-#define SYS_WRITE 72 // Write to an open file
-#define SYS_IOCTL 73 // Perform an IOCtl Call
-#define SYS_SEEK 74 // Seek to a new position in the file
-#define SYS_READDIR 75 // Read from an open directory
-#define SYS_GETACL 76 // Get an ACL Value
-#define SYS_SETACL 77 // Set an ACL Value
-#define SYS_FINFO 78 // Get file information
-#define SYS_MKDIR 79 // Create a new directory
-#define SYS_LINK 80 // Create a new link to a file
-#define SYS_SYMLINK 81 // Create a symbolic link
-#define SYS_UNLINK 82 // Delete a file
-#define SYS_TELL 83 // Return the current file position
-#define SYS_CHDIR 84 // Change current directory
-#define SYS_GETCWD 85 // Get current directory
-#define SYS_MOUNT 86 // Mount a filesystem
-#define SYS_SELECT 87 // Wait for file handles
+#define SYS_READAT 72 // Read from an open file (with offset)
+#define SYS_WRITE 73 // Write to an open file
+#define SYS_WRITEAT 74 // Write to an open file (with offset)
+#define SYS_TRUNCATE 75 // Change the size of an open file
+#define SYS_IOCTL 76 // Perform an IOCtl Call
+#define SYS_SEEK 77 // Seek to a new position in the file
+#define SYS_READDIR 78 // Read from an open directory
+#define SYS_GETACL 79 // Get an ACL Value
+#define SYS_SETACL 80 // Set an ACL Value
+#define SYS_FINFO 81 // Get file information
+#define SYS_MKDIR 82 // Create a new directory
+#define SYS_LINK 83 // Create a new link to a file
+#define SYS_SYMLINK 84 // Create a symbolic link
+#define SYS_UNLINK 85 // Delete a file
+#define SYS_TELL 86 // Return the current file position
+#define SYS_CHDIR 87 // Change current directory
+#define SYS_GETCWD 88 // Get current directory
+#define SYS_MOUNT 89 // Mount a filesystem
+#define SYS_SELECT 90 // Wait for file handles
+#define SYS_MMAP 91 // Map a file into this address space
+#define SYS_MUNMAP 92 // Unmap a file
+#define SYS_MARSHALFD 93 // Create a reference to a FD suitable for handing to another process
+#define SYS_UNMARSHALFD 94 // Accept a marshaled FD