freebsd-nq/share/man/man9/make_dev.9

.\" Copyright (c) 1999 Chris Costello
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.Dd September 25, 1999
.Os
.Dt MAKE_DEV 9
.Sh NAME
.Nm make_dev ,
.Nm destroy_dev
.Nd "create or destroy dev_t and devfs registration for a new device"
.Sh SYNOPSIS
.Fd #include <sys/types.h>
.Fd #include <sys/conf.h>
.Ft dev_t
.Fn make_dev "struct cdevsw *cdevsw" "int minor" "uid_t uid" "gid_t gid" "int perms" "char *fmt" ...
.Ft dev_t
.Fn make_dev_alias "dev_t pdev" "char *fmt" ...
.Ft void
.Fn destroy_dev "dev_t dev"
.Sh DESCRIPTION
The
.Fn make_dev
function creates a
.Fa dev_t
structure for a new device.  If DEVFS is available, it is also notified of
the presence of the new device.  The device will be owned by
.Va uid ,
with the group ownership as
.Va gid ,
and with the name as specified in
.Va name .
The permissions of the file specified in
.Va perms
are defined in
.Aq Pa sys/stat.h :
.Pp
.Bd -literal -offset indent -compact
#define S_IRWXU 0000700    /* RWX mask for owner */
#define S_IRUSR 0000400    /* R for owner */
#define S_IWUSR 0000200    /* W for owner */
#define S_IXUSR 0000100    /* X for owner */

#define S_IRWXG 0000070    /* RWX mask for group */
#define S_IRGRP 0000040    /* R for group */
#define S_IWGRP 0000020    /* W for group */
#define S_IXGRP 0000010    /* X for group */

#define S_IRWXO 0000007    /* RWX mask for other */
#define S_IROTH 0000004    /* R for other */
#define S_IWOTH 0000002    /* W for other */
#define S_IXOTH 0000001    /* X for other */

#define S_ISUID 0004000    /* set user id on execution */
#define S_ISGID 0002000    /* set group id on execution */
#define S_ISVTX 0001000    /* sticky bit */
#ifndef _POSIX_SOURCE
#define S_ISTXT 0001000
#endif
.Ed
.Pp
The
.Fn make_dev_alias
function takes the returned
.Ft dev_t
from
.Fn make_dev
and makes another (aliased) name for this device.
It is an error to call
.Fn make_dev_alias
prior to calling
.Fn make_dev .
.Pp
The
.Fn destroy_dev
function takes the returned
.Fa dev_t
from
.Fn make_dev
and destroys the registration for that device.
Do not call
.Fn destroy_dev
on devices that were created with
.Fn make_dev_alias .
.Sh HISTORY
The
.Fn make_dev
and
.Fn destroy_dev
functions first appeared in
.Fx 4.0 .
The function
.Fn make_dev_alias
first appeared in
.Fx 4.1 .