/*
* /dev/null code
*/
int null_lseek(struct inode *inode, struct file *filp,
off_t offset, int origin)
{
debugmem("null_lseek()\n");
filp->f_pos = 0;
return 0;
}
/*
* generally useful code...
*/
int memory_lseek(struct inode *inode, register struct file *filp,
loff_t offset, unsigned int origin)
{
loff_t tmp = offset;
debugmem("mem_lseek()\n");
switch (origin) {
case 1:
tmp += filp->f_pos;
case 0:
break;
default:
return -EINVAL;
}
if (tmp < 0)
return -EINVAL;
if (tmp != filp->f_pos) {
filp->f_pos = tmp;
#ifdef BLOAT_FS
filp->f_reada = 0;
filp->f_version = ++event;
#endif
}
return 0;
}
/*
* /dev/zero code
*/
size_t zero_read(struct inode *inode, struct file *filp, char *data, int len)
{
debugmem("zero_read()\n");
fmemset(data, current->mm.dseg, 0, (size_t) len);
filp->f_pos += len;
return (size_t)len;
}
int
hdebug(HConnect *c)
{
char *scorestr, *op;
u8int score[VtScoreSize];
if(hsethtml(c) < 0)
return -1;
hprint(&c->hout, "<h1>venti debug</h1>\n");
op = hargstr(c, "op", "");
if(!op[0]){
hprint(&c->hout, "no op\n");
return 0;
}
if(strcmp(op, "amap") == 0){
debugamap(c);
return 0;
}
if(strcmp(op, "mem") == 0){
debugmem(c);
return 0;
}
if(strcmp(op, "read") == 0){
scorestr = hargstr(c, "score", "");
if(vtparsescore(scorestr, nil, score) < 0){
hprint(&c->hout, "bad score %s: %r\n", scorestr);
return 0;
}
debugread(c, score);
return 0;
}
hprint(&c->hout, "unknown op %s", op);
return 0;
}
/*
* /dev/full code
*/
size_t full_read(struct inode *inode, struct file *filp, char *data, int len)
{
debugmem("full_read()\n");
filp->f_pos += len;
return len;
}
size_t null_read(struct inode *inode, struct file *filp, char *data, int len)
{
debugmem("null_read()\n");
return 0;
}
