diff options
Diffstat (limited to 'libio/libioP.h')
| -rw-r--r-- | libio/libioP.h | 51 |
1 files changed, 48 insertions, 3 deletions
diff --git a/libio/libioP.h b/libio/libioP.h index 008f9b7edf..c9a639ab9a 100644 --- a/libio/libioP.h +++ b/libio/libioP.h @@ -396,7 +396,8 @@ extern void (*_IO_cleanup_registration_needed) __P ((void)); #define EOF (-1) #endif #ifndef NULL -#ifdef __GNUG__ +#if defined __GNUG__ && \ + (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8)) #define NULL (__null) #else #if !defined(__cplusplus) @@ -407,8 +408,52 @@ extern void (*_IO_cleanup_registration_needed) __P ((void)); #endif #endif -#define FREE_BUF(_B) free(_B) -#define ALLOC_BUF(_S) (char*)malloc(_S) +#if _G_HAVE_MMAP + +#include <unistd.h> +#include <fcntl.h> +#include <sys/mman.h> +#include <sys/param.h> + +#if !defined(MAP_ANONYMOUS) && defined(MAP_ANON) +#define MAP_ANONYMOUS MAP_ANON +#endif + +#if !defined(MAP_ANONYMOUS) || !defined(EXEC_PAGESIZE) +#undef _G_HAVE_MMAP +#define _G_HAVE_MMAP 0 +#endif + +#endif /* _G_HAVE_MMAP */ + +#if _G_HAVE_MMAP + +#define ROUND_TO_PAGE(_S) \ + (((_S) + EXEC_PAGESIZE - 1) & ~(EXEC_PAGESIZE - 1)) + +#define FREE_BUF(_B, _S) \ + munmap ((_B), ROUND_TO_PAGE (_S)) +#define ALLOC_BUF(_B, _S, _R) \ + do { \ + (_B) = (char *) mmap (0, ROUND_TO_PAGE (_S), \ + PROT_READ | PROT_WRITE, \ + MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); \ + if ((_B) == (char *) -1) \ + return (_R); \ + } while (0) + +#else /* _G_HAVE_MMAP */ + +#define FREE_BUF(_B, _S) \ + free(_B) +#define ALLOC_BUF(_B, _S, _R) \ + do { \ + (_B) = (char*)malloc(_S); \ + if ((_B) == NULL) \ + return (_R); \ + } while (0) + +#endif /* _G_HAVE_MMAP */ #ifndef OS_FSTAT #define OS_FSTAT fstat |