225 pid_t xpopen_both(char **argv, int *pipes)  in xpopen_both()  argument
231   if (pipes) for (pid = 0; pid < 2; pid++) {  in xpopen_both()
232     if (pipes[pid] != -1) continue;  in xpopen_both()
238     if (pipes) {  in xpopen_both()
243         pipes[1] = cestnepasun[3];  in xpopen_both()
247         pipes[0] = cestnepasun[0];  in xpopen_both()
251       if (!pipes[1]) pipes[1] = dup(pipes[1]);  in xpopen_both()
254       if (pipes[0]) {  in xpopen_both()
255         dup2(pipes[0], 0);  in xpopen_both()
256         close(pipes[0]);  in xpopen_both()
260       if (pipes[1] != 1) {  in xpopen_both()
261         dup2(pipes[1], 1);  in xpopen_both()
291   if (pipes) {  in xpopen_both()
293       pipes[0] = cestnepasun[1];  in xpopen_both()
297       pipes[1] = cestnepasun[2];  in xpopen_both()
315 int xpclose_both(pid_t pid, int *pipes)  in xpclose_both()  argument
317   if (pipes) {  in xpclose_both()
318     close(pipes[0]);  in xpclose_both()
319     close(pipes[1]);  in xpclose_both()
328   int pipes[2], pid;  in xpopen()  local
330   pipes[0] = isstdout ? 0 : -1;  in xpopen()
331   pipes[1] = isstdout ? -1 : 1;  in xpopen()
332   pid = xpopen_both(argv, pipes);  in xpopen()
333   *pipe = pid ? pipes[!!isstdout] : -1;  in xpopen()