utils.h revision d0b5c3ad65accd2c0298edbdfd527ede63e68ba1 
1/*
2 * Copyright (C) 2012 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#ifndef __TEST_UTILS_H
18#define __TEST_UTILS_H
19
20#include <inttypes.h>
21#include <sys/mman.h>
22#include <sys/types.h>
23#include <sys/wait.h>
24#include <unistd.h>
25
26#include <atomic>
27#include <string>
28#include <regex>
29
30#include <android-base/file.h>
31#include <android-base/stringprintf.h>
32
33#include "private/ScopeGuard.h"
34
35#if defined(__linux__)
36
37struct map_record {
38  uintptr_t addr_start;
39  uintptr_t addr_end;
40
41  int perms;
42
43  size_t offset;
44
45  dev_t device;
46  ino_t inode;
47
48  std::string pathname;
49};
50
51class Maps {
52 public:
53  static bool parse_maps(std::vector<map_record>* maps) {
54    FILE* fp = fopen("/proc/self/maps", "re");
55    if (fp == nullptr) {
56      return false;
57    }
58
59    auto fp_guard = make_scope_guard([&]() {
60      fclose(fp);
61    });
62
63    char line[BUFSIZ];
64    while (fgets(line, sizeof(line), fp) != nullptr) {
65      map_record record;
66      uint32_t dev_major, dev_minor;
67      int path_offset;
68      char prot[5]; // sizeof("rwxp")
69      if (sscanf(line, "%" SCNxPTR "-%" SCNxPTR " %4s %" SCNxPTR " %x:%x %lu %n",
70            &record.addr_start, &record.addr_end, prot, &record.offset,
71            &dev_major, &dev_minor, &record.inode, &path_offset) == 7) {
72        record.perms = 0;
73        if (prot[0] == 'r') {
74          record.perms |= PROT_READ;
75        }
76        if (prot[1] == 'w') {
77          record.perms |= PROT_WRITE;
78        }
79        if (prot[2] == 'x') {
80          record.perms |= PROT_EXEC;
81        }
82
83        // TODO: parse shared/private?
84
85        record.device = makedev(dev_major, dev_minor);
86        record.pathname = line + path_offset;
87        if (!record.pathname.empty() && record.pathname.back() == '\n') {
88          record.pathname.pop_back();
89        }
90        maps->push_back(record);
91      }
92    }
93
94    return true;
95  }
96};
97
98extern "C" pid_t gettid();
99
100#endif
101
102static inline void WaitUntilThreadSleep(std::atomic<pid_t>& tid) {
103  while (tid == 0) {
104    usleep(1000);
105  }
106  std::string filename = android::base::StringPrintf("/proc/%d/stat", tid.load());
107  std::regex regex {R"(\s+S\s+)"};
108
109  while (true) {
110    std::string content;
111    ASSERT_TRUE(android::base::ReadFileToString(filename, &content));
112    if (std::regex_search(content, regex)) {
113      break;
114    }
115    usleep(1000);
116  }
117}
118
119static inline void AssertChildExited(int pid, int expected_exit_status) {
120  int status;
121  ASSERT_EQ(pid, waitpid(pid, &status, 0));
122  ASSERT_TRUE(WIFEXITED(status));
123  ASSERT_EQ(expected_exit_status, WEXITSTATUS(status));
124}
125
126// The absolute path to the executable
127const std::string& get_executable_path();
128
129// Get realpath
130bool get_realpath(const std::string& path, std::string* realpath);
131// Get dirname
132std::string get_dirname(const char* path);
133
134// Access to argc/argv/envp
135int get_argc();
136char** get_argv();
137char** get_envp();
138
139#endif
140