tests/tests_unix_fna/test_unix_send_receive.c

   1 #include <stdio.h>
   2 #include <stdlib.h> /* atoi */
   3 #include <unistd.h> /* sleep */
   4 #include <assert.h>
   5 #include <string.h> /* memset */
   6
   7 #include <sys/socket.h>
   8 #include <sys/un.h> /* struct sockaddr_un */
   9
  10 #define SENDER_PATH     "/tmp/sender_addr"
  11 #define RECEIVER_PATH   "/tmp/receiver_addr"
  12
  13 void sender(void);
  14 void receiver(void);
  15
  16 int main (int argc, char **argv)
  17 {
  18         if (argc != 2) {
  19                 printf("please provide the node to execute:\n");
  20                 printf("  $./mprogram 0 (sender)\n");
  21                 printf("  $./mprogram 1 (receiver)\n");
  22                 return -1;
  23         }
  24
  25         switch(atoi(argv[1])) {
  26         case 0:
  27                 sender();
  28                 break;
  29         case 1:
  30                 receiver();
  31                 break;
  32         default:
  33                 printf("wrong node number\n");
  34                 return -1;
  35         }
  36
  37         unlink(SENDER_PATH);
  38         unlink(RECEIVER_PATH);
  39
  40         return 0;
  41 }
  42
  43 void sender(void)
  44 {
  45         int sock, err, i;
  46         struct sockaddr_un sender_addr, receiver_addr;
  47         char buffer[100];
  48         size_t size;
  49         ssize_t sent_bytes;
  50
  51         printf("I am the sender\n");
  52
  53         sock = socket(AF_UNIX, SOCK_DGRAM, 0);
  54         assert(sock >= 0);
  55
  56         memset(&sender_addr, 0, sizeof(sender_addr));
  57         sender_addr.sun_family = AF_UNIX;
  58         strcpy(sender_addr.sun_path, SENDER_PATH);
  59
  60         err = bind(sock, (struct sockaddr *)&sender_addr, sizeof(sender_addr));
  61         assert(err >= 0);
  62
  63         memset(&receiver_addr, 0, sizeof(receiver_addr));
  64         receiver_addr.sun_family = AF_UNIX;
  65         strcpy(receiver_addr.sun_path, RECEIVER_PATH);
  66
  67         for(i=0; i<10; i++) {
  68                 sleep(1);
  69                 size = snprintf(buffer, sizeof(buffer), "hello world %d", i);
  70                 sent_bytes = sendto(sock,
  71                                     buffer,
  72                                     size,
  73                                     0,
  74                                     (struct sockaddr *) &receiver_addr,
  75                                     sizeof(receiver_addr));
  76
  77                 assert(sent_bytes >= 0);
  78
  79                 printf("sender : sent %s\n", buffer);
  80         }
  81
  82         close(sock);
  83         printf("Sender done\n");
  84 }
  85
  86 void receiver(void)
  87 {
  88         int sock, err, i;
  89         struct sockaddr_un sender_addr, receiver_addr;
  90         char buffer[100];
  91         ssize_t received_bytes;
  92         socklen_t from_len;
  93
  94         printf("I am the receiver\n");
  95
  96         sock = socket(AF_UNIX, SOCK_DGRAM, 0);
  97         assert(sock >= 0);
  98
  99         memset(&receiver_addr, 0, sizeof(receiver_addr));
 100         receiver_addr.sun_family = AF_UNIX;
 101         strcpy(receiver_addr.sun_path, RECEIVER_PATH);
 102
 103         err = bind(sock, (struct sockaddr *)&receiver_addr, sizeof(receiver_addr));
 104         assert(err >= 0);
 105
 106         for(i=0; i<10; i++) {
 107                 from_len = sizeof(sender_addr);
 108                 received_bytes = recvfrom(sock,
 109                                           buffer,
 110                                           sizeof(buffer),
 111                                           0,
 112                                           (struct sockaddr *)&sender_addr,
 113                                           &from_len);
 114
 115                 assert(received_bytes >= 0);
 116
 117                 buffer[received_bytes] = '\0';
 118                 printf("receiver : received %s\n", buffer);
 119         }
 120
 121         close(sock);
 122         printf("receiver done\n");
 123 }