performance - How to calculate time of udp packet sending and receiving -


i have implemented udp packet sender , receiver. want calculate time transaction, sender receiver how time taking..

sender code:

void senderfunc() { /*some other code */ if((s1 = socket(af_inet, sock_dgram, ipproto_udp)) == -1)     error_handler("\nerror: in socket\n");     memset((char *) &me, 0, sizeof(me));     me.sin_family = af_inet;     me.sin_port = port;     if (inet_aton(g_ip, &me.sin_addr)==0)     {         fprintf(stderr, "inet_aton() failed\n");         exit(1);     }     printf("\tick - %d : %s",cntr++,str);     sprintf(b1, "%s",str);  // information in b1 buffer transfer      if(sendto(s1, b1, sizeof(b1),0,(struct sockaddr *) &me,n)==-1)     error_handler("\nerror: in sendto()\n");     close (s1);     return;     } }

receiver code:

int receiverfunc () {     struct sockaddr_in other, me;     int s2, n, = 1;     char b2[buflen];//, b2[buflen];     s2 = socket(af_inet, sock_dgram,0);     me.sin_family = af_inet;     me.sin_port = port;     me.sin_addr.s_addr = htonl(inaddr_any);     bind(s2,(struct sockaddr *)&me, sizeof(me));     n=sizeof(other);     int incr = 0;     while (i){         recvfrom (s2,b2,buflen,0,(struct sockaddr *) &other, &n);         printf ("\nsubnet 2: tick - %d : %s",incr++, b2);     }     return 0; }

can please me how can calculate time between transaction suppose sending packet sender receiver. how can calculate time?

thanks best responses forum.. looking best response..

thanks

rahee.

i think need:

1) synchronize client,server same timeserver (ntp), sure have same time.

on client side:

2) current time , send udp package timestart

#include <sys/time.h>  struct timeval timestart; gettimeofday(&timestart, null);  ... //put timestart  buffer ...

on server side:

3) extract time structure, , compare current time:

#include <sys/time.h>  ... //get timestart buffer ...  struct timeval timeend; gettimeofday(&timeend, null);  long diff_msec = (timestart.tv_sec  - timeend.tv_sec) / 1000 + (timestart.tv_usec  - timeend.tv_usec);

Comments

Post a Comment

Popular posts from this blog

java - Play! framework 2.0: How to display multiple image? -

i need display gallery of photos. here template: @(photos: list[photo]) @title = { <bold>gallery</bold> } @main(title,"photo"){ <ul class="thumbnails"> @for(photo <- photos) { <li class="span3"> <a href="#" class="thumbnail"> <img src="@photo.path" alt=""> </a> </li> } </ul> } and here controller method: public static result getphotos() { return ok(views.html.photo.gallery.render(photo.get())); } and here photo bean : @entity public class photo extends model { @id public long id; @required public string label; public string path; public photo(string path, string label) { this.path = path; this.label = label; } private static finder<long, photo> find = new finder<long, photo>( long.class, photo.class); public static list<phot...
Read more

gmail - Is there any documentation for read-only access to the Google Contacts API? -

i want read-only access user's google contacts. there stackoverflow member wanted this, , received following answer : yes, there is, use https://www.googleapis.com/auth/contacts.readonly scope , "view contacts". this exchange reference read-only access google contacts can find using google. simply using access token obtained attempt read usual google contacts api (i.e. https://www.google.com/m8/feeds ) fails insufficient permissions. similarly, using google contacts api on new target fails 404 errors (for example https://www.googleapis.com/auth/contacts.readonly/default/full ). is there documentation anywhere on how use api, or permissible way access google contacts api full read-write access?
Read more

php - Controller/JToolBar not working in Joomla 2.5 -

relevant code: jtoolbarhelper::custom('savecategories', 'save', '', 'save', false, false); ... <input type="hidden" name="controller" value="easyblogcontroller"> according can dig docs , own previous questions, should call savecategories() function in easyblogcontroller . i've tried setting value easyblog , easyblog.php (file name) current easyblogcontroller (class name). clicking on save button refreshes page. not redirect, echo or var_dump test code put in savecategories() function. var_dump ing jrequest::getvar('controller') , 'task' return correct values. creating controller object , using $controller->execute('task'); works. the values going depend on location of controller trying call, , have couple options here. typically there controller in base folder of component (likely components/com_easyblog) in file called controller.php , class name inside ...
Read more