# This testcase is part of GDB, the GNU debugger.

# Copyright 2016-2024 Free Software Foundation, Inc.

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Test GDB's ability to properly connect to GDBserver with no pre-opened
# symbol file.  If GDB is buggy, it will drop the connection when
# it attempts to open the symbol file indicated by GDBserver and fails.
#
# This test is only meaningful for standard remote connections.

load_lib gdbserver-support.exp

standard_testfile

require allow_gdbserver_tests

if { [build_executable "failed to prepare" $testfile $srcfile debug] } {
    return -1
}

# Test connecting GDB to GDBserver without loading a symbol file.
#
# SYSROOT is the desired sysroot string
#
# ACTION is the action to perform to the symbol file on the target.
# It can be either "permission" to deny access to the file or "delete"
# to remove the file.
#
proc connect_no_symbol_file { sysroot action } {
    global binfile

    with_test_prefix "setup" {
	# Restore original $binfile.
	gdb_remote_download build $binfile.bak $binfile

	# Copy the symbol file to the target.
	set target_exec [gdb_remote_download target $binfile]

	# Make sure we're disconnected, in case we're testing with an
	# extended-remote board, therefore already connected.
	gdb_test "disconnect" ".*"

	# Set sysroot to something non-target and possibly also invalid so that
	# GDB is unable to open the symbol file.
	gdb_test_no_output "set sysroot $sysroot" "adjust sysroot"

	# Start GDBserver.
	set res [gdbserver_start "" $target_exec]

	set gdbserver_protocol [lindex $res 0]
	set gdbserver_gdbport [lindex $res 1]

	# Perform test actions to the symbol file on the target.
	if {$action == "delete"} {
	  remote_file target delete $target_exec
	} elseif { $action == "permission" } {
	  remote_exec target "chmod 000 $target_exec"
	}
       
	# Connect to GDBserver.
	gdb_target_cmd $gdbserver_protocol $gdbserver_gdbport
    }

    # Check if GDB succeeded connecting to GDBserver by attempting to detach
    # from the process.
    # Use an explicit fail clause to prevent the implicit clause matching
    # "Ending remote debugging" from triggering, which would cause silent
    # failure.
    set ok 0
    gdb_test_multiple "detach" "" {
	-re "\r\nDetaching from \[^\r\n\]*" {
	    set ok 1
	    exp_continue
	}
	-re -wrap "" {
	}
    }
    gdb_assert $ok "connection to GDBserver succeeded"

    # GDB will register /proc/PID/exe as the executable for some of
    # these tests.  Once the test has finished the inferior will still
    # have /proc/PID/exe registered as its executable even though that
    # file no longer exists (most likely).  GDB will then complain
    # about the inferior's executable having disappeared.  Silence
    # these warnings by removing any registered file from the
    # executable.
    gdb_test "with confirm off -- file" \
	[multi_line \
	     "No executable file now\\." \
	     "No symbol file now\\."]
}

# Make sure we have the original symbol file in a safe place to copy from.
gdb_remote_download build $binfile $binfile.bak

# Start with no executable loaded.
clean_restart

# Run the test with different permutations.
foreach_with_prefix sysroot {"" "target:"} {
    foreach_with_prefix action {"permission" "delete"} {
	connect_no_symbol_file $sysroot $action
    }
}