Lennart Poettering
f8606626ed
let's return ENOSYS in that case, to make things a bit less confusng. Previously we'd just propagate ENOENT, which people might mistake as applying to the object being modified rather than /proc/ just not being there. Let's return ENOSYS instead, i.e. an error clearly indicating that some kernel API is not available. This hopefully should put people on a better track. Note that we only do the procfs check in the error path, which hopefully means it's the less likely path. We probably can add similar bits to more suitable codepaths dealing with /proc/self/fd, but for now, let's pick to the ones noticed in #14745. Fixes: #14745
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