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