Fix procfs on /proc/self with user namespaces #859
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Use `readlink` on the /proc/self symlink instead of `getpid`, so that we get the pid relative to the procfs's pid namespace rather than the process' pid namespace. Fixes #854.
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Use
readlinkon the /proc/self symlink instead ofgetpid, so that we get the pid relative to the procfs's pid namespace rather than the process' pid namespace.Fixes #854.