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 dev_depends 35.Nd manage 36.Vt dev_t Ns 's 37and DEVFS registration for devices 38.Sh SYNOPSIS 39.In sys/param.h 40.In sys/conf.h 41.Ft dev_t 42.Fn make_dev "struct cdevsw *cdevsw" "int minor" "uid_t uid" "gid_t gid" "int perms" "const char *fmt" ... 43.Ft dev_t 44.Fn make_dev_alias "dev_t pdev" "const 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. 55If DEVFS is available, it is also notified of 56the presence of the new device. 57The device will be owned by 58.Va uid , 59with the group ownership as 60.Va gid , 61and with the name as specified in 62.Va name . 63The permissions of the file specified in 64.Va perms 65are defined in 66.In sys/stat.h : 67.Pp 68.Bd -literal -offset indent -compact 69#define S_IRWXU 0000700 /* RWX mask for owner */ 70#define S_IRUSR 0000400 /* R for owner */ 71#define S_IWUSR 0000200 /* W for owner */ 72#define S_IXUSR 0000100 /* X for owner */ 73 74#define S_IRWXG 0000070 /* RWX mask for group */ 75#define S_IRGRP 0000040 /* R for group */ 76#define S_IWGRP 0000020 /* W for group */ 77#define S_IXGRP 0000010 /* X for group */ 78 79#define S_IRWXO 0000007 /* RWX mask for other */ 80#define S_IROTH 0000004 /* R for other */ 81#define S_IWOTH 0000002 /* W for other */ 82#define S_IXOTH 0000001 /* X for other */ 83 84#define S_ISUID 0004000 /* set user id on execution */ 85#define S_ISGID 0002000 /* set group id on execution */ 86#define S_ISVTX 0001000 /* sticky bit */ 87#ifndef _POSIX_SOURCE 88#define S_ISTXT 0001000 89#endif 90.Ed 91.Pp 92The 93.Fn make_dev_alias 94function takes the returned 95.Ft dev_t 96from 97.Fn make_dev 98and makes another (aliased) name for this device. 99It is an error to call 100.Fn make_dev_alias 101prior to calling 102.Fn make_dev . 103.Pp 104The 105.Fn destroy_dev 106function takes the returned 107.Fa dev_t 108from 109.Fn make_dev 110and destroys the registration for that device. 111Do not call 112.Fn destroy_dev 113on devices that were created with 114.Fn make_dev_alias . 115.Pp 116The 117.Fn dev_depends 118function establishes a parent-child relationship between two devices. 119The net effect is that a 120.Fn destroy_dev 121of the parent device will also result in the destruction of the 122child device(s), 123if any exist. 124A device may simultaneously be a parent and a child, 125so it is possible to build a complete hierarchy. 126.Sh SEE ALSO 127.Xr devfs 5 128.Sh HISTORY 129The 130.Fn make_dev 131and 132.Fn destroy_dev 133functions first appeared in 134.Fx 4.0 . 135The function 136.Fn make_dev_alias 137first appeared in 138.Fx 4.1 . 139The function 140.Fn dev_depends 141first appeared in 142.Fx 5.0 . 143