mirror of
https://github.com/torvalds/linux.git
synced 2024-11-01 09:41:44 +00:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
64 lines
1.4 KiB
C
64 lines
1.4 KiB
C
/*
|
|
* Copyright (C) 2002 - 2003 Jeff Dike (jdike@addtoit.com)
|
|
* Licensed under the GPL
|
|
*/
|
|
|
|
#include "linux/kernel.h"
|
|
#include "linux/list.h"
|
|
#include "linux/slab.h"
|
|
#include "linux/signal.h"
|
|
#include "linux/interrupt.h"
|
|
#include "init.h"
|
|
#include "sigio.h"
|
|
#include "irq_user.h"
|
|
#include "irq_kern.h"
|
|
|
|
/* Protected by sigio_lock() called from write_sigio_workaround */
|
|
static int sigio_irq_fd = -1;
|
|
|
|
static irqreturn_t sigio_interrupt(int irq, void *data, struct pt_regs *unused)
|
|
{
|
|
read_sigio_fd(sigio_irq_fd);
|
|
reactivate_fd(sigio_irq_fd, SIGIO_WRITE_IRQ);
|
|
return(IRQ_HANDLED);
|
|
}
|
|
|
|
int write_sigio_irq(int fd)
|
|
{
|
|
int err;
|
|
|
|
err = um_request_irq(SIGIO_WRITE_IRQ, fd, IRQ_READ, sigio_interrupt,
|
|
SA_INTERRUPT | SA_SAMPLE_RANDOM, "write sigio",
|
|
NULL);
|
|
if(err){
|
|
printk("write_sigio_irq : um_request_irq failed, err = %d\n",
|
|
err);
|
|
return(-1);
|
|
}
|
|
sigio_irq_fd = fd;
|
|
return(0);
|
|
}
|
|
|
|
static DEFINE_SPINLOCK(sigio_spinlock);
|
|
|
|
void sigio_lock(void)
|
|
{
|
|
spin_lock(&sigio_spinlock);
|
|
}
|
|
|
|
void sigio_unlock(void)
|
|
{
|
|
spin_unlock(&sigio_spinlock);
|
|
}
|
|
|
|
/*
|
|
* Overrides for Emacs so that we follow Linus's tabbing style.
|
|
* Emacs will notice this stuff at the end of the file and automatically
|
|
* adjust the settings for this buffer only. This must remain at the end
|
|
* of the file.
|
|
* ---------------------------------------------------------------------------
|
|
* Local variables:
|
|
* c-file-style: "linux"
|
|
* End:
|
|
*/
|