+ if (r < 0) return -1;
+
+ return 0;
+}
+
+int fishdescriptor_donate(const char *path, const int *fds) {
+ /* return convention: returns errno value */
+ /* within function: r is like syscall return, errno value is in errno */
+ int r;
+ int esave = errno;
+ int carrier=-1;
+
+ carrier = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (carrier < 0) { r=-1; goto out; }
+
+ struct sockaddr_un suna;
+ memset(&suna,0,sizeof(suna));
+ suna.sun_family = AF_UNIX;
+ if (strlen(path) >= sizeof(suna.sun_path)) { errno=E2BIG; r=-1; goto out; }
+ strcpy(suna.sun_path, path);
+
+ r = connect(carrier, (const struct sockaddr*)&suna, sizeof(suna));
+ if (r) goto out;
+
+ int nfds;
+ for (nfds=0; fds[nfds] > 0; nfds++);
+
+ r = fishdescriptor_sendmsg_fds(carrier, nfds, fds);
+ if (r) goto out;
+
+ r = 0;
+ out:
+ if (carrier >= 0) close(carrier);
+ r = !r ? 0 : !errno ? EIO : errno;
+ errno = esave;
+ return r;