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# Copyright 2016-2021 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/>.
# When we intercept a fork/vfork with a catchpoint, the child is left
# stopped. At that point, if we kill the parent, we should kill the
# child as well. This test makes sure that works. See PR gdb/19494.
# The main idea of the test is make sure that when the program stops
# for a fork catchpoint, and the user kills the parent, gdb also kills
# the unfollowed fork child. Since the child hasn't been added as an
# inferior at that point, we need some other portable way to detect
# that the child is gone. The test uses a pipe for that. The program
# forks twice, so you have grandparent, child and grandchild. The
# grandchild inherits the write side of the pipe. The grandparent
# hangs reading from the pipe, since nothing ever writes to it. If,
# when GDB kills the child, it also kills the grandchild, then the
# grandparent's pipe read returns 0/EOF and the test passes.
# Otherwise, if GDB doesn't kill the grandchild, then the pipe read
# never returns and the test times out.
standard_testfile
# Build two programs -- one for fork, and another for vfork.
set testfile_fork "${testfile}-fork"
set testfile_vfork "${testfile}-vfork"
foreach kind {"fork" "vfork"} {
set compile_options "debug additional_flags=-DFORK=$kind"
set testfile [set testfile_$kind]
if {[build_executable $testfile.exp $testfile ${srcfile} \
${compile_options}] == -1} {
untested "failed to compile"
return -1
}
}
# The test proper. FORK_KIND is either "fork" or "vfork". EXIT_KIND
# is either "exit" (run the parent to exit) or "kill" (kill parent).
proc do_test {fork_kind exit_kind} {
global testfile testfile_$fork_kind
set testfile [set testfile_$fork_kind]
with_test_prefix "$fork_kind" {
clean_restart $testfile
if ![runto_main] {
untested "could not run to main"
return -1
}
gdb_test_no_output "set follow-fork child"
gdb_test_no_output "set detach-on-fork off"
gdb_test "catch $fork_kind" "Catchpoint .*($fork_kind).*"
gdb_test "continue" \
"Catchpoint \[0-9\]* \\(${fork_kind}ed process \[0-9\]*\\),.*" \
"continue to child ${fork_kind}"
gdb_test "continue" \
"Catchpoint \[0-9\]* \\(${fork_kind}ed process \[0-9\]*\\),.*" \
"continue to grandchild ${fork_kind}"
gdb_test "kill inferior 2" "" "kill child" \
"Kill the program being debugged.*y or n. $" "y"
gdb_test "inferior 1" "Switching to inferior 1 .*" "switch to parent"
if {$exit_kind == "exit"} {
gdb_test "break grandparent_done" "Breakpoint .*"
gdb_test "continue" "hit Breakpoint .*, grandparent_done.*"
} elseif {$exit_kind == "kill"} {
gdb_test "kill" "" "kill parent" \
"Kill the program being debugged.*y or n. $" "y"
} else {
perror "unreachable"
}
}
}
foreach_with_prefix fork-kind {"fork" "vfork"} {
foreach_with_prefix exit-kind {"exit" "kill"} {
do_test ${fork-kind} ${exit-kind}
}
}
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