1*1da177e4SLinus Torvalds /* 2*1da177e4SLinus Torvalds * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) 3*1da177e4SLinus Torvalds * Licensed under the GPL 4*1da177e4SLinus Torvalds */ 5*1da177e4SLinus Torvalds 6*1da177e4SLinus Torvalds #include "linux/errno.h" 7*1da177e4SLinus Torvalds #include "linux/slab.h" 8*1da177e4SLinus Torvalds #include "linux/signal.h" 9*1da177e4SLinus Torvalds #include "linux/interrupt.h" 10*1da177e4SLinus Torvalds #include "asm/semaphore.h" 11*1da177e4SLinus Torvalds #include "asm/irq.h" 12*1da177e4SLinus Torvalds #include "irq_user.h" 13*1da177e4SLinus Torvalds #include "irq_kern.h" 14*1da177e4SLinus Torvalds #include "kern_util.h" 15*1da177e4SLinus Torvalds #include "os.h" 16*1da177e4SLinus Torvalds #include "xterm.h" 17*1da177e4SLinus Torvalds 18*1da177e4SLinus Torvalds struct xterm_wait { 19*1da177e4SLinus Torvalds struct completion ready; 20*1da177e4SLinus Torvalds int fd; 21*1da177e4SLinus Torvalds int pid; 22*1da177e4SLinus Torvalds int new_fd; 23*1da177e4SLinus Torvalds }; 24*1da177e4SLinus Torvalds 25*1da177e4SLinus Torvalds static irqreturn_t xterm_interrupt(int irq, void *data, struct pt_regs *regs) 26*1da177e4SLinus Torvalds { 27*1da177e4SLinus Torvalds struct xterm_wait *xterm = data; 28*1da177e4SLinus Torvalds int fd; 29*1da177e4SLinus Torvalds 30*1da177e4SLinus Torvalds fd = os_rcv_fd(xterm->fd, &xterm->pid); 31*1da177e4SLinus Torvalds if(fd == -EAGAIN) 32*1da177e4SLinus Torvalds return(IRQ_NONE); 33*1da177e4SLinus Torvalds 34*1da177e4SLinus Torvalds xterm->new_fd = fd; 35*1da177e4SLinus Torvalds complete(&xterm->ready); 36*1da177e4SLinus Torvalds return(IRQ_HANDLED); 37*1da177e4SLinus Torvalds } 38*1da177e4SLinus Torvalds 39*1da177e4SLinus Torvalds int xterm_fd(int socket, int *pid_out) 40*1da177e4SLinus Torvalds { 41*1da177e4SLinus Torvalds struct xterm_wait *data; 42*1da177e4SLinus Torvalds int err, ret; 43*1da177e4SLinus Torvalds 44*1da177e4SLinus Torvalds data = kmalloc(sizeof(*data), GFP_KERNEL); 45*1da177e4SLinus Torvalds if(data == NULL){ 46*1da177e4SLinus Torvalds printk(KERN_ERR "xterm_fd : failed to allocate xterm_wait\n"); 47*1da177e4SLinus Torvalds return(-ENOMEM); 48*1da177e4SLinus Torvalds } 49*1da177e4SLinus Torvalds 50*1da177e4SLinus Torvalds /* This is a locked semaphore... */ 51*1da177e4SLinus Torvalds *data = ((struct xterm_wait) 52*1da177e4SLinus Torvalds { .fd = socket, 53*1da177e4SLinus Torvalds .pid = -1, 54*1da177e4SLinus Torvalds .new_fd = -1 }); 55*1da177e4SLinus Torvalds init_completion(&data->ready); 56*1da177e4SLinus Torvalds 57*1da177e4SLinus Torvalds err = um_request_irq(XTERM_IRQ, socket, IRQ_READ, xterm_interrupt, 58*1da177e4SLinus Torvalds SA_INTERRUPT | SA_SHIRQ | SA_SAMPLE_RANDOM, 59*1da177e4SLinus Torvalds "xterm", data); 60*1da177e4SLinus Torvalds if (err){ 61*1da177e4SLinus Torvalds printk(KERN_ERR "xterm_fd : failed to get IRQ for xterm, " 62*1da177e4SLinus Torvalds "err = %d\n", err); 63*1da177e4SLinus Torvalds ret = err; 64*1da177e4SLinus Torvalds goto out; 65*1da177e4SLinus Torvalds } 66*1da177e4SLinus Torvalds 67*1da177e4SLinus Torvalds /* ... so here we wait for an xterm interrupt. 68*1da177e4SLinus Torvalds * 69*1da177e4SLinus Torvalds * XXX Note, if the xterm doesn't work for some reason (eg. DISPLAY 70*1da177e4SLinus Torvalds * isn't set) this will hang... */ 71*1da177e4SLinus Torvalds wait_for_completion(&data->ready); 72*1da177e4SLinus Torvalds 73*1da177e4SLinus Torvalds free_irq_by_irq_and_dev(XTERM_IRQ, data); 74*1da177e4SLinus Torvalds free_irq(XTERM_IRQ, data); 75*1da177e4SLinus Torvalds 76*1da177e4SLinus Torvalds ret = data->new_fd; 77*1da177e4SLinus Torvalds *pid_out = data->pid; 78*1da177e4SLinus Torvalds out: 79*1da177e4SLinus Torvalds kfree(data); 80*1da177e4SLinus Torvalds 81*1da177e4SLinus Torvalds return(ret); 82*1da177e4SLinus Torvalds } 83*1da177e4SLinus Torvalds 84*1da177e4SLinus Torvalds /* 85*1da177e4SLinus Torvalds * Overrides for Emacs so that we follow Linus's tabbing style. 86*1da177e4SLinus Torvalds * Emacs will notice this stuff at the end of the file and automatically 87*1da177e4SLinus Torvalds * adjust the settings for this buffer only. This must remain at the end 88*1da177e4SLinus Torvalds * of the file. 89*1da177e4SLinus Torvalds * --------------------------------------------------------------------------- 90*1da177e4SLinus Torvalds * Local variables: 91*1da177e4SLinus Torvalds * c-file-style: "linux" 92*1da177e4SLinus Torvalds * End: 93*1da177e4SLinus Torvalds */ 94