Added getpagesize(2) with the new return type size_t.

This function is non-standard  and size_t is better than int here.

libmaxsi/c/hsrc/unistd.h

@@ -176,6 +176,7 @@ int unlink(const char*);
 ssize_t write(int, const void*, size_t);
 
 #ifdef SORTIX_EXTENSIONS
+size_t getpagesize(void);
 int memstat(size_t* memused, size_t* memtotal);
 int uptime(uintmax_t* usecssinceboot);
 int writeall(int fd, const void* buffer, size_t len);

libmaxsi/memory.cpp

@@ -36,6 +36,7 @@ namespace Maxsi
 #ifndef SORTIX_KERNEL
 		DEFN_SYSCALL2(int, SysMemStat, SYSCALL_MEMSTAT, size_t*, size_t*);
 		DEFN_SYSCALL1(void*, SysSbrk, SYSCALL_SBRK, intptr_t);
+		DEFN_SYSCALL0(size_t, SysGetPageSize, SYSCALL_GET_PAGE_SIZE);
 
 		extern "C" int memstat(size_t* memused, size_t* memtotal)
 		{
@@ -46,6 +47,11 @@ namespace Maxsi
 		{
 			return SysSbrk(increment);
 		}
+
+		extern "C" size_t getpagesize(void)
+		{
+			return SysGetPageSize();
+		}
 #endif
 
 		DUAL_FUNCTION(void*, memcpy, Copy, (void* Dest, const void* Src, size_t Length))

sortix/process.cpp

@@ -732,6 +732,12 @@ namespace Sortix
 		return (void*) newend;
 	}
 
+	size_t SysGetPageSize()
+	{
+		// TODO: Query the virtual memory layer or look up in the process class.
+		return 0x1000UL;
+	}
+
 	void Process::Init()
 	{
 		Syscall::Register(SYSCALL_EXEC, (void*) SysExecVE);
@@ -742,6 +748,7 @@ namespace Sortix
 		Syscall::Register(SYSCALL_WAIT, (void*) SysWait);
 		Syscall::Register(SYSCALL_REGISTER_ERRNO, (void*) SysRegisterErrno);
 		Syscall::Register(SYSCALL_SBRK, (void*) SysSbrk);
+		Syscall::Register(SYSCALL_GET_PAGE_SIZE, (void*) SysGetPageSize);
 
 		nextpidtoallocate = 0;
 

sortix/syscallnum.h

@@ -62,7 +62,8 @@
 #define SYSCALL_UPTIME 34
 #define SYSCALL_SBRK 35
 #define SYSCALL_SEEK 36
-#define SYSCALL_MAX_NUM 37 /* index of highest constant + 1 */
+#define SYSCALL_GET_PAGE_SIZE 37
+#define SYSCALL_MAX_NUM 38 /* index of highest constant + 1 */
 
 #endif