| 1 | /* Test of sigaltstack wrappers. |
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| 2 | Copyright (C) 2019-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library 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 GNU |
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| 13 | Lesser 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 Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <support/xsignal.h> |
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| 20 | #include <support/support.h> |
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| 21 | #include <support/xunistd.h> |
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| 22 | #include <support/check.h> |
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| 23 | |
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| 24 | #include <stdint.h> |
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| 25 | #include <stdio.h> |
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| 26 | |
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| 27 | static volatile uintptr_t handler_stackaddr; |
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| 28 | |
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| 29 | static void |
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| 30 | handler (int unused) |
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| 31 | { |
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| 32 | int var; |
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| 33 | handler_stackaddr = (uintptr_t) &var; |
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| 34 | } |
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| 35 | |
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| 36 | int |
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| 37 | do_test (void) |
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| 38 | { |
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| 39 | void *sstk = xalloc_sigstack (size: 0); |
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| 40 | |
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| 41 | unsigned char *sp; |
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| 42 | size_t size; |
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| 43 | xget_sigstack_location (stack: sstk, addrp: &sp, sizep: &size); |
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| 44 | printf (format: "signal stack installed: sp=%p size=%zu\n" , sp, size); |
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| 45 | |
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| 46 | struct sigaction sa; |
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| 47 | sa.sa_handler = handler; |
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| 48 | sa.sa_flags = SA_RESTART | SA_ONSTACK; |
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| 49 | sigfillset (set: &sa.sa_mask); |
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| 50 | if (sigaction (SIGUSR1, act: &sa, oact: 0)) |
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| 51 | FAIL_RET ("sigaction (SIGUSR1, handler): %m\n" ); |
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| 52 | |
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| 53 | raise (SIGUSR1); |
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| 54 | |
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| 55 | uintptr_t haddr = handler_stackaddr; |
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| 56 | printf (format: "address of handler local variable: %p\n" , (void *)haddr); |
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| 57 | TEST_VERIFY ((uintptr_t)sp < haddr); |
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| 58 | TEST_VERIFY (haddr < (uintptr_t)sp + size); |
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| 59 | |
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| 60 | xfree_sigstack (stack: sstk); |
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| 61 | return 0; |
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| 62 | } |
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| 63 | |
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| 64 | #include <support/test-driver.c> |
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| 65 | |
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