fd to be moved to a permanent storage device. It flushes to disk the buffers for the specified file descriptor.

Use fsync(2) in programs that require a file to be in a known state, for example, in building a simple transaction facility.

RETURN VALUES

The fsync(2) call returns 0 for success. On an error, it returns -1 and sets errno to indicate the error.

ERRORS

The fsync(2) call fails for the following reasons:

[EBADF]

The file descriptor fd was invalid.

[EINTR]

The function was interrupted by a signal.

[EINVAL]

The file referred to by fd doesn't support the operation.

[EIO]

An I/O error occurred.