mirror of
https://github.com/s3fs-fuse/s3fs-fuse.git
synced 2024-11-09 14:20:58 +00:00
83 lines
2.5 KiB
C++
83 lines
2.5 KiB
C++
/*
|
|
* s3fs - FUSE-based file system backed by Amazon S3
|
|
*
|
|
* Copyright(C) 2021 Andrew Gaul <andrew@gaul.org>
|
|
*
|
|
* 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 Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#include <cstdio>
|
|
#include <cstdlib>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
|
|
// [NOTE]
|
|
// This is a program used for file size inspection.
|
|
// File size checking should be done by the caller of this program.
|
|
// This program truncates the file and reads the file in another process
|
|
// between truncate and flush(close file).
|
|
//
|
|
int main(int argc, const char *argv[])
|
|
{
|
|
if(argc != 3){
|
|
fprintf(stderr, "[ERROR] Wrong paraemters\n");
|
|
fprintf(stdout, "[Usage] truncate_read_file <file path> <truncate size(bytes)>\n");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
const char* filepath = argv[1];
|
|
off_t size = static_cast<off_t>(strtoull(argv[2], nullptr, 10));
|
|
int fd;
|
|
|
|
// open file
|
|
if(-1 == (fd = open(filepath, O_RDWR))){
|
|
fprintf(stderr, "[ERROR] Could not open file(%s)\n", filepath);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
// truncate
|
|
if(0 != ftruncate(fd, size)){
|
|
fprintf(stderr, "[ERROR] Could not truncate file(%s) to %lld byte.\n", filepath, (long long)size);
|
|
close(fd);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
// run sub-process for reading file(cat)
|
|
char szCommand[1024];
|
|
snprintf(szCommand, sizeof(szCommand), "cat %s >/dev/null 2>&1", filepath);
|
|
szCommand[sizeof(szCommand) - 1] = '\0'; // for safety
|
|
if(0 != system(szCommand)){
|
|
fprintf(stderr, "[ERROR] Failed to run sub-process(cat).\n");
|
|
close(fd);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
// close file(flush)
|
|
close(fd);
|
|
|
|
exit(EXIT_SUCCESS);
|
|
}
|
|
|
|
/*
|
|
* Local variables:
|
|
* tab-width: 4
|
|
* c-basic-offset: 4
|
|
* End:
|
|
* vim600: expandtab sw=4 ts=4 fdm=marker
|
|
* vim<600: expandtab sw=4 ts=4
|
|
*/
|