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/process.h"
  15 #include "server/thread.h"
  16
  17 struct mapping
  18 {
  19     struct object  obj;             /* object header */
  20     int            size_high;       /* mapping size */
  21     int            size_low;        /* mapping size */
  22     int            protect;         /* protection flags */
  23     struct file   *file;            /* file mapped */
  24 };
  25
  26 static void mapping_dump( struct object *obj, int verbose );
  27 static void mapping_destroy( struct object *obj );
  28
  29 static const struct object_ops mapping_ops =
  30 {
  31     mapping_dump,
  32     no_add_queue,
  33     NULL,  /* should never get called */
  34     NULL,  /* should never get called */
  35     NULL,  /* should never get called */
  36     no_read_fd,
  37     no_write_fd,
  38     no_flush,
  39     no_get_file_info,
  40     mapping_destroy
  41 };
  42
  43 struct object *create_mapping( int size_high, int size_low, int protect,
  44                                int handle, const char *name )
  45 {
  46     struct mapping *mapping;
  47
  48     if (!(mapping = (struct mapping *)create_named_object( name, &mapping_ops,
  49                                                            sizeof(*mapping) )))
  50         return NULL;
  51     if (GET_ERROR() == ERROR_ALREADY_EXISTS)
  52         return &mapping->obj;  /* Nothing else to do */
  53
  54     mapping->size_high = size_high;
  55     mapping->size_low  = size_low;
  56     mapping->protect   = protect;
  57     if (handle != -1)
  58     {
  59         int access = 0;
  60         if (protect & VPROT_READ) access |= GENERIC_READ;
  61         if (protect & VPROT_WRITE) access |= GENERIC_WRITE;
  62         if (!(mapping->file = get_file_obj( current->process, handle, access )))
  63         {
  64             release_object( mapping );
  65             return NULL;
  66         }
  67     }
  68     else mapping->file = NULL;
  69     return &mapping->obj;
  70 }
  71
  72 int open_mapping( unsigned int access, int inherit, const char *name )
  73 {
  74     return open_object( name, &mapping_ops, access, inherit );
  75 }
  76
  77 int get_mapping_info( int handle, struct get_mapping_info_reply *reply )
  78 {
  79     struct mapping *mapping;
  80     int fd;
  81
  82     if (!(mapping = (struct mapping *)get_handle_obj( current->process, handle,
  83                                                       0, &mapping_ops )))
  84         return -1;
  85     reply->size_high = mapping->size_high;
  86     reply->size_low  = mapping->size_low;
  87     reply->protect   = mapping->protect;
  88     if (mapping->file) fd = file_get_mmap_fd( mapping->file );
  89     else fd = -1;
  90     release_object( mapping );
  91     return fd;
  92 }
  93
  94 static void mapping_dump( struct object *obj, int verbose )
  95 {
  96     struct mapping *mapping = (struct mapping *)obj;
  97     assert( obj->ops == &mapping_ops );
  98     fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p name='%s'\n",
  99              mapping->size_high, mapping->size_low, mapping->protect,
 100              mapping->file, get_object_name( &mapping->obj ) );
 101 }
 102
 103 static void mapping_destroy( struct object *obj )
 104 {
 105     struct mapping *mapping = (struct mapping *)obj;
 106     assert( obj->ops == &mapping_ops );
 107     if (mapping->file) release_object( mapping->file );
 108     free( mapping );
 109 }