Misc: Add a simple init process

This doesn't do much right now, just fork off a bunch of stuff and set priorities.

Kernel/init.cpp

@@ -26,15 +26,6 @@
 #include <Kernel/Net/NetworkTask.h>
 #include <Kernel/Devices/DebugLogDevice.h>
 
-#define SPAWN_TERMINAL
-#define SPAWN_LAUNCHER
-//#define SPAWN_GUITEST2
-//#define SPAWN_FILE_MANAGER
-//#define SPAWN_PROCESS_MANAGER
-//#define SPAWN_TEXT_EDITOR
-//#define SPAWN_FONTEDITOR
-//#define SPAWN_VISUAL_BUILDER
-//#define SPAWN_MULTIPLE_SHELLS
 //#define STRESS_TEST_SPAWNING
 
 VirtualConsole* tty0;
@@ -88,52 +79,12 @@ VFS* vfs;
 
     int error;
 
-    auto* dns_lookup_server_process = Process::create_user_process("/bin/LookupServer", (uid_t)100, (gid_t)100, (pid_t)0, error, { }, { }, tty0);
+    auto* system_server_process = Process::create_user_process("/bin/SystemServer", (uid_t)100, (gid_t)100, (pid_t)0, error, { }, { }, tty0);
     if (error != 0) {
-        dbgprintf("error spawning LookupServer: %d\n", error);
+        dbgprintf("error spawning SystemServer: %d\n", error);
         hang();
     }
-
-    auto* window_server_process = Process::create_user_process("/bin/WindowServer", (uid_t)100, (gid_t)100, (pid_t)0, error, { }, { }, tty0);
-    if (error != 0) {
-        dbgprintf("error spawning WindowServer: %d\n", error);
-        hang();
-    }
-    window_server_process->set_priority(Process::HighPriority);
-    Process::create_user_process("/bin/Taskbar", (uid_t)100, (gid_t)100, (pid_t)0, error);
-    //Process::create_user_process("/bin/sh", (uid_t)100, (gid_t)100, (pid_t)0, error, { }, move(environment), tty0);
-#ifdef SPAWN_TERMINAL
-    Process::create_user_process("/bin/Terminal", (uid_t)100, (gid_t)100, (pid_t)0, error, { }, { }, tty0);
-#endif
-#ifdef SPAWN_GUITEST2
-    Process::create_user_process("/bin/guitest2", (uid_t)100, (gid_t)100, (pid_t)0, error, { }, { }, tty0);
-#endif
-#ifdef SPAWN_LAUNCHER
-    Process::create_user_process("/bin/Launcher", (uid_t)100, (gid_t)100, (pid_t)0, error, { }, { }, tty0);
-#endif
-#ifdef SPAWN_VISUAL_BUILDER
-    Process::create_user_process("/bin/VisualBuilder", (uid_t)100, (gid_t)100, (pid_t)0, error, { }, { }, tty0);
-#endif
-#ifdef SPAWN_FILE_MANAGER
-    Process::create_user_process("/bin/FileManager", (uid_t)100, (gid_t)100, (pid_t)0, error, { }, { }, tty0);
-#endif
-#ifdef SPAWN_PROCESS_MANAGER
-    Process::create_user_process("/bin/ProcessManager", (uid_t)100, (gid_t)100, (pid_t)0, error, { }, { }, tty0);
-#endif
-#ifdef SPAWN_TEXT_EDITOR
-    Vector<String> text_editor_arguments;
-    text_editor_arguments.append("/bin/TextEditor");
-    text_editor_arguments.append("/home/anon/ReadMe.md");
-    Process::create_user_process("/bin/TextEditor", (uid_t)100, (gid_t)100, (pid_t)0, error, move(text_editor_arguments), { }, tty0);
-#endif
-#ifdef SPAWN_FONTEDITOR
-    Process::create_user_process("/bin/FontEditor", (uid_t)100, (gid_t)100, (pid_t)0, error, { }, move(environment), tty0);
-#endif
-#ifdef SPAWN_MULTIPLE_SHELLS
-    Process::create_user_process("/bin/sh", (uid_t)100, (gid_t)100, (pid_t)0, error, { }, { }, tty1);
-    Process::create_user_process("/bin/sh", (uid_t)100, (gid_t)100, (pid_t)0, error, { }, { }, tty2);
-    Process::create_user_process("/bin/sh", (uid_t)100, (gid_t)100, (pid_t)0, error, { }, { }, tty3);
-#endif
+    system_server_process->set_priority(Process::HighPriority);
 
 #ifdef STRESS_TEST_SPAWNING
     Process::create_kernel_process("spawn_stress", spawn_stress);

Kernel/makeall.sh

@@ -13,6 +13,7 @@ build_targets=""
 build_targets="$build_targets ../LibC"
 build_targets="$build_targets ../LibM"
 build_targets="$build_targets ../LibCore"
+build_targets="$build_targets ../Servers/SystemServer"
 build_targets="$build_targets ../Servers/LookupServer"
 build_targets="$build_targets ../Servers/WindowServer"
 build_targets="$build_targets ../LibGUI"

Kernel/sync.sh

@@ -63,6 +63,7 @@ cp -v ../Applications/TextEditor/TextEditor mnt/bin/TextEditor
 cp -v ../Applications/IRCClient/IRCClient mnt/bin/IRCClient
 ln -s IRCClient mnt/bin/irc
 ln -s FileManager mnt/bin/fm
+cp -v ../Servers/SystemServer/SystemServer mnt/bin/SystemServer
 cp -v ../Servers/LookupServer/LookupServer mnt/bin/LookupServer
 cp -v ../Servers/WindowServer/WindowServer mnt/bin/WindowServer
 cp -v ../Applications/Taskbar/Taskbar mnt/bin/Taskbar

Servers/SystemServer/Makefile

@@ -0,0 +1,23 @@
+include ../../Makefile.common
+
+SYSTEMSERVER_OBJS = \
+    main.o
+
+APP = SystemServer
+OBJS = $(SYSTEMSERVER_OBJS)
+
+DEFINES += -DUSERLAND
+
+all: $(APP)
+
+$(APP): $(OBJS)
+	$(LD) -o $(APP) $(LDFLAGS) $(OBJS) -lc -lcore
+
+.cpp.o:
+	@echo "CXX $<"; $(CXX) $(CXXFLAGS) -o $@ -c $<
+
+-include $(OBJS:%.o=%.d)
+
+clean:
+	@echo "CLEAN"; rm -f $(APP) $(OBJS) *.d
+

Servers/SystemServer/install.sh

@@ -0,0 +1,4 @@
+#!/bin/bash
+
+#mkdir -p ../../Root/usr/include/SystemServer/
+#cp *.h ../../Root/usr/include/SystemServer/

Servers/SystemServer/main.cpp

@@ -0,0 +1,63 @@
+#include <stdio.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <sched.h>
+#include <AK/Assertions.h>
+
+void start_process(const char *prog, int prio)
+{
+    pid_t pid = 0;
+
+    while (true) {
+        dbgprintf("Forking for %s...\n", prog);
+        int pid = fork();
+        if (pid < 0) {
+            dbgprintf("Fork %s failed! %s\n", prog, strerror(errno));
+            continue;
+        } else if (pid > 0) {
+            // parent...
+            dbgprintf("Process %s hopefully started with priority %d...\n", prog, prio);
+            return;
+        }
+        break;
+    }
+
+    while (true) {
+        if (pid == 0) {
+            dbgprintf("Executing for %s... at prio %d\n", prog, prio);
+            struct sched_param p;
+            p.sched_priority = prio;
+            int ret = sched_setparam(pid, &p);
+            ASSERT(ret == 0);
+
+            char* progv[256];
+            progv[0] = (char*)prog;
+            progv[1] = nullptr;
+            ret = execv(prog, progv);
+            if (ret < 0) {
+                dbgprintf("Exec %s failed! %s", prog, strerror(errno));
+                continue;
+            }
+            break;
+        } else {
+            break;
+        }
+    }
+}
+
+int main(int, char **)
+{
+    int lowest_prio = sched_get_priority_min(SCHED_OTHER);
+    int highest_prio = sched_get_priority_max(SCHED_OTHER);
+    start_process("/bin/LookupServer", lowest_prio);
+    start_process("/bin/WindowServer", highest_prio);
+    start_process("/bin/Taskbar", highest_prio);
+    start_process("/bin/Terminal", highest_prio-1);
+    start_process("/bin/Launcher", highest_prio);
+
+    while (1) {
+        sleep(1);
+    }
+}