ptrace question

Hi, I wrote a small debugger using ptrace() (fork() child and parent is
tracing). And now i've a small problem. I limit memory for traced
process using setrlimit() (X MB) and then call execl(). But if traced
program use e.g global array of size bigger than X then linux kills it
with signal 127(???). So my debugger faults after first wait() call
(ptrace(PTRACE_PEEKUSER, child_pid, 4*ORIG_EAX) returns -1). How can i
check what happend (memory limit, smth. else) ?

.

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