Antti Haapala added the comment:
While at it, another POSIX semantic that execvp doesn't support is the
behaviour when `PATH` is not set, e.g. on Linux, the search path is set to '.',
followed by confstr(_CS_PATH). It is debatable whether this is desired (having
current directory first in search path doesn't exactly sound right, which is
also acknowledged by Linux man pages:
NOTES
On some other systems, the default path (used when the environment
does not contain the variable PATH) has the current working direc‐
tory listed after /bin and /usr/bin, as an anti-Trojan-horse mea‐
sure. Linux uses here the traditional "current directory first"
default path.
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<http://bugs.python.org/issue19948>
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