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sums, not eating 100% cpu :)

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This commit is contained in:
Arnout Engelen
2006-12-19 20:35:33 +00:00
parent 06bd2d4a25
commit c0e6a385e4
10 changed files with 140 additions and 25 deletions
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32
nethogs.cpp
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@@ -345,7 +345,8 @@ int main (int argc, char** argv)
if (newhandle != NULL)
{
/* The following code solves sf.net bug 1019381, but is only available
* in newer versions (from 0.8 it seems) of libpcap */
* in newer versions (from 0.8 it seems) of libpcap
*/
if (dp_setnonblock (newhandle, 1, errbuf) == -1)
{
// ERROR
@@ -359,29 +360,54 @@ int main (int argc, char** argv)
signal (SIGALRM, &alarm_cb);
signal (SIGINT, &quit_cb);
alarm (refreshdelay);
fprintf(stderr, "Waiting for first packet to arrive (see sourceforge.net bug 1019381)\n");
// Main loop:
//
// Walks though the 'handles' list, which contains handles opened in non-blocking mode.
// This causes the CPU utilisation to go up to 100%. This is tricky:
while (1)
{
bool packets_read = false;
handle * current_handle = handles;
while (current_handle != NULL)
{
struct dpargs * userdata = (dpargs *) malloc (sizeof (struct dpargs));
userdata->sa_family = AF_UNSPEC;
currentdevice = current_handle->devicename;
dp_dispatch (current_handle->content, -1, (u_char *)userdata, sizeof (struct dpargs));
int retval = dp_dispatch (current_handle->content, -1, (u_char *)userdata, sizeof (struct dpargs));
if (retval == -1 || retval == -2)
{
std::cerr << "Error dispatching" << std::endl;
}
else if (retval != 0)
{
packets_read = true;
}
free (userdata);
current_handle = current_handle->next;
}
if ((!DEBUG)&&(!tracemode)) {
if ((!DEBUG)&&(!tracemode))
{
// handle user input
ui_tick();
}
if (needrefresh)
{
do_refresh();
needrefresh = false;
}
// If no packets were read at all this iteration, pause to prevent 100%
// CPU utilisation;
if (!packets_read)
{
usleep(100);
}
}
}