Querying filesystem limits

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 OS 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.