分类：
2008-04-08 17:04:00
下列代码是本章所述的 dummy 驱动程序的完整源代码：
/* * Minimalist pseudo-device. * Writes a message whenever a routine is entered. * * Build the driver: * cc -D_KERNEL -c dummy.c * ld -r -o dummy dummy.o * Copy the driver and the configuration file to /usr/kernel/drv: * cp dummy.conf /usr/kernel/drv * cp dummy /tmp * ln -s /tmp/dummy /usr/kernel/drv/dummy * Add the driver: * add_drv dummy * Test (1) read from driver (2) write to driver: * cat /devices/pseudo/dummy@* * echo hello > `ls /devices/pseudo/dummy@*` * Verify the tests in another window: * tail -f /var/adm/messages * Remove the driver: * rem_drv dummy */ #include/* used by dev_ops */ #include /* used by dev_ops and cb_ops */ #include /* used by modlinkage, modldrv, _init, _info, */ /* and _fini */ #include /* used by open, close, read, write, prop_op, */ /* and ddi_prop_op */ #include /* used by open, close */ #include /* used by open, close, read, write */ #include /* used by open, close, read, write */ #include /* used by open, close, read */ #include /* used by read */ #include /* defines S_IFCHR used by ddi_create_minor_node */ #include /* used by all entry points for this driver */ #include /* used by all entry points for this driver */ /* also used by cb_ops, ddi_get_instance, and */ /* ddi_prop_op */ #include /* used by all entry points for this driver */ /* also used by cb_ops, ddi_create_minor_node, */ /* ddi_get_instance, and ddi_prop_op */ static int dummy_attach(dev_info_t *dip, ddi_attach_cmd_t cmd); static int dummy_detach(dev_info_t *dip, ddi_detach_cmd_t cmd); static int dummy_getinfo(dev_info_t *dip, ddi_info_cmd_t cmd, void *arg, void **resultp); static int dummy_prop_op(dev_t dev, dev_info_t *dip, ddi_prop_op_t prop_op, int flags, char *name, caddr_t valuep, int *lengthp); static int dummy_open(dev_t *devp, int flag, int otyp, cred_t *cred); static int dummy_close(dev_t dev, int flag, int otyp, cred_t *cred); static int dummy_read(dev_t dev, struct uio *uiop, cred_t *credp); static int dummy_write(dev_t dev, struct uio *uiop, cred_t *credp); /* cb_ops structure */ static struct cb_ops dummy_cb_ops = { dummy_open, dummy_close, nodev, /* no strategy - nodev returns ENXIO */ nodev, /* no print */ nodev, /* no dump */ dummy_read, dummy_write, nodev, /* no ioctl */ nodev, /* no devmap */ nodev, /* no mmap */ nodev, /* no segmap */ nochpoll, /* returns ENXIO for non-pollable devices */ dummy_prop_op, NULL, /* streamtab struct; if not NULL, all above */ /* fields are ignored */ D_NEW | D_MP, /* compatibility flags: see conf.h */ CB_REV, /* cb_ops revision number */ nodev, /* no aread */ nodev /* no awrite */ }; /* dev_ops structure */ static struct dev_ops dummy_dev_ops = { DEVO_REV, 0, /* reference count */ dummy_getinfo, nulldev, /* no identify - nulldev returns 0 */ nulldev, /* no probe */ dummy_attach, dummy_detach, nodev, /* no reset - nodev returns ENXIO */ &dummy_cb_ops, (struct bus_ops *)NULL, nodev /* no power */ }; /* modldrv structure */ static struct modldrv md = { &mod_driverops, /* Type of module. This is a driver. */ "dummy driver", /* Name of the module. */ &dummy_dev_ops }; /* modlinkage structure */ static struct modlinkage ml = { MODREV_1, &md, NULL }; /* dev_info structure */ dev_info_t *dummy_dip; /* keep track of one instance */ /* Loadable module configuration entry points */ int _init(void) { cmn_err(CE_NOTE, "Inside _init"); return(mod_install(&ml)); } int _info(struct modinfo *modinfop) { cmn_err(CE_NOTE, "Inside _info"); return(mod_info(&ml, modinfop)); } int _fini(void) { cmn_err(CE_NOTE, "Inside _fini"); return(mod_remove(&ml)); } /* Device configuration entry points */ static int dummy_attach(dev_info_t *dip, ddi_attach_cmd_t cmd) { cmn_err(CE_NOTE, "Inside dummy_attach"); switch(cmd) { case DDI_ATTACH: dummy_dip = dip; if (ddi_create_minor_node(dip, "0", S_IFCHR, ddi_get_instance(dip), DDI_PSEUDO,0) != DDI_SUCCESS) { cmn_err(CE_NOTE, "%s%d: attach: could not add character node.", "dummy", 0); return(DDI_FAILURE); } else return DDI_SUCCESS; default: return DDI_FAILURE; } } static int dummy_detach(dev_info_t *dip, ddi_detach_cmd_t cmd) { cmn_err(CE_NOTE, "Inside dummy_detach"); switch(cmd) { case DDI_DETACH: dummy_dip = 0; ddi_remove_minor_node(dip, NULL); return DDI_SUCCESS; default: return DDI_FAILURE; } } static int dummy_getinfo(dev_info_t *dip, ddi_info_cmd_t cmd, void *arg, void **resultp) { cmn_err(CE_NOTE, "Inside dummy_getinfo"); switch(cmd) { case DDI_INFO_DEVT2DEVINFO: *resultp = dummy_dip; return DDI_SUCCESS; case DDI_INFO_DEVT2INSTANCE: *resultp = 0; return DDI_SUCCESS; default: return DDI_FAILURE; } } /* Main entry points */ static int dummy_prop_op(dev_t dev, dev_info_t *dip, ddi_prop_op_t prop_op, int flags, char *name, caddr_t valuep, int *lengthp) { cmn_err(CE_NOTE, "Inside dummy_prop_op"); return(ddi_prop_op(dev,dip,prop_op,flags,name,valuep,lengthp)); } static int dummy_open(dev_t *devp, int flag, int otyp, cred_t *cred) { cmn_err(CE_NOTE, "Inside dummy_open"); return DDI_SUCCESS; } static int dummy_close(dev_t dev, int flag, int otyp, cred_t *cred) { cmn_err(CE_NOTE, "Inside dummy_close"); return DDI_SUCCESS; } static int dummy_read(dev_t dev, struct uio *uiop, cred_t *credp) { cmn_err(CE_NOTE, "Inside dummy_read"); return DDI_SUCCESS; } static int dummy_write(dev_t dev, struct uio *uiop, cred_t *credp) { cmn_err(CE_NOTE, "Inside dummy_write"); return DDI_SUCCESS; }
