Add a scheduler which just keeps of processes for now, and a

with_process to interact with them. User space now has it's own address
space and mapper which means we will be able to allocate memory for it.
I added a bunch of functions as stubs into libxunil which are required
for doomgeneric.

user/libxunil/include/inttypes.h

@@ -1,2 +0,0 @@
-#include <stddef.h>
-#include <stdint.h>

user/libxunil/include/stdio.h

@@ -1,32 +0,0 @@
-#pragma once
-#include <stddef.h>
-#include <stdarg.h>
-
-typedef struct FILE FILE;
-
-extern FILE *stdin;
-extern FILE *stdout;
-extern FILE *stderr;
-
-#define EOF (-1)
-
-FILE  *fopen(const char *path, const char *mode);
-int    fclose(FILE *fp);
-size_t fread(void *ptr, size_t size, size_t nmemb, FILE *fp);
-size_t fwrite(const void *ptr, size_t size, size_t nmemb, FILE *fp);
-int    fseek(FILE *fp, long offset, int whence);
-long   ftell(FILE *fp);
-int    fflush(FILE *fp);
-char  *fgets(char *s, int size, FILE *fp);
-int    fputs(const char *s, FILE *fp);
-int    feof(FILE *fp);
-int    ferror(FILE *fp);
-
-int    printf(const char *fmt, ...);
-int    fprintf(FILE *fp, const char *fmt, ...);
-int    sprintf(char *buf, const char *fmt, ...);
-int    snprintf(char *buf, size_t size, const char *fmt, ...);
-int    vsnprintf(char *buf, size_t size, const char *fmt, va_list ap);
-int    vfprintf(FILE *fp, const char *fmt, va_list ap);
-void write(int fd, const char* buf, unsigned long count);
-void exit(int code);

user/libxunil/include/stdlib.h

@@ -1,20 +0,0 @@
-#pragma once
-#include <stddef.h>
-
-void  *malloc(size_t size);
-void  *calloc(size_t nmemb, size_t size);
-void  *realloc(void *ptr, size_t size);
-void   free(void *ptr);
-
-void   exit(int status);
-void   abort(void);
-
-int    atoi(const char *s);
-long   atol(const char *s);
-double atof(const char *s);
-long   strtol(const char *s, char **endptr, int base);
-double strtod(const char *s, char **endptr);
-
-char  *getenv(const char *name);
-void   qsort(void *base, size_t nmemb, size_t size, int (*cmp)(const void *, const void *));
-int    abs(int x);

user/libxunil/include/string.h

@@ -1,22 +0,0 @@
-#pragma once
-#include <stddef.h>
-
-void *memset(void *s, int c, size_t n);
-void *memcpy(void *dst, const void *src, size_t n);
-void *memmove(void *dst, const void *src, size_t n);
-int   memcmp(const void *s1, const void *s2, size_t n);
-void *memchr(const void *s, int c, size_t n);
-
-size_t strlen(const char *s);
-char  *strcpy(char *dst, const char *src);
-char  *strncpy(char *dst, const char *src, size_t n);
-char  *strcat(char *dst, const char *src);
-char  *strncat(char *dst, const char *src, size_t n);
-int    strcmp(const char *s1, const char *s2);
-int    strncmp(const char *s1, const char *s2, size_t n);
-char  *strchr(const char *s, int c);
-char  *strrchr(const char *s, int c);
-char  *strstr(const char *haystack, const char *needle);
-char  *strtok(char *str, const char *delim);
-char  *strdup(const char *s);
-char  *strerror(int errnum);

user/libxunil/include/strings.h

@@ -1,8 +0,0 @@
-#pragma once
-#include <stddef.h>
-
-int    strcasecmp(const char *s1, const char *s2);
-int    strncasecmp(const char *s1, const char *s2, size_t n);
-void   bzero(void *s, size_t n);
-void   bcopy(const void *src, void *dest, size_t n);
-int    bcmp(const void *s1, const void *s2, size_t n);