Mercurial > hg > nginx-quic
view src/os/win32/ngx_atomic.h @ 4487:a786c85e8268
Disable symlinks: don't allow creating or truncating a file via a symlink in
the last path component if "if_not_owner" parameter is used.
To prevent race condition we have to open a file before checking its owner and
there's no way to change access flags for already opened file descriptor, so
we disable symlinks for the last path component at all if flags allow creating
or truncating the file.
author | Valentin Bartenev <vbart@nginx.com> |
---|---|
date | Tue, 21 Feb 2012 15:04:41 +0000 |
parents | d620f497c50f |
children | 3d2d3e1cf427 |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #ifndef _NGX_ATOMIC_H_INCLUDED_ #define _NGX_ATOMIC_H_INCLUDED_ #include <ngx_config.h> #include <ngx_core.h> #define NGX_HAVE_ATOMIC_OPS 1 typedef int32_t ngx_atomic_int_t; typedef uint32_t ngx_atomic_uint_t; typedef volatile ngx_atomic_uint_t ngx_atomic_t; #define NGX_ATOMIC_T_LEN (sizeof("-2147483648") - 1) #if defined( __WATCOMC__ ) || defined( __BORLANDC__ ) || ( _MSC_VER >= 1300 ) /* the new SDK headers */ #define ngx_atomic_cmp_set(lock, old, set) \ ((ngx_atomic_uint_t) InterlockedCompareExchange((long *) lock, set, old) \ == old) #else /* the old MS VC6.0SP2 SDK headers */ #define ngx_atomic_cmp_set(lock, old, set) \ (InterlockedCompareExchange((void **) lock, (void *) set, (void *) old) \ == (void *) old) #endif #define ngx_atomic_fetch_add(p, add) InterlockedExchangeAdd((long *) p, add) #define ngx_memory_barrier() #if defined( __BORLANDC__ ) || ( __WATCOMC__ < 1230 ) /* * Borland C++ 5.5 (tasm32) and Open Watcom C prior to 1.3 * do not understand the "pause" instruction */ #define ngx_cpu_pause() #else #define ngx_cpu_pause() __asm { pause } #endif void ngx_spinlock(ngx_atomic_t *lock, ngx_atomic_int_t value, ngx_uint_t spin); #define ngx_trylock(lock) (*(lock) == 0 && ngx_atomic_cmp_set(lock, 0, 1)) #define ngx_unlock(lock) *(lock) = 0 #endif /* _NGX_ATOMIC_H_INCLUDED_ */