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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include "android-base/logging.h"
     18 #include "android-base/test_utils.h"
     19 
     20 #include <fcntl.h>
     21 #include <stdio.h>
     22 #include <stdlib.h>
     23 #include <sys/stat.h>
     24 #include <unistd.h>
     25 
     26 #if defined(_WIN32)
     27 #include <windows.h>
     28 #include <direct.h>
     29 #define OS_PATH_SEPARATOR '\\'
     30 #else
     31 #define OS_PATH_SEPARATOR '/'
     32 #endif
     33 
     34 #include <string>
     35 
     36 #ifdef _WIN32
     37 int mkstemp(char* template_name) {
     38   if (_mktemp(template_name) == nullptr) {
     39     return -1;
     40   }
     41   // Use open() to match the close() that TemporaryFile's destructor does.
     42   // Use O_BINARY to match base file APIs.
     43   return open(template_name, O_CREAT | O_EXCL | O_RDWR | O_BINARY,
     44               S_IRUSR | S_IWUSR);
     45 }
     46 
     47 char* mkdtemp(char* template_name) {
     48   if (_mktemp(template_name) == nullptr) {
     49     return nullptr;
     50   }
     51   if (_mkdir(template_name) == -1) {
     52     return nullptr;
     53   }
     54   return template_name;
     55 }
     56 #endif
     57 
     58 static std::string GetSystemTempDir() {
     59 #if defined(__ANDROID__)
     60   const char* tmpdir = "/data/local/tmp";
     61   if (access(tmpdir, R_OK | W_OK | X_OK) == 0) {
     62     return tmpdir;
     63   }
     64   // Tests running in app context can't access /data/local/tmp,
     65   // so try current directory if /data/local/tmp is not accessible.
     66   return ".";
     67 #elif defined(_WIN32)
     68   char tmp_dir[MAX_PATH];
     69   DWORD result = GetTempPathA(sizeof(tmp_dir), tmp_dir);
     70   CHECK_NE(result, 0ul) << "GetTempPathA failed, error: " << GetLastError();
     71   CHECK_LT(result, sizeof(tmp_dir)) << "path truncated to: " << result;
     72 
     73   // GetTempPath() returns a path with a trailing slash, but init()
     74   // does not expect that, so remove it.
     75   CHECK_EQ(tmp_dir[result - 1], '\\');
     76   tmp_dir[result - 1] = '\0';
     77   return tmp_dir;
     78 #else
     79   return "/tmp";
     80 #endif
     81 }
     82 
     83 TemporaryFile::TemporaryFile() {
     84   init(GetSystemTempDir());
     85 }
     86 
     87 TemporaryFile::TemporaryFile(const std::string& tmp_dir) {
     88   init(tmp_dir);
     89 }
     90 
     91 TemporaryFile::~TemporaryFile() {
     92   if (fd != -1) {
     93     close(fd);
     94   }
     95   unlink(path);
     96 }
     97 
     98 int TemporaryFile::release() {
     99   int result = fd;
    100   fd = -1;
    101   return result;
    102 }
    103 
    104 void TemporaryFile::init(const std::string& tmp_dir) {
    105   snprintf(path, sizeof(path), "%s%cTemporaryFile-XXXXXX", tmp_dir.c_str(),
    106            OS_PATH_SEPARATOR);
    107   fd = mkstemp(path);
    108 }
    109 
    110 TemporaryDir::TemporaryDir() {
    111   init(GetSystemTempDir());
    112 }
    113 
    114 TemporaryDir::~TemporaryDir() {
    115   rmdir(path);
    116 }
    117 
    118 bool TemporaryDir::init(const std::string& tmp_dir) {
    119   snprintf(path, sizeof(path), "%s%cTemporaryDir-XXXXXX", tmp_dir.c_str(),
    120            OS_PATH_SEPARATOR);
    121   return (mkdtemp(path) != nullptr);
    122 }
    123 
    124 CapturedStderr::CapturedStderr() : old_stderr_(-1) {
    125   init();
    126 }
    127 
    128 CapturedStderr::~CapturedStderr() {
    129   reset();
    130 }
    131 
    132 int CapturedStderr::fd() const {
    133   return temp_file_.fd;
    134 }
    135 
    136 void CapturedStderr::init() {
    137 #if defined(_WIN32)
    138   // On Windows, stderr is often buffered, so make sure it is unbuffered so
    139   // that we can immediately read back what was written to stderr.
    140   CHECK_EQ(0, setvbuf(stderr, NULL, _IONBF, 0));
    141 #endif
    142   old_stderr_ = dup(STDERR_FILENO);
    143   CHECK_NE(-1, old_stderr_);
    144   CHECK_NE(-1, dup2(fd(), STDERR_FILENO));
    145 }
    146 
    147 void CapturedStderr::reset() {
    148   CHECK_NE(-1, dup2(old_stderr_, STDERR_FILENO));
    149   CHECK_EQ(0, close(old_stderr_));
    150   // Note: cannot restore prior setvbuf() setting.
    151 }
    152