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41078907ee
Amazingly, some libc implementations don't call __NR_nanosleep syscall from
their nanosleep() APIs. Hammer it down with explicit syscall() call and never
get back to it again. Also simplify code for timespec initialization.
I verified that nanosleep is called w/ printk and in exactly same Linux image
that is used in Travis CI. So it should both sleep and call correct syscall.
v1->v2:
- math is too hard, fix usec -> nsec convertion (Martin);
- test_vmlinux has explicit nanosleep() call, convert that one as well.
Fixes: 4e1fd25d19 ("selftests/bpf: Fix usleep() implementation")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20200314002743.3782677-1-andriin@fb.com
43 lines
997 B
C
43 lines
997 B
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2020 Facebook */
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#include <test_progs.h>
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#include <time.h>
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#include "test_vmlinux.skel.h"
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#define MY_TV_NSEC 1337
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static void nsleep()
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{
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struct timespec ts = { .tv_nsec = MY_TV_NSEC };
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(void)syscall(__NR_nanosleep, &ts, NULL);
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}
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void test_vmlinux(void)
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{
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int duration = 0, err;
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struct test_vmlinux* skel;
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struct test_vmlinux__bss *bss;
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skel = test_vmlinux__open_and_load();
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if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))
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return;
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bss = skel->bss;
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err = test_vmlinux__attach(skel);
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if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))
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goto cleanup;
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/* trigger everything */
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nsleep();
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CHECK(!bss->tp_called, "tp", "not called\n");
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CHECK(!bss->raw_tp_called, "raw_tp", "not called\n");
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CHECK(!bss->tp_btf_called, "tp_btf", "not called\n");
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CHECK(!bss->kprobe_called, "kprobe", "not called\n");
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CHECK(!bss->fentry_called, "fentry", "not called\n");
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cleanup:
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test_vmlinux__destroy(skel);
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}
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