how to recover when getprotobyname("tcp") fails?

BrianK · 10-24-2002, 06:10 PM

When getprotobyname("tcp") returns NULL, how do you recover? I tried:

Code:

  while ( ((int)(ptrp = getprotobyname("tcp"))) == 0)  {
    fprintf(stderr, "cannot map \"tcp\" to protocol number\n");
    sleep(1);
  }

but it doesn't seem to get working again until the application trying to connect to this app disconnects.

Is there a good way to recover from this?

Mik · 10-25-2002, 06:54 AM

Never used getprotobyname. But I see several things in the man pages about setprotoent and endprotoent. It mentions things about keeping the file open in between calls. If getprotobyname doesn't rewind everytime then the second call would fail unless you called either setprotoent or endprotoent.
I'll leave it to you to figure out what happens when you run these functions.

BrianK · 10-25-2002, 01:37 PM

checking that out... thanks!