gjgjh code example

Example 1: gjgjh

void memcpy_fromfs(void *to, const void *from, unsigned long count);
 void memcpy_tofs(void *to, const void *from, unsigned long count);

Example 2: gjgjh

#ifdef LINUX_20
# ifdef MUTEX_LOCKED /* Only if semaphore.h included */
  extern inline void sema_init (struct semaphore *sem, int val)
  {
   sem->count = val;
   sem->waking = sem->lock = 0;
   sem->wait = NULL;
  }
# endif
#endif /* LINUX_20 */

Example 3: gjgjh

#include <devfs_fs_kernel.h>

 int init_module()
 {
  /* request a major: does nothing if devfs is used */
  result = devfs_register_chrdev(major, "name", &fops);
  if (result < 0) return result;

  /* register using devfs: does nothing if not in use */
  devfs_register(NULL, "name", /* .... */ );
  return 0;
 }

Example 4: gjgjh

/*
 * The following wrappers are meant to make things work with 2.0 kernels
 */
#ifdef LINUX_20
int scull_lseek_20(struct inode *ino, struct file *f,
    off_t offset, int whence)
{
 return (int)scull_llseek(f, offset, whence);
}

int scull_read_20(struct inode *ino, struct file *f, char *buf, 
   int count)
{
 return (int)scull_read(f, buf, count, &f->f_pos);
}

int scull_write_20(struct inode *ino, struct file *f, const char *b, 
   int c)
{
 return (int)scull_write(f, b, c, &f->f_pos);
}

void scull_release_20(struct inode *ino, struct file *f)
{
 scull_release(ino, f);
}

/* Redefine "real" names to the 2.0 ones */
#define scull_llseek scull_lseek_20
#define scull_read scull_read_20
#define scull_write scull_write_20
#define scull_release scull_release_20
#define llseek lseek
#endif /* LINUX_20 */

Example 5: gjgjh

crw-rw-rw- 1 root  root  144,  1 Jan 1 1970 0
crw-rw-rw- 1 root  root  144,  2 Jan 1 1970 1
crw-rw-rw- 1 root  root  144,  3 Jan 1 1970 2
crw-rw-rw- 1 root  root  144,  4 Jan 1 1970 3
crw-rw-rw- 1 root  root  144,  5 Jan 1 1970 pipe0
crw-rw-rw- 1 root  root  144,  6 Jan 1 1970 pipe1
crw-rw-rw- 1 root  root  144,  7 Jan 1 1970 pipe2
crw-rw-rw- 1 root  root  144,  8 Jan 1 1970 pipe3
crw-rw-rw- 1 root  root  144, 12 Jan 1 1970 priv
crw-rw-rw- 1 root  root  144,  9 Jan 1 1970 single
crw-rw-rw- 1 root  root  144, 10 Jan 1 1970 user
crw-rw-rw- 1 root  root  144, 11 Jan 1 1970 wuser

Example 6: gjgjh

#ifdef LINUX_20
# define INODE_FROM_F(filp) ((filp)->f_inode)
#else
# define INODE_FROM_F(filp) ((filp)->f_dentry->d_inode)
#endif

Example 7: gjgjh

/*
  * If private data is not valid, we are not using devfs
  * so use the type (from minor nr.) to select a new f_op
  */
 if (!filp->private_data && type) {
  if (type > SCULL_MAX_TYPE) return -ENODEV;
  filp->f_op = scull_fop_array[type];
  return filp->f_op->open(inode, filp); /* dispatch to specific open */
 }

 /* type 0, check the device number (unless private_data valid) */
 dev = (Scull_Dev *)filp->private_data;
 if (!dev) {
  if (num >= scull_nr_devs) return -ENODEV;
  dev = &scull_devices[num];
  filp->private_data = dev; /* for other methods */
 }

Example 8: gjgjh

#include <linux/devfs_fs_kernel.h>

devfs_handle_t devfs_mk_dir (devfs_handle_t dir,
  const char *name, void *info);

devfs_handle_t devfs_register (devfs_handle_t dir,
  const char *name, unsigned int flags,
  unsigned int major, unsigned int minor,
  umode_t mode, void *ops, void *info);

  void devfs_unregister (devfs_handle_t de);

Example 9: gjgjh

struct iovec
 {
  void *iov_base;
  _ _kernel_size_t iov_len;
 };

Example 10: gjgjh

ssize_t (*readv) (struct file *filp, const struct iovec *iov, 
      unsigned long count, loff_t *ppos);
 ssize_t (*writev) (struct file *filp, const struct iovec *iov, 
      unsigned long count, loff_t *ppos);