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/*
* Check that fault injection works properly.
*
* Copyright (c) 2016 Dmitry V. Levin <ldv@strace.io>
* Copyright (c) 2016-2021 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/uio.h>
#include <sys/wait.h>
static int exp_fd;
static int got_fd;
static int out_fd;
#define DEFAULT_ERRNO ENOSYS
static const char *errstr;
static int is_raw, err;
static void
invoke(int iter, int fail)
{
static char buf[sizeof(int) * 3 + 3];
static int try;
const struct iovec io = {
.iov_base = buf,
.iov_len = sprintf(buf, "%d.", ++try)
};
int rc;
if (!fail) {
rc = write(exp_fd, io.iov_base, io.iov_len);
if (rc != (int) io.iov_len)
perror_msg_and_fail("iter %d: write", iter);
}
errno = 0;
rc = writev(got_fd, &io, 1);
if (fail) {
if (!(rc == -1 && errno == err))
perror_msg_and_fail("iter %d: expected errno %d"
", got rc == %d, errno == %d",
iter, err, rc, errno);
if (is_raw)
tprintf("writev(%#x, %p, 0x1)"
" = -1 %s (%m) (INJECTED)\n",
got_fd, &io, errstr);
else
tprintf("writev(%d, [{iov_base=\"%s\", iov_len=%d}], 1)"
" = -1 %s (%m) (INJECTED)\n",
got_fd, buf, (int) io.iov_len, errstr);
} else {
if (rc != (int) io.iov_len)
perror_msg_and_fail("iter %d: expected %d"
", got rc == %d, errno == %d",
iter, (int) io.iov_len, rc, errno);
if (is_raw)
tprintf("writev(%#x, %p, 0x1) = %#x\n",
got_fd, &io, rc);
else
tprintf("writev(%d, [{iov_base=\"%s\", iov_len=%d}], 1)"
" = %d\n",
got_fd, buf, (int) io.iov_len,
(int) io.iov_len);
}
}
static int
open_file(const char *prefix, int proc)
{
static const int open_flags = O_WRONLY | O_TRUNC | O_CREAT;
static char path[PATH_MAX + 1];
snprintf(path, sizeof(path), "%s.%d", prefix, proc);
int fd = open(path, open_flags, 0600);
if (fd < 0)
perror_msg_and_fail("open: %s", path);
return fd;
}
int
main(int argc, char *argv[])
{
assert(argc == 12);
is_raw = !strcmp("raw", argv[1]);
errstr = argv[2];
err = atoi(errstr);
assert(err >= 0);
if (!err) {
if (!*errstr)
err = DEFAULT_ERRNO;
else if (!strcasecmp(errstr, "EINVAL"))
err = EINVAL;
else
err = ENOSYS;
}
errno = err;
errstr = errno2name();
int first = atoi(argv[3]);
int last = atoi(argv[4]);
int step = atoi(argv[5]);
int iter = atoi(argv[6]);
int num_procs = atoi(argv[7]);
char *exp_prefix = argv[8];
char *got_prefix = argv[9];
char *out_prefix = argv[10];
char *pid_prefix = argv[11];
assert(first > 0);
assert(step >= 0);
assert(num_procs > 0);
for (int proc = 0; proc < num_procs; ++proc) {
int ret = fork();
if (ret < 0)
perror_msg_and_fail("fork");
if (ret > 0) {
int pidfd = open_file(pid_prefix, proc);
char pidstr[sizeof(ret) * 3];
int len = snprintf(pidstr, sizeof(pidstr), "%d", ret);
assert(len > 0 && len < (int) sizeof(pidstr));
assert(write(pidfd, pidstr, len) == len);
close(pidfd);
continue;
}
tprintf("%s", "");
exp_fd = open_file(exp_prefix, proc);
got_fd = open_file(got_prefix, proc);
out_fd = open_file(out_prefix, proc);
/* This magic forces tprintf to write where we want it. */
dup2(out_fd, 3);
for (int i = 1; i <= iter; ++i) {
int fail = 0;
if (last != 0) {
--first;
if (last != -1)
--last;
if (first == 0) {
fail = 1;
first = step;
}
}
invoke(i, fail);
}
tprintf("%s\n", "+++ exited with 0 +++");
return 0;
}
for (int proc = 0; proc < num_procs; ++proc) {
int status;
int ret = wait(&status);
if (ret <= 0)
perror_msg_and_fail("wait %d", proc);
if (status)
error_msg_and_fail("wait: pid=%d status=%d",
ret, status);
}
return 0;
}
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