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https://github.com/torvalds/linux.git
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94 lines
2.0 KiB
C
94 lines
2.0 KiB
C
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/*
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* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#include "linux/errno.h"
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#include "linux/slab.h"
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#include "linux/signal.h"
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#include "linux/interrupt.h"
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#include "asm/semaphore.h"
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#include "asm/irq.h"
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#include "irq_user.h"
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#include "irq_kern.h"
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#include "kern_util.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, struct pt_regs *regs)
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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)
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{ .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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SA_INTERRUPT | SA_SHIRQ | SA_SAMPLE_RANDOM,
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"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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free_irq_by_irq_and_dev(XTERM_IRQ, data);
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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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/*
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* Overrides for Emacs so that we follow Linus's tabbing style.
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* Emacs will notice this stuff at the end of the file and automatically
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* adjust the settings for this buffer only. This must remain at the end
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* of the file.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-file-style: "linux"
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* End:
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*/
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