projects / linux-2.6 / blame
| Commit | Line | Data |
|---|---|---|
| 8e367065 | 1 | /* |
| 1da177e4 LT |
2 | * Copyright (C) 2002 - 2003 Jeff Dike (jdike@addtoit.com) |
| 3 | * Licensed under the GPL | |
| 4 | */ | |
| 5 | ||
| 6 | #include "linux/kernel.h" | |
| 7 | #include "linux/list.h" | |
| 8 | #include "linux/slab.h" | |
| 9 | #include "linux/signal.h" | |
| 10 | #include "linux/interrupt.h" | |
| 11 | #include "init.h" | |
| 12 | #include "sigio.h" | |
| 13 | #include "irq_user.h" | |
| 14 | #include "irq_kern.h" | |
| 8e367065 | 15 | #include "os.h" |
| 1da177e4 LT |
16 | |
| 17 | /* Protected by sigio_lock() called from write_sigio_workaround */ | |
| 18 | static int sigio_irq_fd = -1; | |
| 19 | ||
| 7bea96fd | 20 | static irqreturn_t sigio_interrupt(int irq, void *data) |
| 1da177e4 | 21 | { |
| 8e367065 JD |
22 | char c; |
| 23 | ||
| a6ea4cce | 24 | os_read_file(sigio_irq_fd, &c, sizeof(c)); |
| 1da177e4 | 25 | reactivate_fd(sigio_irq_fd, SIGIO_WRITE_IRQ); |
| 4cffb7fa | 26 | return IRQ_HANDLED; |
| 1da177e4 LT |
27 | } |
| 28 | ||
| 29 | int write_sigio_irq(int fd) | |
| 30 | { | |
| 31 | int err; | |
| 32 | ||
| 33 | err = um_request_irq(SIGIO_WRITE_IRQ, fd, IRQ_READ, sigio_interrupt, | |
| 1d3468a6 | 34 | IRQF_DISABLED|IRQF_SAMPLE_RANDOM, "write sigio", |
| 1da177e4 LT |
35 | NULL); |
| 36 | if(err){ | |
| 37 | printk("write_sigio_irq : um_request_irq failed, err = %d\n", | |
| 38 | err); | |
| 4cffb7fa | 39 | return -1; |
| 1da177e4 LT |
40 | } |
| 41 | sigio_irq_fd = fd; | |
| 4cffb7fa | 42 | return 0; |
| 1da177e4 LT |
43 | } |
| 44 | ||
| d9f9d319 | 45 | /* These are called from os-Linux/sigio.c to protect its pollfds arrays. */ |
| 1da177e4 LT |
46 | static DEFINE_SPINLOCK(sigio_spinlock); |
| 47 | ||
| 48 | void sigio_lock(void) | |
| 49 | { | |
| 50 | spin_lock(&sigio_spinlock); | |
| 51 | } | |
| 52 | ||
| 53 | void sigio_unlock(void) | |
| 54 | { | |
| 55 | spin_unlock(&sigio_spinlock); | |
| 56 | } |