1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
6 #include <linux/interrupt.h>
11 /* Protected by sigio_lock() called from write_sigio_workaround */
12 static int sigio_irq_fd = -1;
14 static irqreturn_t sigio_interrupt(int irq, void *data)
18 os_read_file(sigio_irq_fd, &c, sizeof(c));
22 int write_sigio_irq(int fd)
26 err = um_request_irq(SIGIO_WRITE_IRQ, fd, IRQ_READ, sigio_interrupt,
27 0, "write sigio", NULL);
29 printk(KERN_ERR "write_sigio_irq : um_request_irq failed, "
37 /* These are called from os-Linux/sigio.c to protect its pollfds arrays. */
38 static DEFINE_MUTEX(sigio_mutex);
42 mutex_lock(&sigio_mutex);
45 void sigio_unlock(void)
47 mutex_unlock(&sigio_mutex);