Messages in this thread | ![/](/images/icornerl.gif) | | From | Olaf Dietsche <> | Subject | Re: writing from kernel | Date | Sun, 05 Jan 2003 01:26:19 +0100 |
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"anil vijarnia" <linux_ker@rediffmail.com> writes:
> can anyone tell me how to write into i file from kernel space. > i tried sys_open,sys_write functions bbbbbut they don't work > from > my module.
As others already pointed out, it's not always a good idea to do this from kernel space. However, if you still want to do it, see snippet below. If you want to write, you have to copy kernel_read() from fs/exec.c and modify it for writing.
Regards, Olaf.
--cut here-->8-- #include <linux/fs.h>
struct file *filp; unsigned long offset = 0; char buf[1024]; int n;
filp = filp_open("/path/to/some/file", O_RDONLY, 0); if (!filp || IS_ERR(filp)) { /* do some error handling */ }
n = kernel_read(filp, offset, buf, sizeof(buf)); if (n != sizeof(buf)) { /* do some checking */ }
filp_close(filp, 0); --8<--cut here-- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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