1// Copyright 2015 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5#include <errno.h>
6#include <stdio.h>
7#include <stdlib.h>
8#include <string.h>
9#include <time.h>
10#include <unistd.h>
11
12#define fd (30)
13
14// Tests libgo2.so, which does not export any functions.
15// Read a string from the file descriptor and print it.
16int main(void) {
17 int i;
18 ssize_t n;
19 char buf[20];
20 struct timespec ts;
21
22 // The descriptor will be initialized in a thread, so we have to
23 // give a chance to get opened.
24 for (i = 0; i < 200; i++) {
25 n = read(fd, buf, sizeof buf);
26 if (n >= 0)
27 break;
28 if (errno != EBADF && errno != EINVAL) {
29 fprintf(stderr, "BUG: read: %s\n", strerror(errno));
30 return 2;
31 }
32
33 // An EBADF error means that the shared library has not opened the
34 // descriptor yet.
35 ts.tv_sec = 0;
36 ts.tv_nsec = 10000000;
37 nanosleep(&ts, NULL);
38 }
39
40 if (n < 0) {
41 fprintf(stderr, "BUG: failed to read any data from pipe\n");
42 return 2;
43 }
44
45 if (n == 0) {
46 fprintf(stderr, "BUG: unexpected EOF\n");
47 return 2;
48 }
49
50 if (n == sizeof buf) {
51 n--;
52 }
53 buf[n] = '\0';
54 printf("%s\n", buf);
55 return 0;
56}
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