From 048d28b28dcaba3b0773c129d8dd63084420b01e Mon Sep 17 00:00:00 2001
From: Nicolas James <Eele1Ephe7uZahRie@tutanota.com>
Date: Thu, 13 Feb 2025 17:29:05 +1100
Subject: initial commit

---
 src/memory/maps.cc | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 src/memory/maps.cc

(limited to 'src/memory/maps.cc')

diff --git a/src/memory/maps.cc b/src/memory/maps.cc
new file mode 100644
index 0000000..290675a
--- /dev/null
+++ b/src/memory/maps.cc
@@ -0,0 +1,60 @@
+#include "memory/maps.hh"
+
+namespace memory {
+
+static std::string get_pid_from_name(const std::string& name) {
+    for (const auto& pid : std::filesystem::directory_iterator("/proc")) {
+        if (!pid.is_directory()) {
+            continue;
+        }
+
+        std::ifstream file{std::string{pid.path()} + "/comm"};
+        if (!file.is_open()) {
+            continue;
+        }
+        const std::string contents{std::istreambuf_iterator<char>{file},
+                                   std::istreambuf_iterator<char>{}};
+        if (!contents.starts_with(name)) {
+            continue;
+        }
+
+        const std::string pathname = pid.path();
+        const auto pos = static_cast<long>(pathname.find_last_of('/'));
+        return {std::next(std::begin(pathname) + pos), std::end(pathname)};
+    }
+
+    throw std::runtime_error{"failed to get pid from name \"" + name +
+                             "\", is it open?"};
+}
+
+maps::maps(const char* const name) : pid(get_pid_from_name(name)) {
+    std::ifstream file{"/proc/" + this->pid + "/maps"};
+    if (!file.is_open()) {
+        throw std::runtime_error{"failed to open maps for pid \"" + this->pid +
+                                 '\"'};
+    }
+    std::stringstream file_ss;
+    file_ss << file.rdbuf();
+    for (std::string line; std::getline(file_ss, line);) {
+        if (line.empty()) {
+            continue;
+        }
+
+        std::stringstream line_ss{line};
+
+        // address           perms offset  dev   inode       pathname
+        // 00400000-00452000 r-xp 00000000 08:02 173521      /usr/bin/dbus-daemon
+        maps::region region;
+        line_ss >> region.start;
+        line_ss.ignore(); // ignore dash
+        line_ss >> region.end;
+        line_ss >> region.perms;
+        line_ss >> region.offset;
+        line_ss >> region.dev;
+        line_ss >> region.inode;
+        line_ss >> region.pathname;
+        this->regions.push_back(std::move(region));
+    }
+}
+
+} // namespace memory
-- 
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