sys/cddl/dev/prototype.c

   1 /*
   2  * This file is freeware. You are free to use it and add your own
   3  * license.
   4  *
   5  * $FreeBSD$
   6  *
   7  */
   8
   9 #include <sys/cdefs.h>
  10 #include <sys/param.h>
  11 #include <sys/systm.h>
  12 #include <sys/conf.h>
  13 #include <sys/kernel.h>
  14 #include <sys/module.h>
  15
  16 #include <sys/dtrace.h>
  17
  18 static d_open_t prototype_open;
  19 static int      prototype_unload(void);
  20 static void     prototype_getargdesc(void *, dtrace_id_t, void *, dtrace_argdesc_t *);
  21 static void     prototype_provide(void *, dtrace_probedesc_t *);
  22 static void     prototype_destroy(void *, dtrace_id_t, void *);
  23 static void     prototype_enable(void *, dtrace_id_t, void *);
  24 static void     prototype_disable(void *, dtrace_id_t, void *);
  25 static void     prototype_load(void *);
  26
  27 static struct cdevsw prototype_cdevsw = {
  28         .d_version      = D_VERSION,
  29         .d_open         = prototype_open,
  30         .d_name         = "prototype",
  31 };
  32
  33 static dtrace_pattr_t prototype_attr = {
  34 { DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
  35 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
  36 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_ISA },
  37 { DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
  38 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_ISA },
  39 };
  40
  41 static dtrace_pops_t prototype_pops = {
  42         .dtps_provide =         prototype_provide,
  43         .dtps_provide_module =  NULL,
  44         .dtps_enable =          prototype_enable,
  45         .dtps_disable =         prototype_disable,
  46         .dtps_suspend =         NULL,
  47         .dtps_resume =          NULL,
  48         .dtps_getargdesc =      prototype_getargdesc,
  49         .dtps_getargval =       NULL,
  50         .dtps_usermode =        NULL,
  51         .dtps_destroy =         prototype_destroy
  52 };
  53
  54 static struct cdev              *prototype_cdev;
  55 static dtrace_provider_id_t     prototype_id;
  56
  57 static void
  58 prototype_getargdesc(void *arg, dtrace_id_t id, void *parg, dtrace_argdesc_t *desc)
  59 {
  60 }
  61
  62 static void
  63 prototype_provide(void *arg, dtrace_probedesc_t *desc)
  64 {
  65 }
  66
  67 static void
  68 prototype_destroy(void *arg, dtrace_id_t id, void *parg)
  69 {
  70 }
  71
  72 static void
  73 prototype_enable(void *arg, dtrace_id_t id, void *parg)
  74 {
  75 }
  76
  77 static void
  78 prototype_disable(void *arg, dtrace_id_t id, void *parg)
  79 {
  80 }
  81
  82 static void
  83 prototype_load(void *dummy)
  84 {
  85         /*
  86          * Create the /dev/dtrace/prototype entry.
  87          * XXX: Remove this if the provider does not need any customs ioctls.
  88          */
  89         prototype_cdev = make_dev(&prototype_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600,
  90             "dtrace/prototype");
  91
  92         if (dtrace_register("prototype", &prototype_attr, DTRACE_PRIV_USER,
  93             NULL, &prototype_pops, NULL, &prototype_id) != 0)
  94                 return;
  95 }
  96
  97
  98 static int
  99 prototype_unload(void)
 100 {
 101         int error = 0;
 102
 103         if ((error = dtrace_unregister(prototype_id)) != 0)
 104                 return (error);
 105
 106         destroy_dev(prototype_cdev);
 107
 108         return (error);
 109 }
 110
 111 static int
 112 prototype_modevent(module_t mod __unused, int type, void *data __unused)
 113 {
 114         int error = 0;
 115
 116         switch (type) {
 117         case MOD_LOAD:
 118                 break;
 119
 120         case MOD_UNLOAD:
 121                 break;
 122
 123         case MOD_SHUTDOWN:
 124                 break;
 125
 126         default:
 127                 error = EOPNOTSUPP;
 128                 break;
 129
 130         }
 131
 132         return (error);
 133 }
 134
 135 static int
 136 prototype_open(struct cdev *dev __unused, int oflags __unused, int devtype __unused, struct thread *td __unused)
 137 {
 138         return (0);
 139 }
 140
 141 SYSINIT(prototype_load, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY, prototype_load, NULL);
 142 SYSUNINIT(prototype_unload, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY, prototype_unload, NULL);
 143
 144 DEV_MODULE(prototype, prototype_modevent, NULL);
 145 MODULE_VERSION(prototype, 1);
 146 MODULE_DEPEND(prototype, dtrace, 1, 1, 1);
 147 MODULE_DEPEND(prototype, opensolaris, 1, 1, 1);