ndk/platforms/android-16/arch-x86/usr/include/linux/relay.h

   1 /****************************************************************************
   2  ****************************************************************************
   3  ***
   4  ***   This header was automatically generated from a Linux kernel header
   5  ***   of the same name, to make information necessary for userspace to
   6  ***   call into the kernel available to libc.  It contains only constants,
   7  ***   structures, and macros generated from the original header, and thus,
   8  ***   contains no copyrightable information.
   9  ***
  10  ****************************************************************************
  11  ****************************************************************************/
  12 #ifndef _LINUX_RELAY_H
  13 #define _LINUX_RELAY_H
  14
  15 #include <linux/types.h>
  16 #include <linux/sched.h>
  17 #include <linux/wait.h>
  18 #include <linux/list.h>
  19 #include <linux/fs.h>
  20 #include <linux/poll.h>
  21 #include <linux/kref.h>
  22
  23 #define FIX_SIZE(x) ((((x) - 1) & PAGE_MASK) + PAGE_SIZE)
  24
  25 #define RELAYFS_CHANNEL_VERSION 6
  26
  27 struct rchan_buf
  28 {
  29  void *start;
  30  void *data;
  31  size_t offset;
  32  size_t subbufs_produced;
  33  size_t subbufs_consumed;
  34  struct rchan *chan;
  35  wait_queue_head_t read_wait;
  36  struct work_struct wake_readers;
  37  struct dentry *dentry;
  38  struct kref kref;
  39  struct page **page_array;
  40  unsigned int page_count;
  41  unsigned int finalized;
  42  size_t *padding;
  43  size_t prev_padding;
  44  size_t bytes_consumed;
  45  unsigned int cpu;
  46 } ____cacheline_aligned;
  47
  48 struct rchan
  49 {
  50  u32 version;
  51  size_t subbuf_size;
  52  size_t n_subbufs;
  53  size_t alloc_size;
  54  struct rchan_callbacks *cb;
  55  struct kref kref;
  56  void *private_data;
  57  size_t last_toobig;
  58  struct rchan_buf *buf[NR_CPUS];
  59 };
  60
  61 struct rchan_callbacks
  62 {
  63
  64  int (*subbuf_start) (struct rchan_buf *buf,
  65  void *subbuf,
  66  void *prev_subbuf,
  67  size_t prev_padding);
  68
  69  void (*buf_mapped)(struct rchan_buf *buf,
  70  struct file *filp);
  71
  72  void (*buf_unmapped)(struct rchan_buf *buf,
  73  struct file *filp);
  74
  75  struct dentry *(*create_buf_file)(const char *filename,
  76  struct dentry *parent,
  77  int mode,
  78  struct rchan_buf *buf,
  79  int *is_global);
  80
  81  int (*remove_buf_file)(struct dentry *dentry);
  82 };
  83
  84 struct rchan *relay_open(const char *base_filename,
  85  struct dentry *parent,
  86  size_t subbuf_size,
  87  size_t n_subbufs,
  88  struct rchan_callbacks *cb);
  89
  90 #endif
  91