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#include <kernel/fd.h>
#include <kernel/mem.h>
#include <kernel/panic.h>
#include <kernel/proc.h>
static int fdop_special_tty(struct fdop_args *args);
int fdop_dispatch(struct fdop_args args) {
switch(args.fd->type) {
case FD_EMPTY: {
if (args.type == FDOP_MOUNT) // mounting an empty fd is allowed
return 0;
return -1;
}
case FD_SPECIAL_TTY:
return fdop_special_tty(&args);
default:
panic();
}
}
static int fdop_special_tty(struct fdop_args *args) {
switch(args->type) {
case FDOP_MOUNT:
return 0; // no special action needed
case FDOP_OPEN:
/* don't allow anything after the mount point
* this is a file, not a directory
* for example: open("/tty") is allowed. open("/tty/smth") isn't */
if (args->open.len == 0) {
args->open.target->type = FD_SPECIAL_TTY;
return 0;
}
return -1;
case FDOP_READ:
return -1; // input not implemented yet
case FDOP_WRITE: {
struct virt_iter iter;
virt_iter_new(&iter, args->rw.ptr, args->rw.len,
process_current->pages, true, false);
while (virt_iter_next(&iter))
tty_write(iter.frag, iter.frag_len);
return iter.prior;
}
case FDOP_CLOSE:
args->fd->type = FD_EMPTY;
return 0;
default: panic();
}
}
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