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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
*/
#include <linux/slab.h>
#include <linux/completion.h>
#include <linux/irqreturn.h>
#include <asm/irq.h>
#include <irq_kern.h>
#include <os.h>
#include "xterm.h"
struct xterm_wait {
struct completion ready;
int fd;
int pid;
int new_fd;
};
static irqreturn_t xterm_interrupt(int irq, void *data)
{
struct xterm_wait *xterm = data;
int fd = -1, n_fds = 1;
ssize_t ret;
ret = os_rcv_fd_msg(xterm->fd, &fd, n_fds,
&xterm->pid, sizeof(xterm->pid));
if (ret == -EAGAIN)
return IRQ_NONE;
if (ret < 0)
fd = ret;
else if (ret != sizeof(xterm->pid))
fd = -EMSGSIZE;
xterm->new_fd = fd;
complete(&xterm->ready);
return IRQ_HANDLED;
}
int xterm_fd(int socket, int *pid_out)
{
struct xterm_wait *data;
int err, ret;
data = kmalloc(sizeof(*data), GFP_KERNEL);
if (data == NULL) {
printk(KERN_ERR "xterm_fd : failed to allocate xterm_wait\n");
return -ENOMEM;
}
/* This is a locked semaphore... */
*data = ((struct xterm_wait) { .fd = socket,
.pid = -1,
.new_fd = -1 });
init_completion(&data->ready);
err = um_request_irq(XTERM_IRQ, socket, IRQ_READ, xterm_interrupt,
IRQF_SHARED, "xterm", data);
if (err < 0) {
printk(KERN_ERR "xterm_fd : failed to get IRQ for xterm, "
"err = %d\n", err);
ret = err;
goto out;
}
/* ... so here we wait for an xterm interrupt.
*
* XXX Note, if the xterm doesn't work for some reason (eg. DISPLAY
* isn't set) this will hang... */
wait_for_completion(&data->ready);
um_free_irq(XTERM_IRQ, data);
ret = data->new_fd;
*pid_out = data->pid;
out:
kfree(data);
return ret;
}
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