1.\" Copyright (c) 1999 Chris Costello 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD$ 26.\" 27.Dd May 27, 2001 28.Os 29.Dt MAKE_DEV 9 30.Sh NAME 31.Nm make_dev , 32.Nm make_dev_alias , 33.Nm destroy_dev , 34.Nm depends_dev 35.Nd manage 36.Vt dev_t Ns 's 37and DEVFS registration for devices 38.Sh SYNOPSIS 39.Fd #include <sys/types.h> 40.Fd #include <sys/conf.h> 41.Ft dev_t 42.Fn make_dev "struct cdevsw *cdevsw" "int minor" "uid_t uid" "gid_t gid" "int perms" "char *fmt" ... 43.Ft dev_t 44.Fn make_dev_alias "dev_t pdev" "char *fmt" ... 45.Ft void 46.Fn destroy_dev "dev_t dev" 47.Ft void 48.Fn dev_depends "dev_t pdev" "dev_t cdev" 49.Sh DESCRIPTION 50The 51.Fn make_dev 52function creates a 53.Fa dev_t 54structure for a new device. If DEVFS is available, it is also notified of 55the presence of the new device. The device will be owned by 56.Va uid , 57with the group ownership as 58.Va gid , 59and with the name as specified in 60.Va name . 61The permissions of the file specified in 62.Va perms 63are defined in 64.Aq Pa sys/stat.h : 65.Pp 66.Bd -literal -offset indent -compact 67#define S_IRWXU 0000700 /* RWX mask for owner */ 68#define S_IRUSR 0000400 /* R for owner */ 69#define S_IWUSR 0000200 /* W for owner */ 70#define S_IXUSR 0000100 /* X for owner */ 71 72#define S_IRWXG 0000070 /* RWX mask for group */ 73#define S_IRGRP 0000040 /* R for group */ 74#define S_IWGRP 0000020 /* W for group */ 75#define S_IXGRP 0000010 /* X for group */ 76 77#define S_IRWXO 0000007 /* RWX mask for other */ 78#define S_IROTH 0000004 /* R for other */ 79#define S_IWOTH 0000002 /* W for other */ 80#define S_IXOTH 0000001 /* X for other */ 81 82#define S_ISUID 0004000 /* set user id on execution */ 83#define S_ISGID 0002000 /* set group id on execution */ 84#define S_ISVTX 0001000 /* sticky bit */ 85#ifndef _POSIX_SOURCE 86#define S_ISTXT 0001000 87#endif 88.Ed 89.Pp 90The 91.Fn make_dev_alias 92function takes the returned 93.Ft dev_t 94from 95.Fn make_dev 96and makes another (aliased) name for this device. 97It is an error to call 98.Fn make_dev_alias 99prior to calling 100.Fn make_dev . 101.Pp 102The 103.Fn destroy_dev 104function takes the returned 105.Fa dev_t 106from 107.Fn make_dev 108and destroys the registration for that device. 109Do not call 110.Fn destroy_dev 111on devices that were created with 112.Fn make_dev_alias . 113.Pp 114The 115.Fn depends_dev 116function establishes a parent-child relationship between two devices. 117The net effect is that a 118.Fn destroy_dev 119of the parent device will also result in the destruction of the 120child device(s), 121if any exist. 122A device may simultaneously be a parent and a child, 123so it is possible to build a complete hierachy. 124.Sh HISTORY 125The 126.Fn make_dev 127and 128.Fn destroy_dev 129functions first appeared in 130.Fx 4.0 . 131The function 132.Fn make_dev_alias 133first appeared in 134.Fx 4.1 . 135The function 136.Fn depends_dev 137first appeared in 138.Fx 5.0 . 139