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libwine: Reorganize the mmap code a bit to avoid some #ifdefs.

This commit is contained in:
Alexandre Julliard 2006-04-13 21:53:41 +02:00
parent f9ff7bf4d9
commit b7d5b31cf1
1 changed files with 35 additions and 29 deletions
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64
libs/wine/mmap.c
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@ -25,6 +25,7 @@
#include <ctype.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#ifdef HAVE_SYS_MMAN_H
@ -50,14 +51,32 @@ struct reserved_area
static struct list reserved_areas = LIST_INIT(reserved_areas);
static const int granularity_mask = 0xffff; /* reserved areas have 64k granularity */
#ifdef HAVE_MMAP
#ifndef MAP_NORESERVE
#define MAP_NORESERVE 0
#endif
#ifndef HAVE_MMAP
static inline int munmap( void *ptr, size_t size ) { return 0; }
#ifndef MAP_PRIVATE
#define MAP_PRIVATE 0
#endif
#ifndef MAP_ANON
#define MAP_ANON 0
#endif
static inline int get_fdzero(void)
{
static int fd = -1;
if (MAP_ANON == 0 && fd == -1)
{
if ((fd = open( "/dev/zero", O_RDONLY )) == -1)
{
perror( "/dev/zero: open" );
exit(1);
}
}
return fd;
}
#if (defined(__svr4__) || defined(__NetBSD__)) && !defined(MAP_TRYFIXED)
/***********************************************************************
@ -172,30 +191,12 @@ static int try_mmap_fixed (void *addr, size_t len, int prot, int flags,
*/
void *wine_anon_mmap( void *start, size_t size, int prot, int flags )
{
#ifdef HAVE_MMAP
static int fdzero = -1;
#ifdef MAP_ANON
flags |= MAP_ANON;
#else
if (fdzero == -1)
{
if ((fdzero = open( "/dev/zero", O_RDONLY )) == -1)
{
perror( "/dev/zero: open" );
exit(1);
}
}
#endif /* MAP_ANON */
#ifdef MAP_SHARED
flags &= ~MAP_SHARED;
#endif
/* Linux EINVAL's on us if we don't pass MAP_PRIVATE to an anon mmap */
#ifdef MAP_PRIVATE
flags |= MAP_PRIVATE;
#endif
flags |= MAP_PRIVATE | MAP_ANON;
if (!(flags & MAP_FIXED))
{
@ -208,19 +209,14 @@ void *wine_anon_mmap( void *start, size_t size, int prot, int flags )
/* If available, this will attempt a fixed mapping in-kernel */
flags |= MAP_TRYFIXED;
#elif defined(__svr4__) || defined(__NetBSD__) || defined(__APPLE__)
if ( try_mmap_fixed( start, size, prot, flags, fdzero, 0 ) )
if ( try_mmap_fixed( start, size, prot, flags, get_fdzero(), 0 ) )
return start;
#endif
}
return mmap( start, size, prot, flags, fdzero, 0 );
#else
return (void *)-1;
#endif
return mmap( start, size, prot, flags, get_fdzero(), 0 );
}
#ifdef HAVE_MMAP
/***********************************************************************
* reserve_area
*
@ -329,6 +325,16 @@ void mmap_init(void)
#else /* HAVE_MMAP */
void *wine_anon_mmap( void *start, size_t size, int prot, int flags )
{
return (void *)-1;
}
static inline int munmap( void *ptr, size_t size )
{
return 0;
}
void mmap_init(void)
{
}