libc: Add (de)allocate_memory wrappers located in sys/mman.h

apps/app.c

@@ -1,11 +1,9 @@
-#include <bits/mmap-flags.h>
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <sys/syscall.h>
+#include <sys/mman.h>
 #include <time.h>
-#include <unistd.h>
 
 void bye()
 {
@@ -24,17 +22,11 @@ int main()
 
     console_write("\n", 1);
 
-    long rc = syscall(SYS_allocate_memory, 4096, PROT_READ | PROT_WRITE);
+    char* address = (char*)allocate_memory(PAGE_SIZE * 2, PROT_READ | PROT_WRITE);
-    if (rc < 0)
-    {
-        printf("allocate_memory: %s\n", strerror(-rc));
-        return 1;
-    }
-    char* address = (char*)rc;
     printf("address: %p\n", address);
     printf("memory at address: %c\n", *address);
     *address = 'e';
     printf("memory at address: %c\n", *address);
 
-    syscall(SYS_deallocate_memory, address);
+    deallocate_memory(address, PAGE_SIZE * 2);
 }

libc/CMakeLists.txt

@@ -10,6 +10,7 @@ set(SOURCES
     src/atexit.cpp
     src/ctype.cpp
     src/time.cpp
+    src/sys/mman.cpp
 )
 
 if(${ARCH} STREQUAL "x86_64")

libc/include/sys/mman.h

@@ -0,0 +1,23 @@
+#ifndef _LUNA_MMAN_H
+#define _LUNA_MMAN_H
+
+#include <bits/mmap-flags.h>
+#include <sys/types.h>
+
+#define PAGE_SIZE 4096
+
+#define MAP_FAILED (void*)-1
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+    void* allocate_memory(size_t size, int flags);
+    int deallocate_memory(void* address, size_t size);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

libc/src/sys/mman.cpp

@@ -0,0 +1,19 @@
+#include <bits/errno-return.h>
+#include <sys/mman.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+extern "C"
+{
+    void* allocate_memory(size_t size, int flags)
+    {
+        long rc = syscall(SYS_allocate_memory, size, flags);
+        __errno_return(rc, void*);
+    }
+
+    int deallocate_memory(void* address, size_t size)
+    {
+        long rc = syscall(SYS_deallocate_memory, address, size);
+        __errno_return(rc, int);
+    }
+}