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/*
* This file is part of attach-f-p strace test.
*
* Copyright (c) 2016-2018 Dmitry V. Levin <ldv@altlinux.org>
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include <assert.h>
#include <errno.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <asm/unistd.h>
#include <unistd.h>
#define N 3
typedef union {
void *ptr;
pid_t pid;
} retval_t;
static const char text_parent[] = "attach-f-p.test parent";
static const char *child[N] = {
"attach-f-p.test child 0",
"attach-f-p.test child 1",
"attach-f-p.test child 2"
};
typedef int pipefd[2];
static pipefd pipes[N];
static void *
thread(void *a)
{
unsigned int no = (long) a;
int i;
if (read(pipes[no][0], &i, sizeof(i)) != (int) sizeof(i))
perror_msg_and_fail("read[%u]", no);
assert(chdir(child[no]) == -1);
retval_t retval = { .pid = syscall(__NR_gettid) };
return retval.ptr;
}
int
main(void)
{
pthread_t t[N];
unsigned int i;
if (write(1, "", 0) != 0)
perror_msg_and_fail("write");
for (i = 0; i < N; ++i) {
if (pipe(pipes[i]))
perror_msg_and_fail("pipe");
errno = pthread_create(&t[i], NULL, thread, (void *) (long) i);
if (errno)
perror_msg_and_fail("pthread_create");
}
if (write(1, "\n", 1) != 1)
perror_msg_and_fail("write");
/* wait for the peer to write to stdout */
struct stat st;
for (;;) {
if (fstat(1, &st))
perror_msg_and_fail("fstat");
if (st.st_size >= 103)
break;
}
for (i = 0; i < N; ++i) {
/* sleep a bit to let the tracer catch up */
sleep(1);
if (write(pipes[i][1], &i, sizeof(i)) != (int) sizeof(i))
perror_msg_and_fail("write[%u]", i);
retval_t retval;
errno = pthread_join(t[i], &retval.ptr);
if (errno)
perror_msg_and_fail("pthread_join");
errno = ENOENT;
printf("%-5d chdir(\"%s\") = %s\n"
"%-5d +++ exited with 0 +++\n",
retval.pid, child[i], sprintrc(-1), retval.pid);
}
/* sleep a bit more to let the tracer catch up */
sleep(1);
pid_t pid = getpid();
assert(chdir(text_parent) == -1);
printf("%-5d chdir(\"%s\") = -1 ENOENT (%m)\n"
"%-5d +++ exited with 0 +++\n", pid, text_parent, pid);
return 0;
}
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