| PathNameLimit | System.Posix.Files, System.Posix |
| PathVar | System.Posix.Files, System.Posix |
| PipeBufferLimit | System.Posix.Files, System.Posix |
| PosixVersion | System.Posix.Unistd, System.Posix |
| PrioIOAvailable | System.Posix.Files, System.Posix |
| ProcessGroupID | System.Posix |
| ProcessID | System.Posix |
| ProcessInput | System.Posix.Terminal, System.Posix |
| ProcessOutput | System.Posix.Terminal, System.Posix |
| ProcessStatus | System.Posix.Process, System.Posix |
| ProcessTimes |
| 1 (Type/Class) | System.Posix.Process, System.Posix |
| 2 (Data Constructor) | System.Posix.Process, System.Posix |
| packDL | System.Posix.DynamicLinker.Prim, System.Posix.DynamicLinker |
| packRTLDFlags | System.Posix.DynamicLinker.Prim, System.Posix.DynamicLinker |
| putEnv | System.Posix.Env, System.Posix |
