gdbserver: turn target ops 'multifs_{open, readlink, unlink}' into methods

gdbserver/ChangeLog:
2020-02-20  Tankut Baris Aktemur  <tankut.baris.aktemur@intel.com>

	Turn process_stratum_target's multifs_open, multifs_readlink,
	multifs_unlink ops into methods of process_target.

	* target.h (struct process_stratum_target): Remove the target ops.
	(class process_target): Add the target ops.  Also add
	'supports_multifs'.
	* target.cc: Include "fcntl.h", "unistd.h", "sys/types.h", and
	"sys/stat.h".
	(process_target::supports_multifs): Define.
	(process_target::multifs_open): Define.
	(process_target::multifs_readlink): Define.
	(process_target::multifs_unlink): Define.

	Update the derived classes and callers below.

	* hostio.cc (handle_setfs): Update.
	(handle_open): Update.
	(handle_unlink): Update.
	(handle_readlink): Update.
	* linux-low.cc (linux_target_ops): Update.
	(linux_process_target::supports_multifs): Define.
	(linux_process_target::multifs_open): Define.
	(linux_process_target::multifs_readlink): Define.
	(linux_process_target::multifs_unlink): Define.
	* linux-low.h (class linux_process_target): Update.
	* lynx-low.cc (lynx_target_ops): Update.
	* nto-low.cc (nto_target_ops): Update.
	* win32-low.cc (win32_target_ops): Update.

1 files changed, 26 insertions, 3 deletions

diff --git a/gdbserver/linux-low.cc b/gdbserver/linux-low.cc
index 118aee9..c49ba89 100644
--- a/gdbserver/linux-low.cc
+++ b/gdbserver/linux-low.cc
@@ -6453,6 +6453,32 @@ linux_process_target::pid_to_exec_file (int pid)
   return linux_proc_pid_to_exec_file (pid);
 }
 
+bool
+linux_process_target::supports_multifs ()
+{
+  return true;
+}
+
+int
+linux_process_target::multifs_open (int pid, const char *filename,
+				    int flags, mode_t mode)
+{
+  return linux_mntns_open_cloexec (pid, filename, flags, mode);
+}
+
+int
+linux_process_target::multifs_unlink (int pid, const char *filename)
+{
+  return linux_mntns_unlink (pid, filename);
+}
+
+ssize_t
+linux_process_target::multifs_readlink (int pid, const char *filename,
+					char *buf, size_t bufsiz)
+{
+  return linux_mntns_readlink (pid, filename, buf, bufsiz);
+}
+
 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
 struct target_loadseg
 {
@@ -7483,9 +7509,6 @@ linux_get_hwcap2 (int wordsize)
 static linux_process_target the_linux_target;
 
 static process_stratum_target linux_target_ops = {
-  linux_mntns_open_cloexec,
-  linux_mntns_unlink,
-  linux_mntns_readlink,
   linux_breakpoint_kind_from_pc,
   linux_sw_breakpoint_from_kind,
   linux_proc_tid_get_name,