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5f138519eb
Add an explicitly numeric interface for baudrate setting. For glibc, this only announces what is a fair accompli, but this is a plausible way forward for standardization, and may be possible to infill on non-compliant systems. The POSIX committee has stated: [https://www.austingroupbugs.net/view.php?id=1916#c7135] A future version of this standard is expected to add at least the following symbolic constants for use as values of objects of type speed_t: B57600, B115200, B230400, B460800, and B921600. Implementations are encouraged to propose additional interfaces which will make it possible to set and query a wider range of speeds than just those enumerated by the constants beginning with B. If a set of common interfaces emerges between several implementations, a future version of this standard will likely add those interfaces. This is exactly that interface. The use of the term "baud" is due to the need to have a term contrasting "speed", and it is already well established as a legacy term -- including in the names of the legacy Bxxx constants. Futhermore, it *is* valid from the point of view that the termios interface fundamentally emulates an RS-232 serial port as far as the application software is concerned. The documentation states that for the current version of glibc, speed_t == baud_t, but explicitly declares that this may not be the case in the future. Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
57 lines
1.7 KiB
C
57 lines
1.7 KiB
C
/* `struct termios' speed frobnication functions, baud rate wrappers.
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Any platform which doesn't have Bxxx == xxx for all baud rate
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constants will need to override this file.
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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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#include <stddef.h>
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#include <errno.h>
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#include <termios.h>
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baud_t
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__cfgetobaud (const struct termios *termios_p)
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{
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return __cfgetospeed (termios_p);
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}
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libc_hidden_def (__cfgetobaud)
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weak_alias (__cfgetobaud, cfgetobaud)
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baud_t
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__cfgetibaud (const struct termios *termios_p)
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{
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return __cfgetispeed (termios_p);
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}
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libc_hidden_def (__cfgetibaud)
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weak_alias (__cfgetibaud, cfgetibaud)
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int
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__cfsetobaud (struct termios *termios_p, baud_t baud)
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{
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return __cfsetospeed (termios_p, baud);
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}
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libc_hidden_def (__cfsetobaud)
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weak_alias (__cfsetobaud, cfsetobaud)
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int
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__cfsetibaud (struct termios *termios_p, baud_t baud)
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{
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return __cfsetispeed (termios_p, baud);
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}
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libc_hidden_def (__cfsetibaud)
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weak_alias (__cfsetibaud, cfsetibaud)
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