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arch
um
kernel
sigio.c
Go to the documentation of this file.
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/*
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* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
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* Licensed under the GPL
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*/
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#include <
linux/interrupt.h
>
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#include <
irq_kern.h
>
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#include <os.h>
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#include <
sigio.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
)
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{
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char
c
;
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os_read_file
(sigio_irq_fd, &c,
sizeof
(c));
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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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0,
"write sigio"
,
NULL
);
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if
(err) {
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printk
(
KERN_ERR
"write_sigio_irq : um_request_irq failed, "
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"err = %d\n"
, 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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/* These are called from os-Linux/sigio.c to protect its pollfds arrays. */
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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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