sg_get_network_iface_stats(3)sg_get_network_iface_stats(3)NAME
sg_get_network_iface_stats, sg_get_network_iface_stats_r, sg_free_net‐
work_iface_stats, sg_network_iface_compare_name - get network interface
statistics
SYNOPSIS
#include <statgrab.h>
sg_network_iface_stats *sg_get_network_iface_stats (size_t *entries);
sg_network_iface_stats *sg_get_network_iface_stats_r (size_t *entries);
sg_error sg_free_network_iface_stats (sg_network_iface_stats *data);
int sg_network_iface_compare_name (const void *va, const void *vb);
DESCRIPTION
The functions sg_get_network_iface_stats() and sg_get_net‐
work_iface_stats_r() return statistics about the network interfaces in
the machine. Specifically, they return the speed of the interface, the
duplex state, and whether it is currently up. Both functions take an
optional entries parameter, which points (when given) to a size_t to
take the number of returned vector entries.
API Shortcut
┌───────────────────┬────────────────────┬─────────────────────┐
│function │ returns │ data owner │
├───────────────────┼────────────────────┼─────────────────────┤
│sg_get_net‐ │ sg_net‐ │ libstatgrab (thread │
│work_iface_stats │ work_iface_stats * │ local) │
├───────────────────┼────────────────────┼─────────────────────┤
│sg_get_net‐ │ sg_net‐ │ caller │
│work_iface_stats_r │ work_iface_stats * │ │
└───────────────────┴────────────────────┴─────────────────────┘
The sg_network_iface_stats vectors received from sg_get_net‐
work_iface_stats_r() must be freed using sg_free_network_iface_stats()
when not needed any more. The caller is responsible for doing it.
Additionally a support function for qsort(3) in available: sg_net‐
work_iface_compare_name().
Sort Example
size_t entries;
sg_network_iface_stats *network_iface_stats = NULL;
while( NULL != ( network_iface_stats = sg_get_network_iface_stats(&entries) ) ) {
/* order entries alphabetically using the mountpoint */
qsort( network_iface_stats, entries, sizeof(network_iface_stats[0]), &sg_network_iface_compare_name );
show_network_iface_stats( network_iface_stats );
}
RETURN VALUES
The sg_get_network_iface_stats returns a pointer to a structure of type
sg_network_iface_stats.
typedef enum{
SG_IFACE_DUPLEX_FULL,
SG_IFACE_DUPLEX_HALF,
SG_IFACE_DUPLEX_UNKNOWN
}sg_iface_duplex;
Note: The SG_IFACE_DUPLEX_UNKNOWN value could mean that duplex hasn't
been negotiated yet.
typedef struct {
char *interface_name;
int speed;
sg_iface_duplex duplex;
int up;
time_t systime;
} sg_network_iface_stats;
interface_name
The name known to the operating system. (eg. on linux it might
be eth0)
speed The speed of the interface, in megabits/sec.
duplex The duplex state the interface is in. See sg_iface_duplex for
permitted values.
up Whether the interface is up.
systime
The timestamp when the above stats where collected in seconds
since epoch
BUGS
Getting specific details may require elevated privileges, eg. on Linux
the interface speed isn't visible to non-privileged processes.
The compare functions exist rather for backward compatibility than for
functionality enhancements. Limited flexibility (e.g. reverse order)
and lack of optimising opportunities for the compiler leads to the rec‐
ommendation to implement the required compare routines locally.
SEE ALSOstatgrab(3)WEBSITE
⟨http://www.i-scream.org/libstatgrab/⟩
i-scream 2013-06-07 sg_get_network_iface_stats(3)
