sg_get_network_io_stats(3)				     Library Functions Manual					sg_get_network_io_stats(3)

NAME

       sg_get_network_io_stats, sg_get_network_io_stats_diff - get network statistics

SYNOPSIS

       #include <statgrab.h>

       sg_network_io_stats *sg_get_network_io_stats(int *entries);

       sg_network_io_stats *sg_get_network_io_stats_diff(int *entries);

DESCRIPTION

       Both calls take a pointer to an int, entries, which is filled with the number of network interfaces the machine has. This is needed to know
       how many sg_network_io_stats structures have been returned. A pointer is returned to the first sg_network_io_stats.

       sg_get_network_io_stats returns the network traffic stored in the kernel which holds the amount of data transferred since bootup.  On  some
       platforms, such as Solaris 7, this value is stored in a 32bit int, so wraps around when it reaches 4GB. Other platforms, such as Solaris 8,
       hold the value in a 64bit int, which wraps somewhere near 17 million terabytes.

       sg_get_network_io_stats also returns the number of packets sent and received, and the number of errors that have occured. It also makes the
       number of collisions available.

       sg_get_network_io_stats_diff  is  the  same  as	sg_get_network_io_stats  except it will return the difference since the last call. So, for
       instance a call to sg_get_network_io_stats_diff is made, and called again 5 seconds later. Over that time, 20 bytes of traffic  was  trans-
       mitted and 10 bytes received. Tx will store 20, rx will store 10 and systime will store 5. This function copes with wrap arounds by the O/S
       so should be seemless to use.

RETURN VALUES

       All network statistics return a pointer to a structure of type sg_network_io_stats.

       typedef struct{
	       char *interface_name;
	       long long tx;
	       long long rx;
	       long long ipackets;
	       long long opackets;
	       long long ierrors;
	       long long oerrors;
	       long long collisions;
	       time_t systime;
       }sg_network_io_stats;

       interface_name
	      The name known to the operating system.  (eg. on linux it might be eth0)

       tx     The number of bytes transmitted.

       rx     The number of bytes received.

       ipackets
	      The number of packets received.

       opackets
	      The number of packets transmitted.

       ierrors
	      The number of receive errors.

       oerrors
	      The number of transmit errors.

       collisions
	      The number of collisions.

       systime
	      The time period over which tx and rx were transferred.

BUGS

       On the very first call sg_get_network_io_stats_diff will return the same as sg_get_network_io_stats. After the first call  it  will  always
       return the difference.

       On  operating  system that hold only 32bits of data there is a problem if the values wrap twice. For example, on Solaris 7 if 9GB is trans-
       ferred and the operating system wraps at 4GB, the sg_get_network_io_stats_diff function will return 5GB.

SEE ALSO

       statgrab(3)

WEBSITE

       http://www.i-scream.org/libstatgrab/

i-scream						   $Date: 2005/04/25 11:25:45 $ 				sg_get_network_io_stats(3)