[squid-users] Re: FD_SETSIZE and max open filedescriptors

In article <3C348BD4.8070008@zope.com>,
Chris McDonough <chrism@zope.com> wrote:
>I'm using Squid 2.4-STABLE3 on Linux 2.4.X, and it appears that the only
>way I can convince Squid to start with more than 1024 file descriptors
>(even if bash's ulimit -n reports, for example, 30000 at compilation
>time and runtime -- I'm dead certain that the OS and the shell limits
>are set high enough) is to bruce-force set the number in main.c like so:

Set ulimit -n to 4096 or so, apply this patch, then run configure:

Note that this is an UGLY HACK

Oh yes you need glibc 2.2 or later

--- squid-2.4.1.orig/src/squid.h Thu Feb 22 22:39:14 2001
+++ squid-2.4.1/src/squid.h Thu Jun 28 15:20:47 2001
@@ -45,10 +45,24 @@
  */
 #define CHANGE_FD_SETSIZE 1
 
-/* Cannot increase FD_SETSIZE on Linux */
+/*
+ * Cannot increase FD_SETSIZE on Linux, but we can increase __FD_SETSIZE
+ * with glibc 2.2 (or later? remains to be seen). We do this by including
+ * bits/types.h which defines __FD_SETSIZE first, then we redefine
+ * __FD_SETSIZE. Ofcourse a user program may NEVER include bits/whatever.h
+ * directly, so this is a dirty hack!
+ */
 #if defined(_SQUID_LINUX_)
-#undef CHANGE_FD_SETSIZE
-#define CHANGE_FD_SETSIZE 0
+# undef CHANGE_FD_SETSIZE
+# define CHANGE_FD_SETSIZE 0
+# include <features.h>
+# if (__GLIBC__ > 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 2)
+# if SQUID_MAXFD > DEFAULT_FD_SETSIZE
+# include <bits/types.h>
+# undef __FD_SETSIZE
+# define __FD_SETSIZE SQUID_MAXFD
+# endif
+# endif
 #endif
 
 /*

Mike.

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