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/*
* Copyright (c) 2023, Red Hat, Inc.
* Copyright (c) 2024 Alibaba Group Holding Limited. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include "jni.h"
#include <stdbool.h>
#if defined(__linux__)
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dlfcn.h>
#ifndef STATX_BASIC_STATS
#define STATX_BASIC_STATS 0x000007ffU
#endif
#ifndef STATX_BTIME
#define STATX_BTIME 0x00000800U
#endif
#ifndef RTLD_DEFAULT
#define RTLD_DEFAULT RTLD_LOCAL
#endif
#ifndef AT_SYMLINK_NOFOLLOW
#define AT_SYMLINK_NOFOLLOW 0x100
#endif
#ifndef AT_FDCWD
#define AT_FDCWD -100
#endif
#ifndef __GLIBC__
// Alpine doesn't know these types, define them
typedef unsigned int __uint32_t;
typedef unsigned short __uint16_t;
typedef unsigned long int __uint64_t;
#endif
/*
* Timestamp structure for the timestamps in struct statx.
*/
struct my_statx_timestamp {
int64_t tv_sec;
__uint32_t tv_nsec;
int32_t __reserved;
};
/*
* struct statx used by statx system call on >= glibc 2.28
* systems
*/
struct my_statx
{
__uint32_t stx_mask;
__uint32_t stx_blksize;
__uint64_t stx_attributes;
__uint32_t stx_nlink;
__uint32_t stx_uid;
__uint32_t stx_gid;
__uint16_t stx_mode;
__uint16_t __statx_pad1[1];
__uint64_t stx_ino;
__uint64_t stx_size;
__uint64_t stx_blocks;
__uint64_t stx_attributes_mask;
struct my_statx_timestamp stx_atime;
struct my_statx_timestamp stx_btime;
struct my_statx_timestamp stx_ctime;
struct my_statx_timestamp stx_mtime;
__uint32_t stx_rdev_major;
__uint32_t stx_rdev_minor;
__uint32_t stx_dev_major;
__uint32_t stx_dev_minor;
__uint64_t __statx_pad2[14];
};
typedef int statx_func(int dirfd, const char *restrict pathname, int flags,
unsigned int mask, struct my_statx *restrict statxbuf);
static statx_func* my_statx_func = NULL;
#endif //#defined(__linux__)
// static native boolean linuxIsCreationTimeSupported()
JNIEXPORT jboolean JNICALL
Java_CreationTimeHelper_linuxIsCreationTimeSupported(JNIEnv *env, jclass cls, jstring file) {
#if defined(__linux__)
struct my_statx stx = {0};
int ret, atflag = AT_SYMLINK_NOFOLLOW;
unsigned int mask = STATX_BASIC_STATS | STATX_BTIME;
my_statx_func = (statx_func*) dlsym(RTLD_DEFAULT, "statx");
if (my_statx_func == NULL) {
return false;
}
if (file == NULL) {
printf("input file error!\n");
return JNI_FALSE;
}
const char *utfChars = (*env)->GetStringUTFChars(env, file, NULL);
if (utfChars == NULL) {
printf("jstring convert to char array error!\n");
return JNI_FALSE;
}
ret = my_statx_func(AT_FDCWD, utfChars, atflag, mask, &stx);
if (file != NULL && utfChars != NULL) {
(*env)->ReleaseStringUTFChars(env, file, utfChars);
}
if (ret != 0) {
return JNI_FALSE;
}
// On some systems where statx is available but birth time might still not
// be supported as it's file system specific. The only reliable way to
// check for supported or not is looking at the filled in STATX_BTIME bit
// in the returned statx buffer mask.
if ((stx.stx_mask & STATX_BTIME) != 0)
return JNI_TRUE;
return JNI_FALSE;
#else
return JNI_FALSE;
#endif
}
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