Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
63920f47 | 2 | * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
1da177e4 LT |
3 | * Licensed under the GPL |
4 | */ | |
5 | ||
63920f47 JD |
6 | #include <linux/slab.h> |
7 | #include <linux/completion.h> | |
8 | #include <linux/irqreturn.h> | |
9 | #include <asm/irq.h> | |
1da177e4 | 10 | #include "irq_kern.h" |
1da177e4 | 11 | #include "os.h" |
1da177e4 LT |
12 | |
13 | struct xterm_wait { | |
14 | struct completion ready; | |
15 | int fd; | |
16 | int pid; | |
17 | int new_fd; | |
18 | }; | |
19 | ||
7bea96fd | 20 | static irqreturn_t xterm_interrupt(int irq, void *data) |
1da177e4 LT |
21 | { |
22 | struct xterm_wait *xterm = data; | |
23 | int fd; | |
24 | ||
25 | fd = os_rcv_fd(xterm->fd, &xterm->pid); | |
63920f47 JD |
26 | if (fd == -EAGAIN) |
27 | return IRQ_NONE; | |
1da177e4 LT |
28 | |
29 | xterm->new_fd = fd; | |
30 | complete(&xterm->ready); | |
63920f47 JD |
31 | |
32 | return IRQ_HANDLED; | |
1da177e4 LT |
33 | } |
34 | ||
35 | int xterm_fd(int socket, int *pid_out) | |
36 | { | |
37 | struct xterm_wait *data; | |
38 | int err, ret; | |
39 | ||
40 | data = kmalloc(sizeof(*data), GFP_KERNEL); | |
63920f47 | 41 | if (data == NULL) { |
1da177e4 | 42 | printk(KERN_ERR "xterm_fd : failed to allocate xterm_wait\n"); |
63920f47 | 43 | return -ENOMEM; |
1da177e4 LT |
44 | } |
45 | ||
46 | /* This is a locked semaphore... */ | |
63920f47 JD |
47 | *data = ((struct xterm_wait) { .fd = socket, |
48 | .pid = -1, | |
49 | .new_fd = -1 }); | |
1da177e4 LT |
50 | init_completion(&data->ready); |
51 | ||
63920f47 | 52 | err = um_request_irq(XTERM_IRQ, socket, IRQ_READ, xterm_interrupt, |
aab94460 | 53 | IRQF_SHARED, "xterm", data); |
63920f47 | 54 | if (err) { |
1da177e4 LT |
55 | printk(KERN_ERR "xterm_fd : failed to get IRQ for xterm, " |
56 | "err = %d\n", err); | |
57 | ret = err; | |
58 | goto out; | |
59 | } | |
60 | ||
61 | /* ... so here we wait for an xterm interrupt. | |
62 | * | |
63 | * XXX Note, if the xterm doesn't work for some reason (eg. DISPLAY | |
64 | * isn't set) this will hang... */ | |
65 | wait_for_completion(&data->ready); | |
66 | ||
fa7a0449 | 67 | um_free_irq(XTERM_IRQ, data); |
1da177e4 LT |
68 | |
69 | ret = data->new_fd; | |
70 | *pid_out = data->pid; | |
71 | out: | |
72 | kfree(data); | |
73 | ||
63920f47 | 74 | return ret; |
1da177e4 | 75 | } |