aab944606f
With the changes in the random tree, IRQF_SAMPLE_RANDOM is now a
no-op; interrupt randomness is now collected unconditionally in a very
low-overhead fashion; see commit 775f4b297b. The IRQF_SAMPLE_RANDOM
flag was scheduled to be removed in 2009 on the
feature-removal-schedule, so this patch is preparation for the final
removal of this flag.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Richard Weinberger <richard@nod.at>
75 lines
1.5 KiB
C
75 lines
1.5 KiB
C
/*
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* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Licensed under the GPL
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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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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;
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fd = os_rcv_fd(xterm->fd, &xterm->pid);
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if (fd == -EAGAIN)
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return IRQ_NONE;
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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) {
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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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