/*
|
* Check handling of CLONE_PTRACE'ed processes.
|
*
|
* Copyright (c) 2015-2017 The strace developers.
|
* All rights reserved.
|
*
|
* Redistribution and use in source and binary forms, with or without
|
* modification, are permitted provided that the following conditions
|
* are met:
|
* 1. Redistributions of source code must retain the above copyright
|
* notice, this list of conditions and the following disclaimer.
|
* 2. Redistributions in binary form must reproduce the above copyright
|
* notice, this list of conditions and the following disclaimer in the
|
* documentation and/or other materials provided with the distribution.
|
* 3. The name of the author may not be used to endorse or promote products
|
* derived from this software without specific prior written permission.
|
*
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
*/
|
|
#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;
|
|
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;
|
}
|
|
#define child_stack_size (get_page_size() / 2)
|
|
#ifdef IA64
|
extern int __clone2(int (*)(void *), void *, size_t, int, void *, ...);
|
# define clone(fn, child_stack, flags, arg) \
|
__clone2(fn, child_stack, child_stack_size, flags, arg)
|
#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 pid_t pid = clone(child, tail_alloc(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 (fprintf(fp, "%s: Detached unknown pid %d\n",
|
getenv("STRACE_EXE") ?: "strace", pid) < 0)
|
perror_msg_and_fail("fprintf");
|
|
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);
|
|
printf("--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_KILLED, si_pid=%d"
|
", si_uid=%u, si_status=%s, si_utime=%u, si_stime=%u} ---\n"
|
"+++ exited with 0 +++\n", pid, geteuid(), "SIGUSR1",
|
(unsigned int) sinfo.si_utime, (unsigned int) sinfo.si_stime);
|
|
return 0;
|
}
|
