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/*
* Check decoding of wait4 syscall.
*
* Copyright (c) 2015-2016 Dmitry V. Levin <ldv@strace.io>
* Copyright (c) 2016-2020 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include "scno.h"
#ifdef __NR_wait4
# include <assert.h>
# include <signal.h>
# include <stdio.h>
# include <unistd.h>
# include <sys/wait.h>
# include "kernel_rusage.h"
static const char *
sprint_rusage(const kernel_rusage_t *const ru)
{
static char buf[1024];
snprintf(buf, sizeof(buf),
"{ru_utime={tv_sec=%llu, tv_usec=%llu}"
", ru_stime={tv_sec=%llu, tv_usec=%llu}"
# if VERBOSE
", ru_maxrss=%llu"
", ru_ixrss=%llu"
", ru_idrss=%llu"
", ru_isrss=%llu"
", ru_minflt=%llu"
", ru_majflt=%llu"
", ru_nswap=%llu"
", ru_inblock=%llu"
", ru_oublock=%llu"
", ru_msgsnd=%llu"
", ru_msgrcv=%llu"
", ru_nsignals=%llu"
", ru_nvcsw=%llu"
", ru_nivcsw=%llu}"
# else
", ...}"
# endif
, zero_extend_signed_to_ull(ru->ru_utime.tv_sec)
, zero_extend_signed_to_ull(ru->ru_utime.tv_usec)
, zero_extend_signed_to_ull(ru->ru_stime.tv_sec)
, zero_extend_signed_to_ull(ru->ru_stime.tv_usec)
# if VERBOSE
, zero_extend_signed_to_ull(ru->ru_maxrss)
, zero_extend_signed_to_ull(ru->ru_ixrss)
, zero_extend_signed_to_ull(ru->ru_idrss)
, zero_extend_signed_to_ull(ru->ru_isrss)
, zero_extend_signed_to_ull(ru->ru_minflt)
, zero_extend_signed_to_ull(ru->ru_majflt)
, zero_extend_signed_to_ull(ru->ru_nswap)
, zero_extend_signed_to_ull(ru->ru_inblock)
, zero_extend_signed_to_ull(ru->ru_oublock)
, zero_extend_signed_to_ull(ru->ru_msgsnd)
, zero_extend_signed_to_ull(ru->ru_msgrcv)
, zero_extend_signed_to_ull(ru->ru_nsignals)
, zero_extend_signed_to_ull(ru->ru_nvcsw)
, zero_extend_signed_to_ull(ru->ru_nivcsw)
# endif
);
return buf;
}
static const char *errstr;
static long
k_wait4(const unsigned int pid, void const *wstatus,
const unsigned int options, void const *ru)
{
const kernel_ulong_t fill = (kernel_ulong_t) 0xdefaced00000000ULL;
const kernel_ulong_t bad = (kernel_ulong_t) 0xbadc0dedbadc0dedULL;
const kernel_ulong_t arg1 = fill | pid;
const kernel_ulong_t arg2 = (uintptr_t) wstatus;
const kernel_ulong_t arg3 = fill | options;
const kernel_ulong_t arg4 = (uintptr_t) ru;
const long rc = syscall(__NR_wait4, arg1, arg2, arg3, arg4, bad, bad);
errstr = sprintrc(rc);
return rc;
}
static pid_t
do_wait4(pid_t pid, int *wstatus, int options, kernel_rusage_t *ru)
{
sigset_t mask = {};
sigaddset(&mask, SIGCHLD);
assert(sigprocmask(SIG_BLOCK, &mask, NULL) == 0);
pid_t rc = k_wait4(pid, wstatus, options, ru);
assert(sigprocmask(SIG_UNBLOCK, &mask, NULL) == 0);
return rc;
}
int
main(void)
{
tprintf("%s", "");
int fds[2];
if (pipe(fds))
perror_msg_and_fail("pipe");
pid_t pid;
pid = fork();
if (pid < 0)
perror_msg_and_fail("fork");
if (!pid) {
char c;
(void) close(1);
assert(read(0, &c, sizeof(c)) == 1);
return 42;
}
(void) close(0);
TAIL_ALLOC_OBJECT_CONST_PTR(int, s);
if (k_wait4(pid, s, WNOHANG|__WALL, NULL))
perror_msg_and_fail("wait4 #1");
tprintf("wait4(%d, %p, WNOHANG|__WALL, NULL) = 0\n", pid, s);
TAIL_ALLOC_OBJECT_CONST_PTR(kernel_rusage_t, rusage);
if (k_wait4(pid, s, WNOHANG|__WALL, rusage))
perror_msg_and_fail("wait4 #2");
tprintf("wait4(%d, %p, WNOHANG|__WALL, %p) = 0\n", pid, s, rusage);
assert(write(1, "", 1) == 1);
(void) close(1);
assert(do_wait4(pid, s, 0, rusage) == pid);
assert(WIFEXITED(*s) && WEXITSTATUS(*s) == 42);
tprintf("wait4(%d, [{WIFEXITED(s) && WEXITSTATUS(s) == 42}], 0, %s)"
" = %d\n", pid, sprint_rusage(rusage), pid);
pid = fork();
if (pid < 0)
perror_msg_and_fail("fork");
if (!pid) {
(void) raise(SIGUSR1);
return 1;
}
assert(do_wait4(pid, s, __WALL, rusage) == pid);
assert(WIFSIGNALED(*s) && WTERMSIG(*s) == SIGUSR1);
tprintf("wait4(%d, [{WIFSIGNALED(s) && WTERMSIG(s) == SIGUSR1}]"
", __WALL, %s) = %d\n", pid, sprint_rusage(rusage), pid);
if (pipe(fds))
perror_msg_and_fail("pipe");
pid = fork();
if (pid < 0)
perror_msg_and_fail("fork");
if (!pid) {
(void) close(1);
raise(SIGSTOP);
char c;
assert(read(0, &c, sizeof(c)) == 1);
return 0;
}
(void) close(0);
assert(do_wait4(pid, s, WSTOPPED, rusage) == pid);
assert(WIFSTOPPED(*s) && WSTOPSIG(*s) == SIGSTOP);
tprintf("wait4(%d, [{WIFSTOPPED(s) && WSTOPSIG(s) == SIGSTOP}]"
", WSTOPPED, %s) = %d\n", pid, sprint_rusage(rusage), pid);
if (kill(pid, SIGCONT))
perror_msg_and_fail("kill(SIGCONT)");
# if defined WCONTINUED && defined WIFCONTINUED
assert(do_wait4(pid, s, WCONTINUED, rusage) == pid);
assert(WIFCONTINUED(*s));
tprintf("wait4(%d, [{WIFCONTINUED(s)}], WCONTINUED"
", %s) = %d\n", pid, sprint_rusage(rusage), pid);
# endif /* WCONTINUED && WIFCONTINUED */
assert(write(1, "", 1) == 1);
(void) close(1);
assert(do_wait4(pid, s, 0, rusage) == pid);
assert(WIFEXITED(*s) && WEXITSTATUS(*s) == 0);
tprintf("wait4(%d, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0"
", %s) = %d\n", pid, sprint_rusage(rusage), pid);
assert(k_wait4(-1, s, WNOHANG|WSTOPPED|__WALL, rusage) == -1);
tprintf("wait4(-1, %p, WNOHANG|WSTOPPED|__WALL, %p) = %s\n",
s, rusage, errstr);
tprintf("%s\n", "+++ exited with 0 +++");
return 0;
}
#else
SKIP_MAIN_UNDEFINED("__NR_wait4")
#endif /* __NR_wait4 */
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