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71 lines
2.4 KiB
71 lines
2.4 KiB
/* libunwind - a platform-independent unwind library |
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Copyright (C) 2004 Hewlett-Packard Co |
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Contributed by David Mosberger-Tang <davidm@hpl.hp.com> |
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This file is part of libunwind. |
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Permission is hereby granted, free of charge, to any person obtaining |
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a copy of this software and associated documentation files (the |
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"Software"), to deal in the Software without restriction, including |
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without limitation the rights to use, copy, modify, merge, publish, |
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distribute, sublicense, and/or sell copies of the Software, and to |
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permit persons to whom the Software is furnished to do so, subject to |
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the following conditions: |
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The above copyright notice and this permission notice shall be |
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included in all copies or substantial portions of the Software. |
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ |
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/* This program creates lots of mappings such that on Linux the |
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reading of /proc/PID/maps gets very slow. With proper caching, |
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test-ptrace should still run at acceptable speed once |
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/proc/PID/maps has been scanned. If the program dies with a |
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SIGALRM, it means it was running unexpectedly slow. */ |
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#include <signal.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <unistd.h> |
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#include <sys/mman.h> |
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#if !defined(MAP_ANONYMOUS) && defined(MAP_ANON) |
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# define MAP_ANONYMOUS MAP_ANON |
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#endif |
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int |
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main (void) |
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{ |
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long n = 0; |
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signal (SIGUSR1, SIG_IGN); |
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signal (SIGUSR2, SIG_IGN); |
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printf ("Starting mmap test...\n"); |
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for (n = 0; n < 30000; ++n) |
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{ |
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if (mmap (NULL, 1, (n & 1) ? PROT_READ : PROT_WRITE, |
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MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE, |
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-1, 0) == MAP_FAILED) |
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{ |
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printf ("Failed after %ld successful maps\n", n - 1); |
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exit (0); |
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} |
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} |
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alarm (80); /* die if we don't finish in 80 seconds */ |
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printf ("Turning on single-stepping...\n"); |
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kill (getpid (), SIGUSR1); /* tell test-ptrace to start single-stepping */ |
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printf ("Va bene?\n"); |
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kill (getpid (), SIGUSR2); /* tell test-ptrace to stop single-stepping */ |
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printf ("Turned single-stepping off...\n"); |
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return 0; |
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}
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