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The manpage has contained the following verbiage on the matter for just under 31 years: "At least one argument must be present in the array" Previous to this version, it had been prefaced with the weakening phrase "By convention." Carry through and document it the rest of the way. Allowing argc == 0 has been a source of security issues in the past, and it's hard to imagine a valid use-case for allowing it. Toss back EINVAL if we ended up not copying in any args for *execve(). The manpage change can be considered "Obtained from: OpenBSD" Reviewed by: emaste, kib, markj (all previous version) Differential Revision: https://reviews.freebsd.org/D34045
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