mirror of
https://sourceware.org/git/glibc.git
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0f93d54cde
This reverts commit 3d3572f590.
Reason for revert: TCGETS etc. work to some extent on at least
a subset of architectures, so there is no pressing need to force
applications off them. Removal of the macros breaks building
the sanitizers, impacting both GCC and LLVM.
Reviewed-by: Sam James <sam@gentoo.org>
144 lines
4.2 KiB
C
144 lines
4.2 KiB
C
/* termios functions internal implementation header for Linux
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Copyright (C) 1991-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef TERMIOS_INTERNALS_H
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#define TERMIOS_INTERNALS_H 1
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#include <stddef.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include <termios.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sysdep.h>
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#include <shlib-compat.h>
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#include <termios_arch.h>
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/* ---- Kernel interface definitions ---- */
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/* The the termios2 structure used in the kernel interfaces is not the
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same as the termios structure we use in the libc. Therefore we
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must translate it here. */
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struct termios2
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{
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tcflag_t c_iflag; /* input mode flags */
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tcflag_t c_oflag; /* output mode flags */
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tcflag_t c_cflag; /* control mode flags */
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tcflag_t c_lflag; /* local mode flags */
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#if _HAVE_TERMIOS2_C_CC_BEFORE_C_LINE
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cc_t c_cc[_TERMIOS2_NCCS]; /* control characters */
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cc_t c_line; /* line discipline */
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#else
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cc_t c_line; /* line discipline */
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cc_t c_cc[_TERMIOS2_NCCS]; /* control characters */
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#endif
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speed_t c_ispeed; /* input speed */
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speed_t c_ospeed; /* output speed */
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};
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/* Alpha got termios2 late, but TCGETS has exactly the same structure
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format and function as TCGETS2. On all other platforms, the termios2
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interface exists as far back as this version of glibc supports.
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For TCSETS* it is more complicated; this is handled in tcsetattr.c.
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Some other architectures only have the equivalent of the termios2
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interface, in which case the old ioctl names are the only ones
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presented, but are equivalent to the new ones. */
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#ifndef TCGETS2
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# define TCGETS2 TCGETS
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# define TCSETS2 TCSETS
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# define TCSETSW2 TCSETSW
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# define TCSETSF2 TCSETSF
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#elif !__ASSUME_TERMIOS2
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/* Hack for Alpha */
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# undef TCGETS2
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# define TCGETS2 TCGETS
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#endif
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/* ---- Application interface definitions ---- */
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/*
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* Should old speed_t and struct termios (if applicable) compatibility
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* functions be included?
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*/
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#define _TERMIOS_OLD_COMPAT SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_42)
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/*
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* Old struct termios (without c_ispeed and c_ospeed fields) if
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* applicable. The new struct termios *must* be binary identical up to
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* the sizeof the old structure.
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*
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* This only applies to SPARC and MIPS; for other architectures the
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* new and old speed_t interfaces both use the same struct termios.
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*/
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#if _HAVE_STRUCT_OLD_TERMIOS
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typedef struct old_termios old_termios_t;
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#else
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# define OLD_NCCS NCCS
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typedef struct termios old_termios_t;
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#endif
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/* ---- Internal function definitions ---- */
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/*
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* Copy a set of c_cc fields of possibly different width. If the target
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* field is longer, then fill with _POSIX_VDISABLE == -1.
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*/
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static inline void
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copy_c_cc (cc_t *to, size_t nto, const cc_t *from, size_t nfrom)
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{
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if (nto < nfrom)
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nfrom = nto;
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to = __mempcpy (to, from, nfrom * sizeof(cc_t));
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if (nto > nfrom)
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memset (to, _POSIX_VDISABLE, (nto - nfrom) * sizeof(cc_t));
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}
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/* Extract the output and input legacy speed fields from c_cflag. */
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static inline tcflag_t
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cbaud (tcflag_t c_cflag)
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{
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return c_cflag & CBAUD;
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}
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static inline tcflag_t
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cibaud (tcflag_t c_cflag)
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{
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return cbaud (c_cflag >> IBSHIFT);
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}
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extern speed_t
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___cbaud_to_speed (tcflag_t c_cflag, speed_t other)
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__attribute_const__ attribute_hidden;
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extern tcflag_t
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___speed_to_cbaud (speed_t speed)
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__attribute_const__ attribute_hidden;
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extern void
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___termios2_canonicalize_speeds (struct termios2 *k_termios_p)
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attribute_hidden;
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#endif /* TERMIOS_INTERNALS_H */
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