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