Work on logging

kernel/include/logging.hpp

@@ -19,6 +19,7 @@ void finalize();
 void to_file();
 
 void log(const char* s);
+void logf(const char* s, ...);
 void log(const std::string& s);
 
 } //end of namespace logging

kernel/src/logging.cpp

@@ -7,6 +7,10 @@
 
 #include "logging.hpp"
 #include "assert.hpp"
+#include "vfs/vfs.hpp"
+
+#include <flags.hpp>
+#include <string.hpp>
 
 namespace {
 
@@ -18,6 +22,24 @@ constexpr const size_t MAX_EARLY = 128;
 size_t current_early = 0;
 const char* early_logs[MAX_EARLY];
 
+const char* new_line = "\n";
+
+void append_to_file(const char* s, size_t length){
+    auto fd = vfs::open("/messages", std::OPEN_CREATE);
+
+    if(fd >= 0){
+        stat_info info;
+        if(vfs::stat(fd, info) == 0){
+            if(vfs::truncate(fd, info.size + length + 1) == 0){
+                vfs::write(fd, s, length, info.size);
+                vfs::write(fd, new_line, 1, info.size + length);
+            }
+        }
+
+        vfs::close(fd);
+    }
+}
+
 } //end of anonymous namespace
 
 bool logging::is_early(){
@@ -29,37 +51,38 @@ bool logging::is_file(){
 }
 
 void logging::finalize(){
-    //Starting from there, the messages will be displayed on
-    //the screen
+    //Starting from there, the messages will be sent to the terminal
     early = false;
 }
 
 void logging::to_file(){
+    //Starting from there, the messages will be sent to the log file
     file = true;
-
-    //TODO
 }
 
 void logging::log(const char* s){
-    if(is_early()){
+    if(!is_early()){
+        //TODO Display the string in the kernel terminal
+    }
+
+    if(is_file()){
+        append_to_file(s, std::str_len(s));
+    } else {
         thor_assert(current_early < MAX_EARLY, "early log buffer is full");
 
         early_logs[current_early++] = s;
-    } else {
-        if(is_file()){
-            //TODO
-        } else {
-            //TODO
-        }
     }
 }
 
+void logging::logf(const char* s, ...){
+    //TODO
+}
+
 void logging::log(const std::string& s){
     thor_assert(!is_early(), "log(string) in only valid in normal mode");
+    thor_assert(is_file(), "log(string) in only valid file mode");
 
-    if(is_file()){
-        //TODO
-    } else {
-        //TODO
-    }
+    //TODO Display the string in the kernel terminal
+
+    append_to_file(s.c_str(), s.size());
 }

kernel/src/scheduler.cpp

@@ -25,6 +25,7 @@
 #include "physical_pointer.hpp"
 #include "mutex.hpp"
 #include "kernel_utils.hpp"
+#include "logging.hpp"
 
 constexpr const bool DEBUG_SCHEDULER = false;
 
@@ -594,6 +595,8 @@ void scheduler::init(){ //Create the idle task
 void scheduler::start(){
     started = true;
 
+    logging::log("Start multiprocessing");
+
     init_task_switch(current_pid);
 }
 
@@ -648,6 +651,8 @@ int64_t scheduler::exec(const std::string& file, const std::vector<std::string>&
         pcb[process.pid].working_directory.push_back(p);
     }
 
+    logging::logf("Exec process pid=%u, ppid=%u", process.pid, process.ppid);
+
     return process.pid;
 }