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isatty.3: Most non-tty files nowadays result in the error ENOTTY 

Historically, at least FIFOs and pipes yielded the error EINVAL.

Reported-by: Jakub Wilk <jwilk@jwilk.net>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2019-02-25 15:39:59 +01:00
parent ff5fa0ace3
commit 44e9941b97
1 changed files with 7 additions and 5 deletions
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12
man3/isatty.3
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@ -52,13 +52,15 @@ is set to indicate the error.
.I fd
is not a valid file descriptor.
.TP
.B EINVAL
.B ENOTTY
.I fd
refers to a file other than a terminal.
POSIX.1 specifies the error
.BR ENOTTY
.\" FIXME . File a bug for this?
for this case.
On some older kernels, some types of files
.\" e.g., FIFOs and pipes on 2.6.32)
resulted in the error
.B EINVAL
in this case (which is a violation of POSIX, which specifies the error
.BR ENOTTY ).
.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).