get a unix socket name by fd

getsocknames.c

#include <sys/un.h>
#include <sys/socket.h>

int get_sock_name(int fd, char *name, int name_len)
{
    int ret
    socklen_t len = sizeof(struct sockaddr_un);
    struct sockaddr_un s;
    
    ret = getsockname(fd, (struct sockaddr *)&s, &len);
    if (!ret) {
        if (s.sun_path[0])
            strncpy(name, s.sun_path, name_len)
    }
    
    return ret
}