blob: 6e8bf141cafa81ea340b12112395d3d163518421 (
plain)
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
|
// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#define fd (100)
// Tests libgo2.so, which does not export any functions.
// Read a string from the file descriptor and print it.
int main(void) {
int i;
ssize_t n;
char buf[20];
struct timespec ts;
// The descriptor will be initialized in a thread, so we have to
// give a chance to get opened.
for (i = 0; i < 1000; i++) {
n = read(fd, buf, sizeof buf);
if (n >= 0)
break;
if (errno != EBADF && errno != EINVAL) {
fprintf(stderr, "BUG: read: %s\n", strerror(errno));
return 2;
}
// An EBADF error means that the shared library has not opened the
// descriptor yet.
ts.tv_sec = 0;
ts.tv_nsec = 1000000;
nanosleep(&ts, NULL);
}
if (n < 0) {
fprintf(stderr, "BUG: failed to read any data from pipe\n");
return 2;
}
if (n == 0) {
fprintf(stderr, "BUG: unexpected EOF\n");
return 2;
}
if (n == sizeof buf) {
n--;
}
buf[n] = '\0';
printf("%s\n", buf);
return 0;
}
|
