2009-02-06 Pedro Alves <pedro@codesourcery.com>

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

diff --git a/gdb/linux-nat.c b/gdb/linux-nat.c
index 33b05fa455d55542257040924a657112bb2ef1a1..0b098a07194592255f0f667c46792668e53f3b6a 100644 (file)
--- a/gdb/linux-nat.c
+++ b/gdb/linux-nat.c
@@ -3223,15 +3223,63 @@ linux_nat_mourn_inferior (struct target_ops *ops)
     linux_fork_mourn_inferior ();
 }
 
+static LONGEST
+linux_xfer_siginfo (struct target_ops *ops, enum target_object object,
+                    const char *annex, gdb_byte *readbuf,
+                   const gdb_byte *writebuf, ULONGEST offset, LONGEST len)
+{
+  struct lwp_info *lp;
+  LONGEST n;
+  int pid;
+  struct siginfo siginfo;
+
+  gdb_assert (object == TARGET_OBJECT_SIGNAL_INFO);
+  gdb_assert (readbuf || writebuf);
+
+  pid = GET_LWP (inferior_ptid);
+  if (pid == 0)
+    pid = GET_PID (inferior_ptid);
+
+  if (offset > sizeof (siginfo))
+    return -1;
+
+  errno = 0;
+  ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo);
+  if (errno != 0)
+    return -1;
+
+  if (offset + len > sizeof (siginfo))
+    len = sizeof (siginfo) - offset;
+
+  if (readbuf != NULL)
+    memcpy (readbuf, (char *)&siginfo + offset, len);
+  else
+    {
+      memcpy ((char *)&siginfo + offset, writebuf, len);
+      errno = 0;
+      ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo);
+      if (errno != 0)
+       return -1;
+    }
+
+  return len;
+}
+
 static LONGEST
 linux_nat_xfer_partial (struct target_ops *ops, enum target_object object,
                        const char *annex, gdb_byte *readbuf,
                        const gdb_byte *writebuf,
                        ULONGEST offset, LONGEST len)
 {
-  struct cleanup *old_chain = save_inferior_ptid ();
+  struct cleanup *old_chain;
   LONGEST xfer;
 
+  if (object == TARGET_OBJECT_SIGNAL_INFO)
+    return linux_xfer_siginfo (ops, object, annex, readbuf, writebuf,
+                              offset, len);
+
+  old_chain = save_inferior_ptid ();
+
   if (is_lwp (inferior_ptid))
     inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid));