pseudodevices: initial null, zero and full implementations

src/arch/x86_64/main.c

@@ -63,6 +63,8 @@ void kmain(){
 	
 	consoledev_init();
 
+	pseudodevs_init();
+
 	pci_enumerate();
 
 	cpu_state_init();
@@ -74,7 +76,7 @@ void kmain(){
 	keyboard_init();
 
 	ps2kbd_init();
-
+	
 	sched_runinit();
 
 	_panic("End of kmain()", 0);

src/include/kernel/devman.h

@@ -3,6 +3,10 @@
 
 #include <sys/stat.h>
 
+#define MAJOR_CONSOLE 1
+#define MAJOR_ZERO 2
+#define MAJOR_NULL 3
+#define MAJOR_FULL 4
 
 typedef struct{
 	int (*read)(int* error, int minor, void* buff, size_t count, size_t offset);

src/sys/Makefile

@@ -1,5 +1,5 @@
 objects := $(patsubst %.c,%.o,$(wildcard *.c))
-subdirs := mm sched syscalls
+subdirs := mm sched syscalls pseudodevs
 OBJPATH=$(OBJDIR)
 export
 

src/sys/pseudodevs/Makefile

@@ -0,0 +1,12 @@
+objects := $(patsubst %.c,%.o,$(wildcard *.c))
+subdirs := 
+OBJPATH=$(OBJDIR)
+export
+
+all: $(subdirs) $(objects)
+	for subdir in $(subdirs) ; do $(MAKE) -C $${subdir} ; done
+
+%.o: %.c
+	$(CC) $(CFLAGS) -o $@ $<
+	mkdir -p $(OBJPATH) 
+	cp $@ $(OBJPATH)/$@

src/sys/pseudodevs/full.c

@@ -0,0 +1,28 @@
+#include <kernel/devman.h>
+#include <errno.h>
+#include <string.h>
+#include <arch/panic.h>
+
+static int read(int* error, int minor, void* buff, size_t count, size_t offset){
+	*error = 0;
+	memset(buff, 0, count);
+	return count;
+}
+static int write(int* error, int minor, void* buff, size_t count, size_t offset){
+	*error = ENOSPC;
+	return -1;
+}
+
+static int isatty(int minor){
+	return ENOTTY;
+}
+
+static devcalls calls = {
+	read, write, isatty
+};
+
+void fulldev_init(){
+	if(devman_newdevice("full", TYPE_CHARDEV, MAJOR_FULL, 0, &calls)){
+		_panic("/dev/full init failed", NULL);
+	}
+}

src/sys/pseudodevs/null.c

@@ -0,0 +1,27 @@
+#include <kernel/devman.h>
+#include <errno.h>
+#include <string.h>
+#include <arch/panic.h>
+
+static int read(int* error, int minor, void* buff, size_t count, size_t offset){
+	*error = 0;
+	return 0;
+}
+static int write(int* error, int minor, void* buff, size_t count, size_t offset){
+	*error = 0;
+	return count;
+}
+
+static int isatty(int minor){
+	return ENOTTY;
+}
+
+static devcalls calls = {
+	read, write, isatty
+};
+
+void nulldev_init(){
+	if(devman_newdevice("null", TYPE_CHARDEV, MAJOR_NULL, 0, &calls)){
+		_panic("/dev/null init failed", NULL);
+	}
+}

src/sys/pseudodevs/pseudodevs.c

@@ -0,0 +1,11 @@
+
+void nulldev_init();
+void zerodev_init();
+void fulldev_init();
+
+void pseudodevs_init(){
+	
+	nulldev_init();
+	zerodev_init();
+	fulldev_init();
+}

src/sys/pseudodevs/zero.c

@@ -0,0 +1,28 @@
+#include <kernel/devman.h>
+#include <errno.h>
+#include <string.h>
+#include <arch/panic.h>
+
+static int read(int* error, int minor, void* buff, size_t count, size_t offset){
+	*error = 0;
+	memset(buff, 0, count);
+	return count;
+}
+static int write(int* error, int minor, void* buff, size_t count, size_t offset){
+	*error = 0;
+	return count;
+}
+
+static int isatty(int minor){
+	return ENOTTY;
+}
+
+static devcalls calls = {
+	read, write, isatty
+};
+
+void zerodev_init(){
+	if(devman_newdevice("zero", TYPE_CHARDEV, MAJOR_ZERO, 0, &calls)){
+		_panic("/dev/zero init failed", NULL);
+	}
+}

src/video/consoledev.c

@@ -8,8 +8,6 @@
 #include <arch/interrupt.h>
 #include <arch/spinlock.h>
 
-#define CONSOLE_MAJOR 1
-
 static ringbuffer_t input;
 static thread_t* thread;
 static event_t outputevent;
@@ -129,7 +127,7 @@ devcalls calls = {
 
 void consoledev_init(){
 	
-	if(devman_newdevice("console", TYPE_CHARDEV, CONSOLE_MAJOR, 0, &calls))
+	if(devman_newdevice("console", TYPE_CHARDEV, MAJOR_CONSOLE, 0, &calls))
 	_panic("Failed to create console device", 0);
 
 	if(ringbuffer_init(&input, THREAD_BUFF_MAX))