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tests/clone_parent.c
73 строки
2 KB
Dmitry V. Levin
Update copyright headers
04 апр 2020, 01:58
04 апр 2020, 01:58
f17cbaa
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/* * Check handling of CLONE_PARENT'ed processes. * * Copyright (c) 2017-2020 The strace developers. * All rights reserved. * * SPDX-License-Identifier: GPL-2.0-or-later */ #include "tests.h" #include <errno.h> #include <sched.h> #include <signal.h> #include <stdio.h> #include <stdlib.h> #include <sys/wait.h> #include <unistd.h> #ifndef QUIET_MSG # define QUIET_MSG 0 #endif static int child(void *const arg) { return 42; } #ifdef IA64 extern int __clone2(int (*)(void *), void *, size_t, int, void *, ...); # define do_clone(fn_, stack_, size_, flags_, arg_, ...) \ __clone2((fn_), (stack_), (size_), (flags_), (arg_), ## __VA_ARGS__) #else # define do_clone(fn_, stack_, size_, flags_, arg_, ...) \ clone((fn_), (stack_), (flags_), (arg_), ## __VA_ARGS__) #endif int main(void) { const unsigned long child_stack_size = get_page_size(); void *const child_stack = tail_alloc(child_stack_size * 2) + child_stack_size; const pid_t pid = do_clone(child, child_stack, child_stack_size, CLONE_PARENT | SIGCHLD, 0); if (pid < 0) perror_msg_and_fail("clone"); int status; if (wait(&status) >= 0) error_msg_and_fail("unexpected return code from wait"); while (!kill(pid, 0)) ; if (errno != ESRCH) perror_msg_and_fail("kill"); FILE *const fp = fdopen(3, "a"); if (!fp) perror_msg_and_fail("fdopen"); #if !QUIET_MSG if (fprintf(fp, "%s: Exit of unknown pid %d ignored\n", getenv("STRACE_EXE") ?: "strace", pid) < 0) perror_msg_and_fail("fprintf"); #endif #if !QUIET_MSG puts("+++ exited with 0 +++"); #endif return 0; }