44 lines
1.2 KiB
C
44 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2021, Oracle and/or its affiliates. */
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#include <test_progs.h>
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/* Test that verifies exception handling is working. fork()
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* triggers task_newtask tracepoint; that new task will have a
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* NULL pointer task_works, and the associated task->task_works->func
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* should not be NULL if task_works itself is non-NULL.
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*
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* So to verify exception handling we want to see a NULL task_works
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* and task_works->func; if we see this we can conclude that the
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* exception handler ran when we attempted to dereference task->task_works
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* and zeroed the destination register.
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*/
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#include "exhandler_kern.skel.h"
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void test_exhandler(void)
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{
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int err = 0, duration = 0, status;
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struct exhandler_kern *skel;
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pid_t cpid;
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skel = exhandler_kern__open_and_load();
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if (CHECK(!skel, "skel_load", "skeleton failed: %d\n", err))
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goto cleanup;
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skel->bss->test_pid = getpid();
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err = exhandler_kern__attach(skel);
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if (!ASSERT_OK(err, "attach"))
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goto cleanup;
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cpid = fork();
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if (!ASSERT_GT(cpid, -1, "fork failed"))
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goto cleanup;
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if (cpid == 0)
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_exit(0);
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waitpid(cpid, &status, 0);
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ASSERT_NEQ(skel->bss->exception_triggered, 0, "verify exceptions occurred");
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cleanup:
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exhandler_kern__destroy(skel);
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}
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