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/*
* Copyright (C) 2012 ProFUSION embedded systems
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <errno.h>
#include <dirent.h>
#include <fcntl.h>
#include <dlfcn.h>
#include <limits.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include "testsuite.h"
static void *nextlib;
static const char *rootpath;
static size_t rootpathlen;
static inline bool need_trap(const char *path)
{
return path != NULL && path[0] == '/';
}
static const char *trap_path(const char *path, char buf[PATH_MAX * 2])
{
size_t len;
if (!need_trap(path))
return path;
len = strlen(path);
if (len + rootpathlen > PATH_MAX * 2) {
errno = ENAMETOOLONG;
return NULL;
}
memcpy(buf, rootpath, rootpathlen);
strcpy(buf + rootpathlen, path);
return buf;
}
static bool get_rootpath(const char *f)
{
if (rootpath != NULL)
return true;
rootpath = getenv(S_TC_ROOTFS);
if (rootpath == NULL) {
ERR("TRAP %s(): missing export %s?\n", f, S_TC_ROOTFS);
errno = ENOENT;
return false;
}
rootpathlen = strlen(rootpath);
return true;
}
static void *get_libc_func(const char *f)
{
void *fp;
if (nextlib == NULL) {
#ifdef RTLD_NEXT
nextlib = RTLD_NEXT;
#else
nextlib = dlopen("libc.so.6", RTLD_LAZY);
#endif
}
fp = dlsym(nextlib, f);
assert(fp);
return fp;
}
TS_EXPORT FILE *fopen(const char *path, const char *mode)
{
const char *p;
char buf[PATH_MAX * 2];
static FILE* (*_fopen)(const char *path, const char *mode);
if (!get_rootpath(__func__))
return NULL;
_fopen = get_libc_func("fopen");
p = trap_path(path, buf);
if (p == NULL)
return NULL;
return (*_fopen)(p, mode);
}
TS_EXPORT int open(const char *path, int flags, ...)
{
const char *p;
char buf[PATH_MAX * 2];
static int (*_open)(const char *path, int flags, ...);
if (!get_rootpath(__func__))
return -1;
_open = get_libc_func("open");
p = trap_path(path, buf);
if (p == NULL)
return -1;
if (flags & O_CREAT) {
mode_t mode;
va_list ap;
va_start(ap, flags);
mode = va_arg(ap, mode_t);
va_end(ap);
_open(p, flags, mode);
}
return _open(p, flags);
}
TS_EXPORT int stat(const char *path, struct stat *st)
{
const char *p;
char buf[PATH_MAX * 2];
static int (*_stat)(const char *path, struct stat *buf);
if (!get_rootpath(__func__))
return -1;
_stat = get_libc_func("stat");
p = trap_path(path, buf);
if (p == NULL)
return -1;
return _stat(p, st);
}
#ifdef HAVE___XSTAT
TS_EXPORT int __xstat(int ver, const char *path, struct stat *st)
{
const char *p;
char buf[PATH_MAX * 2];
static int (*_xstat)(int __ver, const char *__filename,
struct stat *__stat_buf);
if (!get_rootpath(__func__))
return -1;
_xstat = get_libc_func("__xstat");
p = trap_path(path, buf);
if (p == NULL)
return -1;
return _xstat(ver, p, st);
}
#endif
TS_EXPORT int access(const char *path, int mode)
{
const char *p;
char buf[PATH_MAX * 2];
static int (*_access)(const char *path, int mode);
if (!get_rootpath(__func__))
return -1;
_access = get_libc_func("access");
p = trap_path(path, buf);
if (p == NULL)
return -1;
return _access(p, mode);
}
TS_EXPORT DIR *opendir(const char *path)
{
const char *p;
char buf[PATH_MAX * 2];
static DIR* (*_opendir)(const char *path);
if (!get_rootpath(__func__))
return NULL;
_opendir = get_libc_func("opendir");
p = trap_path(path, buf);
if (p == NULL)
return NULL;
return (*_opendir)(p);
}
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