Re: ioctl
Re: ioctl
- Subject: Re: ioctl
- From: Mark Day <email@hidden>
- Date: Wed, 24 Apr 2002 16:04:26 -0700
This following code was built under Mac OS X 10.1.4, but I assume it
would work in Darwin. It will print the block size and block count for
a disk device (character or block special) that you pass on the command
line.
-Mark
#include <stdio.h>
#include <errno.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <dev/disk.h>
static void diskinfo(char *path)
{
int err;
int fd;
int block_size;
int block_count;
u_int64_t block_count64;
struct stat st;
err = stat(path, &st);
if (err)
{
fprintf(stderr, "Can't open %s: %s (%d)\n", path,
strerror(errno), errno);
return;
}
if (!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode))
{
fprintf(stderr, "Not a special device: %s\n", path);
return;
}
fd = open(path, O_RDONLY, 0);
if (fd < 0)
{
fprintf(stderr, "Can't open %s: %s (%d)\n", path,
strerror(errno), errno);
return;
}
err = ioctl(fd, DKIOCGETBLOCKSIZE, &block_size);
if (err)
{
fprintf(stderr, "Can't get block size of %s: %s (%d)\n", path,
strerror(errno), errno);
goto EXIT;
}
else
{
printf("%s: block size = %d\n", path, block_size);
}
err = ioctl(fd, DKIOCGETBLOCKCOUNT, &block_count);
if (err)
{
fprintf(stderr, "Can't get block count of %s: %s (%d)\n",
path, strerror(errno), errno);
goto EXIT;
}
else
{
printf("%s: block count = %d\n", path, block_count);
}
EXIT:
(void) close(fd);
}
int main(int argc, char *argv[])
{
int i;
if (argc>1)
{
for (i=1; i<argc; ++i)
diskinfo(argv[i]);
}
else
{
printf("DKIOCGETBLOCKSIZE = 0xX\n", DKIOCGETBLOCKSIZE);
printf("DKIOCGETBLOCKCOUNT = 0xX\n", DKIOCGETBLOCKCOUNT);
}
}
On Wednesday, April 24, 2002, at 01:30 PM, devdrvr wrote:
There is pretty standard C ioctl call we need to make to access and get
info
back from connected ATA disk drives. After you do an open the call
takes a
string of /dev/... for the exact drive you want. We can't seem to get
this
call to come back with anything but an error. Is anyone else using it
or can
attest to it working? Or is there sample code I can look at that shows
how
to properly address devices with the call? We've got the right Darwin
headers etc.
_______________________________________________
cocoa-dev mailing list | email@hidden
Help/Unsubscribe/Archives:
http://www.lists.apple.com/mailman/listinfo/cocoa-dev
Do not post admin requests to the list. They will be ignored.
| References: | |
| | >ioctl (From: devdrvr <email@hidden>) |