System programming, create two files with same time access and permissions-CodePudding

Create a file foo and foo2 with the same time access and permissions using system programming. I am quite clueless about this, I had to create foo and foo2 outside, and now I am unsure whether this is the correct way to do it or not. This is what I have tried:

#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include<sys/types.h>
#include<sys/wait.h>
#include<string.h>
#include <fcntl.h>

int main()
{
    int fd = open("./foo", O_RDWR);
    
    int fd2 = open("./foo2", O_RDWR);
    if(fd == -1)
    {
        printf("\nError creating foo.");
    }
    else if(fd2 == -1)
    {
        printf("\nError creating foo2.");
    }
    else
    {
        printf("\nFile descripter 1:     %d", fd);  
        printf("\nFile descripter 2:     %d", fd2);
    }
    return 0;
}

CodePudding user response：

As of file creation, the C command is open(), as stated in it's man page (requires some libs, beware):

https://www.man7.org/linux/man-pages/man2/open.2.html

If the user wishes to create or override the file, he may use creat(), which is in reality little more than open() with these flags: O_CREAT|O_WRONLY|O_TRUNC

As for time access, others dwellers may be more helpful; Jabberwocky's link may be of some help.