Mesa (main): util: make util_get_process_exec_path work on FreeBSD w/o procfs

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Module: Mesa
Branch: main
Commit: 98dbd01a96fd1d715794c0fe8ad82392882a8129
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=98dbd01a96fd1d715794c0fe8ad82392882a8129

Author: Greg V <greg at unrelenting.technology>
Date:   Thu Apr  9 01:41:00 2020 +0300

util: make util_get_process_exec_path work on FreeBSD w/o procfs

sysctl is the correct way of getting the current executable's path.
procfs is not mounted by default.

Reviewed-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
Reviewed-by: Eric Engestrom <eric at engestrom.ch>
Cc: mesa-stable
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/1598>

---

 src/util/u_process.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/util/u_process.c b/src/util/u_process.c
index af808c7b196..2965e46a436 100644
--- a/src/util/u_process.c
+++ b/src/util/u_process.c
@@ -44,6 +44,11 @@
 #include <mach-o/dyld.h>
 #endif
 
+#if DETECT_OS_FREEBSD
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#endif
+
 #if defined(__linux__) && defined(HAVE_PROGRAM_INVOCATION_NAME)
 
 static char *path = NULL;
@@ -202,6 +207,13 @@ util_get_process_exec_path(char* process_path, size_t len)
    int result = _NSGetExecutablePath(process_path, &bufSize);
 
    return (result == 0) ? strlen(process_path) : 0;
+#elif DETECT_OS_FREEBSD
+   int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1 };
+
+   (void) sysctl(mib, 4, process_path, &len, NULL, 0);
+   process_path[len - 1] = '\0';
+
+   return len;
 #elif DETECT_OS_UNIX
    ssize_t r;