1 /* 2 * Copyright (C) 2009 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #ifndef ANDROID_NATIVETEST_SYSTEM_EXTRAS_TESTS_SDCARD_SYSUTIL_H_ 30 #define ANDROID_NATIVETEST_SYSTEM_EXTRAS_TESTS_SDCARD_SYSUTIL_H_ 31 32 #include <stdlib.h> 33 namespace android { 34 35 // Collection of functions to access the system: 36 // .kernelVersion Retrieve the full kernel description. 37 // .pidOutOfMemoryAdj Get and set the OOM adj value. 38 // .setPidOutOfMemoryAdj 39 // .schedFeatures Manipulate the scheduler using debugfs. 40 // .newFairSleepers 41 // .setNewFairSleepers 42 // .disableCpuScaling Set cpu scaling to 'performance'. 43 // .forkOrExit Fork a child or exit. 44 // .syncAnddropCaches Call sync an drop page/dentries/inodes caches. 45 // .fsyncAnddropCaches Call fsync an drop page/dentries/inodes caches. 46 // .resetDirectory Delete (non-recursive) files in a directory. 47 // 48 // IPC function to synchonize a processes with their parent. 49 // .writePidAndWaitForReply To instruct the parent the child is ready. 50 // Blocks until the parent signals back. 51 // .waitForChildrenAndSignal Blocks until all the children have called 52 // writePidAndWaitForReply. 53 // Then unblock all the children. 54 // .waitForChildrenOrExit Wait and exit if a child exit with errors. 55 // 56 57 // Minimum size for the buffer to retrieve the kernel version. 58 static const size_t kMinKernelVersionBufferSize = 256; 59 60 // @param str points to the buffer where the kernel version should be 61 // added. Must be at least kMinKernelVersionBufferSize chars. 62 // @param size of the buffer pointed by str. 63 // @return If successful the number of characters inserted in the 64 // buffer (not including the trailing '\0' byte). -1 otherwise. 65 int kernelVersion(char *str, size_t size); 66 67 68 // Return the out of memory adj for this process. /proc/<pid>/oom_adj. 69 // @return the oom_adj of the current process. Typically: 70 // 0: a regular process. Should die on OOM. 71 // -16: system_server level. 72 // -17: disable, this process will never be killed. 73 // -127: error. 74 int pidOutOfMemoryAdj(); 75 void setPidOutOfMemoryAdj(int level); 76 77 // Disable cpu scaling. 78 void disableCpuScaling(); 79 80 81 // Minimum size for the buffer to retrieve the sched features. 82 static const size_t kMinSchedFeaturesBufferSize = 256; 83 84 // @param str points to the buffer where the sched features should be 85 // added. Must be at least kMinSchedFeaturesBufferSize chars. 86 // @param size of the buffer pointed by str. 87 // @return If successful the number of characters inserted in the 88 // buffer (not including the trailing '\0' byte). -1 otherwise. 89 int schedFeatures(char *str, size_t size); 90 91 // @return true if NEW_FAIR_SLEEPERS is set, false if NO_NEW_FAIR_SLEEPERS is set. 92 bool newFairSleepers(); 93 94 // Turns NEW_FAIR_SLEEPERS on or off. 95 void setNewFairSleepers(bool on); 96 97 // @return true if NORMALIZED_SLEEPERS is set, false if NO_NORMALIZED_SLEEPERS is set. 98 bool normalizedSleepers(); 99 100 // Turns NORMALIZED_SLEEPERS on or off. 101 void setNormalizedSleepers(bool on); 102 103 // Filesystem 104 105 // Sync and drop caches. Sync is needed because dirty objects are not 106 // freable. 107 // @param code: 108 // * 1 To free pagecache. 109 // * 2 To free dentries and inodes. 110 // * 3 To free pagecache, dentries and inodes. 111 void syncAndDropCaches(int code = 3); 112 113 // Fsync the given fd and drop caches. Fsync is needed because dirty 114 // objects are not freable. 115 // @param code: 116 // * 1 To free pagecache. 117 // * 2 To free dentries and inodes. 118 // * 3 To free pagecache, dentries and inodes. 119 void fsyncAndDropCaches(int fd, int code = 3); 120 121 // Delete all the files in the given directory. If the directory does 122 // not exist, it is created. Use this at the beginning of a test to 123 // make sure you have a clean existing directory, previous run may 124 // have crashed and left clutter around. 125 void resetDirectory(const char *directory); 126 127 // IPC 128 129 // Try to fork. exit on failure. 130 pid_t forkOrExit(); 131 132 // Signal our parent we are alive and ready by sending our pid. 133 // Then do a blocking read for parent's reply. 134 bool writePidAndWaitForReply(int writefd, int readfd); 135 136 // Wait for all the children to report their pids. 137 // Then unblock them. 138 bool waitForChildrenAndSignal(int mProcessNb, int readfd, int writefd); 139 140 // Wait for 'num' children to complete. 141 // If a child did not exit cleanly, exit. 142 void waitForChildrenOrExit(int num); 143 144 } // namespace android 145 146 #endif // ANDROID_NATIVETEST_SYSTEM_EXTRAS_TESTS_SDCARD_SYSUTIL_H_ 147
