Rewrite nbsd_nat_target::pid_to_exec_file to sysctl(3)

[deliverable/binutils-gdb.git] / gdb / nbsd-nat.c

diff --git a/gdb/nbsd-nat.c b/gdb/nbsd-nat.c
index 274ef435b85e544490c227746279d58c22d43850..326bbe3aec30807f298f80599bb6f0754b328259 100644 (file)
--- a/gdb/nbsd-nat.c
+++ b/gdb/nbsd-nat.c
@@ -1,6 +1,6 @@
 /* Native-dependent code for NetBSD.
 
-   Copyright (C) 2006-2013 Free Software Foundation, Inc.
+   Copyright (C) 2006-2020 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -19,27 +19,23 @@
 
 #include "defs.h"
 
-#include <sys/param.h>
-
 #include "nbsd-nat.h"
 
+#include <sys/types.h>
+#include <sys/ptrace.h>
+#include <sys/sysctl.h>
+
 /* Return the name of a file that can be opened to get the symbols for
    the child process identified by PID.  */
 
 char *
-nbsd_pid_to_exec_file (int pid)
+nbsd_nat_target::pid_to_exec_file (int pid)
 {
-  size_t len = MAXPATHLEN;
-  char *buf = xcalloc (len, sizeof (char));
-  char *path;
-
-  path = xstrprintf ("/proc/%d/exe", pid);
-  if (readlink (path, buf, MAXPATHLEN - 1) == -1)
-    {
-      xfree (buf);
-      buf = NULL;
-    }
-
-  xfree (path);
+  static char buf[PATH_MAX];
+  size_t buflen;
+  int mib[4] = {CTL_KERN, KERN_PROC_ARGS, pid, KERN_PROC_PATHNAME};
+  buflen = sizeof (buf);
+  if (sysctl (mib, ARRAY_SIZE (mib), buf, &buflen, NULL, 0))
+    return NULL;
   return buf;
 }