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/* Stack overflow handling.
Copyright (C) 2002, 2004, 2008-2021 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Set up ACTION so that it is invoked on C stack overflow and on other,
stack-unrelated, segmentation violation.
Return -1 (setting errno) if this cannot be done.
When a stack overflow or segmentation violation occurs:
1) ACTION is called. It is passed an argument equal to
- 0, for a stack overflow,
- SIGSEGV, for a segmentation violation that does not appear related
to stack overflow.
On many platforms the two cases are hard to distinguish; when in doubt,
zero is passed.
2) If ACTION returns, a message is written to standard error, and the
program is terminated: in the case of stack overflow, with exit code
exit_failure (see "exitfail.h"), otherwise through a signal SIGSEGV.
A null ACTION acts like an action that does nothing.
Restrictions:
- ACTION must be async-signal-safe.
- ACTION together with its callees must not require more than 64 KiB of
stack space.
- ACTION must not create and then invoke nested functions
<https://gcc.gnu.org/onlinedocs/gcc/Nested-Functions.html>, because
this implementation does not guarantee an executable stack.
- ACTION should not call longjmp, because this implementation does not
guarantee that it is safe to return to the original stack.
This function may install a handler for the SIGSEGV signal or for the SIGBUS
signal or exercise other system dependent exception handling APIs. */
extern int c_stack_action (_GL_ASYNC_SAFE void (* /*action*/) (int));
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