* Grab an existing process. * Return an opaque pointer to its process control structure. * * pid: UNIX process ID. * flags: * PGRAB_RETAIN Retain tracing flags (default clears all tracing flags). * PGRAB_FORCE Grab regardless of whether process is already traced. * PGRAB_RDONLY Open the address space file O_RDONLY instead of O_RDWR, * and do not open the process contr
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