PR server/16255: gdbserver cannot attach to a second inferior that is multi-threaded.

[deliverable/binutils-gdb.git] / gdb / gdbserver / linux-low.h

diff --git a/gdb/gdbserver/linux-low.h b/gdb/gdbserver/linux-low.h
index a8de3780c2ea3db0f0ebcb8203b5d614a792d507..cd3001dec95acb85ea1367e04ddbfaac3deb5390 100644 (file)
--- a/gdb/gdbserver/linux-low.h
+++ b/gdb/gdbserver/linux-low.h
@@ -1,5 +1,5 @@
 /* Internal interfaces for the GNU/Linux specific target code for gdbserver.
-   Copyright (C) 2002-2013 Free Software Foundation, Inc.
+   Copyright (C) 2002-2014 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -22,8 +22,9 @@
 #include "gdbthread.h"
 #include "gdb_proc_service.h"
 
-#define PTRACE_ARG3_TYPE void *
-#define PTRACE_ARG4_TYPE void *
+/* Included for ptrace type definitions.  */
+#include "linux-ptrace.h"
+
 #define PTRACE_XFER_TYPE long
 
 #ifdef HAVE_LINUX_REGSETS
@@ -222,19 +223,23 @@ struct linux_target_ops
 
 extern struct linux_target_ops the_low_target;
 
-#define ptid_of(proc) ((proc)->head.id)
-#define pid_of(proc) ptid_get_pid ((proc)->head.id)
-#define lwpid_of(proc) ptid_get_lwp ((proc)->head.id)
+#define get_thread_lwp(thr) ((struct lwp_info *) (inferior_target_data (thr)))
+#define get_lwp_thread(lwp) ((lwp)->thread)
+
+/* This struct is recorded in the target_data field of struct thread_info.
+
+   On linux ``all_threads'' is keyed by the LWP ID, which we use as the
+   GDB protocol representation of the thread ID.  Threads also have
+   a "process ID" (poorly named) which is (presently) the same as the
+   LWP ID.
 
-#define get_lwp(inf) ((struct lwp_info *)(inf))
-#define get_thread_lwp(thr) (get_lwp (inferior_target_data (thr)))
-#define get_lwp_thread(proc) ((struct thread_info *)                   \
-                             find_inferior_id (&all_threads,           \
-                                               get_lwp (proc)->head.id))
+   There is also ``all_processes'' is keyed by the "overall process ID",
+   which GNU/Linux calls tgid, "thread group ID".  */
 
 struct lwp_info
 {
-  struct inferior_list_entry head;
+  /* Backlink to the parent object.  */
+  struct thread_info *thread;
 
   /* If this flag is set, the next SIGSTOP will be ignored (the
      process will be immediately resumed).  This means that either we
@@ -336,11 +341,18 @@ struct lwp_info
   struct arch_lwp_info *arch_private;
 };
 
-extern struct inferior_list all_lwps;
-
 int linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine);
 
-void linux_attach_lwp (unsigned long pid);
+/* Attach to PTID.  Returns 0 on success, non-zero otherwise (an
+   errno).  */
+int linux_attach_lwp (ptid_t ptid);
+
+/* Return the reason an attach failed, in string form.  ERR is the
+   error returned by linux_attach_lwp (an errno).  This string should
+   be copied into a buffer by the client if the string will not be
+   immediately used, or if it must persist.  */
+char *linux_attach_fail_reason_string (ptid_t ptid, int err);
+
 struct lwp_info *find_lwp_pid (ptid_t ptid);
 void linux_stop_lwp (struct lwp_info *lwp);