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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 SUNOS

usb_pipe_get_state

usb_pipe_get_state(9F)					   Kernel Functions for Drivers 				    usb_pipe_get_state(9F)

NAME

       usb_pipe_get_state - Return USB pipe state

SYNOPSIS

       #include <sys/usb/usba.h>

       int usb_pipe_get_state(usb_pipe_handle_t pipe_handle, usb_pipe_state_t *pipe_state, usb_flags_t usb_flags);

INTERFACE LEVEL

       Solaris DDI specific (Solaris DDI)

PARAMETERS

       pipe_handle

	   Handle of the pipe to retrieve the state.

       pipe_state

	   Pointer to where pipe state is returned.

       usb_flags

	   No flags are recognized. Reserved for future 			expansion.

DESCRIPTION

       The usb_pipe_get_state() function retrieves the state of the pipe referred to by pipe_handle into the location pointed to by pipe_state.

       Possible pipe states are:

       USB_PIPE_STATE_CLOSED

	   Pipe is closed.

       USB_PIPE_STATE_ACTIVE

	   Pipe is active and can send/receive data. Polling is active for isochronous and interrupt pipes.

       USB_PIPE_STATE_IDLE

	   Polling is stopped for isochronous and interrupt-IN pipes.

       USB_PIPE_STATE_ERROR

	   An error occurred. Client must call usb_pipe_reset(). Note that this status is not seen by a client driver if USB_ATTRS_AUTOCLEARING is
	   set in the request attributes.

       USB_PIPE_STATE_CLOSING

	   Pipe is being closed.  Requests are being drained from the pipe	     and other cleanup is in progress.

RETURN VALUES

       USB_SUCCESS		       Pipe state returned in second argument.

       USB_INVALID_ARGS 	       Pipe_state argument is NULL.

       USB_INVALID_PIPE 	       Pipe_handle argument is NULL.

CONTEXT

       May be called from user, kernel or interrupt context.

EXAMPLES

	   usb_pipe_handle_t pipe;
	   usb_pipe_state_t state;

	   /* Recover if the pipe is in an error state. */
	   if ((usb_pipe_get_state(pipe, &state, 0) == USB_SUCCESS) &&
	       (state == USB_PIPE_STATE_ERROR)) {
		   cmn_err (CE_WARN, "%s%d: USB Pipe error.",
		       ddi_driver_name(dip), ddi_get_instance(dip));
		   do_recovery();
	   }

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Architecture		     |PCI-based systems 	   |
       +-----------------------------+-----------------------------+
       |Interface stability	     |Evolving			   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWusb			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5), usb_clr_feature(9F), usb_get_cfg(9F).  usb_get_status(9F),  usb_pipe_close(9F),  usb_pipe_ctrl_xfer(9F),	usb_pipe_open(9F).
       usb_pipe_reset(9F)

SunOS 5.10							    5 Jan 2004						    usb_pipe_get_state(9F)
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