11da177e4SLinus Torvalds /* 263920f47SJeff Dike * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) 31da177e4SLinus Torvalds * Licensed under the GPL 41da177e4SLinus Torvalds */ 51da177e4SLinus Torvalds 663920f47SJeff Dike #include <linux/slab.h> 763920f47SJeff Dike #include <linux/completion.h> 863920f47SJeff Dike #include <linux/irqreturn.h> 963920f47SJeff Dike #include <asm/irq.h> 101da177e4SLinus Torvalds #include "irq_kern.h" 111da177e4SLinus Torvalds #include "os.h" 121da177e4SLinus Torvalds 131da177e4SLinus Torvalds struct xterm_wait { 141da177e4SLinus Torvalds struct completion ready; 151da177e4SLinus Torvalds int fd; 161da177e4SLinus Torvalds int pid; 171da177e4SLinus Torvalds int new_fd; 181da177e4SLinus Torvalds }; 191da177e4SLinus Torvalds 207bea96fdSAl Viro static irqreturn_t xterm_interrupt(int irq, void *data) 211da177e4SLinus Torvalds { 221da177e4SLinus Torvalds struct xterm_wait *xterm = data; 231da177e4SLinus Torvalds int fd; 241da177e4SLinus Torvalds 251da177e4SLinus Torvalds fd = os_rcv_fd(xterm->fd, &xterm->pid); 261da177e4SLinus Torvalds if (fd == -EAGAIN) 2763920f47SJeff Dike return IRQ_NONE; 281da177e4SLinus Torvalds 291da177e4SLinus Torvalds xterm->new_fd = fd; 301da177e4SLinus Torvalds complete(&xterm->ready); 3163920f47SJeff Dike 3263920f47SJeff Dike return IRQ_HANDLED; 331da177e4SLinus Torvalds } 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds int xterm_fd(int socket, int *pid_out) 361da177e4SLinus Torvalds { 371da177e4SLinus Torvalds struct xterm_wait *data; 381da177e4SLinus Torvalds int err, ret; 391da177e4SLinus Torvalds 401da177e4SLinus Torvalds data = kmalloc(sizeof(*data), GFP_KERNEL); 411da177e4SLinus Torvalds if (data == NULL) { 421da177e4SLinus Torvalds printk(KERN_ERR "xterm_fd : failed to allocate xterm_wait\n"); 4363920f47SJeff Dike return -ENOMEM; 441da177e4SLinus Torvalds } 451da177e4SLinus Torvalds 461da177e4SLinus Torvalds /* This is a locked semaphore... */ 4763920f47SJeff Dike *data = ((struct xterm_wait) { .fd = socket, 481da177e4SLinus Torvalds .pid = -1, 491da177e4SLinus Torvalds .new_fd = -1 }); 501da177e4SLinus Torvalds init_completion(&data->ready); 511da177e4SLinus Torvalds 521da177e4SLinus Torvalds err = um_request_irq(XTERM_IRQ, socket, IRQ_READ, xterm_interrupt, 53c0b79a90SYong Zhang IRQF_SHARED | IRQF_SAMPLE_RANDOM, 541da177e4SLinus Torvalds "xterm", data); 551da177e4SLinus Torvalds if (err) { 561da177e4SLinus Torvalds printk(KERN_ERR "xterm_fd : failed to get IRQ for xterm, " 571da177e4SLinus Torvalds "err = %d\n", err); 581da177e4SLinus Torvalds ret = err; 591da177e4SLinus Torvalds goto out; 601da177e4SLinus Torvalds } 611da177e4SLinus Torvalds 621da177e4SLinus Torvalds /* ... so here we wait for an xterm interrupt. 631da177e4SLinus Torvalds * 641da177e4SLinus Torvalds * XXX Note, if the xterm doesn't work for some reason (eg. DISPLAY 651da177e4SLinus Torvalds * isn't set) this will hang... */ 661da177e4SLinus Torvalds wait_for_completion(&data->ready); 671da177e4SLinus Torvalds 68*fa7a0449SRichard Weinberger um_free_irq(XTERM_IRQ, data); 691da177e4SLinus Torvalds 701da177e4SLinus Torvalds ret = data->new_fd; 711da177e4SLinus Torvalds *pid_out = data->pid; 721da177e4SLinus Torvalds out: 731da177e4SLinus Torvalds kfree(data); 741da177e4SLinus Torvalds 7563920f47SJeff Dike return ret; 761da177e4SLinus Torvalds } 77