SYNC (2) | System calls | Unix Manual Pages



SYNC (2) \| System calls \| Unix Manual Pages \| :man▋ NAME sync - "schedule file system updates" CONTENTS Library Synopsis Description See Also History Bugs LIBRARY .Lb libc SYNOPSIS .In unistd.h void `sync void` DESCRIPTION The `sync` system call forces a write of dirty (modified) buffers in the block buffer cache out to disk. The kernel keeps this information in core to reduce the number of disk I/O transfers required by the system. As information in the cache is lost after a system crash, a `sync` system call is issued frequently by the user process syncer(4) (about every 30 seconds). The fsync(2) system call may be used to synchronize individual file descriptor attributes. SEE ALSO fsync(2), syncer(4), sync(8) HISTORY BUGS

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