53 lines
910 B
C
53 lines
910 B
C
#include "../file.h"
|
|
|
|
#include <errno.h>
|
|
#include <fs/context.h>
|
|
#include <fs/file.h>
|
|
#include <fs/status.h>
|
|
#include <sys/types.h>
|
|
|
|
extern kern_status_t fs_msg_seek(
|
|
xpc_context_t *xpc,
|
|
const xpc_endpoint_t *sender,
|
|
off_t rel_offset,
|
|
int origin,
|
|
int *out_err,
|
|
off_t *out_new_pos,
|
|
void *arg)
|
|
{
|
|
struct fs_context *ctx = arg;
|
|
struct fs_file *f = fs_context_get_file(ctx, sender->e_port);
|
|
if (!f) {
|
|
*out_err = EBADF;
|
|
return KERN_OK;
|
|
}
|
|
|
|
off_t new_offset = 0;
|
|
|
|
switch (origin) {
|
|
case SEEK_SET:
|
|
new_offset = rel_offset;
|
|
break;
|
|
case SEEK_CUR:
|
|
new_offset = f->f_seek + rel_offset;
|
|
break;
|
|
case SEEK_END:
|
|
new_offset = f->f_inode->i_size + rel_offset;
|
|
break;
|
|
default:
|
|
*out_err = EINVAL;
|
|
return KERN_OK;
|
|
}
|
|
|
|
if (new_offset > f->f_inode->i_size) {
|
|
*out_err = EINVAL;
|
|
return KERN_OK;
|
|
}
|
|
|
|
f->f_seek = new_offset;
|
|
*out_err = SUCCESS;
|
|
*out_new_pos = new_offset;
|
|
|
|
return KERN_OK;
|
|
}
|