Linux 2.6.17.7
[linux/fpc-iii.git] / arch / um / drivers / xterm_kern.c
blobd269a80f4b0c665b70ef6f32422a53474efcb7af
1 /*
2 * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
4 */
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"
17 struct xterm_wait {
18 struct completion ready;
19 int fd;
20 int pid;
21 int new_fd;
24 static irqreturn_t xterm_interrupt(int irq, void *data, struct pt_regs *regs)
26 struct xterm_wait *xterm = data;
27 int fd;
29 fd = os_rcv_fd(xterm->fd, &xterm->pid);
30 if(fd == -EAGAIN)
31 return(IRQ_NONE);
33 xterm->new_fd = fd;
34 complete(&xterm->ready);
35 return(IRQ_HANDLED);
38 int xterm_fd(int socket, int *pid_out)
40 struct xterm_wait *data;
41 int err, ret;
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);
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);
56 err = um_request_irq(XTERM_IRQ, socket, IRQ_READ, xterm_interrupt,
57 SA_INTERRUPT | SA_SHIRQ | SA_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;
66 /* ... so here we wait for an xterm interrupt.
68 * XXX Note, if the xterm doesn't work for some reason (eg. DISPLAY
69 * isn't set) this will hang... */
70 wait_for_completion(&data->ready);
72 free_irq(XTERM_IRQ, data);
74 ret = data->new_fd;
75 *pid_out = data->pid;
76 out:
77 kfree(data);
79 return(ret);
83 * Overrides for Emacs so that we follow Linus's tabbing style.
84 * Emacs will notice this stuff at the end of the file and automatically
85 * adjust the settings for this buffer only. This must remain at the end
86 * of the file.
87 * ---------------------------------------------------------------------------
88 * Local variables:
89 * c-file-style: "linux"
90 * End: