hwi_next_item()

Find the next item in the hwinfo structure

Synopsis:

#include <hw/sysinfo.h>

unsigned hwi_next_item( unsigned off );

Since:

BlackBerry 10.0.0

Arguments:

off
The offset, in bytes from the start of the hwinfo section, to start from.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

This function is in libc.a, but not in libc.so (in order to save space).

Description:

The hwi_next_item() function finds the next item in the hwinfo structure of the system page.

Returns:

The offset of the next item, or HWI_NULL_OFF if there isn't another item.

Examples:

This program produces a summary of the information that the pidin syspage=hwinfo command displays:

#include <stdio.h>
#include <stdlib.h>
#include <hw/sysinfo.h>
#include <sys/syspage.h>

int main ( void )
{
    unsigned item_offset = 0, tag_offset = 0;
    struct hwi_item *curr_item, *curr_tag;
    int first_tag;

    printf ("Item              Offset  Owner  Tags\n");
    printf ("----              ------  -----  ----\n");
    
    while (item_offset != HWI_NULL_OFF)
    {
        /* Print the type, name, and offset of the current item */

        curr_item = hwi_off2tag (item_offset);  
        printf ("%-6s %-11s %3d",
                &SYSPAGE_ENTRY(strings)->data[curr_item->prefix.name],
                &SYSPAGE_ENTRY(strings)->data[curr_item->itemname],
                item_offset);
        
        /* Print the offset of the owner (if any) */

        if (curr_item->owner == HWI_NULL_OFF)
        {
            printf ("       ");
        } else {
            printf ("    %3d", curr_item->owner);
        }
        
        /* List the tags in this item */

        first_tag = 1;
        tag_offset = hwi_next_tag (item_offset, 1);

        while (tag_offset != HWI_NULL_OFF)
        {
            printf ("%s", first_tag ? "    " : ", ");
            first_tag = 0;
            
            curr_tag = hwi_off2tag (tag_offset);
            printf ("%s",
                    &SYSPAGE_ENTRY(strings)->data[curr_tag->prefix.name]);

            /* Get the offset of the next tag in the current item */

            tag_offset = hwi_next_tag (tag_offset, 1);
        }

        printf ("\n");
        
        /* Get the offset of the next item */

        item_offset = hwi_next_item (item_offset);
    }
    return (EXIT_SUCCESS);
}

The output from this program looks something like this:

Item              Offset  Owner  Tags
----              ------  -----  ----
Group  hw            0
Bus    unknown      12      0
Group  rtc          24     12
Device mc146818     36     24    pad, location
Bus    pci          80      0
Device bios         92     80
Bus    isa         108      0
Group  disk        120    108    diskgeometry
Group  misc        148    108
Device pckbd       160    148    irq, location
Group  serial      208    108
Device 8250        220    208    irq, pad, location, irq, location
Group  parallel    304    108
Device centronics  316    304    pad, location
Group  misc        360     12
Device in-use      372    360    pad, location, location, location, location, irq, irq

Classification:

QNX Neutrino

Safety:  
Cancellation point No
Interrupt handler Yes
Signal handler Yes
Thread Yes

Last modified: 2014-06-24



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