From 68b9939aecfb9a890549e820488812ae566b6aa9 Mon Sep 17 00:00:00 2001
From: Mark Kettenis <kettenis@gnu.org>
Date: Sun, 1 May 2005 10:06:12 +0000
Subject: [PATCH] * fbsd-nat.c: Include <sys/sysctl.h>.
 (fbsd_pid_to_exec_file): Use KERN_PROC_PATHNAME sysctl if available.  Plug
 memory leak.  Fixes PR gdb/1922.

---
 gdb/ChangeLog  |  6 ++++++
 gdb/fbsd-nat.c | 29 +++++++++++++++++++++--------
 2 files changed, 27 insertions(+), 8 deletions(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 35479b0..c220857 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,9 @@
+2005-05-01  Mark Kettenis  <kettenis@gnu.org>
+
+	* fbsd-nat.c: Include <sys/sysctl.h>.
+	(fbsd_pid_to_exec_file): Use KERN_PROC_PATHNAME sysctl if
+	available.  Plug memory leak.  Fixes PR gdb/1922.
+
 2005-04-29  Mark Kettenis  <kettenis@gnu.org>
 
 	* solist.h (TARGET_SO_FREE_SO, TARGET_SO_CLEAR_SOLIB) 
diff --git a/gdb/fbsd-nat.c b/gdb/fbsd-nat.c
index 2b19f70..05d00b5 100644
--- a/gdb/fbsd-nat.c
+++ b/gdb/fbsd-nat.c
@@ -27,8 +27,9 @@
 
 #include "gdb_assert.h"
 #include "gdb_string.h"
-#include <sys/procfs.h>
 #include <sys/types.h>
+#include <sys/procfs.h>
+#include <sys/sysctl.h>
 
 #include "elf-bfd.h"
 #include "fbsd-nat.h"
@@ -39,18 +40,30 @@
 char *
 fbsd_pid_to_exec_file (int pid)
 {
+  size_t len = MAXPATHLEN;
+  char *buf = xcalloc (len, sizeof (char));
   char *path;
-  char *buf;
 
-  path = xstrprintf ("/proc/%d/file", pid);
-  buf = xcalloc (MAXPATHLEN, sizeof (char));
-  make_cleanup (xfree, path);
-  make_cleanup (xfree, buf);
+#ifdef KERN_PROC_PATHNAME
+  int mib[4];
 
-  if (readlink (path, buf, MAXPATHLEN) > 0)
+  mib[0] = CTL_KERN;
+  mib[1] = KERN_PROC;
+  mib[2] = KERN_PROC_PATHNAME;
+  mib[3] = pid;
+  if (sysctl (mib, 4, buf, &len, NULL, 0) == 0)
     return buf;
+#endif
+
+  path = xstrprintf ("/proc/%d/file", pid);
+  if (readlink (path, buf, MAXPATHLEN) == -1)
+    {
+      xfree (buf);
+      buf = NULL;
+    }
 
-  return NULL;
+  xfree (path);
+  return buf;
 }
 
 static int
-- 
2.7.4