| /* libunwind - a platform-independent unwind library |
| Copyright (C) 2004 Hewlett-Packard Co |
| Contributed by David Mosberger-Tang <davidm@hpl.hp.com> |
| |
| This file is part of libunwind. |
| |
| Permission is hereby granted, free of charge, to any person obtaining |
| a copy of this software and associated documentation files (the |
| "Software"), to deal in the Software without restriction, including |
| without limitation the rights to use, copy, modify, merge, publish, |
| distribute, sublicense, and/or sell copies of the Software, and to |
| permit persons to whom the Software is furnished to do so, subject to |
| the following conditions: |
| |
| The above copyright notice and this permission notice shall be |
| included in all copies or substantial portions of the Software. |
| |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
| LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
| OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
| WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ |
| |
| /* This program creates lots of mappings such that on Linux the |
| reading of /proc/PID/maps gets very slow. With proper caching, |
| test-ptrace should still run at acceptable speed once |
| /proc/PID/maps has been scanned. If the program dies with a |
| SIGALRM, it means it was running unexpectedly slow. */ |
| |
| #include <signal.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| |
| #include <sys/mman.h> |
| |
| int |
| main (int argc, char **argv) |
| { |
| long n = 0; |
| |
| signal (SIGUSR1, SIG_IGN); |
| signal (SIGUSR2, SIG_IGN); |
| |
| printf ("Starting mmap test...\n"); |
| for (n = 0; n < 30000; ++n) |
| { |
| if (mmap (0, 1, (n & 1) ? PROT_READ : PROT_WRITE, |
| MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE, |
| -1, 0) == MAP_FAILED) |
| { |
| printf ("Failed after %ld successful maps\n", n - 1); |
| exit (0); |
| } |
| } |
| |
| alarm (30); /* die if we don't finish in 30 seconds */ |
| |
| printf ("Turning on single-stepping...\n"); |
| kill (getpid (), SIGUSR1); /* tell test-ptrace to start single-stepping */ |
| printf ("Va bene?\n"); |
| kill (getpid (), SIGUSR2); /* tell test-ptrace to stop single-stepping */ |
| printf ("Turned single-stepping off...\n"); |
| return 0; |
| } |