1ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <sys/types.h>
2ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <sys/wait.h>
3ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <sys/socket.h>
4ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <netinet/in.h>
5ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <arpa/inet.h>
6ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <stdio.h>
7ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <fcntl.h>
8ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <unistd.h>
9ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <stdlib.h>
10ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <string.h>
11ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "fdleak.h"
12ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
13ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownvoid server ()
14ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{
15ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   int s, x;
16ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   struct sockaddr_in baddr;
17ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   struct sockaddr_in addr;
18ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   socklen_t baddrsize = sizeof(baddr);
19ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   int one = 1;
20ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
21ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   s = DO( socket(PF_INET, SOCK_STREAM, 0) );
22ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
23ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   DO( setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(int)) );
24ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   memset(&addr, 0, sizeof(addr));
25ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   addr.sin_family = AF_INET;
26ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   addr.sin_addr.s_addr = inet_addr("127.0.0.1");
27ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   addr.sin_port = htons(12321);
28ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
29ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   DO( bind(s, (struct sockaddr *)&addr, sizeof(addr)) );
30ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
31ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   DO( listen(s, 5) );
32ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
33ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   memset(&baddr, 0, sizeof(baddr));
34ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   x = DO( accept(s, (struct sockaddr *)&baddr, &baddrsize) );
35ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
36ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   DO( write(x, "hello", 6) );
37ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown}
38ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
39ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownvoid client ()
40ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{
41ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   int s, count = 0, ret;
42ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   struct sockaddr_in addr;
43ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   char buf[1024];
44ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
45ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   addr.sin_family = AF_INET;
46ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   addr.sin_addr.s_addr = inet_addr("127.0.0.1");
47ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   addr.sin_port = htons(12321);
48ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
49ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   do {
50ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown     count++;
51ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown     s = DO( socket(PF_INET, SOCK_STREAM, 0) );
52ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown     ret = connect(s, (struct sockaddr *)&addr, sizeof(addr));
53ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown     if (ret == -1) {
54ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown       // If the connect() failed, we close the socket and reopen it before
55ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown       // trying again.  This isn't necessary on Linux, but it is on Darwin.
56ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown       DO( close(s) );
57ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown       sleep(1);
58ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown     }
59ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   } while (count < 10 && ret == -1);
60ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
61ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   if (ret == -1) {
62ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown      perror("connect");
63ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown      exit(1);
64ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   }
65ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
66ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   DO( read(s, buf, sizeof(buf)) );
67ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
68ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   printf("%s\n", buf);
69ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown}
70ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
71ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
72ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownint main (int argc, char **argv)
73ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{
74ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   int pid, status;
75ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
76ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   CLOSE_INHERITED_FDS;
77ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
78ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   if ((pid = fork()) == 0) {
79ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown      server();
80ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown      return 0;
81ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   }
82ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
83ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   client();
84ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
85ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   wait(&status);
86ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
87ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown   return 0;
88ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown}
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