diff options
Diffstat (limited to 'drivers/sgi/char/usema.c')
| -rw-r--r-- | drivers/sgi/char/usema.c | 191 |
1 files changed, 0 insertions, 191 deletions
diff --git a/drivers/sgi/char/usema.c b/drivers/sgi/char/usema.c index 262f5724f..dfef772eb 100644 --- a/drivers/sgi/char/usema.c +++ b/drivers/sgi/char/usema.c @@ -27,197 +27,6 @@ #include <linux/sched.h> #include <linux/file.h> #include <linux/major.h> -#include <linux/string.h> -#include <linux/dcache.h> -#include <linux/mm.h> -#include <linux/slab.h> - -#include <asm/smp_lock.h> -#include <asm/usioctl.h> -#include <asm/mman.h> -#include <asm/uaccess.h> - -struct irix_usema { - struct file *filp; - struct wait_queue *proc_list; -}; - -static int -sgi_usema_attach (usattach_t * attach, struct irix_usema *usema) -{ - int newfd; - newfd = get_unused_fd(); - if (newfd < 0) - return newfd; - - current->files->fd [newfd] = usema->filp; - usema->filp->f_count++; - /* Is that it? */ - printk("UIOCATTACHSEMA: new usema fd is %d", newfd); - return newfd; -} - -static int -sgi_usemaclone_ioctl(struct inode *inode, struct file *file, unsigned int cmd, - unsigned long arg) -{ - struct irix_usema *usema = file->private_data; - int retval; - - printk("[%s:%d] wants ioctl 0x%xd (arg 0x%lx)", - current->comm, current->pid, cmd, arg); - - switch(cmd) { - case UIOCATTACHSEMA: { - /* They pass us information about the semaphore to - which they wish to be attached, and we create&return - a new fd corresponding to the appropriate semaphore. - */ - usattach_t *attach = (usattach_t *)arg; - retval = verify_area(VERIFY_READ, attach, sizeof(usattach_t)); - if (retval) { - printk("[%s:%d] sgi_usema_ioctl(UIOCATTACHSEMA): " - "verify_area failure", - current->comm, current->pid); - return retval; - } - if (usema == 0) - return -EINVAL; - - printk("UIOCATTACHSEMA: attaching usema %p to process %d\n", usema, current->pid); - /* XXX what is attach->us_handle for? */ - return sgi_usema_attach(attach, usema); - break; - } - case UIOCABLOCK: /* XXX make `async' */ - case UIOCNOIBLOCK: /* XXX maybe? */ - case UIOCBLOCK: { - /* Block this process on the semaphore */ - usattach_t *attach = (usattach_t *)arg; - - retval = verify_area(VERIFY_READ, attach, sizeof(usattach_t)); - if (retval) { - printk("[%s:%d] sgi_usema_ioctl(UIOC*BLOCK): " - "verify_area failure", - current->comm, current->pid); - return retval; - } - printk("UIOC*BLOCK: putting process %d to sleep on usema %p", - current->pid, usema); - if (cmd == UIOCNOIBLOCK) - interruptible_sleep_on(&usema->proc_list); - else - sleep_on(&usema->proc_list); - return 0; - } - case UIOCAUNBLOCK: /* XXX make `async' */ - case UIOCUNBLOCK: { - /* Wake up all process waiting on this semaphore */ - usattach_t *attach = (usattach_t *)arg; - - retval = verify_area(VERIFY_READ, attach, sizeof(usattach_t)); - if (retval) { - printk("[%s:%d] sgi_usema_ioctl(UIOC*BLOCK): " - "verify_area failure", - current->comm, current->pid); - return retval; - } - - printk("[%s:%d] releasing usema %p", - current->comm, current->pid, usema); - wake_up(&usema->proc_list); - return 0; - } - } - return -ENOSYS; -} - -static unsigned int -sgi_usemaclone_poll(struct file *filp, poll_table *wait) -{ - struct irix_usema *usema = filp->private_data; - - printk("[%s:%d] wants to poll usema %p", current->comm, current->pid, usema); - - return 0; -} - -static int -sgi_usemaclone_open(struct inode *inode, struct file *filp) -{ - struct irix_usema *usema; - - usema = kmalloc (sizeof (struct irix_usema), GFP_KERNEL); - if (!usema) - return -ENOMEM; - - usema->filp = filp; - usema->proc_list = NULL; - filp->private_data = usema; - return 0; -} - -static int -sgi_usemaclone_release(struct inode *inode, struct file *filp) -{ - return 0; -} - -struct file_operations sgi_usemaclone_fops = { - NULL, /* llseek */ - NULL, /* read */ - NULL, /* write */ - NULL, /* readdir */ - sgi_usemaclone_poll, /* poll */ - sgi_usemaclone_ioctl, /* ioctl */ - NULL, /* mmap */ - sgi_usemaclone_open, /* open */ - sgi_usemaclone_release, /* release */ - NULL, /* fsync */ - NULL, /* check_media_change */ - NULL, /* revalidate */ - NULL /* lock */ -}; - -static struct miscdevice dev_usemaclone = { - SGI_USEMACLONE, "usemaclone", &sgi_usemaclone_fops -}; - -void -usema_init(void) -{ - printk("usemaclone misc device registered (minor: %d)\n", SGI_USEMACLONE); - misc_register(&dev_usemaclone); -} -/* - * usema.c: software semaphore driver (see IRIX's usema(7M)) - * written 1997 Mike Shaver (shaver@neon.ingenia.ca) - * 1997 Miguel de Icaza (miguel@kernel.org) - * - * This file contains the implementation of /dev/usemaclone, - * the devices used by IRIX's us* semaphore routines. - * - * /dev/usemaclone is used to create a new semaphore device, and then - * the semaphore is manipulated via ioctls. - * - * At least for the zero-contention case, lock set and unset as well - * as semaphore P and V are done in userland, which makes things a - * little bit better. I suspect that the ioctls are used to register - * the process as blocking, etc. - * - * Much inspiration and structure stolen from Miguel's shmiq work. - * - * For more information: - * usema(7m), usinit(3p), usnewsema(3p) - * /usr/include/sys/usioctl.h - * -*/ - -#include <linux/fs.h> -#include <linux/miscdevice.h> -#include <linux/sched.h> -#include <linux/file.h> -#include <linux/major.h> #include <linux/poll.h> #include <linux/string.h> #include <linux/dcache.h> |