From: Damjan Jovanovic <damjan.jov@gmail.com>
Subject: [PATCH 3/8] ntdll: use sysctl instead of /proc/curproc/file on FreeBSD
Message-Id: <CAJm2B-mfN1Ywn2Eb0c7u2g2npv0O9LULhYLke_03e1xYd8cNcg@mail.gmail.com>
Date: Sat, 23 Oct 2021 10:15:55 +0200

Signed-off-by: Damjan Jovanovic <damjan.jov@gmail.com>
---
 dlls/ntdll/unix/loader.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/dlls/ntdll/unix/loader.c b/dlls/ntdll/unix/loader.c
index 4e807744862..2be11dc3747 100644
--- a/dlls/ntdll/unix/loader.c
+++ b/dlls/ntdll/unix/loader.c
@@ -58,6 +58,10 @@
 #ifdef HAVE_SYS_WAIT_H
 #include <sys/wait.h>
 #endif
+#include <limits.h>
+#ifdef HAVE_SYS_SYSCTL_H
+# include <sys/sysctl.h>
+#endif
 #ifdef __APPLE__
 # include <CoreFoundation/CoreFoundation.h>
 # define LoadResource MacLoadResource
@@ -588,6 +592,11 @@ static void set_config_dir(void)
 static void init_paths( char *argv[] )
 {
     Dl_info info;
+#if defined (__FreeBSD__) || defined(__DragonFly__)
+    static int pathname[] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1 };
+    char *path;
+    size_t path_size;
+#endif
 
     argv0 = strdup( argv[0] );
 
@@ -600,7 +609,10 @@ static void init_paths( char *argv[] )
 #if (defined(__linux__) && !defined(__ANDROID__)) || defined(__FreeBSD_kernel__) || defined(__NetBSD__)
         bin_dir = realpath_dirname( "/proc/self/exe" );
 #elif defined (__FreeBSD__) || defined(__DragonFly__)
-        bin_dir = realpath_dirname( "/proc/curproc/file" );
+        path = malloc( path_size = PATH_MAX );
+        if (path && !sysctl( pathname, sizeof(pathname)/sizeof(pathname[0]), path, &path_size, NULL, 0 ))
+            bin_dir = realpath_dirname( path );
+        free( path );
 #else
         bin_dir = realpath_dirname( argv0 );
 #endif