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/*
* (C) Copyright 1996- ECMWF.
*
* This software is licensed under the terms of the Apache Licence Version 2.0
* which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
* In applying this licence, ECMWF does not waive the privileges and immunities
* granted to it by virtue of its status as an intergovernmental organisation nor
* does it submit to any jurisdiction.
*/
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <unistd.h>
#include <cassert>
#include <cerrno>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <iostream>
#include <limits>
#include "eckit/eckit.h"
#include "eckit/exception/Exceptions.h"
#include "eckit/filesystem/PathName.h"
#include "eckit/log/Bytes.h"
#include "eckit/testing/Test.h"
#define TOTAL_SIZE (SIZE_2G + SIZE_1M) // 2Gb + 1Mb file
// #define TOTAL_SIZE 2*SIZE_2G // 4Gb file
#define SIZE_2G 2147483648 // 2^31
#define SIZE_1M 1048576 // 2^20
using namespace std;
using namespace eckit;
using namespace eckit::testing;
namespace eckit::test {
//----------------------------------------------------------------------------------------------------------------------
CASE("test_large_file") {
std::cout << "off_t can index " << Bytes(std::pow(2.0, (int)sizeof(off_t) * 8)) << std::endl;
// make temporary file name
int fd;
char filename[] = "large.XXXXXX";
if ((fd = ::mkstemp(filename)) == -1) {
::perror("cannot create temporary file"), ::exit(EXIT_FAILURE);
}
std::cout << "openning file '" << filename << "'" << std::endl;
// file is opened in mkstemp, so this is not needed
// if( ( fd = ::open(filename, O_RDWR | O_CREAT | O_TRUNC, (mode_t)0600) ) == -1 )
// perror("Error opening file"), exit(EXIT_FAILURE);
// stretch the file size
if ((long long)::lseek(fd, TOTAL_SIZE - 1, SEEK_SET) < 0) {
::perror("Error calling lseek() to 'stretch' the file"), ::exit(EXIT_FAILURE);
}
// write something to the end of the file to actually resize it correctly
if (::write(fd, "", 1) != 1) {
::close(fd), perror("Error writing last byte of the file"), ::exit(EXIT_FAILURE);
}
// lock the region beyond the 2GB limit until the EOF
struct flock fl;
fl.l_type = F_WRLCK; // F_RDLCK, F_WRLCK, F_UNLCK
fl.l_whence = SEEK_SET; // SEEK_SET, SEEK_CUR, SEEK_END
fl.l_start = SIZE_2G; // Offset from l_whence
fl.l_len = 0; // length, 0 = to EOF
fl.l_pid = getpid(); // PID
fcntl(fd, F_SETLKW, &fl);
// unlock the region
fl.l_type = F_UNLCK;
fcntl(fd, F_SETLK, &fl);
eckit::PathName file(filename);
file.unlink();
}
//----------------------------------------------------------------------------------------------------------------------
} // namespace eckit::test
int main(int argc, char** argv) {
return run_tests(argc, argv);
}
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