Mail Archives: cygwin/2009/09/15/18:45:20
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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