1 /*
2 * This file is part of attach-f-p strace test.
3 *
4 * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #include "tests.h"
31 #include <assert.h>
32 #include <errno.h>
33 #include <pthread.h>
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <sys/stat.h>
37 #include <asm/unistd.h>
38 #include <unistd.h>
39
40 #define N 3
41
42 typedef union {
43 void *ptr;
44 pid_t pid;
45 } retval_t;
46
47 static const char text_parent[] = "attach-f-p.test parent";
48 static const char *child[N] = {
49 "attach-f-p.test child 0",
50 "attach-f-p.test child 1",
51 "attach-f-p.test child 2"
52 };
53 typedef int pipefd[2];
54 static pipefd pipes[N];
55
56 static void *
thread(void * a)57 thread(void *a)
58 {
59 unsigned int no = (long) a;
60 int i;
61
62 if (read(pipes[no][0], &i, sizeof(i)) != (int) sizeof(i))
63 perror_msg_and_fail("read[%u]", no);
64 assert(chdir(child[no]) == -1);
65 retval_t retval = { .pid = syscall(__NR_gettid) };
66 return retval.ptr;
67 }
68
69 int
main(void)70 main(void)
71 {
72 pthread_t t[N];
73 unsigned int i;
74
75 if (write(1, "", 0) != 0)
76 perror_msg_and_fail("write");
77
78 for (i = 0; i < N; ++i) {
79 if (pipe(pipes[i]))
80 perror_msg_and_fail("pipe");
81
82 errno = pthread_create(&t[i], NULL, thread, (void *) (long) i);
83 if (errno)
84 perror_msg_and_fail("pthread_create");
85 }
86
87 if (write(1, "\n", 1) != 1)
88 perror_msg_and_fail("write");
89
90 /* wait for the peer to write to stdout */
91 struct stat st;
92 for (;;) {
93 if (fstat(1, &st))
94 perror_msg_and_fail("fstat");
95 if (st.st_size >= 103)
96 break;
97 }
98
99 for (i = 0; i < N; ++i) {
100 /* sleep a bit to let the tracer catch up */
101 sleep(1);
102 if (write(pipes[i][1], &i, sizeof(i)) != (int) sizeof(i))
103 perror_msg_and_fail("write[%u]", i);
104 retval_t retval;
105 errno = pthread_join(t[i], &retval.ptr);
106 if (errno)
107 perror_msg_and_fail("pthread_join");
108 errno = ENOENT;
109 printf("%-5d chdir(\"%s\") = %s\n"
110 "%-5d +++ exited with 0 +++\n",
111 retval.pid, child[i], sprintrc(-1), retval.pid);
112 }
113
114 /* sleep a bit more to let the tracer catch up */
115 sleep(1);
116
117 pid_t pid = getpid();
118 assert(chdir(text_parent) == -1);
119
120 printf("%-5d chdir(\"%s\") = -1 ENOENT (%m)\n"
121 "%-5d +++ exited with 0 +++\n", pid, text_parent, pid);
122
123 return 0;
124 }
125