35 	int status, ret;  in parent_f()  local
37 	ret = read(sock, &status, sizeof(int));  in parent_f()
38 	BUG_ON(ret <= 0, "read(sock)");  in parent_f()
41 	ret = msync(smap, MMAP_SZ, MS_SYNC);  in parent_f()
42 	BUG_ON(ret, "msync()");  in parent_f()
44 	ret = write(sock, &status, sizeof(int));  in parent_f()
45 	BUG_ON(ret <= 0, "write(sock)");  in parent_f()
55 	int ret, buf = 0;  in child_f()  local
63 	ret = write(sock, &buf, sizeof(int));  in child_f()
64 	BUG_ON(ret <= 0, "write(sock)");  in child_f()
66 	ret = read(sock, &buf, sizeof(int));  in child_f()
67 	BUG_ON(ret <= 0, "read(sock)");  in child_f()
77 	int sock[2], child, ret;  in main()  local
84 	ret = ftruncate(fileno(ftmp), MMAP_SZ);  in main()
85 	BUG_ON(ret, "ftruncate()");  in main()
93 	ret = msync(smap, MMAP_SZ, MS_SYNC);  in main()
94 	BUG_ON(ret, "msync()");  in main()
96 	ret = socketpair(PF_LOCAL, SOCK_SEQPACKET, 0, sock);  in main()
97 	BUG_ON(ret, "socketpair()");  in main()
103 		ret = close(sock[0]);  in main()
104 		BUG_ON(ret, "close()");  in main()
109 	ret = close(sock[1]);  in main()
110 	BUG_ON(ret, "close()");  in main()