Very Computer

by **spect..** » Thu, 03 Jun 1993 05:56:07

After opening Sun serial port /dev/ttyb with

if ((fd = open("/dev/ttyb", O_RDWR)) < 0) {
printf("Error opening /dev/ttyb, errno %d\n", errno);
}

which is successful, any attempt at an ioctl call, such as

ioctl(fd, TCGETA, &buf);

where buf is defined via

struct termio buf;

returns -1, with an errno of 25 (inappropriate ioctl for device). This
happens for all ioctl requests listed in the manual pages for termio(4).

I find this mightily puzzling. Any helpful comments?

Thanks in advance.

BJD Marrocco

by **Graeme G Love IE** » Fri, 04 Jun 1993 23:51:02

>After opening Sun serial port /dev/ttyb with

>which is successful, any attempt at an ioctl call, such as

> ioctl(fd, TCGETA, &buf);

>returns -1, with an errno of 25 (inappropriate ioctl for device). This
>happens for all ioctl requests listed in the manual pages for termio(4).

>BJD Marrocco

Are you using the gcc compiler. I had similar problems with ioctl() calls
when I used gcc but they all cleared up when I switched to cc. Apparently
there is some options flag which can be used with gcc to solve this sort
of problem (but I don't know what :-)

Hope this is of some help

Ttfn,

Graeme

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Very Computer

ioctl call for /dev/ttyb

ioctl call for /dev/ttyb

ioctl call for /dev/ttyb