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/*
* openat() wrapper.
*
* Copyright 1999-2008 Gentoo Foundation
* Licensed under the GPL-2
*/
#ifndef WRAPPER_ARGS_PROTO /* let open() use us */
# define _WRAPPER_ARGS_PROTO int dirfd, const char *pathname, int flags
# define WRAPPER_ARGS_PROTO _WRAPPER_ARGS_PROTO, ...
# define WRAPPER_ARGS_PROTO_FULL _WRAPPER_ARGS_PROTO, mode_t mode
# define WRAPPER_ARGS dirfd, pathname, flags
# define WRAPPER_ARGS_FULL WRAPPER_ARGS, mode
# define WRAPPER_SAFE() FUNCTION_SANDBOX_SAFE_OPEN_INT_AT(dirfd, pathname, flags)
# define USE_AT 1
#else
# define USE_AT 0
#endif
#define WRAPPER_RET_TYPE int
#define WRAPPER_RET_DEFAULT -1
extern WRAPPER_RET_TYPE EXTERN_NAME(WRAPPER_ARGS_PROTO);
static WRAPPER_RET_TYPE (*WRAPPER_TRUE_NAME)(WRAPPER_ARGS_PROTO) = NULL;
attribute_hidden
WRAPPER_RET_TYPE SB_HIDDEN_FUNC(WRAPPER_NAME)(WRAPPER_ARGS_PROTO_FULL)
{
check_dlsym(WRAPPER_TRUE_NAME, WRAPPER_SYMNAME, WRAPPER_SYMVER);
return WRAPPER_TRUE_NAME(WRAPPER_ARGS_FULL);
}
/* Eventually, there is a third parameter: it's mode_t mode */
WRAPPER_RET_TYPE WRAPPER_NAME(WRAPPER_ARGS_PROTO)
{
WRAPPER_RET_TYPE result = WRAPPER_RET_DEFAULT;
if (!(flags & O_CREAT)) {
save_errno();
/* XXX: If we're not trying to create, fail normally if
* file does not stat */
struct stat st;
#if USE_AT
if (dirfd == AT_FDCWD || pathname[0] == '/')
#endif
#undef USE_AT
if (-1 == stat(pathname, &st))
return -1;
restore_errno();
}
if (WRAPPER_SAFE()) {
int mode = 0;
if (flags & O_CREAT) {
va_list ap;
va_start(ap, flags);
mode = va_arg(ap, int);
va_end(ap);
}
result = SB_HIDDEN_FUNC(WRAPPER_NAME)(WRAPPER_ARGS_FULL);
}
return result;
}
#undef _WRAPPER_ARGS_PROTO
#undef WRAPPER_ARGS_PROTO_FULL
#undef WRAPPER_ARGS_FULL
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