serial programming HOWTO
Christopher Faylor
cygwin@cygwin.com
Sun Nov 12 12:35:00 GMT 2000
On Sun, Nov 12, 2000 at 09:24:12PM +0100, Frank Wagner wrote:
>I encountered something confusing.
>This part of c-sourccode is from the asynchronous input example included
>in the serial programming HOWTO document:
>
> /* install the signal handler before making the device asynchronous */
> saio.sa_handler = signal_handler_IO;
> saio.sa_mask = 0;
> saio.sa_flags = 0;
> saio.sa_restorer = NULL;
> sigaction(SIGIO,&saio,NULL);
>
>I tried to compile this example under Win95 with cygwin and got the
>following error:
>
> ! program.c:41: structure has no member named `sa_restorer'
>
>OK. There was no declaration of "sa_restorer" in the file /sys/signal.h.
>Why?
>From the linux man page:
"The sa_restorer element is obsolete and should not be
used."
It's also not mentioned in the Single UNIX Specification.
>After that I tried to compile that example under Linux and got the
>follwing error message
>
>program.c: 39 incompatible types in assignment --dir=.
>
>that refers to the folloing line of the source:
>
> saio.sa_mask = 0;
>
>Why do I get a error message form an example that is written for linux?
Because cygwin is not linux? The above use of saio.sa_mask is
incorrect. You should be using sigemptyset() to clear the mask. This
will also work on linux.
cgf
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