fsync(2)
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 which 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.
[EINVAL] The implementation does not support synchronized I/O for this file.
SEE ALSO
BUGS
The current implementation of this call is expensive for large files.
CX/UX Programmer’s Reference Manual