1 // Copyright (c) 2012, Google Inc. 2 // All rights reserved. 3 // 4 // Redistribution and use in source and binary forms, with or without 5 // modification, are permitted provided that the following conditions are 6 // met: 7 // 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 11 // copyright notice, this list of conditions and the following disclaimer 12 // in the documentation and/or other materials provided with the 13 // distribution. 14 // * Neither the name of Google Inc. nor the names of its 15 // contributors may be used to endorse or promote products derived from 16 // this software without specific prior written permission. 17 // 18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 30 // mkdtemp() wasn't declared in <stdlib.h> until NDK r9b due to a simple 31 // packaging bug (the function has always been implemented in all versions 32 // of the C library). This header is provided to build Breakpad with earlier 33 // NDK revisions (e.g. the one used by Chromium). It may be removed in the 34 // future once all major projects upgrade to use a more recent NDK. 35 // 36 // The reason this is inlined here is to avoid linking a new object file 37 // into each unit test program (i.e. keep build files simple). 38 39 #ifndef GOOGLE_BREAKPAD_COMMON_ANDROID_TESTING_MKDTEMP_H 40 #define GOOGLE_BREAKPAD_COMMON_ANDROID_TESTING_MKDTEMP_H 41 42 #include <assert.h> 43 #include <errno.h> 44 #include <stdlib.h> 45 #include <stdio.h> 46 #include <string.h> 47 #include <sys/stat.h> 48 49 // Using a macro renaming trick here is necessary when building against 50 // NDK r9b. Otherwise the compiler will complain that calls to mkdtemp() 51 // are ambiguous. 52 #define mkdtemp breakpad_mkdtemp 53 54 namespace { 55 56 char* breakpad_mkdtemp(char* path) { 57 if (path == NULL) { 58 errno = EINVAL; 59 return NULL; 60 } 61 62 // 'path' must be terminated with six 'X' 63 const char kSuffix[] = "XXXXXX"; 64 const size_t kSuffixLen = strlen(kSuffix); 65 char* path_end = path + strlen(path); 66 67 if (static_cast<size_t>(path_end - path) < kSuffixLen || 68 memcmp(path_end - kSuffixLen, kSuffix, kSuffixLen) != 0) { 69 errno = EINVAL; 70 return NULL; 71 } 72 73 // If 'path' contains a directory separator, check that it exists to 74 // avoid looping later. 75 char* sep = strrchr(path, '/'); 76 if (sep != NULL) { 77 struct stat st; 78 int ret; 79 *sep = '\0'; // temporarily zero-terminate the dirname. 80 ret = stat(path, &st); 81 *sep = '/'; // restore full path. 82 if (ret < 0) 83 return NULL; 84 if (!S_ISDIR(st.st_mode)) { 85 errno = ENOTDIR; 86 return NULL; 87 } 88 } 89 90 // Loop. On each iteration, replace the XXXXXX suffix with a random 91 // number. 92 int tries; 93 for (tries = 128; tries > 0; tries--) { 94 int random = rand() % 1000000; 95 96 snprintf(path_end - kSuffixLen, kSuffixLen + 1, "%0d", random); 97 if (mkdir(path, 0700) == 0) 98 return path; // Success 99 100 if (errno != EEXIST) 101 return NULL; 102 } 103 104 assert(errno == EEXIST); 105 return NULL; 106 } 107 108 } // namespace 109 110 #endif // GOOGLE_BREAKPAD_COMMON_ANDROID_TESTING_MKDTEMP_H 111
