1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
|
/*
* This file is part of attach-f-p strace test.
*
* Copyright (c) 2016-2018 Dmitry V. Levin <ldv@strace.io>
* Copyright (c) 2016-2023 The strace developers.
* 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 "scno.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, rc;
while ((rc = read(pipes[no][0], &i, sizeof(i))) != (int) sizeof(i)) {
if (rc < 0 && errno == EINTR)
continue;
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];
if (write(1, "", 0) != 0)
perror_msg_and_fail("write");
for (unsigned int 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 */
for (;;) {
struct stat st;
if (fstat(1, &st))
perror_msg_and_fail("fstat");
if (st.st_size >= 103)
break;
}
for (unsigned int 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\")" RVAL_ENOENT
"%-5d +++ exited with 0 +++\n", pid, text_parent, pid);
return 0;
}
|
