obsolete since the very first version of POSIX.1 in 1988, replaced
with <termios.h>.
+* On Linux, the ioctl constants TCGETS, TCSETS, TCSETSF, TCSETSW,
+ TCGETS2, TCSETS2, TCSETSF2, TCSETSW2 are no longer defined in
+ <sys/ioctl.h>. Applications must use the high-level <termios.h>
+ interfaces instead.
+
* The support for TX lock elision of pthread mutexes is deprecated on
all architectures and will be removed in the next release.
bits/termios-tcflow.h \
# sysdep_headers
+gen-as-const-headers += termios-kernel-consts.sym
+
tests += \
tst-termios-linux \
# tests
+++ /dev/null
-/* Copyright (C) 1996-2025 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library. If not, see
- <https://www.gnu.org/licenses/>. */
-
-#ifndef _SYS_IOCTL_H
-# error "Never use <bits/ioctls.h> directly; include <sys/ioctl.h> instead."
-#endif
-
-/* Use the definitions from the kernel header files. */
-#include <asm/ioctls.h>
-
-/* Oh well, this is necessary since the kernel data structure is
- different from the user-level version. */
-#undef TCGETS
-#undef TCSETS
-#undef TCSETSW
-#undef TCSETSF
-#define TCGETS _IOR ('t', 19, char[44])
-#define TCSETS _IOW ('t', 20, char[44])
-#define TCSETSW _IOW ('t', 21, char[44])
-#define TCSETSF _IOW ('t', 22, char[44])
-
-#include <linux/sockios.h>
+++ /dev/null
-/* Architectural parameters for Linux termios - Alpha/PowerPC version
-
- Copyright (C) 1997-2025 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <https://www.gnu.org/licenses/>. */
-
-#ifndef TERMIOS_INTERNALS_H
-# error "<termios_arch.h> should only be included from <termios_internals.h>"
-#endif
-
-#define _TERMIOS2_NCCS 19
-#define _HAVE_TERMIOS2_C_CC_BEFORE_C_LINE 1
-#define _HAVE_STRUCT_OLD_TERMIOS 0
/* Use the definitions from the kernel header files. */
#include <asm/ioctls.h>
+/* The GNU C library has a different definition of struct termios,
+ incompatible with what the ioctl interface expects. The existence
+ of the termios2 ioctls is considered an implementation detail.
+ Undefine all related ioctl constants. */
+#undef TCGETS
+#undef TCSETS
+#undef TCSETSF
+#undef TCSETSW
+#undef TCGETS2
+#undef TCSETS2
+#undef TCSETSF2
+#undef TCSETSW2
+
+
#include <linux/sockios.h>
+++ /dev/null
-/* Copyright (C) 1996-2025 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library. If not, see
- <https://www.gnu.org/licenses/>. */
-
-#ifndef _SYS_IOCTL_H
-# error "Never use <bits/ioctls.h> directly; include <sys/ioctl.h> instead."
-#endif
-
-/* Use the definitions from the kernel header files. */
-#include <asm/ioctls.h>
-
-/* Oh well, this is necessary since the kernel data structure is
- different from the user-level version. */
-#undef TCGETS
-#undef TCSETS
-#undef TCSETSW
-#undef TCSETSF
-#define TCGETS _IOR ('T', 16, char[36])
-#define TCSETS _IOW ('T', 17, char[36])
-#define TCSETSW _IOW ('T', 18, char[36])
-#define TCSETSF _IOW ('T', 19, char[36])
-
-#include <linux/sockios.h>
__isatty (int fd)
{
struct termios2 k_termios;
- return INLINE_SYSCALL_CALL (ioctl, fd, TCGETS2, &k_termios) == 0;
+ return INLINE_SYSCALL_CALL (ioctl, fd, ARCH_TCGETS, &k_termios) == 0;
}
weak_alias (__isatty, isatty)
__isatty_nostatus (int fd)
{
struct termios2 k_termios;
- return INTERNAL_SYSCALL_CALL (ioctl, fd, TCGETS2, &k_termios) == 0;
+ return INTERNAL_SYSCALL_CALL (ioctl, fd, ARCH_TCGETS, &k_termios) == 0;
}
-/* Architectural parameters for Linux termios - MIPS version
+/* old_termios.h for MIPS.
