1 /* Test of ioctl() function. 2 Copyright (C) 2011-2021 Free Software Foundation, Inc. 3 4 This program is free software: you can redistribute it and/or modify 5 it under the terms of the GNU General Public License as published by 6 the Free Software Foundation; either version 3 of the License, or 7 (at your option) any later version. 8 9 This program is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 GNU General Public License for more details. 13 14 You should have received a copy of the GNU General Public License 15 along with this program. If not, see <https://www.gnu.org/licenses/>. */ 16 17 #include <config.h> 18 19 /* Specification. */ 20 #include <sys/ioctl.h> 21 22 #include "signature.h" 23 SIGNATURE_CHECK (ioctl, int, (int, int, ...)); 24 25 #include <errno.h> 26 #include <unistd.h> 27 28 #include "macros.h" 29 30 int 31 main (void) /* */ 32 { 33 #ifdef FIONREAD 34 /* Test behaviour for invalid file descriptors. */ 35 { 36 int value; 37 errno = 0; 38 ASSERT (ioctl (-1, FIONREAD, &value) == -1); 39 ASSERT (errno == EBADF); 40 } 41 { 42 int value; 43 close (99); 44 errno = 0; 45 ASSERT (ioctl (99, FIONREAD, &value) == -1); 46 ASSERT (errno == EBADF); 47 } 48 #endif 49 50 return 0; 51 }