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Message-ID: <20251114012134.GN1827@brightrain.aerifal.cx>
Date: Thu, 13 Nov 2025 20:21:34 -0500
From: Rich Felker <dalias@...c.org>
To: Demi Marie Obenour <demiobenour@...il.com>
Cc: musl@...ts.openwall.com
Subject: Re: fputs() et al do not return EBADF for read-only files
On Thu, Nov 13, 2025 at 05:21:56PM -0500, Demi Marie Obenour wrote:
> See https://github.com/systemd/systemd/pull/39721 which works around this.
This is expected. Per ISO C, calling an output function on a stream
not opened for output has undefined behavior. Performing an additional
mode check in each putc operation would be relatively costly and
unjustified. This is not an exceptional condition that can happen at
runtime like out-of-memory, insufficient permission, missing file,
etc. Attempting to perform output on an input stream or vice versa is
purely a programming error and the buggy code should be fixed.
Rich
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