2005-01-17 Andrew J. Schorr <ajschorr@alumni.princeton.edu>

	* log.h: Change prototype for zlog_backtrace_sigsafe to take additional
	  program_counter argument.
	* log.c: (zlog_backtrace_sigsafe) Add additional program_counter
	  argument.  If it is non-NULL, use backtrace_symbols_fd to resolve
	  the address.
	  (zlog_signal) Call zlog_backtrace_sigsafe with additional
	  program_counter argument.

	[pullup candidate]

1 files changed, 8 insertions, 2 deletions

diff --git a/lib/log.c b/lib/log.c
index f9f9766e..0a3a7fc1 100644
--- a/lib/log.c
+++ b/lib/log.c
@@ -312,7 +312,7 @@ zlog_signal(int signo, const char *action, siginfo_t *siginfo,
     }
 #undef DUMP
 
-  zlog_backtrace_sigsafe(PRI);
+  zlog_backtrace_sigsafe(PRI, program_counter);
 #undef PRI
 #undef LOC
 }
@@ -320,9 +320,10 @@ zlog_signal(int signo, const char *action, siginfo_t *siginfo,
 /* Log a backtrace using only async-signal-safe functions.
    Needs to be enhanced to support syslog logging. */
 void
-zlog_backtrace_sigsafe(int priority)
+zlog_backtrace_sigsafe(int priority, void *program_counter)
 {
 #ifdef HAVE_GLIBC_BACKTRACE
+  static const char pclabel[] = "Program counter: ";
   void *array[20];
   int size;
   char buf[100];
@@ -338,6 +339,11 @@ zlog_backtrace_sigsafe(int priority)
   s = str_append(LOC," stack frames:\n");
 
 #define DUMP(FP) { \
+  if (program_counter) \
+    { \
+      write(fileno(FP),pclabel,sizeof(pclabel)-1); \
+      backtrace_symbols_fd(&program_counter, 1, fileno(FP)); \
+    } \
   write(fileno(FP),buf,s-buf);	\
   backtrace_symbols_fd(array, size, fileno(FP)); \
 }