Create a new file under linux source code

This snippet submitted by Chol Nhial on 2012-09-21. It has been viewed 105055 times.
Rating of 7.4 with 587 votes

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

char* program_name;

void system_error(char* cause, int exit_code)
{
fprintf(stderr,"%s: %s: %s\n",program_name,cause, (char*) strerror(errno));
exit(exit_code);
}


int main(int argc, char **argv)
{
if(argc != 2)
{
printf("Usage: %s <filename>\n",argv[0]);
exit(EXIT_FAILURE);
}
program_name = argv[0];
/* Permisions for the new file */
mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH;

/* filename for the new file */
char* filename = argv[1];

/* Create a new file */
int fd = open(filename,O_CREAT | O_EXCL,mode);
if(fd == -1)
{
system_error("open",EXIT_FAILURE);
}

exit(EXIT_SUCCESS);
}

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