- Copyright (C) 1991-2025 Free Software Foundation, Inc.
+ Copyright (C) 2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
-#define _TERMIOS2_NCCS 23
-#define _HAVE_TERMIOS2_C_CC_BEFORE_C_LINE 0
-
#define _HAVE_STRUCT_OLD_TERMIOS 1
#define OLD_NCCS 32
-struct old_termios
+typedef struct old_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[OLD_NCCS]; /* control characters */
-};
+ 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[OLD_NCCS]; /* control characters */
+} old_termios_t;
-/* Linux internal definitions for ioctl.
+/* Linux internal definitions for ioctl. powerpc version.
Copyright (C) 2021-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
<https://www.gnu.org/licenses/>. */
#include <termios.h>
+#include <termios_internals.h>
+#include <assert.h>
+
+/* PowerPC quirk: on PowerPC only, ioctl() emulates the TCGETS/TCSETS*
+ ioctls with tcgetattr/tcsetattr using the glibc struct termios.
+ As struct termios2 is the same as the kernel struct termios on PowerPC,
+ simply consider the kernel ones as the termios2 interface, even
+ though the kernel doesn't call it that. */
+
+#define GLIBC_TCGETS _IOR ('t', 19, struct termios)
+#define GLIBC_TCSETS _IOW ('t', 20, struct termios)
+#define GLIBC_TCSETSW _IOW ('t', 21, struct termios)
+#define GLIBC_TCSETSF _IOW ('t', 22, struct termios)
-/* The user-visible size of struct termios has changed. Catch ioctl calls
- using the new-style struct termios, and translate them to old-style. */
static inline bool
__ioctl_arch (int *r, int fd, unsigned long request, void *arg)
{
+ static_assert (GLIBC_TCGETS != KERNEL_TCGETS2,
+ "emulation not possible due to matching ioctl constants");
switch (request)
{
- case TCGETS:
+ case GLIBC_TCGETS:
*r = __tcgetattr (fd, (struct termios *) arg);
break;
- case TCSETS:
+ case GLIBC_TCSETS:
*r = __tcsetattr (fd, TCSANOW, (struct termios *) arg);
break;
- case TCSETSW:
+ case GLIBC_TCSETSW:
*r = __tcsetattr (fd, TCSADRAIN, (struct termios *) arg);
break;
- case TCSETSF:
+ case GLIBC_TCSETSF:
*r = __tcsetattr (fd, TCSAFLUSH, (struct termios *) arg);
break;
+++ /dev/null
-/* Architectural parameters for Linux termios - PowerPC version
-
- Copyright (C) 1997-2025 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <https://www.gnu.org/licenses/>. */
-
-#define _TERMIOS2_NCCS 19
-#define _HAVE_TERMIOS2_C_CC_BEFORE_C_LINE 1
-#define _HAVE_STRUCT_OLD_TERMIOS 0
-
-/* PowerPC quirk: on PowerPC only, ioctl() emulates the TCGETS/TCSETS*
- ioctls with tcgetattr/tcsetattr using the glibc struct termios.
- As struct termios2 is the same as the kernel struct termios on PowerPC,
- simply consider the kernel ones as the termios2 interface, even
- though the kernel doesn't call it that. */
-
-#define TCGETS2 _IOR ('t', 19, struct termios2)
-#define TCSETS2 _IOW ('t', 20, struct termios2)
-#define TCSETSW2 _IOW ('t', 21, struct termios2)
-#define TCSETSF2 _IOW ('t', 22, struct termios2)
+++ /dev/null
-/* Copyright (C) 1996-2025 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <https://www.gnu.org/licenses/>. */
-
-#ifndef _SYS_IOCTL_H
-# error "Never use <bits/ioctls.h> directly; include <sys/ioctl.h> instead."
