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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 dirfd, pathname, flags
# define WRAPPER_SAFE() FUNCTION_SANDBOX_SAFE_OPEN_INT_AT(dirfd, pathname, flags)
# define USE_AT 1
#else
# define USE_AT 0
#endif
extern int EXTERN_NAME(WRAPPER_ARGS_PROTO);
static int (*WRAPPER_TRUE_NAME)(WRAPPER_ARGS_PROTO) = NULL;
/* Eventually, there is a third parameter: it's mode_t mode */
int WRAPPER_NAME(WRAPPER_ARGS_PROTO)
{
va_list ap;
int mode = 0;
int result = -1;
save_errno();
if (flags & O_CREAT) {
va_start(ap, flags);
mode = va_arg(ap, int);
va_end(ap);
} else {
/* 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()) {
check_dlsym(WRAPPER_TRUE_NAME, WRAPPER_SYMNAME,
WRAPPER_SYMVER);
if (flags & O_CREAT)
result = WRAPPER_TRUE_NAME(WRAPPER_ARGS, mode);
else
result = WRAPPER_TRUE_NAME(WRAPPER_ARGS);
}
return result;
}
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