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
server()13 void 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
client()39 void 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
main(int argc,char ** argv)72 int 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