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-rw-r--r--backtrace.c26
1 files changed, 23 insertions, 3 deletions
diff --git a/backtrace.c b/backtrace.c
index 02ad1480372c..e5a6e5824ae6 100644
--- a/backtrace.c
+++ b/backtrace.c
@@ -1,4 +1,4 @@
-/* $NetBSD: backtrace.c,v 1.2 2012/07/09 03:11:59 christos Exp $ */
+/* $NetBSD: backtrace.c,v 1.3 2013/08/29 14:58:56 christos Exp $ */
/*-
* Copyright (c) 2012 The NetBSD Foundation, Inc.
@@ -29,7 +29,7 @@
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
-__RCSID("$NetBSD: backtrace.c,v 1.2 2012/07/09 03:11:59 christos Exp $");
+__RCSID("$NetBSD: backtrace.c,v 1.3 2013/08/29 14:58:56 christos Exp $");
#include <sys/param.h>
#include <assert.h>
@@ -50,9 +50,29 @@ __RCSID("$NetBSD: backtrace.c,v 1.2 2012/07/09 03:11:59 christos Exp $");
#ifdef __linux__
#define SELF "/proc/self/exe"
#else
+#include <sys/sysctl.h>
#define SELF "/proc/curproc/file"
#endif
+static int
+open_self(int flags)
+{
+ const char *pathname = SELF;
+#ifdef KERN_PROC_PATHNAME
+ static const int name[] = {
+ CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1,
+ };
+ char path[MAXPATHLEN];
+ size_t len;
+
+ len = sizeof(path);
+ if (sysctl(name, __arraycount(name), path, &len, NULL, 0) != -1)
+ pathname = path;
+#endif
+ return open(pathname, flags);
+}
+
+
static int __printflike(4, 5)
rasprintf(char **buf, size_t *bufsiz, size_t offs, const char *fmt, ...)
{
@@ -162,7 +182,7 @@ backtrace_symbols_fmt(void *const *trace, size_t len, const char *fmt)
symtab_t *st;
int fd;
- if ((fd = open(SELF, O_RDONLY)) != -1)
+ if ((fd = open_self(O_RDONLY)) != -1)
st = symtab_create(fd, -1, STT_FUNC);
else
st = NULL;