qnx_sync()

request that the file system manager flush inodes and blocks to disk

Synopsis:

#include <sys/types.h>
#include <unistd.h>
int qnx_sync( nid_t nid );

Description:

The qnx_sync() function requests that the filesystem manager running on the node indicated by nid start flushing all updated in-memory inodes and blocks in the buffer cache to disk.

The function will likely return before the operation is complete. There's no way to determine when the operation is complete.

Returns:

0

Success

-1

An error occurred. errno is set to indicate the error.

Errors:

ENOSYS

The sync() function isn't supported by the filesystem manager. Support for it exists in QNX4.1 Fsys or later.

ESRCH

No filesystem manager is running on the indicated node.

Examples:

/*
 * Tell Fsys on a specified node to start sync'ing
 */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>

void main( int argc, char *argv[] )
{
  nid_t nid = 0;
  int status = EXIT_SUCCESS;

  if( argc > 2 ) {
    fprintf( stderr, "use: %s [node]\n", argv[0] );
    exit( 0 );
  }
  else if( argc == 2 )
    nid = atol( argv[1] );

  if( qnx_sync( nid ) != 0 ) {
    status = EXIT_FAILURE;
    perror("sync");
  }

  exit( status );
}

Classification:

QNX

See also:

errno, fdatasync(), fsync(), sync(), umount()