Create MultiGB File

Create_MultiGB_File.c

#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>


int main(int argc, char *argv[])
{
long int sz;
char *fname;
int ret,fd;

if (argc != 3)
{
fprintf(stderr, "usage: %s FILENAME new-size-in-gigabytes -- fractions not allowed\n", argv[0]);
fprintf(stdout, "(c) Hemant K  Chitale\n");
return(-1);
}

fname = argv[1];
sz   = atol(argv[2]);

if ((ret = (fd = open(fname, O_RDWR | O_CREAT | O_EXCL, 0666)))  == -1 ) {
perror("open");
return(ret);
}

if ( (ret = fallocate( fd, 0, (loff_t)0, (loff_t)sz * 1024 * 1024 * 1024 )) != 0 ){
perror ("fallocate");
unlink( fname );
return(ret);
}

close(fd);
fprintf(stdout, "File Created.  This utility (c) Hemant K  Chitale\n");
return ret;
}