[PATCH 4/5] Support 'info proc files' on live FreeBSD processes.

[John Baldwin <jhb@FreeBSD.org>]

This walks the list of struct kinfo_file objects returned by a call to
kinfo_getfile outputting a description of each open file descriptor.

gdb/ChangeLog:

	* fbsd-nat.c (fbsd_nat_target::info_proc): List open file
	descriptors for IP_FILES and IP_ALL.
---
 gdb/ChangeLog  |  5 +++++
 gdb/fbsd-nat.c | 44 +++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 48 insertions(+), 1 deletion(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index e3d9f40d02..fb62bc55ea 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2018-09-07  John Baldwin  <jhb@FreeBSD.org>
+
+	* fbsd-nat.c (fbsd_nat_target::info_proc): List open file
+	descriptors for IP_FILES and IP_ALL.
+
 2018-09-07  John Baldwin  <jhb@FreeBSD.org>
 
 	* fbsd-tdep.c (KF_FLAGS, KF_OFFSET, KF_VNODE_TYPE, KF_SOCK_DOMAIN)
diff --git a/gdb/fbsd-nat.c b/gdb/fbsd-nat.c
index a255318d14..d7db03336e 100644
--- a/gdb/fbsd-nat.c
+++ b/gdb/fbsd-nat.c
@@ -266,6 +266,9 @@ fbsd_nat_target::info_proc (const char *args, enum info_proc_what what)
   bool do_cmdline = false;
   bool do_cwd = false;
   bool do_exe = false;
+#ifdef HAVE_KINFO_GETFILE
+  bool do_files = false;
+#endif
 #ifdef HAVE_KINFO_GETVMMAP
   bool do_mappings = false;
 #endif
@@ -296,10 +299,18 @@ fbsd_nat_target::info_proc (const char *args, enum info_proc_what what)
     case IP_CWD:
       do_cwd = true;
       break;
+#ifdef HAVE_KINFO_GETFILE
+    case IP_FILES:
+      do_files = true;
+      break;
+#endif
     case IP_ALL:
       do_cmdline = true;
       do_cwd = true;
       do_exe = true;
+#ifdef HAVE_KINFO_GETFILE
+      do_files = true;
+#endif
 #ifdef HAVE_KINFO_GETVMMAP
       do_mappings = true;
 #endif
@@ -323,7 +334,7 @@ fbsd_nat_target::info_proc (const char *args, enum info_proc_what what)
 
   printf_filtered (_("process %d\n"), pid);
 #ifdef HAVE_KINFO_GETFILE
-  if (do_cwd || do_exe)
+  if (do_cwd || do_exe || do_files)
     fdtbl.reset (kinfo_getfile (pid, &nfd));
 #endif
 
@@ -375,6 +386,37 @@ fbsd_nat_target::info_proc (const char *args, enum info_proc_what what)
       else
 	warning (_("unable to fetch executable path name"));
     }
+#ifdef HAVE_KINFO_GETFILE
+  if (do_files)
+    {
+      struct kinfo_file *kf = fdtbl.get ();
+
+      if (nfd > 0)
+	{
+	  printf_filtered (_("Open files:\n\n"));
+	  printf_filtered ("  %6s %6s %10s %9s %s\n",
+			   "FD", "Type", "Offset", "Flags  ", "Name");
+	  for (int i = 0; i < nfd; i++, kf++)
+	    {
+	      printf_filtered ("  %6s %6s %10s %8s ",
+			       fbsd_file_fd (kf->kf_fd),
+			       fbsd_file_type (kf->kf_type, kf->kf_vnode_type),
+			       kf->kf_offset > -1 ? hex_string (kf->kf_offset)
+			       : "-",
+			       fbsd_file_flags (kf->kf_flags));
+	      if (kf->kf_type == KF_TYPE_SOCKET)
+		fbsd_print_socket (kf->kf_sock_domain, kf->kf_sock_type,
+				   kf->kf_sock_protocol, &kf->kf_sa_local,
+				   &kf->kf_sa_peer);
+	      else
+		printf_filtered ("%s", kf->kf_path);
+	      printf_filtered ("\n");
+	    }
+	}
+      else
+	warning (_("unable to fetch list of open files"));
+    }
+#endif
 #ifdef HAVE_KINFO_GETVMMAP
   if (do_mappings)
     {
-- 
2.18.0