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| 2 | * Copyright © 2018 Alexey Dobriyan <[email protected]>
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| 3 | *
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| 4 | * Permission to use, copy, modify, and distribute this software for any
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| 5 | * purpose with or without fee is hereby granted, provided that the above
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| 6 | * copyright notice and this permission notice appear in all copies.
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| 7 | *
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| 8 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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| 9 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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| 10 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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| 11 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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| 12 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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| 13 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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| 14 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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| 15 |
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| 16 | |
| 17 | #undef NDEBUG
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| 18 | #include <assert.h>
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| 19 | #include <sched.h>
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| 20 | #include <stdio.h>
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| 21 | #include <unistd.h>
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| 22 | #include <sys/mman.h>
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| 23 | #include <sys/wait.h>
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| 24 |
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| 25 | #include "proc.h"
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| 26 |
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| 27 | int f(void *arg)
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| 28 | {
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| 29 | char buf1[64], buf2[64];
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| 30 | pid_t pid, tid;
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| 31 | ssize_t rv;
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| 32 |
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| 33 | pid = sys_getpid();
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| 34 | tid = sys_gettid();
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| 35 | snprintf(buf1, sizeof(buf1), "%u/task/%u", pid, tid);
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| 36 |
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| 37 | rv = readlink("/proc/thread-self", buf2, sizeof(buf2));
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| 38 | assert(rv == strlen(buf1));
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| 39 | buf2[rv] = '\0';
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| 40 | assert(streq(buf1, buf2));
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| 41 |
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| 42 | if (arg)
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| 43 | exit(0);
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| 44 | return 0;
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| 45 | }
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| 46 |
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| 47 | int main(void)
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| 48 | {
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| 49 | const int PAGE_SIZE = sysconf(_SC_PAGESIZE);
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| 50 | pid_t pid;
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| 51 | void *stack;
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| 52 |
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| 53 |
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| 54 | f((void *)0);
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| 55 |
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| 56 | stack = mmap(NULL, 2 * PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
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| 57 | assert(stack != MAP_FAILED);
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| 58 |
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| 59 | pid = clone(f, stack + PAGE_SIZE, CLONE_THREAD|CLONE_SIGHAND|CLONE_VM, (void *)1);
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| 60 | assert(pid > 0);
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| 61 | pause();
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| 62 |
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| 63 | return 0;
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| 64 | }
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