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| author | H. Peter Anvin <hpa@zytor.com> | 2025-07-12 22:19:43 -0700 |
|---|---|---|
| committer | Andreas K. Hüttel <dilfridge@gentoo.org> | 2025-07-20 17:17:41 +0200 |
| commit | 12126f86f2526da325cd17a6463ec4c0c3db981e (patch) | |
| tree | c42b8fd56f6b5517eca9510cd50d995b875f8424 | |
| parent | 0332959dd27e8be7e488862211327eab3531e520 (diff) | |
| download | glibc-12126f86f2526da325cd17a6463ec4c0c3db981e.zip glibc-12126f86f2526da325cd17a6463ec4c0c3db981e.tar.gz glibc-12126f86f2526da325cd17a6463ec4c0c3db981e.tar.bz2 | |
termios: SPEED_MAX and BAUD_MAX constants
Add constants indicating the maximum values of speed_t and baud_t.
Hopefully if and when the baud_t interface is standardized then
BAUD_MAX will be included in the standardization from the start.
Historically, the __MAX_BAUD symbol has indicated the maximum speed_t
value on at least some platforms (including glibc). However, this
name would be problematic for future standardization, because it
confusingly implies a reference to baud_t, not speed_t, and it is
inconsistent with other limit symbols, which are all of the form *_MAX
(e.g. SIZE_MAX for size_t.)
[ v3: dropped leading underscores, leave __MAX_BAUD outside
#ifdef __USE_MISC since it is a legacy symbol, and
namespace-protected with a double underscore.
(Collin Funk, Adhermerval Zanella Netto) ]
[ v4: moved from __USE_MISC to __USE_GNU (Collin Funk) ]
Signed-off-by: "H. Peter Anvin" (Intel) <hpa@zytor.com>
Reviewed-by: Collin Funk <collin.funk1@gmail.com>
| -rw-r--r-- | bits/termios-baud.h | 5 | ||||
| -rw-r--r-- | termios/termios.h | 1 |
2 files changed, 5 insertions, 1 deletions
diff --git a/bits/termios-baud.h b/bits/termios-baud.h index bafde1a..697ad80 100644 --- a/bits/termios-baud.h +++ b/bits/termios-baud.h @@ -69,4 +69,7 @@ #define B5000000 5000000U #define B10000000 10000000U -#define __MAX_BAUD 4294967295U +#ifdef __USE_GNU +#define SPEED_MAX 4294967295U /* maximum valid speed_t value */ +#endif +#define __MAX_BAUD 4294967295U /* legacy alias for SPEED_MAX */ diff --git a/termios/termios.h b/termios/termios.h index 3347c88..91cbe87 100644 --- a/termios/termios.h +++ b/termios/termios.h @@ -64,6 +64,7 @@ extern int cfsetspeed (struct termios *__termios_p, speed_t __speed) __THROW; #ifdef __USE_GNU /* Interfaces that are explicitly numeric representations of baud rates */ typedef speed_t baud_t; +#define BAUD_MAX SPEED_MAX /* Return the output baud rate stored in *TERMIOS_P. */ extern baud_t cfgetobaud (const struct termios *__termios_p) __THROW; |