From patchwork Thu Mar 25 21:07:12 2010
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Subject: Use sysctl instead of /proc to find executable path on FreeBSD
From: Juergen Lock <nox@jelal.kn-bremen.de>
X-Patchwork-Id: 48598
Message-Id: <20100325210712.GA52370@triton8.kn-bremen.de>
To: qemu-devel@nongnu.org
Date: Thu, 25 Mar 2010 22:07:12 +0100

..since /proc usually isn't mounted on FreeBSD.

Signed-off-by: Juergen Lock <nox@jelal.kn-bremen.de>


--- a/vl.c
+++ b/vl.c
@@ -52,6 +52,7 @@
 #include <sys/stat.h>
 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
 #include <libutil.h>
+#include <sys/sysctl.h>
 #else
 #include <util.h>
 #endif
@@ -3368,10 +3369,13 @@ static char *find_datadir(const char *ar
     }
 #elif defined(__FreeBSD__)
     {
-        int len;
-        len = readlink("/proc/curproc/file", buf, sizeof(buf) - 1);
-        if (len > 0) {
-            buf[len] = 0;
+        static int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1};
+        size_t len = sizeof(buf) - 1;
+
+        *buf = '\0';
+        if (!sysctl(mib, sizeof(mib)/sizeof(*mib), buf, &len, NULL, 0) &&
+            *buf) {
+            buf[sizeof(buf) - 1] = '\0';
             p = buf;
         }
     }