[ping] Allow "ping" command output to be inhibited

Originally-implemented-by: Cedric Levasseur <cyr-ius@ipocus.net>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/core/pinger.c

 	int rc;
 
 	/* If no response has been received, notify the callback function */
-	if ( pinger->pending )
+	if ( pinger->pending && pinger->callback )
 		pinger->callback ( NULL, pinger->sequence, 0, -ETIMEDOUT );
 
 	/* Check for termination */
 	/* Discard I/O buffer */
 	free_iob ( iobuf );
 
-	/* Notify callback function */
-	pinger->callback ( meta->src, sequence, len, rc );
+	/* Notify callback function, if applicable */
+	if ( pinger->callback )
+		pinger->callback ( meta->src, sequence, len, rc );
 
 	/* Terminate if applicable */
 	if ( terminate )
  * @v timeout		Timeout (in ticks)
  * @v len		Payload length
  * @v count		Number of packets to send (or zero for no limit)
+ * @v callback		Callback function (or NULL)
  * @ret rc		Return status code
  */
 int create_pinger ( struct interface *job, const char *hostname,

src/hci/commands/ping_cmd.c

 	unsigned long timeout;
 	/** Number of packets to send (or zero for no limit) */
 	unsigned int count;
+	/** Inhibit output */
+	int quiet;
 };
 
 /** "ping" option list */
 		      struct ping_options, timeout, parse_timeout ),
 	OPTION_DESC ( "count", 'c', required_argument,
 		      struct ping_options, count, parse_integer ),
+	OPTION_DESC ( "quiet", 'q', no_argument,
+		      struct ping_options, quiet, parse_flag ),
 };
 
 /** "ping" command descriptor */
 
 	/* Ping */
 	if ( ( rc = ping ( hostname, opts.timeout, opts.size,
-			   opts.count ) ) != 0 )
+			   opts.count, opts.quiet ) ) != 0 )
 		return rc;
 
 	return 0;

src/include/usr/pingmgmt.h

 #include <stdint.h>
 
 extern int ping ( const char *hostname, unsigned long timeout, size_t len,
-		  unsigned int count );
+		  unsigned int count, int quiet );
 
 #endif /* _USR_PINGMGMT_H */

src/usr/pingmgmt.c

  * @v timeout		Timeout between pings, in ticks
  * @v len		Payload length
  * @v count		Number of packets to send (or zero for no limit)
+ * @v quiet		Inhibit output
  * @ret rc		Return status code
  */
 int ping ( const char *hostname, unsigned long timeout, size_t len,
-	   unsigned int count ) {
+	   unsigned int count, int quiet ) {
 	int rc;
 
 	/* Create pinger */
-	if ( ( rc = create_pinger ( &monojob, hostname, timeout, len,
-				    count, ping_callback ) ) != 0 ) {
+	if ( ( rc = create_pinger ( &monojob, hostname, timeout, len, count,
+				    ( quiet ? NULL : ping_callback ) ) ) != 0 ){
 		printf ( "Could not start ping: %s\n", strerror ( rc ) );
 		return rc;
 	}
 
 	/* Wait for ping to complete */
 	if ( ( rc = monojob_wait ( NULL, 0 ) ) != 0 ) {
-		printf ( "Finished: %s\n", strerror ( rc ) );
+		if ( ! quiet )
+			printf ( "Finished: %s\n", strerror ( rc ) );
 		return rc;
 	}