-#endif
-
-/* Use the definitions from the kernel header files. */
-#include <asm/ioctls.h>
-
-/* Oh well, this is necessary since the kernel data structure is
- different from the user-level version. */
-#undef TCGETS
-#undef TCSETS
-#undef TCSETSW
-#undef TCSETSF
-#define TCGETS _IOR ('T', 8, char[36])
-#define TCSETS _IOW ('T', 9, char[36])
-#define TCSETSW _IOW ('T', 10, char[36])
-#define TCSETSF _IOW ('T', 11, char[36])
-
-#include <linux/sockios.h>
-/* Architectural parameters for Linux termios - SPARC version
+/* old_termios.h for SPARC.
- Copyright (C) 1991-2025 Free Software Foundation, Inc.
+ Copyright (C) 2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
-#define _TERMIOS2_NCCS 19
-#define _HAVE_TERMIOS2_C_CC_BEFORE_C_LINE 0
-
#define _HAVE_STRUCT_OLD_TERMIOS 1
#define OLD_NCCS 17
-struct old_termios
+typedef struct old_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[OLD_NCCS]; /* control characters */
-};
+ 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[OLD_NCCS]; /* control characters */
+} old_termios_t;
__tcgetattr (int fd, struct termios *termios_p)
{
struct termios2 k_termios;
- long int retval = INLINE_SYSCALL_CALL (ioctl, fd, TCGETS2, &k_termios);
+ long int retval = INLINE_SYSCALL_CALL (ioctl, fd, ARCH_TCGETS, &k_termios);
if (__glibc_likely (retval != -1))
{
#define static_assert_equal(x,y) _Static_assert ((x) == (y), #x " != " #y)
+static_assert_equal (sizeof (struct termios2), KERNEL_TERMIOS2_SIZE);
+static_assert_equal (offsetof (struct termios2, c_cc),
+ KERNEL_TERMIOS2_CC_OFFSET);
+static_assert_equal (offsetof (struct termios2, c_line),
+ KERNEL_TERMIOS2_LINE_OFFSET);
+
/* Set the state of FD to *TERMIOS_P. */
int
__tcsetattr (int fd, int optional_actions, const struct termios *termios_p)
*/
static_assert_equal(TCSADRAIN, TCSANOW + 1);
static_assert_equal(TCSAFLUSH, TCSANOW + 2);
- static_assert_equal(TCSETSW2, TCSETS2 + 1);
- static_assert_equal(TCSETSF2, TCSETS2 + 2);
- static_assert_equal(TCSETSW, TCSETS + 1);
- static_assert_equal(TCSETSF, TCSETS + 2);
+ static_assert_equal(KERNEL_TCSETSW2, KERNEL_TCSETS2 + 1);
+ static_assert_equal(KERNEL_TCSETSF2, KERNEL_TCSETS2 + 2);
+ static_assert_equal(KERNEL_TCSETSW, KERNEL_TCSETS + 1);
+ static_assert_equal(KERNEL_TCSETSF, KERNEL_TCSETS + 2);
cmd = (long)optional_actions - TCSANOW;
if (cmd > 2)
k_termios.c_ospeed != k_termios.c_ispeed ||
cbaud (k_termios.c_cflag) == __BOTHER)
{
- cmd += TCSETS2;
+ cmd += KERNEL_TCSETS2;
}
else
{
- cmd += TCSETS;
+ cmd += KERNEL_TCSETS;
k_termios.c_cflag &= ~CIBAUD;
}
--- /dev/null
+#include <linux/termios.h>
+#include <stddef.h>
+
+#ifdef TCGETS2
+# define STRUCT_TERMIOS struct termios2
+#else
+# define TCGETS2 TCGETS
+# define TCSETS2 TCSETS
+# define TCSETSW2 TCSETSW
+# define TCSETSF2 TCSETSF
+# define STRUCT_TERMIOS struct termios
