HOST_NAME_MAX undefined on some systems

Anonymous — Thu, 14 Aug 2008 16:02:04 -0000

Hey there,

I’m packaging DNX for Fedora based on John Calcote’s OpenSUSE specfile, and I ran across the following issue:

DNX relies on the HOST_NAME_MAX macro in common/dnxTcp.h and common/dnxUdp.h. This constant is not guaranteed to work on POSIX systems, and leads to build problems in several versions of Fedora and elsewhere. Instead, sysconf(_SC_HOST_NAME_MAX) should be used at runtime to retrieve the value from the running kernel. I've also added support for MAXHOSTNAMELEN on older Solaris, and fall back to a sensible default (255) on other platforms.

This is defined as a new int, max_hostname, in common/dnxProtocol.c. Changes were made to common/dnxTcp.c and common/dnxUdp.c to make them only error out if the length is greater than 0, as -1 indicates the system does not have a maximum hostname size.

See attached patch.

patch for nagios-2.10

Graham — Thu, 22 Nov 2007 17:30:17 -0000

I've not tested this much yet so far but I've modified the existing patch to apply against 2.10

Recent changes to patches

HOST_NAME_MAX undefined on some systems

patch for nagios-2.10