Unix syscall under the Hurd

[Brent Fulgham <bfulgham@debian.org>]

The MzScheme software package makes use of the UNIX
"syscall" function.  

Generally, "bits/syscall.h" includes defines like:

#define SYS_read  __NR_read

...and "asm/unistd.h" includes defines like

#define __NR_read	3

But under the Hurd, these defines are not available.
I assume they probably map 1:1 with the Linux
variety, but the fact that they are not present makes
me somewhat concerned that there may be more going on
than I am aware of.

Can someone comment on the availability of these syscall
mappings?

Thanks,

-Brent