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e7679a5c82
/proc/${pid}/status got Kthread field recently.
Test that userspace program is not reported as kernel thread.
Test that kernel thread is reported as kernel thread.
Use kthreadd with pid 2 for this.
Link: https://lkml.kernel.org/r/818c4c41-8668-4566-97a9-7254abf819ee@p183
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Chunguang Wu <fullspring2018@gmail.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
37 lines
1.2 KiB
C
37 lines
1.2 KiB
C
/*
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* Copyright (c) 2024 Alexey Dobriyan <adobriyan@gmail.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/* Test that userspace program is not kernel thread. */
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#undef NDEBUG
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#include <assert.h>
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#include <fcntl.h>
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#include <string.h>
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#include <unistd.h>
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int main(void)
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{
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int fd = open("/proc/self/status", O_RDONLY);
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assert(fd >= 0);
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char buf[4096];
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ssize_t rv = read(fd, buf, sizeof(buf));
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assert(0 <= rv && rv < sizeof(buf));
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buf[rv] = '\0';
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/* This test is very much not kernel thread. */
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assert(strstr(buf, "Kthread:\t0\n"));
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return 0;
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}
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