fedora core 6 1.2949 + vserver 2.2.0

[linux-2.6.git] / include / linux / poll.h

diff --git a/include/linux/poll.h b/include/linux/poll.h
index b4bb681..2769079 100644 (file)
--- a/include/linux/poll.h
+++ b/include/linux/poll.h
@@ -5,11 +5,22 @@
 
 #ifdef __KERNEL__
 
+#include <linux/compiler.h>
 #include <linux/wait.h>
 #include <linux/string.h>
-#include <linux/mm.h>
+#include <linux/fs.h>
+#include <linux/sched.h>
 #include <asm/uaccess.h>
 
+/* ~832 bytes of stack space used max in sys_select/sys_poll before allocating
+   additional memory. */
+#define MAX_STACK_ALLOC 832
+#define FRONTEND_STACK_ALLOC   256
+#define SELECT_STACK_ALLOC     FRONTEND_STACK_ALLOC
+#define POLL_STACK_ALLOC       FRONTEND_STACK_ALLOC
+#define WQUEUES_STACK_ALLOC    (MAX_STACK_ALLOC - FRONTEND_STACK_ALLOC)
+#define N_INLINE_POLL_ENTRIES  (WQUEUES_STACK_ALLOC / sizeof(struct poll_table_entry))
+
 struct poll_table_struct;
 
 /* 
@@ -32,6 +43,12 @@ static inline void init_poll_funcptr(poll_table *pt, poll_queue_proc qproc)
        pt->qproc = qproc;
 }
 
+struct poll_table_entry {
+       struct file * filp;
+       wait_queue_t wait;
+       wait_queue_head_t * wait_address;
+};
+
 /*
  * Structures and helpers for sys_poll/sys_poll
  */
@@ -39,6 +56,8 @@ struct poll_wqueues {
        poll_table pt;
        struct poll_table_page * table;
        int error;
+       int inline_index;
+       struct poll_table_entry inline_entries[N_INLINE_POLL_ENTRIES];
 };
 
 extern void poll_initwait(struct poll_wqueues *pwq);
@@ -70,22 +89,19 @@ static inline
 int get_fd_set(unsigned long nr, void __user *ufdset, unsigned long *fdset)
 {
        nr = FDS_BYTES(nr);
-       if (ufdset) {
-               int error;
-               error = verify_area(VERIFY_WRITE, ufdset, nr);
-               if (!error && __copy_from_user(fdset, ufdset, nr))
-                       error = -EFAULT;
-               return error;
-       }
+       if (ufdset)
+               return copy_from_user(fdset, ufdset, nr) ? -EFAULT : 0;
+
        memset(fdset, 0, nr);
        return 0;
 }
 
-static inline
-void set_fd_set(unsigned long nr, void __user *ufdset, unsigned long *fdset)
+static inline unsigned long __must_check
+set_fd_set(unsigned long nr, void __user *ufdset, unsigned long *fdset)
 {
        if (ufdset)
-               __copy_to_user(ufdset, fdset, FDS_BYTES(nr));
+               return __copy_to_user(ufdset, fdset, FDS_BYTES(nr));
+       return 0;
 }
 
 static inline
@@ -94,7 +110,11 @@ void zero_fd_set(unsigned long nr, unsigned long *fdset)
        memset(fdset, 0, FDS_BYTES(nr));
 }
 
-extern int do_select(int n, fd_set_bits *fds, long *timeout);
+#define MAX_INT64_SECONDS (((s64)(~((u64)0)>>1)/HZ)-1)
+
+extern int do_select(int n, fd_set_bits *fds, s64 *timeout);
+extern int do_sys_poll(struct pollfd __user * ufds, unsigned int nfds,
+                      s64 *timeout);
 
 #endif /* KERNEL */