portability of int arrays from 32 to 64 bit systems Post: 302337204

9 More Discussions You Might Find Interesting

1. Programming

A C program required for portability

I have to solve a problem for my wife who is engaged in Research in Breast Cancer. 1. She has frequently to search a long single line of alphabetic characters (lower case) for an exact match of a string. e.g....

2. Programming

difference between int ** func() and int *& func()

What is the difference between int** func() and int*& func(). Can you please explain it with suitable example. Thanks, Devesh.

3. UNIX for Dummies Questions & Answers

int open(const char *pathname, int flags, mode_t mode) doubt...

hello everybody! I want to create a file with permissions for read, write, and execute to everybody using C, so I write this code: #include <stdio.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> int main(){ int fileDescriptor; fileDescriptor =...

4. UNIX for Dummies Questions & Answers

Script portability

Hello, May I the right place if I need competencies to migrate DOS script into Unix platforme? Thanks in advance Thierry

5. Shell Programming and Scripting

portability issue linux(2.6) solaris10

the following simple scripts work fine on linux but fail on solaris: #!/bin/bash eval /usr/bin/time -f \'bt=\"%U + %S\"\' ./JUNK >> ./LOG 2>&1 cp ./LOG ./LOG_joe LC_joe=`cat ./LOG | wc -l` LC_joe=`echo $LC_joe-1|bc` tail -1 ./LOG > ./tmp head -$LC_joe ./LOG_joe > ./LOG rm ./LOG_joe ...

6. Shell Programming and Scripting

Script Portability

Hi, I am writing a BASH shell script for a client. I am using BASH on a Macintosh Powerbook G4 running Leopard. My client will be using BASH on a PC running Ubuntu. My questions all revolve around making my script portable so that it will run on his machine. - Do I need to get any other...

7. Solaris

Convert DWORD to int on solaris for 64-bit

i am converting application from 32-bit to 64-bit on Solaris. How can I convert "DWORD" on Solaris 64-bit to int. Thanks.

8. Programming

Handle int listen(int sockfd, int backlog) in TCP

Hi, from the manual listen(2): listen for connections on socket - Linux man page It has a parameter called backlog and it limits the maximum length of queue of pending list. If I set backlog to 128, is it means no more than 128 packets can be handled by server? If I have three...

9. Programming

question about int arrays and file pointer arrays

if i declare both but don't input any variables what values will the int array and file pointer array have on default, and if i want to reset any of the elements of both arrays to default, should i just set it to 0 or NULL or what?

LEARN ABOUT CENTOS

ddi_model_convert_from

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

NAME

       ddi_model_convert_from - determine data model type mismatch

SYNOPSIS

       #include <sys/ddi.h>
       #include <sys/sunddi.h>

	uint_tddi_model_convert_from(uint_t model);

INTERFACE LEVEL

       Solaris DDI specific (Solaris DDI).

PARAMETERS

       model	       The data model type of the current thread.

DESCRIPTION

       ddi_model_convert_from()  is  used  to  determine  if the current thread uses a different C Language Type Model than the device driver. The
       64-bit version of Solaris will require a 64-bit kernel to support both 64-bit and 32-bit user  mode  programs.  The  difference	between  a
       32-bit  program	and  a 64-bit program is in its C Language Type Model: a 32-bit program is ILP32 (integer, longs, and pointers are 32-bit)
       and a 64-bit program is LP64 (longs and pointers are 64-bit). There are a number of driver entry points	such  as  ioctl(9E)  and  mmap(9E)
       where  it  is  necessary  to  identify the C Language Type Model of the user-mode originator of an kernel event. For example any data which
       flows between programs and the device driver or vice versa need to be identical in format. A 64-bit device driver may need  to  modify  the
       format  of the data before sending it to a 32-bit application. ddi_model_convert_from() is used to determine if data that is passed between
       the device driver and the application requires reformatting to any non-native data model.

RETURN VALUES

       DDI_MODEL_ILP32		       A conversion to/from ILP32 is necessary.

       DDI_MODEL_NONE		       No conversion is necessary. Current thread and driver use the same data model.

CONTEXT

       ddi_model_convert_from() can be called from any context.

EXAMPLES

       Example 1: : Using ddi_model_convert_from() in the ioctl() entry point to support both 32-bit and 64-bit applications.

       The following is an example how to use ddi_model_convert_from() in the ioctl() entry point to support both 32-bit and 64-bit applications.

       struct passargs32 {
	       int len;
	       caddr32_t addr;
       };

       struct passargs {
	       int len;
	       caddr_t addr;
       };
       xxioctl(dev_t dev, int cmd, intptr_t arg, int mode,
	   cred_t *credp, int *rvalp) {
	       struct passargs pa;

	       switch (ddi_model_convert_from(mode & FMODELS)) {
		   case DDI_MODEL_ILP32:
		   {
		       struct passargs32 pa32;

		       ddi_copyin(arg, &pa32, sizeof (struct passargs32), mode);
		       pa.len = pa32.len;
		       pa.address = pa32.address;
		       break;
		   }
		   case DDI_MODEL_NONE:
		       ddi_copyin(arg, &pa, sizeof (struct passargs), mode);
		       break;
	       }

	       do_ioctl(&pa);
	       ....
       }

SEE ALSO

       ioctl(9E), mmap(9E), ddi_mmap_get_model(9F)

       Writing Device Drivers

SunOS 5.10							    8 Feb 2001						ddi_model_convert_from(9F)