1/*
2 * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
4 */
5
6#include "linux/errno.h"
7#include "linux/slab.h"
8#include "linux/signal.h"
9#include "linux/interrupt.h"
10#include "asm/irq.h"
11#include "irq_user.h"
12#include "irq_kern.h"
13#include "kern_util.h"
14#include "os.h"
15#include "xterm.h"
16
17struct xterm_wait {
18	struct completion ready;
19	int fd;
20	int pid;
21	int new_fd;
22};
23
24static irqreturn_t xterm_interrupt(int irq, void *data)
25{
26	struct xterm_wait *xterm = data;
27	int fd;
28
29	fd = os_rcv_fd(xterm->fd, &xterm->pid);
30	if(fd == -EAGAIN)
31		return(IRQ_NONE);
32
33	xterm->new_fd = fd;
34	complete(&xterm->ready);
35	return(IRQ_HANDLED);
36}
37
38int xterm_fd(int socket, int *pid_out)
39{
40	struct xterm_wait *data;
41	int err, ret;
42
43	data = kmalloc(sizeof(*data), GFP_KERNEL);
44	if(data == NULL){
45		printk(KERN_ERR "xterm_fd : failed to allocate xterm_wait\n");
46		return(-ENOMEM);
47	}
48
49	/* This is a locked semaphore... */
50	*data = ((struct xterm_wait)
51		{ .fd 		= socket,
52		  .pid 		= -1,
53		  .new_fd 	= -1 });
54	init_completion(&data->ready);
55
56	err = um_request_irq(XTERM_IRQ, socket, IRQ_READ, xterm_interrupt,
57			     IRQF_DISABLED | IRQF_SHARED | IRQF_SAMPLE_RANDOM,
58			     "xterm", data);
59	if (err){
60		printk(KERN_ERR "xterm_fd : failed to get IRQ for xterm, "
61		       "err = %d\n",  err);
62		ret = err;
63		goto out;
64	}
65
66	wait_for_completion(&data->ready);
67
68	free_irq(XTERM_IRQ, data);
69
70	ret = data->new_fd;
71	*pid_out = data->pid;
72 out:
73	kfree(data);
74
75	return(ret);
76}
77
78/*
79 * Overrides for Emacs so that we follow Linus's tabbing style.
80 * Emacs will notice this stuff at the end of the file and automatically
81 * adjust the settings for this buffer only.  This must remain at the end
82 * of the file.
83 * ---------------------------------------------------------------------------
84 * Local variables:
85 * c-file-style: "linux"
86 * End:
87 */
88