11da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 263920f4717924206c3fa23d42645d4f8965de4cdJeff Dike * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) 31da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Licensed under the GPL 41da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 51da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 663920f4717924206c3fa23d42645d4f8965de4cdJeff Dike#include <linux/slab.h> 763920f4717924206c3fa23d42645d4f8965de4cdJeff Dike#include <linux/completion.h> 863920f4717924206c3fa23d42645d4f8965de4cdJeff Dike#include <linux/irqreturn.h> 963920f4717924206c3fa23d42645d4f8965de4cdJeff Dike#include <asm/irq.h> 1037185b33240870719b6b5913a46e6a441f1ae96fAl Viro#include <irq_kern.h> 1137185b33240870719b6b5913a46e6a441f1ae96fAl Viro#include <os.h> 121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstruct xterm_wait { 141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct completion ready; 151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int fd; 161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int pid; 171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int new_fd; 181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 207bea96fd22a8fd19f90817405b4abe032317a0e3Al Virostatic irqreturn_t xterm_interrupt(int irq, void *data) 211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct xterm_wait *xterm = data; 231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int fd; 241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds fd = os_rcv_fd(xterm->fd, &xterm->pid); 2663920f4717924206c3fa23d42645d4f8965de4cdJeff Dike if (fd == -EAGAIN) 2763920f4717924206c3fa23d42645d4f8965de4cdJeff Dike return IRQ_NONE; 281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xterm->new_fd = fd; 301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds complete(&xterm->ready); 3163920f4717924206c3fa23d42645d4f8965de4cdJeff Dike 3263920f4717924206c3fa23d42645d4f8965de4cdJeff Dike return IRQ_HANDLED; 331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsint xterm_fd(int socket, int *pid_out) 361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct xterm_wait *data; 381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int err, ret; 391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds data = kmalloc(sizeof(*data), GFP_KERNEL); 4163920f4717924206c3fa23d42645d4f8965de4cdJeff Dike if (data == NULL) { 421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_ERR "xterm_fd : failed to allocate xterm_wait\n"); 4363920f4717924206c3fa23d42645d4f8965de4cdJeff Dike return -ENOMEM; 441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* This is a locked semaphore... */ 4763920f4717924206c3fa23d42645d4f8965de4cdJeff Dike *data = ((struct xterm_wait) { .fd = socket, 4863920f4717924206c3fa23d42645d4f8965de4cdJeff Dike .pid = -1, 4963920f4717924206c3fa23d42645d4f8965de4cdJeff Dike .new_fd = -1 }); 501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds init_completion(&data->ready); 511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5263920f4717924206c3fa23d42645d4f8965de4cdJeff Dike err = um_request_irq(XTERM_IRQ, socket, IRQ_READ, xterm_interrupt, 53aab944606f9490f158d3b28f6c44a33c4701a5b3Theodore Ts'o IRQF_SHARED, "xterm", data); 5463920f4717924206c3fa23d42645d4f8965de4cdJeff Dike if (err) { 551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_ERR "xterm_fd : failed to get IRQ for xterm, " 561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "err = %d\n", err); 571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = err; 581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out; 591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* ... so here we wait for an xterm interrupt. 621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * XXX Note, if the xterm doesn't work for some reason (eg. DISPLAY 641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * isn't set) this will hang... */ 651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds wait_for_completion(&data->ready); 661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 67fa7a0449e0ea6588f64c06a045ea8728280f3457Richard Weinberger um_free_irq(XTERM_IRQ, data); 681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = data->new_fd; 701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *pid_out = data->pid; 711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds out: 721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kfree(data); 731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7463920f4717924206c3fa23d42645d4f8965de4cdJeff Dike return ret; 751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 76