doc/07.ipctut/udgramsend.c

.\" Copyright (c) 1986 Regents of the University of California.
.\" All rights reserved.  The Berkeley software License Agreement
.\" specifies the terms and conditions for redistribution.
.\"
.\"     @(#)udgramsend.c        6.2 (Berkeley) 5/8/86
.\"
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stdio.h>

#define DATA "The sea is calm tonight, the tide is full . . ."

/*
 * Here I send a datagram to a receiver whose name I get from the command
 * line arguments.  The form of the command line is udgramsend pathname
 */

main(argc, argv)
        int argc;
        char *argv[];
{
        int sock;
        struct sockaddr_un name;

        /* Create socket on which to send. */
        sock = socket(AF_UNIX, SOCK_DGRAM, 0);
        if (sock < 0) {
                perror("opening datagram socket");
                exit(1);
        }
        /* Construct name of socket to send to. */
        name.sun_family = AF_UNIX;
        strcpy(name.sun_path, argv[1]);
        /* Send message. */
        if (sendto(sock, DATA, sizeof(DATA), 0,
            &name, sizeof(struct sockaddr_un)) < 0) {
                perror("sending datagram message");
        }
        close(sock);
}