The functions and macros listed in this chapter give information about configuration parameters of the operating system---for example, capacity limits, presence of optional POSIX features, and the default path for executable files (see String Parameters).
| General Limits | Constants and functions that describe various process-related limits that have one uniform value for any given machine. |
| System Options | Optional POSIX features. |
| Version Supported | Version numbers of POSIX.1 and POSIX.2. |
| Sysconf | Getting specific configuration values of general limits and system options. |
| Minimums | Minimum values for general limits. |
| Limits for Files | Size limitations that pertain to individual files. These can vary between file systems or even from file to file. |
| Options for Files | Optional features that some files may support. |
| File Minimums | Minimum values for file limits. |
| Pathconf | Getting the limit values for a particular file. |
| Utility Limits | Capacity limits of some POSIX.2 utility programs. |
| Utility Minimums | Minimum allowable values of those limits. |
| String Parameters | Getting the default search path. |