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 17struct xterm_wait { 18 struct completion ready; 19 int fd; 20 int pid; 21 int new_fd; 22}; 23 24static irqreturn_t xterm_interrupt(int irq, void *data) 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 38int 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 IRQF_DISABLED | IRQF_SHARED | IRQF_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 wait_for_completion(&data->ready); 67 68 free_irq(XTERM_IRQ, data); 69 70 ret = data->new_fd; 71 *pid_out = data->pid; 72 out: 73 kfree(data); 74 75 return(ret); 76} 77 78/* 79 * Overrides for Emacs so that we follow Linus's tabbing style. 80 * Emacs will notice this stuff at the end of the file and automatically 81 * adjust the settings for this buffer only. This must remain at the end 82 * of the file. 83 * --------------------------------------------------------------------------- 84 * Local variables: 85 * c-file-style: "linux" 86 * End: 87 */ 88