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tests/kill_child.c
69 строк
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Dmitry V. Levin
Update copyright headers
22 янв 2025, 11:00
22 янв 2025, 11:00
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/* * Check for the corner case that previously lead to segfault * due to an attempt to access uninitialised tcp->s_ent. * * 13994 ???( <unfinished ...> * ... * 13994 <... ??? resumed>) = ? * * Copyright (c) 2019-2025 The strace developers. * All rights reserved. * * SPDX-License-Identifier: GPL-2.0-or-later */ #include "tests.h" #include <sched.h> #include <signal.h> #include <unistd.h> #include <sys/mman.h> #include <sys/wait.h> #define ITERS 10000 #define SC_ITERS 10000 int main(void) { volatile sig_atomic_t *const mem = mmap(NULL, get_page_size(), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0); if (mem == MAP_FAILED) perror_msg_and_fail("mmap"); for (unsigned int i = 0; i < ITERS; ++i) { mem[0] = mem[1] = 0; const pid_t pid = fork(); if (pid < 0) perror_msg_and_fail("fork"); if (!pid) { /* wait for the parent */ while (!mem[0]) ; /* let the parent know we are running */ mem[1] = 1; for (unsigned int j = 0; j < SC_ITERS; j++) sched_yield(); pause(); return 0; } /* let the child know we are running */ mem[0] = 1; /* wait for the child */ while (!mem[1]) ; if (kill(pid, SIGKILL)) perror_msg_and_fail("kill"); if (wait(NULL) != pid) perror_msg_and_fail("wait"); } return 0; }