static void do_pollfd(unsigned int num, struct pollfd * fdpage,
poll_table ** pwait, int *count)
{
int i;
for (i = 0; i < num; i++) {
int fd;
unsigned int mask;
struct pollfd *fdp;
mask = 0;
fdp = fdpage+i;
fd = fdp->fd;
if (fd >= 0) {
struct file * file = fget(fd);
mask = POLLNVAL;
if (file != NULL) {
ltt_ev_file_system(LTT_EV_FILE_SYSTEM_POLL,
fd,
0,
NULL);
mask = DEFAULT_POLLMASK;
if (file->f_op && file->f_op->poll)
mask = file->f_op->poll(file, *pwait);
mask &= fdp->events | POLLERR | POLLHUP;
fput(file);
}
if (mask) {
*pwait = NULL;
(*count)++;
}
}
fdp->revents = mask;
}
}
asmlinkage long sys_open(const char __user * filename, int flags, int mode)
{
char * tmp;
int fd, error;
#if BITS_PER_LONG != 32
flags |= O_LARGEFILE;
#endif
tmp = getname(filename);
fd = PTR_ERR(tmp);
if (!IS_ERR(tmp)) {
fd = get_unused_fd();
if (fd >= 0) {
struct file *f = filp_open(tmp, flags, mode);
error = PTR_ERR(f);
if (IS_ERR(f))
goto out_error;
ltt_ev_file_system(LTT_EV_FILE_SYSTEM_OPEN,
fd,
f->f_dentry->d_name.len,
f->f_dentry->d_name.name);
fd_install(fd, f);
}
out:
putname(tmp);
}
return fd;
out_error:
put_unused_fd(fd);
fd = error;
goto out;
}
/*
* Careful here! We test whether the file pointer is NULL before
* releasing the fd. This ensures that one clone task can't release
* an fd while another clone is opening it.
*/
asmlinkage long sys_close(unsigned int fd)
{
struct file * filp;
struct files_struct *files = current->files;
spin_lock(&files->file_lock);
if (fd >= files->max_fds)
goto out_unlock;
filp = files->fd[fd];
if (!filp)
goto out_unlock;
ltt_ev_file_system(LTT_EV_FILE_SYSTEM_CLOSE,
fd,
0,
NULL);
files->fd[fd] = NULL;
FD_CLR(fd, files->close_on_exec);
__put_unused_fd(files, fd);
spin_unlock(&files->file_lock);
return filp_close(filp, files);
out_unlock:
spin_unlock(&files->file_lock);
return -EBADF;
}
int do_select(int n, fd_set_bits *fds, long *timeout)
{
struct poll_wqueues table;
poll_table *wait;
int retval, i;
long __timeout = *timeout;
spin_lock(¤t->files->file_lock);
retval = max_select_fd(n, fds);
spin_unlock(¤t->files->file_lock);
if (retval < 0)
return retval;
n = retval;
poll_initwait(&table);
wait = &table.pt;
if (!__timeout)
wait = NULL;
retval = 0;
for (;;) {
unsigned long *rinp, *routp, *rexp, *inp, *outp, *exp;
set_current_state(TASK_INTERRUPTIBLE);
inp = fds->in;
outp = fds->out;
exp = fds->ex;
rinp = fds->res_in;
routp = fds->res_out;
rexp = fds->res_ex;
for (i = 0; i < n; ++rinp, ++routp, ++rexp) {
unsigned long in, out, ex, all_bits, bit = 1, mask, j;
unsigned long res_in = 0, res_out = 0, res_ex = 0;
struct file_operations *f_op = NULL;
struct file *file = NULL;
in = *inp++;
out = *outp++;
ex = *exp++;
all_bits = in | out | ex;
if (all_bits == 0) {
i += __NFDBITS;
continue;
}
for (j = 0; j < __NFDBITS; ++j, ++i, bit <<= 1) {
if (i >= n)
break;
if (!(bit & all_bits))
continue;
file = fget(i);
if (file) {
f_op = file->f_op;
ltt_ev_file_system(LTT_EV_FILE_SYSTEM_SELECT,
i /* The fd*/,
__timeout,
NULL);
mask = DEFAULT_POLLMASK;
if (f_op && f_op->poll)
mask = (*f_op->poll)(file, retval ? NULL : wait);
fput(file);
if ((mask & POLLIN_SET) && (in & bit)) {
res_in |= bit;
retval++;
}
if ((mask & POLLOUT_SET) && (out & bit)) {
res_out |= bit;
retval++;
}
if ((mask & POLLEX_SET) && (ex & bit)) {
res_ex |= bit;
retval++;
}
}
cond_resched();
}
if (res_in)
*rinp = res_in;
if (res_out)
*routp = res_out;
if (res_ex)
*rexp = res_ex;
}
wait = NULL;
if (retval || !__timeout || signal_pending(current))
break;
if(table.error) {
retval = table.error;
break;
}
__timeout = schedule_timeout(__timeout);
}
__set_current_state(TASK_RUNNING);
poll_freewait(&table);
/*
* Up-to-date the caller timeout.
*/
*timeout = __timeout;
return retval;
}