+#endif
+
+--
+KERNEL_TCGETS TCGETS
+KERNEL_TCSETS TCSETS
+KERNEL_TCSETSF TCSETSF
+KERNEL_TCSETSW TCSETSW
+KERNEL_TCGETS2 TCGETS2
+KERNEL_TCSETS2 TCSETS2
+KERNEL_TCSETSF2 TCSETSF2
+KERNEL_TCSETSW2 TCSETSW2
+KERNEL_TERMIOS2_SIZE sizeof (STRUCT_TERMIOS)
+KERNEL_TERMIOS2_CC_OFFSET offsetof (STRUCT_TERMIOS, c_cc)
+KERNEL_TERMIOS2_LINE_OFFSET offsetof (STRUCT_TERMIOS, c_line)
+_TERMIOS2_NCCS sizeof ((STRUCT_TERMIOS) { 0 }.c_cc) / sizeof (cc_t)
+++ /dev/null
-/* Architectural parameters for Linux termios - generic version
-
- Copyright (C) 1997-2025 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <https://www.gnu.org/licenses/>. */
-
-#define _TERMIOS2_NCCS 19
-#define _HAVE_TERMIOS2_C_CC_BEFORE_C_LINE 0
-
-#define _HAVE_STRUCT_OLD_TERMIOS 0
#include <sysdep.h>
#include <shlib-compat.h>
-#include <termios_arch.h>
+#include <termios-kernel-consts.h>
+
+/* Alpha got termios2 late, but TCGETS has exactly the same structure
+ format and function as TCGETS2. On all other platforms, the termios2
+ interface exists as far back as this version of glibc supports.
+
+ For TCSETS* it is more complicated; this is handled in tcsetattr.c. */
+#ifdef __ASSUME_TERMIOS2
+# define ARCH_TCGETS KERNEL_TCGETS2
+#else
+# define ARCH_TCGETS KERNEL_TCGETS
+#endif
/* ---- Kernel interface definitions ---- */
tcflag_t c_oflag; /* output mode flags */
tcflag_t c_cflag; /* control mode flags */
tcflag_t c_lflag; /* local mode flags */
-#if _HAVE_TERMIOS2_C_CC_BEFORE_C_LINE
+#if KERNEL_TERMIOS2_CC_OFFSET < KERNEL_TERMIOS2_LINE_OFFSET
cc_t c_cc[_TERMIOS2_NCCS]; /* control characters */
cc_t c_line; /* line discipline */
#else
speed_t c_ospeed; /* output speed */
};
-/* Alpha got termios2 late, but TCGETS has exactly the same structure
- format and function as TCGETS2. On all other platforms, the termios2
- interface exists as far back as this version of glibc supports.
-
- For TCSETS* it is more complicated; this is handled in tcsetattr.c.
-
- Some other architectures only have the equivalent of the termios2
- interface, in which case the old ioctl names are the only ones
- presented, but are equivalent to the new ones. */
-#ifndef TCGETS2
-# define TCGETS2 TCGETS
-# define TCSETS2 TCSETS
-# define TCSETSW2 TCSETSW
-# define TCSETSF2 TCSETSF
-#elif !__ASSUME_TERMIOS2
-/* Hack for Alpha */
-# undef TCGETS2
-# define TCGETS2 TCGETS
-#endif
-
/* ---- Application interface definitions ---- */
/*
* This only applies to SPARC and MIPS; for other architectures the
* new and old speed_t interfaces both use the same struct termios.
*/
-#if _HAVE_STRUCT_OLD_TERMIOS
-typedef struct old_termios old_termios_t;
-#else
-# define OLD_NCCS NCCS
-typedef struct termios old_termios_t;
-#endif
+#include <old_termios.h>
/* ---- Internal function definitions ---- */
projects / thirdparty / glibc.git / commitdiff
