02-20-2010
Quote:
Originally Posted by
Corona688
Memory related troubles within the pari stack will not cause inexplicable problems outside pari. To cause crashes in unrelated things, either the heap or the stack is getting mangled somewhere by something.
Then the problem was never with memory.
Quote:
Originally Posted by
Corona688
Less sarcastically, 'garbage on the stack' won't crash stdio or anything else programmed sensibly.
Of course. It is something I need to be concerned with, though -- most of my early programs with the library were unusable (crashed whenever run) by using up all of the stack.
Quote:
Originally Posted by
Corona688
If you're getting segfaults in senseless places, either your stack's being corrupted, or your heap.
No, no segfaults -- not now, not before.
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SIGSTACK(2) System Calls Manual SIGSTACK(2)
NAME
sigstack - set and/or get signal stack context
SYNOPSIS
#include <signal.h>
struct sigstack {
caddr_t ss_sp;
int ss_onstack;
};
sigstack(ss, oss);
struct sigstack *ss, *oss;
DESCRIPTION
Sigstack allows users to define an alternate stack on which signals are to be processed. If ss is non-zero, it specifies a signal stack on
which to deliver signals and tells the system if the process is currently executing on that stack. When a signal's action indicates its
handler should execute on the signal stack (specified with a sigvec(2) call), the system checks to see if the process is currently execut-
ing on that stack. If the process is not currently executing on the signal stack, the system arranges a switch to the signal stack for the
duration of the signal handler's execution. If oss is non-zero, the current signal stack state is returned.
NOTES
Signal stacks are not ``grown'' automatically, as is done for the normal stack. If the stack overflows unpredictable results may occur.
RETURN VALUE
Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and errno is set to indicate the error.
ERRORS
Sigstack will fail and the signal stack context will remain unchanged if one of the following occurs.
[EFAULT] Either ss or oss points to memory that is not a valid part of the process address space.
SEE ALSO
sigvec(2), setjmp(3)
4.2 Berkeley Distribution June 30, 1985 SIGSTACK(2)