Question

Whenever I use open I get the permission denied error. But when I use fopen it opens the file fine. What is wrong with my code?

mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
char *filename = "dataread.txt";

rec = open(filename ,O_WRONLY | O_CREAT | O_TRUNC,mode);
if(rec == -1)
{
    perror("\nopen error 1:");
    exit(1);
}

Error:

open error 1:: Permission denied

With fopen I don’t get this error.

Answer 1

I added an int rec=0; var declaration and the necessary includes files and then compiled your code.
It runs with no errors as a normal user in my Fedora 15 laptop. Check the dir/file permissions you are running this on, the problems does not seem to be in the code.