Refactor and expose core-dumping functionality

This commit exposes the functions that dump core outside utils.c.
can_dump_core gains a new parameter, "limit_kind", to allow either
the soft or hard limit to be checked, and its printing has separated
into the new function warn_cant_dump_core.  The new function
can_dump_core_warn does what can_dump_core previously did (print and
warn).

gdb/
2014-06-19  Gary Benson  <gbenson@redhat.com>

	* utils.h (resource_limit_kind): New enum.
	(can_dump_core): New declaration.
	(warn_cant_dump_core): Likewise.
	(dump_core): Likewise.
	* utils.c (dump_core): Made nonstatic.  Added new
	parameter "limit_kind".
	(can_dump_core): Made nonstatic. Moved printing code to...
	(warn_cant_dump_core): New function.
	(can_dump_core_warn): Likewise.
	(internal_vproblem): Replace calls to can_dump_core with
	calls to can_dump_core_warn.  Supply new argument to each.

3 files changed, 80 insertions, 12 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index d8a45c6..8e0de8a 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,19 @@
 2014-06-19  Gary Benson  <gbenson@redhat.com>
 
+	* utils.h (resource_limit_kind): New enum.
+	(can_dump_core): New declaration.
+	(warn_cant_dump_core): Likewise.
+	(dump_core): Likewise.
+	* utils.c (dump_core): Made nonstatic.  Added new
+	parameter "limit_kind".
+	(can_dump_core): Made nonstatic. Moved printing code to...
+	(warn_cant_dump_core): New function.
+	(can_dump_core_warn): Likewise.
+	(internal_vproblem): Replace calls to can_dump_core with
+	calls to can_dump_core_warn.  Supply new argument to each.
+
+2014-06-19  Gary Benson  <gbenson@redhat.com>
+
 	* utils.h (demangler_vwarning): New declaration.
 	(demangler_warning): Likewise.
 	* utils.c (struct internal_problem)
diff --git a/gdb/utils.c b/gdb/utils.c
index 7bc9b49..6f47cb0 100644
--- a/gdb/utils.c
+++ b/gdb/utils.c
@@ -600,7 +600,7 @@ error_stream (struct ui_file *stream)
 
 /* Dump core trying to increase the core soft limit to hard limit first.  */
 
-static void
+void
 dump_core (void)
 {
 #ifdef HAVE_SETRLIMIT
@@ -613,10 +613,12 @@ dump_core (void)
 }
 
 /* Check whether GDB will be able to dump core using the dump_core
-   function.  */
+   function.  Returns zero if GDB cannot or should not dump core.
+   If LIMIT_KIND is LIMIT_CUR the user's soft limit will be respected.
+   If LIMIT_KIND is LIMIT_MAX only the hard limit will be respected.  */
 
-static int
-can_dump_core (const char *reason)
+int
+can_dump_core (enum resource_limit_kind limit_kind)
 {
 #ifdef HAVE_GETRLIMIT
   struct rlimit rlim;
@@ -625,19 +627,47 @@ can_dump_core (const char *reason)
   if (getrlimit (RLIMIT_CORE, &rlim) != 0)
     return 1;
 
-  if (rlim.rlim_max == 0)
+  switch (limit_kind)
     {
-      fprintf_unfiltered (gdb_stderr,
-			  _("%s\nUnable to dump core, use `ulimit -c"
-			    " unlimited' before executing GDB next time.\n"),
-			  reason);
-      return 0;
+    case LIMIT_CUR:
+      if (rlim.rlim_cur == 0)
+	return 0;
+
+    case LIMIT_MAX:
+      if (rlim.rlim_max == 0)
+	return 0;
     }
 #endif /* HAVE_GETRLIMIT */
 
   return 1;
 }
 
+/* Print a warning that we cannot dump core.  */
+
+void
+warn_cant_dump_core (const char *reason)
+{
+  fprintf_unfiltered (gdb_stderr,
+		      _("%s\nUnable to dump core, use `ulimit -c"
+			" unlimited' before executing GDB next time.\n"),
+		      reason);
+}
+
+/* Check whether GDB will be able to dump core using the dump_core
+   function, and print a warning if we cannot.  */
+
+static int
+can_dump_core_warn (enum resource_limit_kind limit_kind,
+		    const char *reason)
+{
+  int core_dump_allowed = can_dump_core (limit_kind);
+
+  if (!core_dump_allowed)
+    warn_cant_dump_core (reason);
+
+  return core_dump_allowed;
+}
+
 /* Allow the user to configure the debugger behavior with respect to
    what to do when an internal problem is detected.  */
 
@@ -756,7 +786,7 @@ internal_vproblem (struct internal_problem *problem,
 
   if (problem->should_dump_core == internal_problem_ask)
     {
-      if (!can_dump_core (reason))
+      if (!can_dump_core_warn (LIMIT_MAX, reason))
 	dump_core_p = 0;
       else
 	{
@@ -767,7 +797,7 @@ internal_vproblem (struct internal_problem *problem,
 	}
     }
   else if (problem->should_dump_core == internal_problem_yes)
-    dump_core_p = can_dump_core (reason);
+    dump_core_p = can_dump_core_warn (LIMIT_MAX, reason);
   else if (problem->should_dump_core == internal_problem_no)
     dump_core_p = 0;
   else
diff --git a/gdb/utils.h b/gdb/utils.h
index 9a10281..a91f551 100644
--- a/gdb/utils.h
+++ b/gdb/utils.h
@@ -372,4 +372,28 @@ extern ULONGEST align_down (ULONGEST v, int n);
 
 extern LONGEST gdb_sign_extend (LONGEST value, int bit);
 
+/* Resource limits used by getrlimit and setrlimit.  */
+
+enum resource_limit_kind
+  {
+    LIMIT_CUR,
+    LIMIT_MAX
+  };
+
+/* Check whether GDB will be able to dump core using the dump_core
+   function.  Returns zero if GDB cannot or should not dump core.
+   If LIMIT_KIND is LIMIT_CUR the user's soft limit will be respected.
+   If LIMIT_KIND is LIMIT_MAX only the hard limit will be respected.  */
+
+extern int can_dump_core (enum resource_limit_kind limit_kind);
+
+/* Print a warning that we cannot dump core.  */
+
+extern void warn_cant_dump_core (const char *reason);
+
+/* Dump core trying to increase the core soft limit to hard limit
+   first.  */
+
+extern void dump_core (void);
+
 #endif /* UTILS_H */