/* * Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com> * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ // Test that /proc/thread-self gives correct TGID/PID. #undef NDEBUG #include <assert.h> #include <sched.h> #include <stdio.h> #include <unistd.h> #include <sys/mman.h> #include <sys/wait.h> #include "proc.h" int f(void *arg) { char buf1[64], buf2[64]; pid_t pid, tid; ssize_t rv; pid = sys_getpid(); tid = sys_gettid(); snprintf(buf1, sizeof(buf1), "%u/task/%u", pid, tid); rv = readlink("/proc/thread-self", buf2, sizeof(buf2)); assert(rv == strlen(buf1)); buf2[rv] = '\0'; assert(streq(buf1, buf2)); if (arg) exit(0); return 0; } int main(void) { const int PAGE_SIZE = sysconf(_SC_PAGESIZE); pid_t pid; void *stack; /* main thread */ f((void *)0); stack = mmap(NULL, 2 * PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); assert(stack != MAP_FAILED); /* side thread */ pid = clone(f, stack + PAGE_SIZE, CLONE_THREAD|CLONE_SIGHAND|CLONE_VM, (void *)1); assert(pid > 0); pause(); return 0; }