Update MentOs code to the latest development version.

libc/inc/bits/ioctls.h

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+/// @file ioctls.h
+/// @brief Input/Output ConTroL (IOCTL) numbers.
+/// @copyright (c) 2014-2021 This file is distributed under the MIT License.
+/// See LICENSE.md for details.
+
+#pragma once
+
+#define TCGETS 0x5401U ///< Get the current serial port settings.
+#define TCSETS 0x5402U ///< Set the current serial port settings.

libc/inc/bits/stat.h

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+///                MentOS, The Mentoring Operating system project
+/// @file stat.h
+/// @brief Defines the structure used by the functiosn fstat(), lstat(), and stat().
+/// @copyright (c) 2014-2021 This file is distributed under the MIT License.
+/// See LICENSE.md for details.
+
+#pragma once
+
+#if !defined(__SYS_STAT_H) && !defined(__KERNEL__)
+#error "Never include <bits/stat.h> directly; use <sys/stat.h> instead."
+#endif
+
+#include "stddef.h"
+#include "time.h"
+
+/// @brief Data structure which contains information about a file.
+typedef struct stat_t {
+    /// ID of device containing file.
+    dev_t st_dev;
+    /// File serial number.
+    ino_t st_ino;
+    /// Mode of file.
+    mode_t st_mode;
+    /// File user id.
+    uid_t st_uid;
+    /// File group id.
+    gid_t st_gid;
+    /// File Size.
+    off_t st_size;
+    /// Time of last access.
+    time_t st_atime;
+    /// Time of last data modification.
+    time_t st_mtime;
+    /// Time of last status change.
+    time_t st_ctime;
+} stat_t;

libc/inc/bits/termios-struct.h

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+///                MentOS, The Mentoring Operating system project
+/// @file termios-struct.h
+/// @brief Definition of the `termios` structure.
+/// @copyright (c) 2014-2021 This file is distributed under the MIT License.
+/// See LICENSE.md for details.
+
+#pragma once
+
+/// Type for control characters.
+typedef unsigned char cc_t;
+/// Type for speed.
+typedef unsigned int speed_t;
+/// Type for flags.
+typedef unsigned int tcflag_t;
+/// The number of control characters.
+#define NCCS 32
+
+/// @brief Stores information about a terminal IOs.
+typedef struct termios {
+    tcflag_t c_iflag; ///< input mode flags
+    tcflag_t c_oflag; ///< output mode flags
+    tcflag_t c_cflag; ///< control mode flags
+    tcflag_t c_lflag; ///< local mode flags
+    cc_t c_line;      ///< line discipline
+    cc_t c_cc[NCCS];  ///< control characters
+    speed_t c_ispeed; ///< input speed
+    speed_t c_ospeed; ///< output speed
+} termios;
+
+/// @brief These flags generally control higher-level aspects of input processing than the input
+/// modes flags described in Input Modes, such as echoing, signals, and the choice of canonical
+/// or noncanonical input.
+enum {
+    ISIG    = 000001U, ///< Controls whether the INTR, QUIT, and SUSP characters are recognized.
+    ICANON  = 000002U, ///< Enables canonical input processing mode.
+    ECHO    = 000010U, ///< Echo input characters.
+    ECHOE   = 000020U, ///< If ICANON is set, the ERASE character erases the preceding character.
+    ECHOK   = 000040U, ///< If ICANON is set, the KILL character erases the current line.
+    ECHONL  = 000100U, ///< If ICANON is set, echo the NL character even if ECHO is not set.
+    NOFLSH  = 000200U, ///< Do not clear in/out queues when receiving INTR, QUIT, and SUSP.
+    TOSTOP  = 000400U, ///< Allows SIGTTOU signals generated by background processes.
+    ECHOCTL = 001000U, ///< If this and ECHO are set, control characters with ‘^’ are echoed.
+    ECHOKE  = 004000U, ///< If ICANON is set, KILL is echoed by erasing each character on the line.
+    IEXTEN  = 100000U, ///< Enables implementation-defined input processing.
+};