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Full Discussion: bitwise and if
Top Forums Programming bitwise and if Post 302189511 by Puntino on Saturday 26th of April 2008 04:10:33 AM
Old 04-26-2008
bitwise and if
Hi

Suppose we have these code lines:

#define _IN_USE 0x001 /* set when process slot is in use */
#define _EXITING 0x002 /* set when exit is expected */
#define _REFRESHING 0x004

...
1 main () {
2
3 unsigned r_flags =_REFRESHING;
4
5 if (r_flag & _IN_USE){
6 if (r_flag & _EXITING){
7 printf("EXITING");
8 }
9 if (r_flag & _REFRESHING){
10 printf("REFRESHING");
11 }
12 }
13 }

Will i see on the screen the string REFRESING ? (line 10)
Can I say that REFRESCHING and EXITING are two particular cases of the more generic IN_USE?
Than you in advance
 

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LEARN ABOUT SUSE

hisaxctrl

HISAXCTRL(8)						    Linux System Administration 					      HISAXCTRL(8)

NAME

       hisaxctrl - configure HiSax-Module

SYNOPSIS

       hisaxctrl DriverId command parameters

DESCRIPTION

       hisaxctrl  is  used  to	setup the HiSax-ISDN device driver.  All logging-output is sent to the device /dev/isdnctrl. So you can show it by
       executing cat /dev/isdnctrl.
       NOTE: for devfs systems, the program will automatically use /dev/isdn/isdnctrl if available.

       The use of hisaxctrl only makes sense if you are using the HiSax driver.

OPTIONS

       DriverId
	      is used to identify the card when using more than one passive card. While loading the hisax module  with	insmod,  or  modprobe  the
	      DriverId is set by appending id=idstring1%idstring2%...  to the commandline.

       command
	      is  an integer selecting the setup category. The following values are defined for setting the logging-level of the HiSax-ISDN device
	      driver:

	       0 reports card status infos.
	       1 selects generic debugging.
	      11 selects layer 1 development debugging.
	      13 selects layer 3 development debugging.

       the following commands are used to enable special features during runtime of the HiSax-ISDN device driver.

	       2 set B-channel ON delay to parameter (in ms)
	       5 set B-channel in leased mode
	       6 set B-channel in TESTLOOP mode
	       7 set/reset card in Point To Point mode
	       8 set card in FIXED TEI mode
	       9 load firmware for DSP cards
	      10 set B-channel usage limit to 1 or 2 channels
	      12 set echo logging mode (only for some cards)
		 B-channel usage limit needs to be 1 if enabled

       parameter
	      If the command is 9 then the parameter is the full pathname to the file containing the firmware.

	      For debug settings this is an integer representing a bitmask. Every bit in this mask switches a debug facility on or off.  Depending
	      on the selected category, the following values are defined:

	      With generic debugging selected
	      (command 1):

	      0x001 Link-level <--> hardware-level communication
	      0x002 Top state machine
	      0x004 D-Channel Q.931 (call control messages)
	      0x008 D-Channel Q.921
	      0x010 B-Channel X.75
	      0x020 D-Channel l2
	      0x040 B-Channel l2
	      0x080 D-Channel link state debugging
	      0x100 B-Channel link state debugging
	      0x200 TEI debug
	      0x400 LOCK debug in callc.c
	      0x800 More debug in callc.c (not for normal use)

	      With layer 1 development debugging selected
	      (command 11):

	      0x001 Warnings (default: on)
	      0x002 IRQ status
	      0x004 ISAC
	      0x008 ISAC FIFO
	      0x010 HSCX
	      0x020 HSCX FIFO (attention: full B-Channel output!)
	      0x040 D-Channel LAPD frame types

	      With layer 3 development debugging selected
	      (command 13):

	      0x001 Warnings (default: on)
	      0x002 l3 protocol discriptor errors
	      0x004 l3 state machine
	      0x008 charge info debugging (1TR6)

EXAMPLE

       hisaxctrl HiSax 1 0x3ff
	      enables full generic debugging.

AUTHOR

       (C) 2000  by Karsten Keil <kkeil@suse.de>

SEE ALSO

       isdnctrl(8), isdn_cause(7), isdninfo(4).

isdn4k-utils-3.13						    2001/08/09							      HISAXCTRL(8)
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