Kernel: Expose process executable paths in /proc/all

Kernel/FileSystem/ProcFS.cpp

@@ -872,6 +872,7 @@ static OwnPtr<KBuffer> procfs$all(InodeIdentifier)
         process_object.add("ppid", process.ppid().value());
         process_object.add("nfds", process.number_of_open_file_descriptors());
         process_object.add("name", process.name());
+        process_object.add("executable", process.executable() ? process.executable()->absolute_path() : "");
         process_object.add("tty", process.tty() ? process.tty()->tty_name() : "notty");
         process_object.add("amount_virtual", process.amount_virtual());
         process_object.add("amount_resident", process.amount_resident());

Kernel/Process.h

@@ -391,10 +391,8 @@ public:
     u32 m_ticks_in_kernel_for_dead_children { 0 };
 
     Custody& current_directory();
-    Custody* executable()
-    {
-        return m_executable.ptr();
-    }
+    Custody* executable() { return m_executable.ptr(); }
+    const Custody* executable() const { return m_executable.ptr(); }
 
     int number_of_open_file_descriptors() const;
     int max_open_file_descriptors() const

Libraries/LibCore/ProcessStatisticsReader.cpp

@@ -64,6 +64,7 @@ HashMap<pid_t, Core::ProcessStatistics> ProcessStatisticsReader::get_all()
         process.ppid = process_object.get("ppid").to_u32();
         process.nfds = process_object.get("nfds").to_u32();
         process.name = process_object.get("name").to_string();
+        process.executable = process_object.get("executable").to_string();
         process.tty = process_object.get("tty").to_string();
         process.pledge = process_object.get("pledge").to_string();
         process.veil = process_object.get("veil").to_string();

Libraries/LibCore/ProcessStatisticsReader.h

@@ -66,6 +66,7 @@ struct ProcessStatistics {
     pid_t ppid;
     unsigned nfds;
     String name;
+    String executable;
     String tty;
     String pledge;
     String veil;