server.c

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/un.h>
#include <unistd.h>

int main(){
    char buf[256];
    int bytes;
    socklen_t socksize = sizeof(struct sockaddr_un);
    int sfd = socket(AF_UNIX, SOCK_DGRAM, 0);
    struct sockaddr_un saddr, faddr;
    memset(&saddr, 0, sizeof(struct sockaddr_un));
    saddr.sun_family = AF_UNIX;
    saddr.sun_path[0] = '\0';
    strcpy(&saddr.sun_path[1], "test.sock");
    bind(sfd, (struct sockaddr*)&saddr, sizeof(saddr));
    while(1){
        bytes = recvfrom(sfd, buf, 256, 0, (struct sockaddr*)&faddr, &socksize);
        if(bytes > 1){
            printf("[%s]", &faddr.sun_path[1]);
            printf("%s\n", buf);
            if(strncmp("end", buf, 4) == 0){
                break;
            }
        }
    }
    close(sfd);
    return 0;
}