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Full Discussion: Pipe usage error while visiting directories
Top Forums Programming Pipe usage error while visiting directories Post 303032909 by Corona688 on Tuesday 26th of March 2019 02:05:19 PM
Old 03-26-2019
If it's saying bad file descriptor it probably means it. Without seeing your actual code, I can't tell why you're closing a bad file descriptor, you should print the FD's to stderr when you open a pipe, and print them to stderr again when you try and close it to see what's going on. But I have some further comments.

fork() is pointless. Disks don't multithread. Forcing it to read 19 directories at once will make your disk run 19 times slower. You already benefit from the caching and read-ahead built into the OS, too.

Second, there's a system function for what you want to do, ftw() It operates depth-first, so every time you see a new second-level folder, you'll know everything afterwards will be within that folder until it leaves.

Code:
#include <ftw.h>
#include <sys/stat.h>
#include <stdio.h>
#include <string.h>

struct FTW {
        int base;
        int level;
};

struct result_t {
        char name[256];
        long int size;
} result[64];

int last_result=0;

int ftw_callback(const char *fpath, const struct stat *sb,
        int typeflag, struct FTW *ftwbuf);

int main(void) {
        int n;
        const char *ROOT="./";
        strcpy(result[0].name, ROOT);
        ftw(ROOT, ftw_callback, 8);

        for(n=0; n<=last_result; n++)
                printf("%s\t%ld bytes\n", result[n].name, result[n].size);
}

int ftw_callback(const char *fpath, const struct stat *sb,
        int typeflag, struct FTW *ftwbuf) {

        // Found a new second-level folder
        if((typeflag == FTW_D) && (ftwbuf->level == 1)) {
                last_result++;
                strcpy(result[last_result].name, fpath);
        }

        if(typeflag == FTW_F)
        {
                int res=last_result;
                // Special case for level-1 files, those are in ROOT
                if(ftwbuf->level == 1) res=0;
                result[res].size += sb->st_size;
        }

        return(0);
}

Last edited by Corona688; 03-26-2019 at 03:18 PM..
This User Gave Thanks to Corona688 For This Post:
beginnerboy
 

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LEARN ABOUT OSX

createhomedir

createhomedir(1)					    BSD General Commands Manual 					  createhomedir(1)

NAME

     createhomedir -- create and populate home directories on the local computer.

SYNOPSIS

     createhomedir [-scbalh] [-n directoryDomainName] [-u username]

DESCRIPTION

     createhomedir provides several options for creating and populating home directories.

OPTIONS

     -s       creates home directories for server home paths only (default).

     -c       creates home directories for local home paths only.

     -b       creates home directories for both server and local home paths.

     -a       creates home directories for users defined in all directory domains of the server's search path.

     -l       creates home directories for users defined in the local directory domain.

     -n directoryDomainName
	      creates home directories for users defined in a specific directory domain in the server's search path.

     -u username
	      creates a home directory for a specific user defined in the domain(s) identified in the -a, -l, or -n parameter. If you omit the -a,
	      -l, and -n parameters when you use the -u parameter, -a is assumed.

     -i       reads username list from standard input and creates specified home directories. Each username should be on its own line.

     -h       usage help.

FILES

     /usr/sbin/createhomedir			   location of tool

CAVEATS

     When using the -a option, search limits of various directory servers (such as Open Directory or Active Directory) can prevent all possible
     home directories from being created. In this case, you may need to specify the usernames explicitly.

Mac OS X							   June 1, 2019 							  Mac OS X
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