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# Copyright (C) 2024-2025 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/>.
# Attach to a process, the executable for which has been deleted. On
# GNU/Linux GDB will spot the missing executable and fallback to use
# /proc/PID/exe instead.
require can_spawn_for_attach
require {istarget *-linux*}
standard_testfile
if { [build_executable "failed to prepare" $testfile $srcfile] } {
return -1
}
set test_spawn_id [spawn_wait_for_attach $binfile]
set testpid [spawn_id_get_pid $test_spawn_id]
# Move the executable rather than deleting it. This just to aid with
# debugging if someone needs to reproduce this test.
set binfile_moved ${binfile}_moved
# Don't move BINFILE as the kernel will just assign a new name to the
# same inode; and the /proc/PID/exe link will continue to point to the
# renamed inode.
remote_exec host "cp $binfile $binfile_moved"
remote_exec host "rm $binfile"
# Don't pass the executable when GDB starts. Instead rely on GDB
# finding the executable from the PID we attach too.
clean_restart
# Attach. GDB should spot that the executable is gone and fallback to
# use /proc/PID/exe.
set test "attach to process with deleted executable"
set re \
[multi_line \
"Attaching to process $decimal" \
"Reading symbols from (\[^\r\n\]+)[string_to_regexp ...]" \
".*"]
set filename ""
gdb_test_multiple "attach $testpid" $test {
-re -wrap $re {
set filename $expect_out(1,string)
pass $gdb_test_name
}
}
set test "filename /proc/PID/exe"
set re_nfs \[^\r\n\]+[string_to_regexp /.nfs]\[^\r\n\]+
if { [regexp $re_nfs $filename] } {
unsupported $test
} else {
gdb_assert { [string equal $filename /proc/${testpid}/exe] } $test
}
# Restart GDB.
clean_restart
# Setup an empty sysroot. GDB will fail to find the executable within
# the sysroot. Additionally, the presence of a sysroot should prevent
# GDB from trying to load the executable from /proc/PID/exe.
set sysroot [standard_output_file "sysroot"]
gdb_test_no_output "set sysroot $sysroot" \
"setup sysroot"
# Attach to the inferior. GDB should complain about failing to find
# the executable. It is the name of the executable that GDB doesn't
# find that we're interesting in here. For native targets GDB should
# be looking for BINFILE, not /proc/PID/exe.
#
# For extended-remote targets things are unfortunately harder. Native
# GDB looks for BINFILE because it understands that GDB will be
# looking in the sysroot. But remote GDB doesn't know if GDB is using
# a sysroot or not. As such, gdbserver will return /proc/PID/exe if
# it knows that the file has been deleted locally. This isn't great
# if GDB then plans to look in a sysroot, but equally, if the remote
# file has been deleted, then the name GDB will return, will have had
# " (deleted" appended, so we're unlikely to get a hit in the sysroot
# either way.
if { [target_info gdb_protocol] == "extended-remote" } {
set filename_re "/proc/$testpid/exe"
} else {
set filename_re "\[^\r\n\]+/${testfile} \\(deleted\\)"
}
verbose -log "APB: warning: No executable has been specified, and target executable $filename_re could not be found\\. Try using the \"file\" command\\."
gdb_test "attach $testpid" \
[multi_line \
"Attaching to process $decimal" \
"warning: No executable has been specified, and target executable $filename_re could not be found\\. Try using the \"file\" command\\." \
".*"] \
"attach to inferior"
# Check GDB hasn't managed to load an executable.
gdb_test "info inferior" \
"\\*\[^)\]+\\)\\s*" \
"confirm no executable is loaded."
# Cleanup.
kill_wait_spawned_process $test_spawn_id
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