#include <config.h> #include <glib.h> #include <time.h> #include "netspeed.h" enum { N_STATES = 4 }; struct _NetSpeed { LoadGraph *graph; gulong states[N_STATES]; size_t cur; }; NetSpeed* netspeed_new(LoadGraph *g) { NetSpeed *ns = g_new0(NetSpeed, 1); ns->graph = g; return ns; } void netspeed_delete(NetSpeed *ns) { g_free(ns); } void netspeed_add(NetSpeed *ns, gulong tx) { ns->cur = (ns->cur + 1) % N_STATES; ns->states[ns->cur] = tx; } /* Something very similar to g_format_size_for_display() but for rates. * This should give the same display as in g-s-m */ static char* format_rate_for_display(guint rate) { char* bytes = g_format_size_for_display(rate); return g_strdup_printf(_("%s/s"), bytes); } char* netspeed_get(NetSpeed *ns) { gulong older, newer; guint rate; newer = ns->states[ns->cur]; older = ns->states[(ns->cur + 1) % N_STATES]; if ((older != 0) && (newer > older)) rate = (newer - older) * 1000 / ((N_STATES - 1) * ns->graph->speed); else /* We end up here if we haven't got enough data yet or the network interface has jumped back (or there has never been any activity on any interface). A value of 0 is likely to be accurate, but if it is wrong it will be clearly wrong. In any event, it should fix itself in a few seconds. */ rate = 0; return format_rate_for_display(rate); }