* addr2line.c (main_exe_path): support FreeBSD.

  At least sh, csh, tcsh, bash, and zsh sets realpath of the main
  executable for dladdr, but gdb doesn't.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45586 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 23 insertions, 0 deletions

diff --git a/addr2line.c b/addr2line.c
index 81e504105f..38c3d8fd3c 100644
--- a/addr2line.c
+++ b/addr2line.c
@@ -623,6 +623,15 @@ fill_lines(int num_traces, void **traces, int check_debuglink,
 }
 
 #define HAVE_MAIN_EXE_PATH
+#if defined(__FreeBSD__)
+# include <sys/sysctl.h>
+#endif
+/* ssize_t main_exe_path(void)
+ *
+ * store the path of the main executable to `binary_filename`,
+ * and returns strlen(binary_filename).
+ * it is NUL terminated.
+ */
 #if defined(__linux__)
 ssize_t
 main_exe_path(void)
@@ -632,6 +641,20 @@ main_exe_path(void)
     binary_filename[len] = 0;
     return len;
 }
+#elif defined(__FreeBSD__)
+ssize_t
+main_exe_path(void)
+{
+    int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1};
+    size_t len = PATH_MAX;
+    int err = sysctl(mib, 4, binary_filename, &len, NULL, 0);
+    if (err) {
+	kprintf("Can't get the path of ruby");
+	return -1;
+    }
+    len--; /* sysctl sets strlen+1 */
+    return len;
+}
 #else
 #undef HAVE_MAIN_EXE_PATH
 #endif