1#include <sys/types.h>
2#include <sys/wait.h>
3#include <sys/socket.h>
4#include <netinet/in.h>
5#include <arpa/inet.h>
6#include <stdio.h>
7#include <fcntl.h>
8#include <unistd.h>
9#include <stdlib.h>
10#include <string.h>
11#include "fdleak.h"
12
13void server ()
14{
15   int s, x;
16   struct sockaddr_in baddr;
17   struct sockaddr_in addr;
18   socklen_t baddrsize = sizeof(baddr);
19   int one = 1;
20
21   s = DO( socket(PF_INET, SOCK_STREAM, 0) );
22
23   (void) DO( setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(int)) );
24   memset(&addr, 0, sizeof(addr));
25   addr.sin_family = AF_INET;
26   addr.sin_addr.s_addr = inet_addr("127.0.0.1");
27   addr.sin_port = htons(12321);
28
29   (void) DO( bind(s, (struct sockaddr *)&addr, sizeof(addr)) );
30
31   (void) DO( listen(s, 5) );
32
33   memset(&baddr, 0, sizeof(baddr));
34   x = DO( accept(s, (struct sockaddr *)&baddr, &baddrsize) );
35
36   (void) DO( write(x, "hello", 6) );
37}
38
39void client ()
40{
41   int s, count = 0, ret;
42   struct sockaddr_in addr;
43   char buf[1024];
44
45   addr.sin_family = AF_INET;
46   addr.sin_addr.s_addr = inet_addr("127.0.0.1");
47   addr.sin_port = htons(12321);
48
49   do {
50     count++;
51     s = DO( socket(PF_INET, SOCK_STREAM, 0) );
52     ret = connect(s, (struct sockaddr *)&addr, sizeof(addr));
53     if (ret == -1) {
54       // If the connect() failed, we close the socket and reopen it before
55       // trying again.  This isn't necessary on Linux, but it is on Darwin.
56       (void) DO( close(s) );
57       sleep(1);
58     }
59   } while (count < 10 && ret == -1);
60
61   if (ret == -1) {
62      perror("connect");
63      exit(1);
64   }
65
66   (void) DO( read(s, buf, sizeof(buf)) );
67
68   printf("%s\n", buf);
69}
70
71
72int main (int argc, char **argv)
73{
74   int pid, status;
75
76   CLOSE_INHERITED_FDS;
77
78   if ((pid = fork()) == 0) {
79      server();
80      return 0;
81   }
82
83   client();
84
85   wait(&status);
86
87   return 0;
88}
89