[DragonFlyBSD - Bug #3252] (New) tcsetattr/tcgetattr set errno incorrectly on non-TTY

[bugtracker-admin at leaf.dragonflybsd.org]

Issue #3252 has been reported by tonyc.

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Bug #3252: tcsetattr/tcgetattr set errno incorrectly on non-TTY
http://bugs.dragonflybsd.org/issues/3252

* Author: tonyc
* Status: New
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
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tcsetattr() and tcgetattr() are documented to fail as follows:

     Upon successful completion, the functions tcgetattr() and tcsetattr()
     return a value of 0.  Otherwise, they return -1 and the global variable
     errno is set to indicate the error, as follows:

...

     [ENOTTY]           The file associated with the fd argument to
                        tcgetattr() or tcsetattr() is not a terminal.

which matches POSIX, but they do not set errno correctly:

$ cc -otcerror tcerror.c
$ ./tcerror
OK: tcgetattr on /dev/null failed as expected
FAIL: tcgetattr on /dev/null set errno incorrectly: Operation not supported by device
OK: tcsetattr failed as expected
FAIL: tcsetattr failure set errno incorrectly: Operation not supported by device
$ uname -a
DragonFly  5.8-RELEASE DragonFly v5.8.3-RELEASE #10: Thu Sep 24 19:19:45 EDT 2020     root at www.shiningsilence.com:/usr/obj/home/justin/release/5_8/sys/X86_64_GENERIC  x86_64

This was discovered while diagnosing perl test failures.

---Files--------------------------------
tcerror.c (1.03 KB)


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