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Register a block device and support read/write to it.

This commit is contained in:
pooka 2007-11-21 18:11:17 +00:00
parent 750d633918
commit cf9f5c8530
1 changed files with 19 additions and 9 deletions
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28
share/examples/pud/intro/intro.c
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@ -1,4 +1,4 @@
/* $NetBSD: intro.c,v 1.1 2007/11/20 18:58:17 pooka Exp $ */
/* $NetBSD: intro.c,v 1.2 2007/11/21 18:11:17 pooka Exp $ */
/*
* El extra-simplo example of the userspace driver framework.
@ -61,7 +61,7 @@ main(int argc, char *argv[])
pcr.pm_pdr.pdr_reqtype = PUD_CONF_REG;
pcr.pm_regdev = makedev(377, 0);
pcr.pm_flags = 0;
pcr.pm_flags = PUD_CONFFLAG_BDEV;
strlcpy(pcr.pm_devname, "testdev", sizeof(pcr.pm_devname));
n = write(fd, &pcr, pcr.pm_pdr.pdr_pth.pth_framelen);
@ -73,12 +73,7 @@ main(int argc, char *argv[])
*/
for (;;) {
n = read(fd, pdr, DEFALLOC);
printf("read %d\n", n);
if (pdr->pdr_reqclass != PUD_REQ_CDEV) {
printf("class %d not supported\n", pdr->pdr_reqclass);
abort();
}
printf("read %d %d\n", n, errno);
switch (pdr->pdr_reqtype) {
case PUD_CDEV_OPEN:
@ -88,24 +83,39 @@ main(int argc, char *argv[])
break;
case PUD_CDEV_READ:
/* uh oh case PUD_BDEV_STRATREAD: */
{
struct pud_creq_read *pc_read;
size_t clen;
pc_read = (void *)pdr;
printf("read from offset %llu, resid %zu\n",
(unsigned long long)pc_read->pm_offset,
pc_read->pm_resid);
clen = MIN(strlen(ECHOSTR), pc_read->pm_resid);
strncpy(pc_read->pm_data, ECHOSTR, clen);
pc_read->pm_resid -= clen;
if (pdr->pdr_reqclass == PUD_REQ_BDEV) {
clen = pc_read->pm_resid;
pc_read->pm_resid = 0;
} else {
pc_read->pm_resid -= clen;
}
pdr->pdr_pth.pth_framelen =
sizeof(struct pud_creq_read) + clen;
}
break;
case PUD_CDEV_WRITE:
/* uh uh oh case PUD_BDEV_STRATWRITE: */
{
struct pud_creq_write *pc_write;
pc_write = (void *)pdr;
printf("write to offset %llu, resid %zu\n",
(unsigned long long)pc_write->pm_offset,
pc_write->pm_resid);
pc_write->pm_data[pc_write->pm_resid] = '\0';
printf("got via write: %s", pc_write->pm_data);
pdr->pdr_pth.pth_framelen =