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From:	"David Ayliffe" <me AT ayliffe DOT com>
To:	<cygwin AT cygwin DOT com>
Subject:	Probably a very simple problem - hopefully someone will help me
Date:	Sun, 22 Jul 2001 21:51:07 +0100
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Hello and thanks for your time.
I have been subscribed to this list now for 1824 posts but this is my
first post.
I have a file (attached) which I can't compile under cygwin using gcc.
Is it possible for this file to be compiled using cygwin, and if so can
you point me to where I am going wrong?  Sorry if this is a REALLY dolly
question but we all start somewhere.  PS This code compiles fine under
VC6.

I get these errors when I compile using the command directly below

$ gcc byte_hacking.cpp
byte_hacking.cpp: In function 'int main():
byte_hacking.cpp:20 implicit declaration of function 'int lseek(...)'
byte_hacking.cpp:22 implicit declaration of function 'int read(...)'
byte_hacking.cpp:27 implicit declaration of function 'int write(...)'
byte_hacking.cpp:25 implicit declaration of function 'int close(...)'

Thanks lots
David Ayliffe (mail AT ayliffe DOT com)

Running Windows 2000 Advanced Server (SP2) with Cygwin gcc 2.95.3-5
Also running Suse Linux 7.1 Professional kernel 2.4








<ATTATCHED CODE FOR THOSE WHO CANT BE BOTHERED TO OPEN THE ATTACHMENT>
//Gets records from a MS Access Database

#include <io.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys\stat.h>

//#define database = northwind.mdb;

int main ()
{
	int f,buf;
	int isuccess = 0;

	printf ("Lists records in database\n");
	printf ("**************************\n\n");
	if (chmod("northwind.mdb",S_IWRITE)!=-1 && (f=open
("northwind.mdb",O_RDWR | O_BINARY))!=-1) 
	{
			 //handle, offest, origin

		if (lseek (f,0,SEEK_SET)!=1) 
		{
			if (read (f,&buf,2)==2 && buf==0x037D) 
			{
				printf ("Reading records");
				lseek (f,346345,SEEK_SET);
				buf=0x9090; //nop nop
				if (write(f,&buf,2)==2)  
				{	
					printf ("Success.");
				}
				else 
				{
					printf ("Failed due to unknown
reason.");
				}
			} 
			else 
			{			
				printf("Cannot find start location.
File may not be .mdb file");
			}
		} 
		else 
		{
			printf("Seek error.");
		}
		close(f);
    } 
	else 
	{
		printf ("Cannot find northwind.mdb");
	}
	return isuccess;
}

<END OF ATTATCHED CODE FOR THOSE WHO CANT BE BOTHERED TO OPEN THE
ATTACHMENT>

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Content-Type: application/octet-stream;
	name="byte_hacking.cpp"
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Content-Disposition: attachment;
	filename="byte_hacking.cpp"

//Gets records from a MS Access Database

#include <io.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys\stat.h>

#define database =3D northwind.mdb;

int main ()
{
	int f,buf;
	int isuccess =3D 0;

	printf ("Lists records in database\n");
	printf ("**************************\n\n");
	if (chmod("northwind.mdb",S_IWRITE)!=3D-1 && (f=3Dopen =
("northwind.mdb",O_RDWR | O_BINARY))!=3D-1)=20
	{
			 //handle, offest, origin			=09
		if (lseek (f,0,SEEK_SET)!=3D1)=20
		{
			if (read (f,&buf,2)=3D=3D2 && buf=3D=3D0x037D)=20
			{
				printf ("Reading records");
				lseek (f,346345,SEEK_SET);
				buf=3D0x9090; //nop nop
				if (write(f,&buf,2)=3D=3D2) =20
				{=09
					printf ("Success.");
				}
				else=20
				{
					printf ("Failed due to unknown reason.");
				}
			}=20
			else=20
			{		=09
				printf("Cannot find start location.  File may not be .mdb file");
			}
		}=20
		else=20
		{
			printf("Seek error.");
		}
		close(f);
    }=20
	else=20
	{
		printf ("Cannot find northwind.mdb");
	}
	return isuccess;
}

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