108 struct comm_pipes {  struct
113 static int setup_comm_pipes(struct comm_pipes *comm_pipes)  in setup_comm_pipes()  argument
115 	if (pipe(comm_pipes->child_ready) < 0)  in setup_comm_pipes()
117 	if (pipe(comm_pipes->parent_ready) < 0) {  in setup_comm_pipes()
118 		close(comm_pipes->child_ready[0]);  in setup_comm_pipes()
119 		close(comm_pipes->child_ready[1]);  in setup_comm_pipes()
126 static void close_comm_pipes(struct comm_pipes *comm_pipes)  in close_comm_pipes()  argument
128 	close(comm_pipes->child_ready[0]);  in close_comm_pipes()
129 	close(comm_pipes->child_ready[1]);  in close_comm_pipes()
130 	close(comm_pipes->parent_ready[0]);  in close_comm_pipes()
131 	close(comm_pipes->parent_ready[1]);  in close_comm_pipes()
135 			   struct comm_pipes *comm_pipes)  in child_memcmp_fn()  argument
144 	write(comm_pipes->child_ready[1], "0", 1);  in child_memcmp_fn()
145 	while (read(comm_pipes->parent_ready[0], &buf, 1) != 1)  in child_memcmp_fn()
153 				    struct comm_pipes *comm_pipes)  in child_vmsplice_memcmp_fn()  argument
185 	write(comm_pipes->child_ready[1], "0", 1);  in child_vmsplice_memcmp_fn()
186 	while (read(comm_pipes->parent_ready[0], &buf, 1) != 1)  in child_vmsplice_memcmp_fn()
199 typedef int (*child_fn)(char *mem, size_t size, struct comm_pipes *comm_pipes);
204 	struct comm_pipes comm_pipes;  in do_test_cow_in_parent()  local
208 	ret = setup_comm_pipes(&comm_pipes);  in do_test_cow_in_parent()
219 		exit(fn(mem, size, &comm_pipes));  in do_test_cow_in_parent()
222 	while (read(comm_pipes.child_ready[0], &buf, 1) != 1)  in do_test_cow_in_parent()
234 			write(comm_pipes.parent_ready[1], "0", 1);  in do_test_cow_in_parent()
242 	write(comm_pipes.parent_ready[1], "0", 1);  in do_test_cow_in_parent()
263 	close_comm_pipes(&comm_pipes);  in do_test_cow_in_parent()
297 	struct comm_pipes comm_pipes;  in do_test_vmsplice_in_parent()  local
307 	ret = setup_comm_pipes(&comm_pipes);  in do_test_vmsplice_in_parent()
331 		write(comm_pipes.child_ready[1], "0", 1);  in do_test_vmsplice_in_parent()
332 		while (read(comm_pipes.parent_ready[0], &buf, 1) != 1)  in do_test_vmsplice_in_parent()
348 	while (read(comm_pipes.child_ready[0], &buf, 1) != 1)  in do_test_vmsplice_in_parent()
354 	write(comm_pipes.parent_ready[1], "0", 1);  in do_test_vmsplice_in_parent()
388 	close_comm_pipes(&comm_pipes);  in do_test_vmsplice_in_parent()
407 	struct comm_pipes comm_pipes;  in do_test_iouring()  local
417 	ret = setup_comm_pipes(&comm_pipes);  in do_test_iouring()
469 			write(comm_pipes.child_ready[1], "0", 1);  in do_test_iouring()
470 			while (read(comm_pipes.parent_ready[0], &buf, 1) != 1)  in do_test_iouring()
475 		while (read(comm_pipes.child_ready[0], &buf, 1) != 1)  in do_test_iouring()
541 		write(comm_pipes.parent_ready[1], "0", 1);  in do_test_iouring()
553 	close_comm_pipes(&comm_pipes);  in do_test_iouring()
579 	struct comm_pipes comm_pipes;  in do_test_ro_pin()  local
595 	ret = setup_comm_pipes(&comm_pipes);  in do_test_ro_pin()
615 			write(comm_pipes.child_ready[1], "0", 1);  in do_test_ro_pin()
616 			while (read(comm_pipes.parent_ready[0], &buf, 1) != 1)  in do_test_ro_pin()
622 		while (read(comm_pipes.child_ready[0], &buf, 1) != 1)  in do_test_ro_pin()
631 			write(comm_pipes.parent_ready[1], "0", 1);  in do_test_ro_pin()
691 		write(comm_pipes.parent_ready[1], "0", 1);  in do_test_ro_pin()
700 	close_comm_pipes(&comm_pipes);  in do_test_ro_pin()
1223 	struct comm_pipes comm_pipes;  in do_test_anon_thp_collapse()  local
1227 	ret = setup_comm_pipes(&comm_pipes);  in do_test_anon_thp_collapse()
1289 			exit(child_memcmp_fn(mem, size, &comm_pipes));  in do_test_anon_thp_collapse()
1292 			exit(child_memcmp_fn(mem, size / 2, &comm_pipes));  in do_test_anon_thp_collapse()
1296 					     &comm_pipes));  in do_test_anon_thp_collapse()
1303 	while (read(comm_pipes.child_ready[0], &buf, 1) != 1)  in do_test_anon_thp_collapse()
1318 			write(comm_pipes.parent_ready[1], "0", 1);  in do_test_anon_thp_collapse()
1329 			write(comm_pipes.parent_ready[1], "0", 1);  in do_test_anon_thp_collapse()
1340 	write(comm_pipes.parent_ready[1], "0", 1);  in do_test_anon_thp_collapse()
1350 	close_comm_pipes(&comm_pipes);  in do_test_anon_thp_collapse()