sync(2POSIX)

NAME | SYNOPSIS | API RESTRICTIONS | FEATURES | DESCRIPTION | ATTRIBUTES | SEE ALSO | BUGS

NAME

sync- synchronize the disk block in-core status with that on disk

SYNOPSIS

#include <unistd.h>

void sync(void);

API RESTRICTIONS

The function or functions documented here may not be used safely in all application contexts with all APIs provided in the ChorusOS 5.0 product.

See API(5FEA) for details.

FEATURES

MSDOSFS, NFS_CLIENT, UFS

DESCRIPTION

The sync function forces a write of dirty (modified) buffers in the block buffer cache to disk. The microkernel keeps this information in core to reduce the number of disk I/O transfers required by the system.

A daemon can be created for the sync function, as shown in the following example:

while (1) {
	sync();
	threadDelay(&time);
}

The fsync(2) function may be used to synchronize individual file descriptor attributes.

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE	ATTRIBUTE VALUE
Interface Stability	Evolving

SEE ALSO

fsync(2POSIX)

BUGS

The sync call may return before the buffers are completely flushed.

ChorusOS 5.0  Last Revised December 2001

NAME | SYNOPSIS | API RESTRICTIONS | FEATURES | DESCRIPTION | ATTRIBUTES | SEE ALSO | BUGS