163 lines
3.3 KiB
C
163 lines
3.3 KiB
C
/*
|
|
* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
|
|
* Licensed under the GPL
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
#include <signal.h>
|
|
#include <string.h>
|
|
#include <sys/poll.h>
|
|
#include <sys/types.h>
|
|
#include <sys/time.h>
|
|
#include "user_util.h"
|
|
#include "kern_util.h"
|
|
#include "user.h"
|
|
#include "process.h"
|
|
#include "sigio.h"
|
|
#include "irq_user.h"
|
|
#include "os.h"
|
|
|
|
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("sigio_handler: 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_isatty(int fd)
|
|
{
|
|
return(isatty(fd));
|
|
}
|
|
|
|
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 {
|
|
/* remove not used tmp_pfd */
|
|
if (tmp_pfd != NULL)
|
|
kfree(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("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)
|
|
{
|
|
set_handler(SIGIO, SIG_IGN, 0, -1);
|
|
}
|
|
|
|
void init_irq_signals(int on_sigstack)
|
|
{
|
|
__sighandler_t h;
|
|
int flags;
|
|
|
|
flags = on_sigstack ? SA_ONSTACK : 0;
|
|
if(timer_irq_inited) h = (__sighandler_t) alarm_handler;
|
|
else h = boot_timer_handler;
|
|
|
|
set_handler(SIGVTALRM, h, flags | SA_RESTART,
|
|
SIGUSR1, SIGIO, SIGWINCH, SIGALRM, -1);
|
|
set_handler(SIGIO, (__sighandler_t) sig_handler, flags | SA_RESTART,
|
|
SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
|
|
signal(SIGWINCH, SIG_IGN);
|
|
}
|