check_uptime with full support for notifications

Usage: check_uptime [--warning [@]start:end] [--critical [@]start:end] Examples: check_uptime check_uptime --warning 30: --critical 15: Supported platforms: * Linux (tested on openmamba GNU/Linux and RHEL 4,5,6) * FreeBSD 8.2-RELEASE-p10 * AIX 6.1 with gcc 4.2.0 * Solaris 11.1 (SunOS solaris 5.11 11.1) with gcc 4.5.2 * OpenIndiana build 151a7 with gcc 4.3.3 * OpenBSD 5.2 with gcc 4,2,1 Please drop me a note if this plugin does not compile or run on your favorite os! Note. The corresponding plugin shipped by nagios-plugins 2.0 or better is based on the clock monotonic function (clock_gettime() with clockid_t eq. to CLOCK_MONOTONIC). According to the POSIX specifications "the value returned by clock_gettime() represents the amount of time (in seconds and nanoseconds) since an unspecified point in the past (for example, system start-time, or the Epoch)". The (recent) Linux kernels returns a value that is somehow related to the system start-time but can be different from the output of the command uptime (procps), or the first value returned by /proc/uptime. $ /usr/bin/uptime 18:45:00 up 8:46, 7 users, load average: 0.67, 1.79, 2.49 $ awk '{printf("%02d:%02dn",($1/60/60%24),($1/60%60))}' /proc/uptime 08:46 $ ./clock_monotonic 4 hours 37 min Conversely, the implementation followed by this Nagios plugins is compatible with uptime and /proc/uptime

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