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man: document preference for secure_getenv() in coding style

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(cherry picked from commit c9b477415a6293b74df67c8118bafb0ef8662819)
(cherry picked from commit 1f0d68c6e9dc7cc9bd14f47d03eec10389e2c845)
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Lennart Poettering 2024-10-14 11:55:59 +02:00 committed by Luca Boccassi
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docs/CODING_STYLE.md
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@ -557,6 +557,14 @@ SPDX-License-Identifier: LGPL-2.1-or-later
important for objects that unprivileged users may allocate, but also matters
for everything else any user may allocate.
- Please use `secure_getenv()` for all environment variable accesses, unless
it's clear that `getenv()` would be the better choice. This matters in
particular in `src/basic/` and `src/shared/` (i.e. library code that might
end up in unexpected processes), but should be followed everywhere else too
(in order to make it unproblematic to move code around). To say this clearly:
the default should be `secure_getenv()`, the exception should be regular
`getenv()`.
## Types
- Think about the types you use. If a value cannot sensibly be negative, do not