ceedbf8185
There are downsides to using fexecve: when fexecve is used (for normal executables), /proc/pid/status shows Name: 3, which means that ps -C foobar doesn't work. pidof works, because it checks /proc/self/cmdline. /proc/self/exe also shows the correct link, but requires privileges to read. /proc/self/comm also shows "3". I think this can be considered a kernel deficiency: when O_CLOEXEC is used, this "3" is completely meaningless. It could be any number. The kernel should use argv[0] instead, which at least has *some* meaning. I think the approach with fexecve/execveat is instersting, so let's provide it as opt-in.
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