#include "apue.h"
#include <sys/socket.h>
#include <sys/un.h>
#include <errno.h>

static void die(const char *m) { perror(m); exit(1); }

int main(int argc, char **argv)
{
    if (argc != 4) {
        fprintf(stderr, "usage: %s <domain-sock-name> <msg> <num-repeat>\n", argv[0]);
        exit(1);
    }

    const char *name = argv[1];
    const char *msg = argv[2];
    int num_repeat = atoi(argv[3]);

    struct sockaddr_un	un;

    if (strlen(name) >= sizeof(un.sun_path)) {
        errno = ENAMETOOLONG;
        die("name too long");
    }

    int fd, len, i;

    // create a UNIX domain datagram socket
    if ((fd = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0)
        die("socket failed");

    // fill in the socket address structure with server's address
    memset(&un, 0, sizeof(un));
    un.sun_family = AF_UNIX;
    strcpy(un.sun_path, name);
    len = offsetof(struct sockaddr_un, sun_path) + strlen(name);

    for (i = 0; i < num_repeat; i++) {
        int n = sendto(fd, msg, strlen(msg), 0, (struct sockaddr *)&un, len);
        if (n < 0) 
            die("send failed");
        else 
            printf("sent %d bytes\n", n);
    }

    close(fd);
    return 0;
}