[Mono-dev] use sysctl for get_boot_time() on *BSD systems and Mac OS X

[Robert Nagy]

Tested on OpenBSD and FreeBSD.

Index: mono/utils/mono-time.c
===================================================================
--- mono/utils/mono-time.c      (revision 155053)
+++ mono/utils/mono-time.c      (working copy)
@@ -57,12 +57,32 @@
 #include <sys/time.h>
 #endif
 
+#if defined(__APPLE__) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)
+#include <sys/param.h>
+#include <sys/sysctl.h>
+#endif
+
 #include <time.h>
 
 static gint64
 get_boot_time (void)
 {
-       /* FIXME: use sysctl (kern.boottime) on OSX */
+#if defined(PLATFORM_MACOSX) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)
+       int mib [2];
+       size_t size;
+       time_t now;
+       struct timeval boottime;
+
+       (void)time(&now);
+
+       mib [0] = CTL_KERN;
+       mib [1] = KERN_BOOTTIME;
+
+       size = sizeof(boottime);
+
+       if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1)
+               return (gint64)((now - boottime.tv_sec) * MTICKS_PER_SEC);
+#else
        FILE *uptime = fopen ("/proc/uptime", "r");
        if (uptime) {
                double upt;
@@ -73,6 +93,7 @@
                }
                fclose (uptime);
        }
+#endif
        /* a made up uptime of 300 seconds */
        return (gint64)300 * MTICKS_PER_SEC;
 }