You can query the path-specific configuration limits to determine some of
the properties and limits of a specific filesystem.
The full list of these limits is given in the reference for the
pathconf() QNX Neutrino library function.
The supported configurable filesystem limits include at least the following:
- _PC_LINK_MAX
- Maximum value of a file's link count.
- _PC_MAX_CANON
- Maximum number of bytes in a terminal's canonical input buffer (edit buffer).
- _PC_MAX_INPUT
- Maximum number of bytes in a terminal's raw input buffer.
- _PC_NAME_MAX
- Maximum number of bytes in a filename (not including the terminating null).
- _PC_PATH_MAX
- Maximum number of bytes in a pathname (not including the terminating null).
- _PC_PIPE_BUF
- Maximum number of bytes that can be written atomically when writing to a pipe.
- _PC_CHOWN_RESTRICTED
- If defined (not -1), indicates that the use of the chown()
function is restricted to a process with appropriate privileges, and to
changing the group ID of a file to the effective group ID of the
process or to one of its supplementary group IDs.
- _PC_NO_TRUNC
- If defined (not -1), indicates that the use of pathname components
longer than the value given by _PC_NAME_MAX will
generate an error.
- _PC_VDISABLE
- If defined (not -1), this is the character value that can be used to
individually disable special control characters in the
termios
control structure.
For more information, see
“Configurable limits,”
above.