Experimental Physics and
Industrial Control System

-----Original Message-----
From:	Guy Jennings [SMTP:[email protected]]
Sent:	Monday, November 02, 1998 3:18 PM
To:	Jeff Hill
Subject:	Re: CA Server doesn't work on Linux/Intel ??

Jeff,

Good news!!!   Following your analysis of the problem with the ca server
on Intel Linux I have been able to isolate the problem to a small
section of code.   It appears to be a bug in the Linux kernel, and by
upgrading to the latest 'experimental' kernel the problem is fixed.

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

int main (int argc, char** argv)
{
  struct sockaddr_in saddr;
  int yes = 1;
  int ssize;

  int s = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);

  memset((void *)&saddr, 0, sizeof(saddr));

  saddr.sin_family = AF_INET;
  saddr.sin_port = 5064;
  saddr.sin_addr.s_addr = 0;
  bind (s, (struct sockaddr*) &saddr, sizeof(saddr));
  printf ("%-0.8x\n", saddr.sin_addr.s_addr);

  ssize = sizeof(saddr);
  getsockname(s, (struct sockaddr*) &saddr, &ssize);

  printf ("%-0.8x\n", saddr.sin_addr.s_addr);
}

On the Intel linux (kernel 2.0.34) the above program prints out:
00000000
0100007f

but on PPC & 68K (kernel >= 2.1.106) I get
00000000
00000000

After upgrading the linux kernel to 2.1.126 I get
00000000
00000000

I'm not sure exactly which call is at fault, maybe the 'bind'? but the
server seems to work fine now.

Many thanks for pointing me in the right direction,

Guy Jennings

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