On 23 Apr 1998 04:56:12 -0700, Guy Maor <[EMAIL PROTECTED]> said:
> Roderick Schertler <[EMAIL PROTECTED]> writes:
>>
>> getlogin() is supposed to work even if isatty(0) is false. It is bug
>> #17528.
>
> How can it? If isatty() is false, then ttyname(3) is null, so
> getlogin() can't look up the entry in utmp.
It's supposed to open /dev/tty instead of using stdin. This is the way
it works on all the systems I could get people to check for me, which
are Linux with libc5, AIX 4.2, Solaris 2.4, Solaris 2.5, DG/UX 4.11 and
FreeBSD 2.2.2-R.
Here's an example (from dgux):
# who | grep 'pts/[45] '
roderick pts/4 Apr 23 02:01
ccost pts/5 Apr 23 09:11
# tty
/dev/pts/4
# cat getlogin
#!/usr/bin/perl -lw
$l = getlogin;
print defined($l) ? $l : 'undef';
# ./getlogin
roderick
# ./getlogin < /dev/pts/5
roderick
# ./getlogin < /dev/null
roderick
# setsid ./getlogin
undef
#
--
Roderick Schertler
[EMAIL PROTECTED]
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