A quick update to this topic. As I alluded to in my original post,
the real issue is that the _syscall0 macro is not defined. Actually,
none of the _syscallx (where x goes from 0 to 6) macros are defined
in /usr/include/linux/unistd.h as they are on a CentOS 4.4 system. I
grep'ed in all of /usr/include and couldn't find any references to
these macros. Have they been deprecated or is this an oversight? At
least one man page (gettid) still references _syscall0...
Alfred
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