SYNC(2) System Calls SYNC(2)

NAME

sync - update super block

SYNOPSIS

#include <unistd.h>

void
sync(void);

DESCRIPTION

The sync() function writes all information in memory that should be on
disk, including modified super blocks, modified inodes, and delayed
block I/O.

Unlike fsync(3C), which completes the writing before it returns, sync()
schedules but does not necessarily complete the writing before
returning. To perform a blocking synchronization of a single file
system, use the syncfs(3C) function.

USAGE

The sync() function should be used by applications that examine a file
system, such as fsck(8), df(8), and is mandatory before rebooting.

INTERFACE STABILITY

Committed

SEE ALSO

fsync(3C), syncfs(3C), attributes(7), standards(7), df(8), fsck(8)

illumos July 2, 2024 illumos