65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
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/*
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* Copyright © 2018 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 /proc/thread-self gives correct TGID/PID.
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#undef NDEBUG
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#include <assert.h>
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#include <sched.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/wait.h>
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#include "proc.h"
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int f(void *arg)
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{
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char buf1[64], buf2[64];
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pid_t pid, tid;
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ssize_t rv;
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pid = sys_getpid();
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tid = sys_gettid();
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snprintf(buf1, sizeof(buf1), "%u/task/%u", pid, tid);
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rv = readlink("/proc/thread-self", buf2, sizeof(buf2));
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assert(rv == strlen(buf1));
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buf2[rv] = '\0';
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assert(streq(buf1, buf2));
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if (arg)
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exit(0);
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return 0;
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}
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int main(void)
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{
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const int PAGE_SIZE = sysconf(_SC_PAGESIZE);
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pid_t pid;
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void *stack;
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/* main thread */
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f((void *)0);
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stack = mmap(NULL, 2 * PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
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assert(stack != MAP_FAILED);
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/* side thread */
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pid = clone(f, stack + PAGE_SIZE, CLONE_THREAD|CLONE_SIGHAND|CLONE_VM, (void *)1);
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assert(pid > 0);
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pause();
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return 0;
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}
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