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authorEgor Tensin <Egor.Tensin@gmail.com>2020-03-24 00:43:34 +0300
committerEgor Tensin <Egor.Tensin@gmail.com>2020-03-24 00:48:16 +0300
commiteaf76a222e709f81e9d7c71b6c47ee172604af05 (patch)
treebf2fd37b9f5e4c6805d05be219d41d75156245cc /src
parentTravis: incremental Docker builds (diff)
downloadwinapi-debug-eaf76a222e709f81e9d7c71b6c47ee172604af05.tar.gz
winapi-debug-eaf76a222e709f81e9d7c71b6c47ee172604af05.zip
add Process class
It's intended to be used for the future dump writing functionality, to generate a meaningful file name, etc. Also, add Boost.Nowide, which provides handy UTF-8 conversion functions. I'm not sure about this, but things indicate that it's about to be included in Boost.
Diffstat (limited to 'src')
-rw-r--r--src/process.cpp120
1 files changed, 120 insertions, 0 deletions
diff --git a/src/process.cpp b/src/process.cpp
new file mode 100644
index 0000000..c2a32f4
--- /dev/null
+++ b/src/process.cpp
@@ -0,0 +1,120 @@
+#include "pdb/all.hpp"
+
+#include <boost/nowide/convert.hpp>
+
+#include <SafeInt.hpp>
+
+#include <windows.h>
+
+#include <stdexcept>
+#include <string>
+#include <utility>
+#include <vector>
+
+namespace pdb {
+namespace {
+
+// Permissions required for MiniDumpWriteDump.
+constexpr DWORD permissions = PROCESS_QUERY_INFORMATION | PROCESS_VM_READ;
+
+Handle open_process(DWORD id) {
+ Handle process{OpenProcess(permissions, FALSE, id)};
+ if (!process) {
+ throw error::windows(GetLastError());
+ }
+ return process;
+}
+
+class PathBuffer {
+public:
+ PathBuffer() : size{min_size} { data.resize(size); }
+
+ DWORD get_size() const { return size; }
+
+ wchar_t* get_data() { return data.data(); }
+
+ void grow() {
+ if (size < min_size) {
+ size = min_size;
+ } else {
+ if (!SafeMultiply(size, 2, size)) {
+ throw std::range_error{"couldn't allocate buffer sufficient for a file path"};
+ }
+ }
+ data.resize(size);
+ }
+
+private:
+ static constexpr DWORD min_size = 256;
+
+ DWORD size;
+ std::vector<wchar_t> data;
+};
+
+std::string get_current_executable_path(PathBuffer& buffer) {
+ SetLastError(ERROR_SUCCESS);
+
+ const auto ec = ::GetModuleFileNameW(NULL, buffer.get_data(), buffer.get_size());
+
+ if (ec == 0) {
+ throw error::windows(GetLastError());
+ }
+
+ if (ec == buffer.get_size() && GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
+ buffer.grow();
+ return get_current_executable_path(buffer);
+ }
+
+ return boost::nowide::narrow(buffer.get_data());
+}
+
+std::string get_current_executable_path() {
+ PathBuffer buffer;
+ return get_current_executable_path(buffer);
+}
+
+std::string get_executable_path(const Handle& process, PathBuffer& buffer) {
+ auto size = buffer.get_size();
+
+ const auto ec = ::QueryFullProcessImageNameW(process.get(), 0, buffer.get_data(), &size);
+
+ if (ec != 0) {
+ return boost::nowide::narrow(buffer.get_data());
+ }
+
+ if (GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
+ buffer.grow();
+ return get_executable_path(process, buffer);
+ }
+
+ throw error::windows(GetLastError());
+}
+
+std::string get_executable_path(const Handle& process) {
+ PathBuffer buffer;
+ return get_executable_path(process, buffer);
+}
+
+} // namespace
+
+Process Process::current() {
+ return Process{::GetCurrentProcessId(), Handle{::GetCurrentProcess()}};
+}
+
+Process Process::open(DWORD id) {
+ return Process{id, open_process(id)};
+}
+
+Process::Process(Handle&& handle) : Process{::GetProcessId(handle.get()), std::move(handle)} {}
+
+Process::Process(ID id, Handle&& handle) : id{id}, handle{std::move(handle)} {}
+
+std::string Process::get_executable_path() const {
+ if (handle.get() == ::GetCurrentProcess()) {
+ return pdb::get_current_executable_path();
+ } else {
+ return pdb::get_executable_path(handle);
+ }
+}
+
+} // namespace pdb