1 /* 2 * Copyright (c) 1982, 1986, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)subr_xxx.c 8.2 (Berkeley) 02/14/95 8 */ 9 10 /* 11 * Miscellaneous trivial functions, including many 12 * that are often inline-expanded or done in assembler. 13 */ 14 #include <sys/param.h> 15 #include <sys/systm.h> 16 17 #include <machine/cpu.h> 18 19 /* 20 * Unsupported device function (e.g. writing to read-only device). 21 */ 22 int 23 enodev() 24 { 25 26 return (ENODEV); 27 } 28 29 /* 30 * Unconfigured device function; driver not configured. 31 */ 32 int 33 enxio() 34 { 35 36 return (ENXIO); 37 } 38 39 /* 40 * Unsupported ioctl function. 41 */ 42 int 43 enoioctl() 44 { 45 46 return (ENOTTY); 47 } 48 49 /* 50 * Unsupported system function. 51 * This is used for an otherwise-reasonable operation 52 * that is not supported by the current system binary. 53 */ 54 int 55 enosys() 56 { 57 58 return (ENOSYS); 59 } 60 61 /* 62 * Return error for operation not supported 63 * on a specific object or file type. 64 */ 65 int 66 eopnotsupp() 67 { 68 69 return (EOPNOTSUPP); 70 } 71 72 /* 73 * Generic null operation, always returns success. 74 */ 75 int 76 nullop() 77 { 78 79 return (0); 80 } 81