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 dev_t's and DEVFS registration for devices 36.Sh SYNOPSIS 37.Fd #include <sys/types.h> 38.Fd #include <sys/conf.h> 39.Ft dev_t 40.Fn make_dev "struct cdevsw *cdevsw" "int minor" "uid_t uid" "gid_t gid" "int perms" "char *fmt" ... 41.Ft dev_t 42.Fn make_dev_alias "dev_t pdev" "char *fmt" ... 43.Ft void 44.Fn destroy_dev "dev_t dev" 45.Ft void 46.Fn dev_depends "dev_t pdev" "dev_t cdev" 47.Sh DESCRIPTION 48The 49.Fn make_dev 50function creates a 51.Fa dev_t 52structure for a new device. If DEVFS is available, it is also notified of 53the presence of the new device. The device will be owned by 54.Va uid , 55with the group ownership as 56.Va gid , 57and with the name as specified in 58.Va name . 59The permissions of the file specified in 60.Va perms 61are defined in 62.Aq Pa sys/stat.h : 63.Pp 64.Bd -literal -offset indent -compact 65#define S_IRWXU 0000700 /* RWX mask for owner */ 66#define S_IRUSR 0000400 /* R for owner */ 67#define S_IWUSR 0000200 /* W for owner */ 68#define S_IXUSR 0000100 /* X for owner */ 69 70#define S_IRWXG 0000070 /* RWX mask for group */ 71#define S_IRGRP 0000040 /* R for group */ 72#define S_IWGRP 0000020 /* W for group */ 73#define S_IXGRP 0000010 /* X for group */ 74 75#define S_IRWXO 0000007 /* RWX mask for other */ 76#define S_IROTH 0000004 /* R for other */ 77#define S_IWOTH 0000002 /* W for other */ 78#define S_IXOTH 0000001 /* X for other */ 79 80#define S_ISUID 0004000 /* set user id on execution */ 81#define S_ISGID 0002000 /* set group id on execution */ 82#define S_ISVTX 0001000 /* sticky bit */ 83#ifndef _POSIX_SOURCE 84#define S_ISTXT 0001000 85#endif 86.Ed 87.Pp 88The 89.Fn make_dev_alias 90function takes the returned 91.Ft dev_t 92from 93.Fn make_dev 94and makes another (aliased) name for this device. 95It is an error to call 96.Fn make_dev_alias 97prior to calling 98.Fn make_dev . 99.Pp 100The 101.Fn destroy_dev 102function takes the returned 103.Fa dev_t 104from 105.Fn make_dev 106and destroys the registration for that device. 107Do not call 108.Fn destroy_dev 109on devices that were created with 110.Fn make_dev_alias . 111.Pp 112The 113.Fn depends_dev 114function establishes a parent-child relationship between two devices. 115The net effect is that a 116.Fn destroy_dev 117of the parent device will also result in the destruction of the 118child device(s), 119if any exist. 120A device may simultaneously be a parent and a child, 121so it is possible to build a complete hierachy. 122.Sh HISTORY 123The 124.Fn make_dev 125and 126.Fn destroy_dev 127functions first appeared in 128.Fx 4.0 . 129The function 130.Fn make_dev_alias 131first appeared in 132.Fx 4.1 . 133The function 134.Fn depends_dev 135first appeared in 136.Fx 5.0 . 137