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/*
* Check handling of CLONE_PTRACE'ed processes.
*
* Copyright (c) 2015-2020 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 <string.h>
#include <sys/wait.h>
#include <unistd.h>
static siginfo_t sinfo;
#ifndef QUIET_ATTACH
# define QUIET_ATTACH 0
#endif
#ifndef QUIET_EXIT
# define QUIET_EXIT 0
#endif
static void
handler(const int no, siginfo_t *const si, void *const uc)
{
memcpy(&sinfo, si, sizeof(sinfo));
}
static int
child(void *const arg)
{
for(;;)
pause();
return 0;
}
#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 int sig = SIGUSR1;
sigset_t mask;
sigemptyset(&mask);
sigaddset(&mask, sig);
if (sigprocmask(SIG_UNBLOCK, &mask, NULL))
perror_msg_and_fail("sigprocmask");
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_PTRACE | SIGCHLD, 0);
if (pid < 0)
perror_msg_and_fail("clone");
static const struct sigaction sa = {
.sa_sigaction = handler,
.sa_flags = SA_SIGINFO
};
if (sigaction(SIGCHLD, &sa, NULL))
perror_msg_and_fail("sigaction");
kill(pid, sig);
FILE *const fp = fdopen(3, "a");
if (!fp)
perror_msg_and_fail("fdopen");
#if !QUIET_ATTACH
if (fprintf(fp, "%s: Detached unknown pid %d\n",
getenv("STRACE_EXE") ?: "strace", pid) < 0)
perror_msg_and_fail("fprintf");
#endif
int status;
while (wait(&status) != pid) {
if (errno != EINTR)
perror_msg_and_fail("wait");
}
if (!WIFSIGNALED(status) || WTERMSIG(status) != sig)
error_msg_and_fail("unexpected child exit status %d", status);
char utm_str[64];
char stm_str[64];
printf("--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_KILLED, si_pid=%d"
", si_uid=%d, si_status=%s, si_utime=%s, si_stime=%s} ---\n"
#if !QUIET_EXIT
"+++ exited with 0 +++\n"
#endif
, pid, geteuid(), "SIGUSR1",
clock_t_str((unsigned int) sinfo.si_utime, ARRSZ_PAIR(utm_str)),
clock_t_str((unsigned int) sinfo.si_stime, ARRSZ_PAIR(stm_str)));
return 0;
}
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