| Catch | System.Posix.Signals, System.Posix.Signals.Exts, System.Posix |
| CatchOnce | System.Posix.Signals, System.Posix.Signals.Exts, System.Posix |
| CCc | System.Posix |
| CDev | System.Posix |
| CGid | System.Posix |
| changeWorkingDirectory | System.Posix.Directory, System.Posix |
| changeWorkingDirectoryFd | System.Posix.Directory, System.Posix |
| characterSpecialMode | System.Posix.Files, System.Posix |
| CheckParity | System.Posix.Terminal, System.Posix |
| ChildLimit | System.Posix.Unistd, System.Posix |
| childSystemTime | System.Posix.Process, System.Posix |
| childUserTime | System.Posix.Process, System.Posix |
| CIno | System.Posix |
| ClockTick |
| 1 (Type/Class) | System.Posix |
| 2 (Data Constructor) | System.Posix.Unistd, System.Posix |
| closeDirStream | System.Posix.Directory, System.Posix |
| closeFd | System.Posix.IO, System.Posix |
| CloseOnExec | System.Posix.IO, System.Posix |
| CMode | System.Posix |
| CNlink | System.Posix |
| COff | System.Posix |
| continueProcess | System.Posix.Signals, System.Posix.Signals.Exts, System.Posix |
| controlChar | System.Posix.Terminal, System.Posix |
| ControlCharacter | System.Posix.Terminal, System.Posix |
| controlFlow | System.Posix.Terminal, System.Posix |
| CPid | System.Posix |
| cpuTimeLimitExceeded | System.Posix.Signals, System.Posix.Signals.Exts, System.Posix |
| createDevice | System.Posix.Files, System.Posix |
| createDirectory | System.Posix.Directory, System.Posix |
| createFile | System.Posix.IO, System.Posix |
| createLink | System.Posix.Files, System.Posix |
| createNamedPipe | System.Posix.Files, System.Posix |
| createPipe | System.Posix.IO, System.Posix |
| createProcessGroup | System.Posix.Process, System.Posix |
| createSession | System.Posix.Process, System.Posix |
| createSymbolicLink | System.Posix.Files, System.Posix |
| CRLim | System.Posix |
| CSpeed | System.Posix |
| CSsize | System.Posix |
| CTcflag | System.Posix |
| CUid | System.Posix |
| c_dlclose | System.Posix.DynamicLinker.Prim, System.Posix.DynamicLinker |
| c_dlerror | System.Posix.DynamicLinker.Prim, System.Posix.DynamicLinker |
| c_dlopen | System.Posix.DynamicLinker.Prim, System.Posix.DynamicLinker |
| c_dlsym | System.Posix.DynamicLinker.Prim, System.Posix.DynamicLinker |
| c_execvpe | System.Posix.Process.Internals |
