NAME

fsync − synchronize a file’s in-core state with that on disk

USAGE

fsync(fd)
int fd;

DESCRIPTION

Fsync causes all modified data and attributes of fd to be moved to a permanent storage device.  This normally results in all in-core modified copies of buffers for the associated file to be written to a disk. 

Fsync should be used by programs which require a file to be in a known state; for example in building a simple transaction facility. 

RETURN VALUE

A zero value is returned on success.  A −1 value indicates an error. 

ERRORS

The fsync fails if:

[EBADF] Fd is not a valid descriptor. 

[EINVAL] Fd refers to a socket, not to a file.