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You still need permission to send a signal, trying with signal zero will tell you if you have those permissions.
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This is not true.
Sending signal 0 to process will indicate only ' whether a process is alive or not and not about the permissions the users has with respect to the process '.
When a normal user sends signal to a process which is running as process owned by ' root ' ALIVE status ( indicating that the process is running ) would be returned.
