PATCH: openfiles support for Linux

[Petya]

Patch against trunk but could be easily adopted for older versions.

Together with support for openfiles under Linux
it contains fix for obvious typo:

Index: C:/myprj/zabbix.com/trunk/src/libs/zbxsysinfo/linux/kernel.c
================================================== =================
--- C:/myprj/zabbix.com/trunk/src/libs/zbxsysinfo/linux/kernel.c (revision 5756)
+++ C:/myprj/zabbix.com/trunk/src/libs/zbxsysinfo/linux/kernel.c (working copy)
@@ -36,7 +36,7 @@

if(NULL != ( f = fopen("/proc/sys/fs/file-max","r") ))
{
- if(fgets(line,MAX_STRING_LEN,f) != NULL);
+ if(fgets(line,MAX_STRING_LEN,f) != NULL)
{
if(sscanf(line,ZBX_FS_UI64 "\n", &value) == 1)
{

[otheus]

This seems to work in Zabbix 1.6.3 for Kernels 2.6.9 and greater. What does not work is "kernel.maxproc". The definition of that can be found in the same source file, around line 68:

        mib[0]=CTL_KERN;
        mib[1]=KERN_MAXPROC;

        len=sizeof(maxproc);

        if(sysctl(mib,2,&maxproc,(size_t *)&len,NULL,0) != 0)

In my linux/sysctl.h, that parameter (KERN_MAXPROC) does not appear. These do, however:

        KERN_PIDMAX=55,         /* int: PID # limit */
        KERN_MAX_THREADS=39,    /* int: Maximum nr of threads in the system */

I imagine the "interesting" number is the lesser of these two.

Autoconfigure seems to my think it has "KERN_MAXPROC" even when it does not.