NAME

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

SYNOPSIS

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 that require a file to be in a known state, for example, in building a simple transaction facility. 

RETURN VALUE

A 0 value is returned on success.  A −1 value indicates an error. 

ERRORS

The fsync fails if:

[EBADF] Fd is not a valid descriptor. 

[EIO] An I/O error occurred while reading from or writing to the file system. 

SEE ALSO

sync(2), sync(1M)

September 29, 2021