sync, fsync - update dirty buffers and super-block
#include <unistd.h> int sync(void) int fsync(fd)
Sync causes all information in the file system buffers that should be on disk to be written out. This includes modified super blocks, modified i-nodes, and delayed block I/O. Fsync does the same thing, but only for the blocks associ- ated with a specific file descriptor. Under minix, currently the two calls do the same thing.
reboot(2), sync(8).