Small and flat memory models for ioctl calls.

QNX Newsgroups (Archives) qnx.qnx4
1

Hi,

I attach a piece of code making an ioctl call. It works when
compiled:

cc -ms ioctl_test.c

but not when compiled:

cc ioctl_test.c

giving the error message:

ioctl error 14,Bad address

A test file needed for the test was created:

echo “hi” > test.txt

Does anyone know why it doesn’t work when compiled with the
flat memory model?

— file: ioctl_test.c

#include <ioctl.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

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

int fd;

if((fd = open(“test.txt”,O_RDWR)) == -1)
{
printf(“open error\n”);
exit (-1);
}
if(ioctl(fd,FIONBIO,(char *)1) < 0)
{
printf(“ioctl error %d,%s\n”,errno,strerror(errno));
exit (-1);
}

printf(“finished successfully\n”);

return 0 ;
}

–

Regards,
Peter Engstrom

Replace engineering with eng to get the correct mail address.

2

“Peter Engstrom” <petere@prisma-engineering.it> wrote in message
news:6xy8i4mh17.fsf@lino.prisma…

Hi,

I attach a piece of code making an ioctl call. It works when
compiled:

cc -ms ioctl_test.c

but not when compiled:

cc ioctl_test.c

giving the error message:

ioctl error 14,Bad address

A test file needed for the test was created:

echo “hi” > test.txt

Does anyone know why it doesn’t work when compiled with the
flat memory model?

— file: ioctl_test.c

#include <ioctl.h
#include <stdio.h
#include <errno.h
#include <stdlib.h
#include <sys/types.h
#include <sys/stat.h
#include <fcntl.h

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

int fd;

if((fd = open(“test.txt”,O_RDWR)) == -1)
{
printf(“open error\n”);
exit (-1);
}
if(ioctl(fd,FIONBIO,(char *)1) < 0)

FIONBIO macro specifies that the argument should be a short ( 2 bytes) and
not a pointer (4 bytes) like you are specifying.


{
printf(“ioctl error %d,%s\n”,errno,strerror(errno));
exit (-1);
}

printf(“finished successfully\n”);

return 0 ;
}

–

Regards,
Peter Engstrom

Replace engineering with eng to get the correct mail address.