/* * 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_SHARED, "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); um_free_irq(XTERM_IRQ, data); ret = data->new_fd; *pid_out = data->pid; out: kfree(data); return ret; }