| 1 | /* Stack overflow handling.
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| 2 |
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| 3 | Copyright (C) 2002, 2004, 2008-2021 Free Software Foundation, Inc.
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| 4 |
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| 5 | This program is free software: you can redistribute it and/or modify
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| 6 | it under the terms of the GNU General Public License as published by
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| 7 | the Free Software Foundation; either version 3 of the License, or
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| 8 | (at your option) any later version.
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| 9 |
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| 10 | This program is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | GNU General Public License for more details.
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| 14 |
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| 15 | You should have received a copy of the GNU General Public License
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| 16 | along with this program. If not, see <https://www.gnu.org/licenses/>. */
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| 17 |
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| 18 |
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| 19 | /* Set up ACTION so that it is invoked on C stack overflow and on other,
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| 20 | stack-unrelated, segmentation violation.
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| 21 | Return -1 (setting errno) if this cannot be done.
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| 22 |
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| 23 | When a stack overflow or segmentation violation occurs:
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| 24 | 1) ACTION is called. It is passed an argument equal to
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| 25 | - 0, for a stack overflow,
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| 26 | - SIGSEGV, for a segmentation violation that does not appear related
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| 27 | to stack overflow.
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| 28 | On many platforms the two cases are hard to distinguish; when in doubt,
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| 29 | zero is passed.
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| 30 | 2) If ACTION returns, a message is written to standard error, and the
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| 31 | program is terminated: in the case of stack overflow, with exit code
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| 32 | exit_failure (see "exitfail.h"), otherwise through a signal SIGSEGV.
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| 33 |
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| 34 | A null ACTION acts like an action that does nothing.
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| 35 |
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| 36 | Restrictions:
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| 37 | - ACTION must be async-signal-safe.
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| 38 | - ACTION together with its callees must not require more than 64 KiB of
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| 39 | stack space.
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| 40 | - ACTION must not create and then invoke nested functions
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| 41 | <https://gcc.gnu.org/onlinedocs/gcc/Nested-Functions.html>, because
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| 42 | this implementation does not guarantee an executable stack.
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| 43 | - ACTION should not call longjmp, because this implementation does not
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| 44 | guarantee that it is safe to return to the original stack.
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| 45 |
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| 46 | This function may install a handler for the SIGSEGV signal or for the SIGBUS
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| 47 | signal or exercise other system dependent exception handling APIs. */
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| 48 |
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| 49 | extern int c_stack_action (_GL_ASYNC_SAFE void (* /*action*/) (int));
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