CSY/reowolf Files · examples/interop_2_pseudo_socket/main.c

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Fix binding- and assignment-expression related typing issues.

Simpler solutions are better, so the typechecker is back to normal.
Instead we simply make sure that assignment expression is never
nested under another expression, and binding expressions may only
be nested under LogicalAnd-expressions. If only I knew why I thought
type shenanigans were a good idea in the first place...

/* This example demonstrates:
- Reowolf's pseudo-socket API mimics the API of UDP sockets
- This example corresponds closely with that of the socket API, differing only in:
    1. an added import of the pseudo-socket header file
    2. (pseudo-)socket operations' identifiers are prefixed with `rw_` (short for "Reowolf"). 
*/
#include <netinet/in.h> // definies socketaddr_in
#include <stdio.h>  // defines printf
#include <stdlib.h> // defines malloc, free
#include <unistd.h> // defines close
#include <arpa/inet.h> // defines inet_addr
#include "../../pseudo_socket.h"
#define BUFSIZE 512
int main() {
    // --- setup ---
    struct sockaddr_in addrs[2]; 
    addrs[0].sin_family = AF_INET;
    addrs[0].sin_port = htons(8000);
    inet_pton(AF_INET, "127.0.0.1", &addrs[0].sin_addr.s_addr);
    addrs[1].sin_family = AF_INET;
    addrs[1].sin_port = htons(8001);
    inet_pton(AF_INET, "127.0.0.1", &addrs[1].sin_addr.s_addr);
    int fd = rw_socket(AF_INET, SOCK_DGRAM, 0); 
    rw_bind(fd, (const struct sockaddr *)&addrs[0], sizeof(addrs[0]));
    rw_connect(fd, (const struct sockaddr *)&addrs[1], sizeof(addrs[1]));
    // --- communication ---
    char * buffer = malloc(BUFSIZE);
    size_t msglen, i;
    msglen = rw_recv(fd, (void *)buffer, BUFSIZE, 0);
    for(i=0; i<msglen; i++) {
        printf("%02X", buffer[i]);
    }
    // --- cleanup ---
    rw_close(fd);
    free(buffer);
    return 0;
}