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cdevmod.c (48212) cdevmod.c (48275)
1/* 08 Nov 1998*/
2/*
3 * cdevmod.c - a sample kld module implementing a character device driver.
4 *
5 * 08 Nov 1998 Rajesh Vaidheeswarran
6 *
7 * Copyright (c) 1998 Rajesh Vaidheeswarran
8 * All rights reserved.

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64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
65 * SUCH DAMAGE.
66 *
67 */
68#include <sys/param.h>
69#include <sys/systm.h>
70#include <sys/kernel.h>
71#include <sys/module.h>
1/* 08 Nov 1998*/
2/*
3 * cdevmod.c - a sample kld module implementing a character device driver.
4 *
5 * 08 Nov 1998 Rajesh Vaidheeswarran
6 *
7 * Copyright (c) 1998 Rajesh Vaidheeswarran
8 * All rights reserved.

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64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
65 * SUCH DAMAGE.
66 *
67 */
68#include <sys/param.h>
69#include <sys/systm.h>
70#include <sys/kernel.h>
71#include <sys/module.h>
72#include <sys/conf.h>
72
73#include "cdev.h"
74
73
74#include "cdev.h"
75
75static int cdev_load(module_t, modeventtype_t, void *);
76#define CDEV_MAJOR 32
76
77
78static struct cdevsw my_devsw = {
79 /* open */ mydev_open,
80 /* close */ mydev_close,
81 /* read */ noread,
82 /* write */ nowrite,
83 /* ioctl */ mydev_ioctl,
84 /* stop */ nostop,
85 /* reset */ noreset,
86 /* devtotty */ nodevtotty,
87 /* poll */ nopoll,
88 /* mmap */ nommap,
89 /* strategy */ nostrategy,
90 /* name */ "cdev",
91 /* parms */ noparms,
92 /* maj */ CDEV_MAJOR,
93 /* dump */ nodump,
94 /* psize */ nopsize,
95 /* flags */ D_TTY,
96 /* maxio */ 0,
97 /* bmaj */ -1
98};
99
77/*
78 * This function is called each time the module is loaded or unloaded.
79 * Since we are a miscellaneous module, we have to provide whatever
80 * code is necessary to patch ourselves into the area we are being
81 * loaded to change.
82 *
83 * The stat information is basically common to all modules, so there
84 * is no real issue involved with stat; we will leave it lkm_nullcmd(),
85 * since we don't have to do anything about it.
86 */
87
88static int
100/*
101 * This function is called each time the module is loaded or unloaded.
102 * Since we are a miscellaneous module, we have to provide whatever
103 * code is necessary to patch ourselves into the area we are being
104 * loaded to change.
105 *
106 * The stat information is basically common to all modules, so there
107 * is no real issue involved with stat; we will leave it lkm_nullcmd(),
108 * since we don't have to do anything about it.
109 */
110
111static int
89cdev_load(mod, cmd, arg)
90 module_t mod;
91 modeventtype_t cmd;
92 void * arg;
112cdev_load(module_t mod, int cmd, void *arg)
93{
94 int err = 0;
95
96 switch (cmd) {
97 case MOD_LOAD:
98
99 /* Do any initialization that you should do with the kernel */
100

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114 break;
115 }
116
117 return(err);
118}
119
120/* Now declare the module to the system */
121
113{
114 int err = 0;
115
116 switch (cmd) {
117 case MOD_LOAD:
118
119 /* Do any initialization that you should do with the kernel */
120

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134 break;
135 }
136
137 return(err);
138}
139
140/* Now declare the module to the system */
141
122DEV_MODULE(cdev_mod, CDEV_MAJOR, -1, my_devsw, cdev_load, 0);
142DEV_MODULE(cdev, CDEV_MAJOR, -1, my_devsw, cdev_load, 0);