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DrI-T/birth.c

Last active September 20, 2021 10:19
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birth time
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birth.c
#define _GNU_SOURCE
#define _ATFILE_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include "statx.h"
#include <time.h>
#include <getopt.h>
#include <string.h>
// does not (yet) provide a wrapper for the statx() system call
#include <sys/syscall.h>
/* this code works ony with x86 and x86_64 */
#if __x86_64__
#define __NR_statx 332
#else
#define __NR_statx 383
#endif
#define statx(a,b,c,d,e) syscall(__NR_statx,(a),(b),(c),(d),(e))
int main(int argc, char *argv[])
{
int dirfd = AT_FDCWD;
int flags = AT_SYMLINK_NOFOLLOW;
unsigned int mask = STATX_ALL;
struct statx stxbuf;
long ret = 0;
int opt = 0;
while(( opt = getopt(argc, argv, "alfd")) != -1)
{
switch(opt) {
case 'a':
flags |= AT_NO_AUTOMOUNT;
break;
case 'l':
flags &= ~AT_SYMLINK_NOFOLLOW;
break;
case 'f':
flags &= ~AT_STATX_SYNC_TYPE;
flags |= AT_STATX_FORCE_SYNC;
break;
case 'd':
flags &= ~AT_STATX_SYNC_TYPE;
flags |= AT_STATX_DONT_SYNC;
break;
default:
exit(EXIT_SUCCESS);
break;
}
}
if (optind >= argc) {
exit(EXIT_FAILURE);
}
for (; optind < argc; optind++) {
memset(&stxbuf, 0xbf, sizeof(stxbuf));
ret = statx(dirfd, argv[optind], flags, mask, &stxbuf);
if( ret < 0)
{
perror("statx");
return EXIT_FAILURE;
}
printf("%lld%u\n", *&stxbuf.stx_btime.tv_sec, *&stxbuf.stx_btime.tv_nsec);
}
return EXIT_SUCCESS;
}
Raw
build.sh
#
gcc -o birth birth.c
Raw
statx.h
/*
Copyright (C) 2017 Wolfgang Hotwagner <code@feedyourhead.at>
This file is part of statx-fun
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, write to the
Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
Boston, MA 02110-1301 USA
*/
#ifndef STATX_H
#define STATX_H
#include <asm-generic/statfs.h>
/* from kernel-sources include/uapi/linux/stat.h */
#define STATX_TYPE 0x00000001U /* Want/got stx_mode & S_IFMT */
#define STATX_MODE 0x00000002U /* Want/got stx_mode & ~S_IFMT */
#define STATX_NLINK 0x00000004U /* Want/got stx_nlink */
#define STATX_UID 0x00000008U /* Want/got stx_uid */
#define STATX_GID 0x00000010U /* Want/got stx_gid */
#define STATX_ATIME 0x00000020U /* Want/got stx_atime */
#define STATX_MTIME 0x00000040U /* Want/got stx_mtime */
#define STATX_CTIME 0x00000080U /* Want/got stx_ctime */
#define STATX_INO 0x00000100U /* Want/got stx_ino */
#define STATX_SIZE 0x00000200U /* Want/got stx_size */
#define STATX_BLOCKS 0x00000400U /* Want/got stx_blocks */
#define STATX_BASIC_STATS 0x000007ffU /* The stuff in the normal stat struct */
#define STATX_BTIME 0x00000800U /* Want/got stx_btime */
#define STATX_ALL 0x00000fffU /* All currently supported flags */
#define STATX__RESERVED 0x80000000U /* Reserved for future struct statx expansion */
struct statx_timestamp {
__s64 tv_sec;
__u32 tv_nsec;
__s32 __reserved;
};
struct statx {
/* 0x00 */
__u32 stx_mask; /* What results were written [uncond] */
__u32 stx_blksize; /* Preferred general I/O size [uncond] */
__u64 stx_attributes; /* Flags conveying information about the file [uncond] */
/* 0x10 */
__u32 stx_nlink; /* Number of hard links */
__u32 stx_uid; /* User ID of owner */
__u32 stx_gid; /* Group ID of owner */
__u16 stx_mode; /* File mode */
__u16 __spare0[1];
/* 0x20 */
__u64 stx_ino; /* Inode number */
__u64 stx_size; /* File size */
__u64 stx_blocks; /* Number of 512-byte blocks allocated */
__u64 stx_attributes_mask; /* Mask to show what's supported in stx_attributes */
/* 0x40 */
struct statx_timestamp stx_atime; /* Last access time */
struct statx_timestamp stx_btime; /* File creation time */
struct statx_timestamp stx_ctime; /* Last attribute change time */
struct statx_timestamp stx_mtime; /* Last data modification time */
/* 0x80 */
__u32 stx_rdev_major; /* Device ID of special file [if bdev/cdev] */
__u32 stx_rdev_minor;
__u32 stx_dev_major; /* ID of device containing file [uncond] */
__u32 stx_dev_minor;
/* 0x90 */
__u64 __spare2[14]; /* Spare space for future expansion */
/* 0x100 */
};
/* from kernel sources: include/uapi/linux/stat.h */
#define AT_STATX_SYNC_TYPE 0x6000 /* Type of synchronisation required from statx() */
#define AT_STATX_SYNC_AS_STAT 0x0000 /* - Do whatever stat() does */
#define AT_STATX_FORCE_SYNC 0x2000 /* - Force the attributes to be sync'd with the server */
#define AT_STATX_DONT_SYNC 0x4000 /* - Don't sync attributes with the server */
#endif
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