| /* |
| * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) |
| * Licensed under the GPL |
| */ |
| |
| #include "linux/errno.h" |
| #include "linux/slab.h" |
| #include "asm/semaphore.h" |
| #include "asm/irq.h" |
| #include "irq_user.h" |
| #include "kern_util.h" |
| #include "os.h" |
| #include "xterm.h" |
| |
| struct xterm_wait { |
| struct semaphore sem; |
| int fd; |
| int pid; |
| int new_fd; |
| }; |
| |
| static void xterm_interrupt(int irq, void *data, struct pt_regs *regs) |
| { |
| struct xterm_wait *xterm = data; |
| int fd; |
| |
| fd = os_rcv_fd(xterm->fd, &xterm->pid); |
| if(fd == -EAGAIN) |
| return; |
| |
| xterm->new_fd = fd; |
| up(&xterm->sem); |
| } |
| |
| int xterm_fd(int socket, int *pid_out) |
| { |
| struct xterm_wait *data; |
| int err, ret; |
| |
| data = kmalloc(sizeof(*data), GFP_KERNEL); |
| if(data == NULL){ |
| printk(KERN_ERR "xterm_fd - failed to allocate semaphore\n"); |
| return(-ENOMEM); |
| } |
| *data = ((struct xterm_wait) |
| { sem : __SEMAPHORE_INITIALIZER(data->sem, 0), |
| fd : socket, |
| pid : -1, |
| new_fd : -1 }); |
| |
| err = um_request_irq(XTERM_IRQ, socket, IRQ_READ, xterm_interrupt, |
| SA_INTERRUPT | SA_SHIRQ | SA_SAMPLE_RANDOM, |
| "xterm", data); |
| if(err){ |
| printk(KERN_ERR "Failed to get IRQ for xterm, err = %d\n", |
| err); |
| return(err); |
| } |
| down(&data->sem); |
| |
| free_irq(XTERM_IRQ, data); |
| |
| ret = data->new_fd; |
| *pid_out = data->pid; |
| kfree(data); |
| |
| return(ret); |
| } |
| |
| /* |
| * Overrides for Emacs so that we follow Linus's tabbing style. |
| * Emacs will notice this stuff at the end of the file and automatically |
| * adjust the settings for this buffer only. This must remain at the end |
| * of the file. |
| * --------------------------------------------------------------------------- |
| * Local variables: |
| * c-file-style: "linux" |
| * End: |
| */ |