Hi! On 6/20/23 00:11, наб wrote:
FreeBSD, OpenBSD, and Linux (/dev/ptmx) do all intialisation in open,
and grantpt() is a no-op (that checks whether the fd is a pty, except on
musl).
The illumos gate and NetBSD do a ioctl (and, indeed, illumos-gate commit
facf4a8d7b59fde89a8662b4f4c73a758e6c402c ("PSARC/2003/246 Filesystem
Driven Device Naming"), which kills pt_chmod, notes that it's been
6464196 bfu should remove pt_chmod, obsoleted by /dev filesystem).
glibc 2.33 completely kills BSD PTY support on Linux
(Debian hasn't configured with them on any architecture since 2007:
https://bugs.debian.org/338404
and even earlier on some arches; they're really all but trivia under
trivia or trivial?
Linux ‒ this may be better served stuffed into HISTORY as an explainer for the SIGCHLD thing, since regardless of the "version", the behaviour is well-defined and consistent). Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@xxxxxxxxxxxxxxxxxx>
Please add Jakub.
--- Heh, yeah. While writing I read this as "or a br ioctl" so I didn't notice.
Heh, you'll soon read "or a mr ioctl". Hounds do be released.
man3/grantpt.3 | 18 ++++++++---------- 1 file changed, 8 insertions(+), 10 deletions(-) diff --git a/man3/grantpt.3 b/man3/grantpt.3 index a19172a3e..e3d4e4aaa 100644 --- a/man3/grantpt.3 +++ b/man3/grantpt.3 @@ -84,17 +84,15 @@ .SH ATTRIBUTES .ad .sp 1 .SH VERSIONS -Many systems implement this function via a set-user-ID helper binary +Historical systems implemented this function via a set-user-ID helper binary called "pt_chown". -On Linux systems with a devpts filesystem (present since Linux 2.2), -the kernel normally sets the correct ownership and permissions -for the pseudoterminal slave when the master is opened -.RB ( posix_openpt (3)), -so that nothing must be done by -.BR grantpt (). -Thus, no such helper binary is required -(and indeed it is configured to be absent during the -glibc build that is typical on many systems). +glibc on Linux before 2.33 could do so as well,
This can be confusing: Linux 2.33, or glibc 2.33? As a solution, I decided to always prefix the version with the software name, even if it felt a bit redundant sometimes.
+in order to support configurations with only BSD pseudoterminals; +this support has been removed. +On modern systems this is either a no-op\[em]with
\[em] clearly breaks/interrupts a clause or phrase. Semantic newlines should apply here --I guess that you probably put the two words together to not add an extra space, but I do like that space (and I know this may be controversial)--. Cheers, Alex
+permissions configured on pty allocation, +as is the case on Linux\[em]or an +.BR ioctl (2). .SH STANDARDS POSIX.1-2008. .SH HISTORY
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