sync - update superblock

Syntax	#include <unistd.h> void sync(void);
Description	sync() causes all information in memory that updates file systems to be scheduled for writing out to all file systems. This includes modified superblocks, modified inodes and delayed block-special I/O files. sync() should be used by programs which check a file system, for example fsck() or df(). sync() is mandatory before a new system is loaded. When sync() returns, the writing is not necessarily finished. The system call fsync() finishes writing before it returns.
Return val.	The function does not return any values.
See also	fsync(), unistd.h.