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/*
* This programme was originally written by
* Jeff Moyer <jmoyer@redhat.com>
*
* Copyright (C) 2016, Red Hat, Inc.
*/
#define _GNU_SOURCE 1
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <libaio.h>
#include <errno.h>
#include <sys/time.h>
void usage(char *prog)
{
fprintf(stderr,
"usage: %s <src file> <dest file> <size> <msg>\n",
prog);
exit(1);
}
void err_exit(char *op, unsigned long len, char *s)
{
fprintf(stderr, "%s(%s) len %lu %s\n",
op, strerror(errno), len, s);
exit(1);
}
int main(int argc, char **argv)
{
int fd, fd2, ret, dio = 1;
char *map;
char *msg;
char *sfile;
char *dfile;
unsigned long len, opt;
if (argc < 5)
usage(basename(argv[0]));
while ((opt = getopt(argc, argv, "b")) != -1)
dio = 0;
sfile = argv[optind];
dfile = argv[optind + 1];
msg = argv[optind + 3];
len = strtoul(argv[optind + 2], NULL, 10);
if (errno == ERANGE)
err_exit("strtoul", 0, msg);
/* Open source file and mmap*/
fd = open(sfile, O_RDWR, 0644);
if (fd < 0)
err_exit("open src", len, msg);
map = (char *)mmap(NULL, len,
PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
if (map == MAP_FAILED)
err_exit("mmap", len, msg);
if (dio == 1) {
/* Open dest file with O_DIRECT */
fd2 = open(dfile, O_RDWR|O_DIRECT, 0644);
if (fd2 < 0)
err_exit("open dest", len, msg);
} else {
/* Open dest file without O_DIRECT */
fd2 = open(dfile, O_RDWR, 0644);
if (fd2 < 0)
err_exit("open dest", len, msg);
}
/* First, test storing to dest file from source mapping */
ret = write(fd2, map, len);
if (ret != len)
err_exit("write", len, msg);
ret = fsync(fd2);
if (ret != 0)
err_exit("fsync", len, msg);
ret = (int)lseek(fd2, 0, SEEK_SET);
if (ret == -1)
err_exit("lseek", len, msg);
/* Next, test reading from dest file into source mapping */
ret = read(fd2, map, len);
if (ret != len)
err_exit("read", len, msg);
ret = msync(map, len, MS_SYNC);
if (ret < 0)
err_exit("msync", len, msg);
ret = munmap(map, len);
if (ret < 0)
err_exit("munmap", len, msg);
ret = close(fd);
if (ret < 0)
err_exit("clsoe fd", len, msg);
ret = close(fd2);
if (ret < 0)
err_exit("close fd2", len, msg);
exit(0);
}
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