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 (100) 13 14 // Tests libgo2.so, which does not export any functions. 15 // Read a string from the file descriptor and print it. 16 int 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 < 1000; 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 = 1000000; 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 } 57
