forked from Imagelibrary/binutils-gdb
d8b79a1f24
Cygwin debugging does not support follow fork. There is currently no
interface between the debugger and the Cygwin runtime to be able to
intercept forks and execs. Consequently, testcases that try to
exercise fork/exec all FAIL, and several hit long cascading timeouts.
Add a new allow_fork_tests procedure, meant be be used with require,
and sprinkle it throughout testcases that exercise fork.
Note that some tests currently are skipped on targets other than
Linux, with something like:
# Until "set follow-fork-mode" and "catch vfork" are implemented on
# other targets...
#
if {![istarget "*-linux*"]} {
continue
}
However, some BSD ports also support fork debugging nowadays, and the
testcases were never adjusted... That is why the new allow_fork_tests
procedure doesn't look for linux.
With this patch, on Cygwin, I get this:
$ make check TESTS="*/*fork*.exp"
...
=== gdb Summary ===
# of expected passes 6
# of untested testcases 1
# of unsupported tests 31
Change-Id: I0c5e8c574d1f61b28d370c22a0b0b6bc3efaf978
100 lines
3.4 KiB
Plaintext
100 lines
3.4 KiB
Plaintext
# Copyright 2016-2025 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# When we intercept a fork/vfork with a catchpoint, the child is left
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# stopped. At that point, if we kill the parent, we should kill the
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# child as well. This test makes sure that works. See PR gdb/19494.
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# The main idea of the test is make sure that when the program stops
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# for a fork catchpoint, and the user kills the parent, gdb also kills
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# the unfollowed fork child. Since the child hasn't been added as an
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# inferior at that point, we need some other portable way to detect
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# that the child is gone. The test uses a pipe for that. The program
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# forks twice, so you have grandparent, child and grandchild. The
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# grandchild inherits the write side of the pipe. The grandparent
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# hangs reading from the pipe, since nothing ever writes to it. If,
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# when GDB kills the child, it also kills the grandchild, then the
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# grandparent's pipe read returns 0/EOF and the test passes.
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# Otherwise, if GDB doesn't kill the grandchild, then the pipe read
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# never returns and the test times out.
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standard_testfile
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require allow_fork_tests
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# Build two programs -- one for fork, and another for vfork.
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set testfile_fork "${testfile}-fork"
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set testfile_vfork "${testfile}-vfork"
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foreach kind {"fork" "vfork"} {
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set compile_options "debug additional_flags=-DFORK=$kind"
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set testfile [set testfile_$kind]
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if {[build_executable $testfile.exp $testfile ${srcfile} \
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${compile_options}] == -1} {
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untested "failed to compile"
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return -1
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}
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}
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# The test proper. FORK_KIND is either "fork" or "vfork". EXIT_KIND
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# is either "exit" (run the parent to exit) or "kill" (kill parent).
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proc do_test {fork_kind exit_kind} {
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global testfile testfile_$fork_kind
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set testfile [set testfile_$fork_kind]
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with_test_prefix "$fork_kind" {
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clean_restart $testfile
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if ![runto_main] {
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return -1
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}
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gdb_test_no_output "set follow-fork child"
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gdb_test_no_output "set detach-on-fork off"
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gdb_test "catch $fork_kind" "Catchpoint .*($fork_kind).*"
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gdb_test "continue" \
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"Catchpoint \[0-9\]* \\(${fork_kind}ed process \[0-9\]*\\),.*" \
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"continue to child ${fork_kind}"
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gdb_test "continue" \
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"Catchpoint \[0-9\]* \\(${fork_kind}ed process \[0-9\]*\\),.*" \
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"continue to grandchild ${fork_kind}"
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gdb_test "kill inferior 2" "" "kill child"
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gdb_test "inferior 1" "Switching to inferior 1 .*" "switch to parent"
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if {$exit_kind == "exit"} {
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gdb_test "break grandparent_done" "Breakpoint .*"
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gdb_test "continue" "hit Breakpoint .*, grandparent_done.*"
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} elseif {$exit_kind == "kill"} {
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gdb_test "kill" "" "kill parent" \
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"Kill the program being debugged.*y or n. $" "y"
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} else {
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perror "unreachable"
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}
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}
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}
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foreach_with_prefix fork-kind {"fork" "vfork"} {
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foreach_with_prefix exit-kind {"exit" "kill"} {
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do_test ${fork-kind} ${exit-kind}
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}
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}
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