jbw%bucsf.BU.EDU@BU-IT.BU.EDU (Joe Wells) (02/25/89)
The following happened to me on a Encore Multimax running UMAX 4.2.
When compiled with gcc, this ioctl call has different results than
when compiled with the system's cc (Greenhills CC). Can anyone
explain?
% gcc -v
gcc version 1.30
% cc -v
CC release: 02.01.r003
[barfing on no arguments deleted]
% cat check.c
#include <sys/ioctl.h>
main ()
{
int pgrp, rc;
extern int errno;
errno = 0;
rc = ioctl (2, TIOCGPGRP, (char *) &pgrp);
perror ("ioctl TIOCGPGRP");
printf ("rc: %d, errno: %d, pgrp: %d\n", rc, errno, pgrp);
}
% cc check.c
% a.out
ioctl TIOCGPGRP: Unknown error 0
rc: 0, errno: 0, pgrp: 27553
% gcc check.c
% a.out
ioctl TIOCGPGRP: Not a typewriter
rc: -1, errno: 25, pgrp: 1024
Weird, huh?
--
Joe Wells
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