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* [Bug libc/11538] New: invalid use of errno after calling ttyname_r
@ 2010-04-25 20:12 bruno at clisp dot org
2010-04-25 20:15 ` [Bug libc/11538] " bruno at clisp dot org
2010-05-03 17:01 ` drepper at redhat dot com
0 siblings, 2 replies; 4+ messages in thread
From: bruno at clisp dot org @ 2010-04-25 20:12 UTC (permalink / raw)
To: glibc-bugs
ttyname_r is specified in POSIX
<http://www.opengroup.org/onlinepubs/9699919799/functions/ttyname.html>.
The return value is specified like this:
"If successful, the ttyname_r() function shall return zero.
Otherwise, an error number shall be returned to indicate the error."
This means, ttyname_r should return the error number. Whether it
additionally stores it in errno, is not specified. And indeed,
the two implementations in glibc/sysdeps/posix/ttyname_r.c and
glibc/sysdeps/unix/sysv/linux/ttyname_r.c can fail, returning
ENOTTY, without setting errno to ENOTTY. (Look at the end of the
function getttyname_r: If it cannot find the tty, it sets errno to
its previous value ('save') and returns ENOTTY. When all calls to
getttyname_r end like this, __ttyname_r returns ENOTTY without
assigning errno.)
Therefore, callers of ttyname_r should not use the value of errno
after the call failed, but instead use the return value from ttyname_r.
Find attached a fix.
--
Summary: invalid use of errno after calling ttyname_r
Product: glibc
Version: 2.11
Status: NEW
Severity: normal
Priority: P2
Component: libc
AssignedTo: drepper at redhat dot com
ReportedBy: bruno at clisp dot org
CC: glibc-bugs at sources dot redhat dot com
GCC build triplet: i686-pc-linux-gnu
GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu
http://sourceware.org/bugzilla/show_bug.cgi?id=11538
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* [Bug libc/11538] invalid use of errno after calling ttyname_r
2010-04-25 20:12 [Bug libc/11538] New: invalid use of errno after calling ttyname_r bruno at clisp dot org
@ 2010-04-25 20:15 ` bruno at clisp dot org
2010-05-03 17:01 ` drepper at redhat dot com
1 sibling, 0 replies; 4+ messages in thread
From: bruno at clisp dot org @ 2010-04-25 20:15 UTC (permalink / raw)
To: glibc-bugs
------- Additional Comments From bruno at clisp dot org 2010-04-25 20:15 -------
Created an attachment (id=4752)
--> (http://sourceware.org/bugzilla/attachment.cgi?id=4752&action=view)
proposed fix
--
http://sourceware.org/bugzilla/show_bug.cgi?id=11538
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* [Bug libc/11538] invalid use of errno after calling ttyname_r
2010-04-25 20:12 [Bug libc/11538] New: invalid use of errno after calling ttyname_r bruno at clisp dot org
2010-04-25 20:15 ` [Bug libc/11538] " bruno at clisp dot org
@ 2010-05-03 17:01 ` drepper at redhat dot com
1 sibling, 0 replies; 4+ messages in thread
From: drepper at redhat dot com @ 2010-05-03 17:01 UTC (permalink / raw)
To: glibc-bugs
------- Additional Comments From drepper at redhat dot com 2010-05-03 17:00 -------
Already applied.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
http://sourceware.org/bugzilla/show_bug.cgi?id=11538
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* [Bug libc/11538] invalid use of errno after calling ttyname_r
[not found] <bug-11538-131@http.sourceware.org/bugzilla/>
@ 2014-06-30 9:19 ` fweimer at redhat dot com
0 siblings, 0 replies; 4+ messages in thread
From: fweimer at redhat dot com @ 2014-06-30 9:19 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=11538
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Flags| |security-
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end of thread, other threads:[~2014-06-30 9:19 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2010-04-25 20:12 [Bug libc/11538] New: invalid use of errno after calling ttyname_r bruno at clisp dot org
2010-04-25 20:15 ` [Bug libc/11538] " bruno at clisp dot org
2010-05-03 17:01 ` drepper at redhat dot com
[not found] <bug-11538-131@http.sourceware.org/bugzilla/>
2014-06-30 9:19 ` fweimer at redhat dot com
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