Processes: System continues to work if error (fault) occured.

Syscalls: Add writing functionality

kernel/include/sys/file_descriptors.h

@@ -12,8 +12,9 @@ struct fd_info {
 };
 
 void file_descriptors_init();
-void file_descriptor_allocate(const char *filename, const char *mode, int *out);
+void file_descriptor_allocate(const char *filename, size_t mode, int *out);
 void file_descriptor_read(int descriptor_number, size_t count, void* buffer);
+void file_descriptor_write(int descriptor_number, size_t count, const void* buffer);
 void file_descriptor_close(int descriptor_number);
 void file_descriptor_seek(int descriptor_number, ssize_t value, size_t whence);
-void file_descriptor_tell(int descriptor_number, int* out);
+void file_descriptor_tell(int descriptor_number, int* out);

kernel/include/sys/syscalls.h

@@ -7,7 +7,7 @@
 
 typedef size_t syscall_fn_t (size_t, size_t, size_t);
 
-#define		NUM_CALLS	19
+#define		NUM_CALLS	20
 
 void init_syscalls(void);
 extern size_t syscall_entry_call(void* entry_point, void* param1, void* param2, void* param3);

kernel/src/sys/cpu_isr.c

@@ -43,6 +43,11 @@ _Noreturn void sod_screen_legacy(registers_t regs, char* title, char* msg, uint3
 
     qemu_err("PROCESS CAUSED THE EXCEPTION: nr. %d", get_current_proc()->pid);
 
+	if(get_current_proc()->pid != 0) {
+		qemu_note("EXIT HERE");
+		blyat_fire();
+	}
+
     __asm__ volatile("cli");  // Disable interrupts
     __asm__ volatile("hlt");  // Halt
 
@@ -212,7 +217,7 @@ void page_fault(registers_t regs){
     }
     qemu_log("at address (virtual) %x",fault_addr);
 
-    tty_printf("Page fault: ");
+    tty_printf("Process nr.%d caused page fault: ", get_current_proc()->pid); 
     if (present){
         tty_printf("NOT PRESENT, ");
     }

kernel/src/sys/file_descriptors.c

@@ -18,8 +18,8 @@ void file_descriptors_init() {
     qemu_log("File descriptors initialized");
 }
 
-void file_descriptor_allocate(const char *filename, const char *mode, int *out) {
-    FILE* file = fopen(filename, mode);
+void file_descriptor_allocate(const char *filename, size_t mode, int *out) {
+    FILE* file = fopen_binmode(filename, mode);
 
     if(!file) {
         *out = -1;
@@ -70,6 +70,25 @@ void file_descriptor_read(int descriptor_number, size_t count, void* buffer) {
     fread(inf->file, count, 1, buffer);
 }
 
+void file_descriptor_write(int descriptor_number, size_t count, const void* buffer) {
+	qemu_log("FD: %d; Size: %d; Buffer: %x", descriptor_number, count, buffer);
+
+    if(descriptor_number < 0 || descriptor_number >= last_descriptor_number) {
+		qemu_err("Invalid descriptor: %d!", descriptor_number);
+        return;
+    }
+
+	if(!file_descriptor_get(descriptor_number)) {
+        return;
+    }
+
+    struct fd_info* inf = file_descriptor_get(descriptor_number);
+
+	qemu_note("Read: %d bytes (buffer at: %x)", count, buffer);
+
+    fwrite(inf->file, count, 1, buffer);
+}
+
 void file_descriptor_close(int descriptor_number) {
     if(descriptor_number < 0 || descriptor_number >= last_descriptor_number)
         return;

kernel/src/sys/syscalls.c

@@ -159,6 +159,7 @@ void init_syscalls(void){
     calls_table[16] = (syscall_fn_t *)syscall_datetime;
     calls_table[17] = (syscall_fn_t *)syscall_exit;
 	calls_table[18] = (syscall_fn_t *)syscall_memory_realloc;
+	calls_table[19] = (syscall_fn_t *)file_descriptor_write;
 
 	qemu_ok("System calls initialized!");
 }