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xterm_kern.c

/* 
 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Licensed under the GPL
 */

#include <linux/slab.h>
#include <linux/completion.h>
#include <linux/irqreturn.h>
#include <asm/irq.h>
#include "irq_kern.h"
#include "os.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;

      fd = os_rcv_fd(xterm->fd, &xterm->pid);
      if (fd == -EAGAIN)
            return IRQ_NONE;

      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_DISABLED | IRQF_SHARED | IRQF_SAMPLE_RANDOM,
                       "xterm", data);
      if (err) {
            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);

      free_irq(XTERM_IRQ, data);

      ret = data->new_fd;
      *pid_out = data->pid;
 out:
      kfree(data);

      return ret;
}

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