sync.2 (2010 09)

sync(2) sync(2)

NAME

sync, lsync - update disk

SYNOPSIS

#include <unistd.h>

void sync(void);

void lsync(void);

DESCRIPTION

sync() causes all information in memory that should be on disk to be written out. This includes

modiﬁed ﬁle system meta-data and delayed block I/O.

It should be used by commands and programs that examine a ﬁle system, such as

fsck, df, and so on. It

is mandatory before a shutdown.

The writing, although scheduled, is not necessarily complete upon return from

sync().

In some HP-UX systems,

sync() may be reduced to a no-op. This is permissible on a system which

does not cache buffers or in a system that in some way ensures that the disks are always in a consistent

state.

lsync() is a deprecated system call that is currently functionally identical to sync(). HP-UX kernel

support for it remains only to aid compatibility with very old HP-UX binaries.

AUTHOR

sync() was developed by HP and AT&T Bell Laboratories.

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sync(2) sync(2) NAME sync, lsync - update disk SYNOPSIS #include void sync(void); void lsync(void); DESCRIPTION sync() causes all information in memory that should be on disk to be written out. This includes modified file system meta-data and delayed block I/O. It should be used by commands and programs that examine a file system, such as fsck, df, and so on. It is mandatory before a shutdown. The writing, although scheduled, is not necessarily complete upon return from sync().
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(Notes) A (Notes) sA 2 Hewlett-Packard Company −1− HP-UX 11i Version 3: September 2010