stty: verify tcsetattr applied all settings

POSIX allows tcsetattr() to return success while only partially
applying the requested settings. This change adds verification by
reading back the terminal settings after tcsetattr() and comparing
them with the requested configuration.

If the settings don't match, stty now exits with an error message:
"<device>: unable to perform all requested operations"

This matches GNU stty behavior, which uses tcgetattr() after setting
and compares with eq_mode() to detect partial application.

Changes:
- Added verify_termios_changes() function to compare termios structs
- Uses from_bits_truncate() to normalize flags for portable comparison
- Only verifies fields that were actually changed (requested != original)
- Added integration test for multiple settings verification

Fixes #10324

Author: littleKitchen

.vscode/cspell.dictionaries/jargon.wordlist.txt

@@ -1,8 +1,43 @@
+
+
+
+
+
+
+# * CPU/hardware features
+# * abbreviations
+# * clippy
+# * constants
+# * variables
 AFAICT
-asimd
+AMPM
+ASIMD
 ASIMD
+CHLD
+EINTR
+ENOTSUP
+ERANGE
+Hijri
+Nowruz
+PCLMUL
+PCLMULQDQ
+PMULL
+ROOTFS
+SETFL
+SETFL
+SIGCHLD
+SIGTTIN
+SIGTTOU
+SIGUSR
+TOCTOU
+TUNABLES
+TUNABLES
+VMULL
 alloc
+ampm
 arity
+asimd
+asimd
 autogenerate
 autogenerated
 autogenerates
@@ -14,43 +49,46 @@ canonicalization
 canonicalize
 canonicalizing
 capget
+charmap
+chld
+codegen
 codepoint
 codepoints
 codeready
-codegen
 colorizable
 colorize
-coprime
+consts
 consts
 conv
+coprime
 cyclomatic
 dedup
 deduplication
+delim
 demangle
 denoland
+deps
 deque
 dequeue
 dev
-EINTR
-eintr
-nextest
-SIGUSR
-nonprinting
-multibyte
+dev
 devs
 discoverability
-duplicative
 dsync
+duplicative
+eintr
 endianness
+enotsup
 enqueue
-ERANGE
+errno
 errored
+esac
+eval
 executable
 executables
 exponentiate
-eval
-esac
 falsey
+fdlimit
 fileio
 filesystem
 filesystems
@@ -74,41 +112,51 @@ hardlink
 hardlinks
 hasher
 hashsums
+hijri
+hwcaps
 hwcaps
-infile
 iflag
 iflags
+inacc
+infile
+inval
 kibi
 kibibytes
 langinfo
-libacl
 lcase
+libacl
 listxattr
 llistxattr
 lossily
 lstat
+maint
 makedev
 mebi
 mebibytes
 mergeable
 microbenchmark
-microbenchmarks
 microbenchmarking
+microbenchmarks
 monomorphized
 multibyte
+multibyte
 multicall
+nextest
 nmerge
 noatime
 nocache
 nocreat
 noctty
 noerror
 noexec
+nofield
 nofollow
 nolinks
 nonblock
+nonminimal
 nonportable
 nonprinting
+nonprinting
 nonrepeating
 nonseekable
 notrunc
@@ -117,129 +165,82 @@ noxfer
 ofile
 oflag
 oflags
+pclmul
+pclmulqdq
 pdeathsig
 peekable
 performant
+pmull
 prctl
 precompiled
 precompute
 preload
 prepend
 prepended
 primality
+proc
+procs
+progname
 pseudoprime
 pseudoprimes
 quantiles
 readonly
-ROOTFS
 reparse
+retval
+rposition
 rposition
 seedable
-semver
 semiprime
 semiprimes
+semver
 setcap
 setfacl
 setfattr
-SETFL
 setlocale
+setpgid
 shortcode
 shortcodes
-setpgid
 sigaction
-CHLD
-chld
-SIGCHLD
 sigchld
 siginfo
-SIGTTIN
 sigttin
-SIGTTOU
 sigttou
 sigusr
 strcasecmp
 subcommand
+subdir
 subexpression
 submodule
-sync
 symlink
 symlinks
+sync
 syscall
 syscalls
 sysconf
+tcsetattr
+tmpfs
 tokenize
 toolchain
 totalram
 truthy
 tunables
-TUNABLES
+tunables
 ucase
-unbuffered
 udeps
+unbuffered
 unescape
+uninlined
 unintuitive
-unprefixed
 unportable
+unprefixed
 unsync
 urand
+val
+vals
+vmull
 whitespace
 wordlist
 wordlists
 xattrs
-xpass
-
-# * abbreviations
-AMPM
-ampm
-consts
-deps
-dev
-fdlimit
-inacc
-maint
-proc
-procs
-TOCTOU
-
-# * constants
 xffff
-
-# * variables
-delim
-errno
-progname
-retval
-subdir
-val
-vals
-inval
-nofield
-
-# * clippy
-uninlined
-nonminimal
-rposition
-
-# * CPU/hardware features
-ASIMD
-asimd
-hwcaps
-PCLMUL
-pclmul
-PCLMULQDQ
-pclmulqdq
-PMULL
-pmull
-TUNABLES
-tunables
-VMULL
-vmull
-ENOTSUP
-enotsup
-SETFL
-tmpfs
-
-Hijri
-Nowruz
-charmap
-hijri
+xpass