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67 lines
2.3 KiB
C
67 lines
2.3 KiB
C
/* 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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int
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main (int argc, char **argv)
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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 (0, 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 (30); /* die if we don't finish in 30 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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