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[thirdparty/glibc.git] / sysdeps / unix / sysv / linux / libc_fatal.c

diff --git a/sysdeps/unix/sysv/linux/libc_fatal.c b/sysdeps/unix/sysv/linux/libc_fatal.c
index 898be00604875a31708bdad14273913e12451a1b..58a5a7f83870c73978c774b218c789a42fcc128c 100644 (file)
--- a/sysdeps/unix/sysv/linux/libc_fatal.c
+++ b/sysdeps/unix/sysv/linux/libc_fatal.c
@@ -1,4 +1,5 @@
-/* Copyright (C) 1993-1995,1997,2000,2002-2004 Free Software Foundation, Inc.
+/* Copyright (C) 1993-1995,1997,2000,2002-2005,2009,2011
+   Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -12,24 +13,24 @@
    Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, write to the Free
-   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-   02111-1307 USA.  */
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
 
+#include <atomic.h>
 #include <errno.h>
 #include <fcntl.h>
+#include <ldsodefs.h>
 #include <paths.h>
 #include <stdarg.h>
+#include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sysdep.h>
 #include <unistd.h>
+#include <sys/mman.h>
 #include <sys/syslog.h>
-#ifndef ABORT_INSTRUCTION
-/* No such instruction is available.  */
-# define ABORT_INSTRUCTION
-#endif
+#include <execinfo.h>
 
 /* Abort with an error message.  */
 #include <not-cancel.h>
@@ -133,6 +134,30 @@ __libc_message (int do_abort, const char *fmt, ...)
 
       if (cnt == total)
        written = true;
+
+      if (do_abort)
+       {
+         total = ((total + 1 + GLRO(dl_pagesize) - 1)
+                  & ~(GLRO(dl_pagesize) - 1));
+         struct abort_msg_s *buf = __mmap (NULL, total,
+                                           PROT_READ | PROT_WRITE,
+                                           MAP_ANON | MAP_PRIVATE, -1, 0);
+         if (__builtin_expect (buf != MAP_FAILED, 1))
+           {
+             buf->size = total;
+             char *wp = buf->msg;
+             for (int cnt = 0; cnt < nlist; ++cnt)
+               wp = mempcpy (wp, iov[cnt].iov_base, iov[cnt].iov_len);
+             *wp = '\0';
+
+             /* We have to free the old buffer since the application might
+                catch the SIGABRT signal.  */
+             struct abort_msg_s *old = atomic_exchange_acq (&__abort_msg,
+                                                            buf);
+             if (old != NULL)
+               __munmap (old, old->size);
+           }
+       }
     }
 
   va_end (ap);
@@ -141,9 +166,36 @@ __libc_message (int do_abort, const char *fmt, ...)
   if (! written)
     vsyslog (LOG_ERR, fmt, ap_copy);
 
+  va_end (ap_copy);
+
   if (do_abort)
-    /* Terminate the process.  */
-    abort ();
+    {
+      if (do_abort > 1 && written)
+       {
+         void *addrs[64];
+#define naddrs (sizeof (addrs) / sizeof (addrs[0]))
+         int n = __backtrace (addrs, naddrs);
+         if (n > 2)
+           {
+#define strnsize(str) str, strlen (str)
+#define writestr(str) write_not_cancel (fd, str)
+             writestr (strnsize ("======= Backtrace: =========\n"));
+             __backtrace_symbols_fd (addrs + 1, n - 1, fd);
+
+             writestr (strnsize ("======= Memory map: ========\n"));
+             int fd2 = open_not_cancel_2 ("/proc/self/maps", O_RDONLY);
+             char buf[1024];
+             ssize_t n2;
+             while ((n2 = read_not_cancel (fd2, buf, sizeof (buf))) > 0)
+               if (write_not_cancel (fd, buf, n2) != n2)
+                 break;
+             close_not_cancel_no_status (fd2);
+           }
+       }
+
+      /* Terminate the process.  */
+      abort ();
+    }
 }
 
 
@@ -151,6 +203,8 @@ void
 __libc_fatal (message)
      const char *message;
 {
-  __libc_message (1, "%s", message);
+  /* The loop is added only to keep gcc happy.  */
+  while (1)
+    __libc_message (1, "%s", message);
 }
 libc_hidden_def (__libc_fatal)