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64 lines
1.4 KiB
64 lines
1.4 KiB
20 years ago
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/*
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* Copyright (C) 2002 - 2003 Jeff Dike (jdike@addtoit.com)
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* Licensed under the GPL
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*/
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#include "linux/kernel.h"
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#include "linux/list.h"
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#include "linux/slab.h"
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#include "linux/signal.h"
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#include "linux/interrupt.h"
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#include "init.h"
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#include "sigio.h"
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#include "irq_user.h"
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#include "irq_kern.h"
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/* Protected by sigio_lock() called from write_sigio_workaround */
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static int sigio_irq_fd = -1;
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static irqreturn_t sigio_interrupt(int irq, void *data, struct pt_regs *unused)
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{
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read_sigio_fd(sigio_irq_fd);
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reactivate_fd(sigio_irq_fd, SIGIO_WRITE_IRQ);
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return(IRQ_HANDLED);
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}
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int write_sigio_irq(int fd)
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{
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int err;
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err = um_request_irq(SIGIO_WRITE_IRQ, fd, IRQ_READ, sigio_interrupt,
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SA_INTERRUPT | SA_SAMPLE_RANDOM, "write sigio",
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NULL);
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if(err){
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printk("write_sigio_irq : um_request_irq failed, err = %d\n",
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err);
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return(-1);
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}
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sigio_irq_fd = fd;
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return(0);
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}
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static DEFINE_SPINLOCK(sigio_spinlock);
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void sigio_lock(void)
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{
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spin_lock(&sigio_spinlock);
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}
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void sigio_unlock(void)
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{
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spin_unlock(&sigio_spinlock);
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}
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/*
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* Overrides for Emacs so that we follow Linus's tabbing style.
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* Emacs will notice this stuff at the end of the file and automatically
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* adjust the settings for this buffer only. This must remain at the end
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* of the file.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-file-style: "linux"
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* End:
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*/
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