execlp question

[bobetko]

I need to write function (filedesc) that will return a File Descriptor. File Descriptor will then be used to read content of the current folder.
Can somebody confirm that I am on the right path?

Here is my idea:

int filedesc(){
    int n, fd[2];
    pipe (fd);
    switch (fork()) {
        case 0:
         close(fd[0]);
         dup2(fd[1], STDOUT_FILENO);
         close(fd[1]);
         execlp("ls", "ls", NULL);
        default:
         close(fd[0]);
         dup2(fd[1], STDIN_FILENO);
         close(fd[1]);
         return(STDIN_FILENO);
    }
}

Thanks

 

[Salem]

So far, so good I suppose.

But why are you using this just to read filenames, when opendir / readdir / closedir will do the same without all the messy complication of spawning a new process.

fork() can return an error condition as well, as can pipe()



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[bobetko]

I am trying to learn how to create new proces, do plumbing, and other stuff... Thanks a lot....