1// SPDX-License-Identifier: GPL-2.0
 2/* 
 3 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 4 */
 5
 6#include <linux/slab.h>
 7#include <linux/completion.h>
 8#include <linux/irqreturn.h>
 9#include <asm/irq.h>
10#include <irq_kern.h>
11#include <os.h>
12#include "xterm.h"
13
14struct xterm_wait {
15	struct completion ready;
16	int fd;
17	int pid;
18	int new_fd;
19};
20
21static irqreturn_t xterm_interrupt(int irq, void *data)
22{
23	struct xterm_wait *xterm = data;
24	int fd = -1, n_fds = 1;
25	ssize_t ret;
26
27	ret = os_rcv_fd_msg(xterm->fd, &fd, n_fds,
28			    &xterm->pid, sizeof(xterm->pid));
29	if (ret == -EAGAIN)
30		return IRQ_NONE;
31
32	if (ret < 0)
33		fd = ret;
34	else if (ret != sizeof(xterm->pid))
35		fd = -EMSGSIZE;
36
37	xterm->new_fd = fd;
38	complete(&xterm->ready);
39
40	return IRQ_HANDLED;
41}
42
43int xterm_fd(int socket, int *pid_out)
44{
45	struct xterm_wait *data;
46	int err, ret;
47
48	data = kmalloc(sizeof(*data), GFP_KERNEL);
49	if (data == NULL) {
50		printk(KERN_ERR "xterm_fd : failed to allocate xterm_wait\n");
51		return -ENOMEM;
52	}
53
54	/* This is a locked semaphore... */
55	*data = ((struct xterm_wait) { .fd 		= socket,
56				       .pid 		= -1,
57				       .new_fd	 	= -1 });
58	init_completion(&data->ready);
59
60	err = um_request_irq(XTERM_IRQ, socket, IRQ_READ, xterm_interrupt,
61			     IRQF_SHARED, "xterm", data);
62	if (err < 0) {
63		printk(KERN_ERR "xterm_fd : failed to get IRQ for xterm, "
64		       "err = %d\n",  err);
65		ret = err;
66		goto out;
67	}
68
69	/* ... so here we wait for an xterm interrupt.
70	 *
71	 * XXX Note, if the xterm doesn't work for some reason (eg. DISPLAY
72	 * isn't set) this will hang... */
73	wait_for_completion(&data->ready);
74
75	um_free_irq(XTERM_IRQ, data);
76
77	ret = data->new_fd;
78	*pid_out = data->pid;
79 out:
80	kfree(data);
81
82	return ret;
83}

 1// SPDX-License-Identifier: GPL-2.0
 2/* 
 3 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 4 */
 5
 6#include <linux/slab.h>
 7#include <linux/completion.h>
 8#include <linux/irqreturn.h>
 9#include <asm/irq.h>
10#include <irq_kern.h>
11#include <os.h>
 
12
13struct xterm_wait {
14	struct completion ready;
15	int fd;
16	int pid;
17	int new_fd;
18};
19
20static irqreturn_t xterm_interrupt(int irq, void *data)
21{
22	struct xterm_wait *xterm = data;
23	int fd;
 
24
25	fd = os_rcv_fd(xterm->fd, &xterm->pid);
26	if (fd == -EAGAIN)
 
27		return IRQ_NONE;
 
 
 
 
 
28
29	xterm->new_fd = fd;
30	complete(&xterm->ready);
31
32	return IRQ_HANDLED;
33}
34
35int 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);
41	if (data == NULL) {
42		printk(KERN_ERR "xterm_fd : failed to allocate xterm_wait\n");
43		return -ENOMEM;
44	}
45
46	/* This is a locked semaphore... */
47	*data = ((struct xterm_wait) { .fd 		= socket,
48				       .pid 		= -1,
49				       .new_fd	 	= -1 });
50	init_completion(&data->ready);
51
52	err = um_request_irq(XTERM_IRQ, socket, IRQ_READ, xterm_interrupt,
53			     IRQF_SHARED, "xterm", data);
54	if (err < 0) {
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
67	um_free_irq(XTERM_IRQ, data);
68
69	ret = data->new_fd;
70	*pid_out = data->pid;
71 out:
72	kfree(data);
73
74	return ret;
75}