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From: gballey <galley AT ace-co DOT com>
Subject:  lseek() returning Invalid Argument
Date:  Tue, 15 Sep 2009 17:43:00 -0500
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I'm getting an Invalid argument error from lseek(), but I can eliminate 
the error by preceding the lseek() statement with a particular printf() 
statement.

Configuration:
cygwin1.dll v1005.25.0.0
gcc v3.4.4
Windows XP SP3

Below is a short test program that illustrates the problem. As 
presented, the 2nd perror() statement is executed and prints the Invalid 
argument message (errno is 0). Removing the // from the printf() 
statement will cause the error to magically disappear.

I've tried substituting variations of printf() and sprintf() statements, 
as well as replacing the statement with a sleep(1) call, but at this 
point the only way to avoid the error is with the printf() statement shown.

Anyone got an idea of what is going on here?

Thanks.

/* begin test.c */

#include <fcntl.h>
#include <stdio.h>

static int mmfile ;

main(argc,argv)
int argc;
char *argv[];
{

	if ((mmfile = open("test.img", O_RDWR | O_CREAT, 0666)) == -1)
	{
		perror("open() error - ") ;
		exit(1) ;
	}

//	printf("mmfile=%d, length=%ld, where_at=%d\n", mmfile, 0x10000L, 
SEEK_SET) ;

	if (lseek(mmfile, 0x10000L, SEEK_SET) == -1)
	{
		perror("lseek() error - ") ;
		close(mmfile) ;
		exit(1) ;
	}
	close(mmfile) ;
         printf("ended successfully\n") ;
	exit(0) ;
}
/* end test.c */


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