server/mapping.c

   1 /*
   2  * Server-side file mapping management
   3  *
   4  * Copyright (C) 1999 Alexandre Julliard
   5  */
   6
   7 #include <assert.h>
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <unistd.h>
  11
  12 #include "winerror.h"
  13 #include "winnt.h"
  14 #include "server/thread.h"
  15
  16 struct mapping
  17 {
  18     struct object  obj;             /* object header */
  19     int            size_high;       /* mapping size */
  20     int            size_low;        /* mapping size */
  21     int            protect;         /* protection flags */
  22     struct file   *file;            /* file mapped */
  23 };
  24
  25 static void mapping_dump( struct object *obj, int verbose );
  26 static void mapping_destroy( struct object *obj );
  27
  28 static const struct object_ops mapping_ops =
  29 {
  30     mapping_dump,
  31     no_add_queue,
  32     NULL,  /* should never get called */
  33     NULL,  /* should never get called */
  34     NULL,  /* should never get called */
  35     no_read_fd,
  36     no_write_fd,
  37     no_flush,
  38     mapping_destroy
  39 };
  40
  41 struct object *create_mapping( int size_high, int size_low, int protect,
  42                                int handle, const char *name )
  43 {
  44     struct mapping *mapping;
  45
  46     if (!(mapping = (struct mapping *)create_named_object( name, &mapping_ops,
  47                                                            sizeof(*mapping) )))
  48         return NULL;
  49     if (GET_ERROR() == ERROR_ALREADY_EXISTS)
  50         return &mapping->obj;  /* Nothing else to do */
  51
  52     mapping->size_high = size_high;
  53     mapping->size_low  = size_low;
  54     mapping->protect   = protect;
  55     if (handle != -1)
  56     {
  57         int access = 0;
  58         if (protect & VPROT_READ) access |= GENERIC_READ;
  59         if (protect & VPROT_WRITE) access |= GENERIC_WRITE;
  60         if (!(mapping->file = get_file_obj( current->process, handle, access )))
  61         {
  62             release_object( mapping );
  63             return NULL;
  64         }
  65     }
  66     else mapping->file = NULL;
  67     return &mapping->obj;
  68 }
  69
  70 int open_mapping( unsigned int access, int inherit, const char *name )
  71 {
  72     return open_object( name, &mapping_ops, access, inherit );
  73 }
  74
  75 int get_mapping_info( int handle, struct get_mapping_info_reply *reply )
  76 {
  77     struct mapping *mapping;
  78     int fd;
  79
  80     if (!(mapping = (struct mapping *)get_handle_obj( current->process, handle,
  81                                                       0, &mapping_ops )))
  82         return -1;
  83     reply->size_high = mapping->size_high;
  84     reply->size_low  = mapping->size_low;
  85     reply->protect   = mapping->protect;
  86     if (mapping->file) fd = file_get_mmap_fd( mapping->file );
  87     else fd = -1;
  88     release_object( mapping );
  89     return fd;
  90 }
  91
  92 static void mapping_dump( struct object *obj, int verbose )
  93 {
  94     struct mapping *mapping = (struct mapping *)obj;
  95     assert( obj->ops == &mapping_ops );
  96     fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p\n",
  97              mapping->size_high, mapping->size_low, mapping->protect, mapping->file );
  98 }
  99
 100 static void mapping_destroy( struct object *obj )
 101 {
 102     struct mapping *mapping = (struct mapping *)obj;
 103     assert( obj->ops == &mapping_ops );
 104     if (mapping->file) release_object( mapping->file );
 105     free( mapping );
 106 }