139 lines
2.9 KiB
C
139 lines
2.9 KiB
C
|
/*
|
||
|
|
* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
|
||
|
|
* Licensed under the GPL
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <errno.h>
|
||
|
|
#include <poll.h>
|
||
|
|
#include <signal.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include "irq_user.h"
|
||
|
|
#include "kern_constants.h"
|
||
|
|
#include "os.h"
|
||
|
|
#include "process.h"
|
||
|
|
#include "um_malloc.h"
|
||
|
|
#include "user.h"
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Locked by irq_lock in arch/um/kernel/irq.c. Changed by os_create_pollfd
|
||
|
|
* and os_free_irq_by_cb, which are called under irq_lock.
|
||
|
|
*/
|
||
|
|
static struct pollfd *pollfds = NULL;
|
||
|
|
static int pollfds_num = 0;
|
||
|
|
static int pollfds_size = 0;
|
||
|
|
|
||
|
|
int os_waiting_for_events(struct irq_fd *active_fds)
|
||
|
|
{
|
||
|
|
struct irq_fd *irq_fd;
|
||
|
|
int i, n, err;
|
||
|
|
|
||
|
|
n = poll(pollfds, pollfds_num, 0);
|
||
|
|
if (n < 0) {
|
||
|
|
err = -errno;
|
||
|
|
if (errno != EINTR)
|
||
|
|
printk(UM_KERN_ERR "os_waiting_for_events:"
|
||
|
|
" poll returned %d, errno = %d\n", n, errno);
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (n == 0)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
irq_fd = active_fds;
|
||
|
|
|
||
|
|
for (i = 0; i < pollfds_num; i++) {
|
||
|
|
if (pollfds[i].revents != 0) {
|
||
|
|
irq_fd->current_events = pollfds[i].revents;
|
||
|
|
pollfds[i].fd = -1;
|
||
|
|
}
|
||
|
|
irq_fd = irq_fd->next;
|
||
|
|
}
|
||
|
|
return n;
|
||
|
|
}
|
||
|
|
|
||
|
|
int os_create_pollfd(int fd, int events, void *tmp_pfd, int size_tmpfds)
|
||
|
|
{
|
||
|
|
if (pollfds_num == pollfds_size) {
|
||
|
|
if (size_tmpfds <= pollfds_size * sizeof(pollfds[0])) {
|
||
|
|
/* return min size needed for new pollfds area */
|
||
|
|
return (pollfds_size + 1) * sizeof(pollfds[0]);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (pollfds != NULL) {
|
||
|
|
memcpy(tmp_pfd, pollfds,
|
||
|
|
sizeof(pollfds[0]) * pollfds_size);
|
||
|
|
/* remove old pollfds */
|
||
|
|
kfree(pollfds);
|
||
|
|
}
|
||
|
|
pollfds = tmp_pfd;
|
||
|
|
pollfds_size++;
|
||
|
|
} else
|
||
|
|
kfree(tmp_pfd); /* remove not used tmp_pfd */
|
||
|
|
|
||
|
|
pollfds[pollfds_num] = ((struct pollfd) { .fd = fd,
|
||
|
|
.events = events,
|
||
|
|
.revents = 0 });
|
||
|
|
pollfds_num++;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
void os_free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg,
|
||
|
|
struct irq_fd *active_fds, struct irq_fd ***last_irq_ptr2)
|
||
|
|
{
|
||
|
|
struct irq_fd **prev;
|
||
|
|
int i = 0;
|
||
|
|
|
||
|
|
prev = &active_fds;
|
||
|
|
while (*prev != NULL) {
|
||
|
|
if ((*test)(*prev, arg)) {
|
||
|
|
struct irq_fd *old_fd = *prev;
|
||
|
|
if ((pollfds[i].fd != -1) &&
|
||
|
|
(pollfds[i].fd != (*prev)->fd)) {
|
||
|
|
printk(UM_KERN_ERR "os_free_irq_by_cb - "
|
||
|
|
"mismatch between active_fds and "
|
||
|
|
"pollfds, fd %d vs %d\n",
|
||
|
|
(*prev)->fd, pollfds[i].fd);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
pollfds_num--;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This moves the *whole* array after pollfds[i]
|
||
|
|
* (though it doesn't spot as such)!
|
||
|
|
*/
|
||
|
|
memmove(&pollfds[i], &pollfds[i + 1],
|
||
|
|
(pollfds_num - i) * sizeof(pollfds[0]));
|
||
|
|
if (*last_irq_ptr2 == &old_fd->next)
|
||
|
|
*last_irq_ptr2 = prev;
|
||
|
|
|
||
|
|
*prev = (*prev)->next;
|
||
|
|
if (old_fd->type == IRQ_WRITE)
|
||
|
|
ignore_sigio_fd(old_fd->fd);
|
||
|
|
kfree(old_fd);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
prev = &(*prev)->next;
|
||
|
|
i++;
|
||
|
|
}
|
||
|
|
out:
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
int os_get_pollfd(int i)
|
||
|
|
{
|
||
|
|
return pollfds[i].fd;
|
||
|
|
}
|
||
|
|
|
||
|
|
void os_set_pollfd(int i, int fd)
|
||
|
|
{
|
||
|
|
pollfds[i].fd = fd;
|
||
|
|
}
|
||
|
|
|
||
|
|
void os_set_ioignore(void)
|
||
|
|
{
|
||
|
|
signal(SIGIO, SIG_IGN);
|
||
|
|
}
|