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#include #include #include #include #include #include #include #include #include union fdmsg { struct cmsghdr h; char buf[CMSG_SPACE(sizeof(int))]; }; int main(int argc, char** argv) { int lsock = socket(PF_UNIX, SOCK_STREAM, 0); if(lsock == -1) { printf("socket\n"); exit(1); } struct sockaddr_un addr; memset(&addr, 0, sizeof(struct sockaddr_un)); addr.sun_family = AF_UNIX; strcpy(addr.sun_path, "/home/chris/mysock"); int ret = connect(lsock, (struct sockaddr*)&addr, sizeof(addr.sun_family) + strlen(addr.sun_path)); if(ret == -1) { printf("connect\n"); exit(1); } struct iovec iov; struct msghdr msg; char data; union fdmsg cmsg; struct cmsghdr* h; msg.msg_control = cmsg.buf; msg.msg_controllen = sizeof(union fdmsg); msg.msg_name = 0; msg.msg_namelen = 0; msg.msg_iov = &iov; msg.msg_iovlen = 1; msg.msg_flags = 0; iov.iov_base = &data; iov.iov_len = 1; h = CMSG_FIRSTHDR(&msg); h->cmsg_len = CMSG_LEN(sizeof(int)); h->cmsg_level = SOL_SOCKET; h->cmsg_type = SCM_RIGHTS; *((int*)CMSG_DATA(h)) = -1; ret = recvmsg(lsock, &msg, 0); if(ret <= 0) { printf("recvmsg\n"); exit(1); } h = CMSG_FIRSTHDR(&msg); // The website illustrating this process suggested the kernel might realloc // our buffer, though this seems illogical. int readfd = *((int*)CMSG_DATA(h)); printf("Successfully received file descriptor\n"); char* shm = mmap(0, 10, PROT_READ | PROT_WRITE, MAP_SHARED, readfd, 0); if(shm == (char*)-1) { printf("mmap\n"); exit(1); } printf("Got shared memory at %p\n", shm); while(1) { printf("SHM currently says: %s\nPress any key to re-read\n", shm); getchar(); } return 0; }