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| _PC_LINK_MAX |
| | returns the maximum number of links to the file. If filedes or path refer to a directory, then the value applies to the whole directory. The corresponding macro is _POSIX_LINK_MAX. |
| _PC_MAX_CANON |
| | returns the maximum length of a formatted input line, where filedes or path must refer to a terminal. The corresponding macro is _POSIX_MAX_CANON. |
| _PC_MAX_INPUT |
| | returns the maximum length of an input line, where filedes or path must refer to a terminal. The corresponding macro is _POSIX_MAX_INPUT. |
| _PC_NAME_MAX |
| | returns the maximum length of a filename in the directory path or filedes. the process is allowed to create. The corresponding macro is _POSIX_NAME_MAX. |
| _PC_PATH_MAX |
| | returns the maximum length of a relative pathname when path or filedes is the current working directory. The corresponding macro is _POSIX_PATH_MAX. |
| _PC_PIPE_BUF |
| | returns the size of the pipe buffer, where filedes must refer to a pipe or FIFO and path must refer to a FIFO. The corresponding macro is _POSIX_PIPE_BUF. |
| _PC_CHOWN_RESTRICTED |
| | returns nonzero if the chown(2) call may not be used on this file. If filedes or path refer to a directory, then this applies to all files in that directory. The corresponding macro is _POSIX_CHOWN_RESTRICTED. |
| _PC_NO_TRUNC |
| | returns nonzero if accessing filenames longer than _POSIX_NAME_MAX generates an error. The corresponding macro is _POSIX_NO_TRUNC. |
| _PC_VDISABLE |
| | returns nonzero if special character processing can be disabled, where filedes or path must refer to a terminal. |
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