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selftests/nolibc: exit with poweroff on success when getpid() == 1

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The idea is to ease automated testing under qemu. If the test succeeds
while running as PID 1, indicating the system was booted with init=/test,
let's just power off so that qemu can exit with a successful code. In
other situations it will exit and provoke a panic, which may be caught
for example with CONFIG_PVPANIC.

Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Willy Tarreau 2022-07-19 23:44:40 +02:00 committed by Paul E. McKenney
parent 95bc989488
commit f49896d7d9
1 changed files with 14 additions and 0 deletions
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14
tools/testing/selftests/nolibc/nolibc-test.c
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@ -626,6 +626,20 @@ int main(int argc, char **argv, char **envp)
}
printf("Total number of errors: %d\n", ret);
if (getpid() == 1) {
/* we're running as init, there's no other process on the
* system, thus likely started from a VM for a quick check.
* Exiting will provoke a kernel panic that may be reported
* as an error by Qemu or the hypervisor, while stopping
* cleanly will often be reported as a success. This allows
* to use the output of this program for bisecting kernels.
*/
printf("Leaving init with final status: %d\n", !!ret);
if (ret == 0)
reboot(LINUX_REBOOT_CMD_POWER_OFF);
}
printf("Exiting with status %d\n", !!ret);
return !!ret;
}