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1
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2
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#include <stdint.h>
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3
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#include <stdlib.h>
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4
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#include <unistd.h>
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5
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#include <string.h>
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6
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#include <stdio.h>
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7
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#include <fcntl.h>
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8
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9
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#include <sys/types.h>
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10
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#include <sys/socket.h>
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11
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12
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static int set_int_opt(int fd, int opt, int val)
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13
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{
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14
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return setsockopt(fd, SOL_SOCKET, opt, &val, sizeof(val));
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15
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}
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16
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17
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static int get_int_opt(int fd, int opt)
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18
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{
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19
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int ret, rc;
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20
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socklen_t optlen = sizeof(ret);
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21
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22
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rc = getsockopt(fd, SOL_SOCKET, opt, &ret, &optlen);
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23
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if (rc < 0)
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24
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return rc;
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25
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return ret;
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26
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}
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27
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28
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static int set_nonblock(int fd)
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29
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{
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30
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int flags;
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31
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flags = fcntl(fd, F_GETFL);
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32
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if (flags < 0)
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33
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return flags;
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34
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flags |= O_NONBLOCK;
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35
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36
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return fcntl(fd, F_SETFL, flags);
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37
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}
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38
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39
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static int run_test_socketpair(int tx_buf)
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40
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{
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41
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int rc, sd[2];
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42
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uint8_t buf[1024*1024];
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43
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44
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memset(buf, 0, sizeof(buf));
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45
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46
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rc = socketpair(AF_UNIX, SOCK_STREAM, 0, sd);
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47
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if (rc < 0)
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48
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return rc;
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49
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50
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/* set the lowest possible transmit socket buffer */
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51
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set_int_opt(sd[0], SO_SNDBUF, tx_buf);
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52
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set_nonblock(sd[0]);
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53
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54
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rc = write(sd[0], buf, sizeof(buf));
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55
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printf("socketpair: tx_buf %7d: written %7d of %ld\n", tx_buf, rc, sizeof(buf));
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56
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57
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close(sd[0]);
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58
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close(sd[1]);
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59
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return 0;
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60
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}
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61
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62
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static int run_test_pipe(int tx_buf)
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63
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{
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64
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int rc, sd[2];
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65
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uint8_t buf[1024*1024];
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66
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67
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memset(buf, 0, sizeof(buf));
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68
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69
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rc = pipe(sd);
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70
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if (rc < 0)
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71
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return rc;
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72
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73
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set_nonblock(sd[1]);
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74
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75
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rc = write(sd[1], buf, sizeof(buf));
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76
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printf("pipe: tx_buf %7d: written %7d of %ld\n", tx_buf, rc, sizeof(buf));
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77
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78
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close(sd[0]);
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79
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close(sd[1]);
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80
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return 0;
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81
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}
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82
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83
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84
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85
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86
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int main(int argc, char **argv)
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87
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{
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88
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int i;
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89
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90
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for (i = 0; i < 20; i++) {
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91
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run_test_socketpair(1<<i);
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92
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}
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93
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run_test_pipe(0);
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94
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}
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