5cde6096a4
Change os_rcv_fd() to os_rcv_fd_msg() that can more generally receive any number of FDs in any kind of message. Link: https://patch.msgid.link/20240702192118.40b78b2bfe4e.Ic6ec12d72630e5bcae1e597d6bd5c6f29f441563@changeid Signed-off-by: Johannes Berg <johannes.berg@intel.com>
84 lines
1.7 KiB
C
84 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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*/
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#include <linux/slab.h>
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#include <linux/completion.h>
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#include <linux/irqreturn.h>
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#include <asm/irq.h>
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#include <irq_kern.h>
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#include <os.h>
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#include "xterm.h"
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struct xterm_wait {
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struct completion ready;
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int fd;
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int pid;
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int new_fd;
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};
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static irqreturn_t xterm_interrupt(int irq, void *data)
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{
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struct xterm_wait *xterm = data;
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int fd = -1, n_fds = 1;
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ssize_t ret;
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ret = os_rcv_fd_msg(xterm->fd, &fd, n_fds,
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&xterm->pid, sizeof(xterm->pid));
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if (ret == -EAGAIN)
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return IRQ_NONE;
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if (ret < 0)
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fd = ret;
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else if (ret != sizeof(xterm->pid))
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fd = -EMSGSIZE;
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xterm->new_fd = fd;
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complete(&xterm->ready);
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return IRQ_HANDLED;
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}
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int xterm_fd(int socket, int *pid_out)
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{
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struct xterm_wait *data;
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int err, ret;
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data = kmalloc(sizeof(*data), GFP_KERNEL);
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if (data == NULL) {
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printk(KERN_ERR "xterm_fd : failed to allocate xterm_wait\n");
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return -ENOMEM;
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}
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/* This is a locked semaphore... */
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*data = ((struct xterm_wait) { .fd = socket,
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.pid = -1,
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.new_fd = -1 });
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init_completion(&data->ready);
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err = um_request_irq(XTERM_IRQ, socket, IRQ_READ, xterm_interrupt,
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IRQF_SHARED, "xterm", data);
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if (err < 0) {
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printk(KERN_ERR "xterm_fd : failed to get IRQ for xterm, "
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"err = %d\n", err);
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ret = err;
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goto out;
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}
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/* ... so here we wait for an xterm interrupt.
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*
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* XXX Note, if the xterm doesn't work for some reason (eg. DISPLAY
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* isn't set) this will hang... */
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wait_for_completion(&data->ready);
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um_free_irq(XTERM_IRQ, data);
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ret = data->new_fd;
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*pid_out = data->pid;
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out:
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kfree(data);
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return ret;
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}
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