[FS, USER] Debug filesystem, fs syscalls

kernel/include/process.h

@@ -7,6 +7,9 @@ typedef struct process_st process_t;
 #include <cpu.h>
 #include <sync.h>
 #include <mem.h>
+#include <vfs.h>
+
+#define PROC_NUMFP 20
 
 struct procmm_mmap_st;
 typedef struct process_st
@@ -20,6 +23,11 @@ typedef struct process_st
   LIST(struct process_st, children);
   LIST(struct process_st, siblings);
   LIST(thread_t, threads);
+  struct {
+    file_t *file;
+    uint64_t flags;
+    uint64_t pos;
+  } fp[PROC_NUMFP];
 } process_t;
 
 #define PROC_STATE_READY 1

kernel/include/syscall.h

@@ -40,8 +40,15 @@ typedef long (*syscall_handler_t)(long num, long, long, long, long, long, long);
 
 #define SYSCALL_REGISTER(name, num) syscall_handlers[num] = syscall_##name
 
+SYSCALL_DECL(open);
+SYSCALL_DECL(close);
+SYSCALL_DECL(read);
 SYSCALL_DECL(write);
+SYSCALL_DECL(isatty);
+SYSCALL_DECL(seek);
+
 SYSCALL_DECL(brk);
+
 SYSCALL_DECL(fork);
 SYSCALL_DECL(exit);
 SYSCALL_DECL(wait);

kernel/include/vfs.h

@@ -22,6 +22,7 @@ typedef struct dirent_st
 #define FS_FILE 0x1
 #define FS_DIR  0x2
 #define FS_PIPE 0x3
+#define FS_TTY  0x4
 
 typedef struct fs_driver_st
 {
@@ -56,3 +57,5 @@ void fs_mount(file_t *root, const char *path);
 void fs_umount(const char *path);
 
 file_t *fs_namef(const char *path);
+
+file_t debug_file;