2 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
3 * Licensed under the GPL
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));
19 reactivate_fd(sigio_irq_fd, SIGIO_WRITE_IRQ);
23 int write_sigio_irq(int fd)
27 err = um_request_irq(SIGIO_WRITE_IRQ, fd, IRQ_READ, sigio_interrupt,
28 IRQF_DISABLED|IRQF_SAMPLE_RANDOM, "write sigio",
31 printk(KERN_ERR "write_sigio_irq : um_request_irq failed, "
39 /* These are called from os-Linux/sigio.c to protect its pollfds arrays. */
40 static DEFINE_SPINLOCK(sigio_spinlock);
44 spin_lock(&sigio_spinlock);
47 void sigio_unlock(void)
49 spin_unlock(&sigio_spinlock);