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test: detect if we're running inside gdb and disable forking

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The Check test framework forks by default which is annoying when running gdb.
Try to detect whether we're inside gdb by ptracing ourselves. If that works,
we're not inside a debugger. If it doesn't, then assume we're inside a
debugger and set CK_FORK to "no".

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Peter Hutterer 2013-12-24 08:19:16 +10:00
parent 49f0b9300e
commit fd3118ea1a
2 changed files with 40 additions and 2 deletions
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5
libevdev/libevdev.h
View file

@ -177,8 +177,9 @@ extern "C" {
* git grep "suite_create"
* git grep "tcase_create"
*
* By default, check forks, making debugging harder. Run gdb as below to avoid
* forking.
* By default, Check forks, making debugging harder. The test suite tries to detect
* if it is running inside gdb and disable forking. If that doesn't work for
* some reason, run gdb as below to avoid forking.
*
* sudo CK_FORK=no CK_RUN_TEST="test case name" gdb ./test/test-libevdev
*

37
test/test-main.c
View file

@ -22,6 +22,10 @@
#include <config.h>
#include <check.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ptrace.h>
#include <sys/wait.h>
extern Suite *event_name_suite(void);
extern Suite *event_code_suite(void);
@ -31,9 +35,42 @@ extern Suite *libevdev_has_event_test(void);
extern Suite *libevdev_events(void);
extern Suite *uinput_suite(void);
static int
is_debugger_attached(void)
{
int status;
int rc;
int pid = fork();
if (pid == -1)
return 0;
if (pid == 0) {
int ppid = getppid();
if (ptrace(PTRACE_ATTACH, ppid, NULL, NULL) == 0) {
waitpid(ppid, NULL, 0);
ptrace(PTRACE_CONT, NULL, NULL);
ptrace(PTRACE_DETACH, ppid, NULL, NULL);
rc = 0;
} else
rc = 1;
_exit(rc);
} else {
waitpid(pid, &status, 0);
rc = WEXITSTATUS(status);
}
return rc;
}
int main(int argc, char **argv)
{
int failed;
if (is_debugger_attached())
setenv("CK_FORK", "no", 0);
Suite *s = libevdev_has_event_test();
SRunner *sr = srunner_create(s);
srunner_add_suite(sr, libevdev_events());