DESCRIPTION

     fpathconf() gets a value for the configuration  option  name
     for the open file descriptor filedes.

     pathconf() gets a value for configuration  option  name  for
     the file name path.

     The corresponding macros defined in <unistd.h>  are  minimum
     values;  if an application wants to take advantage of values
     which may change, a call to fpathconf() or pathconf() can be
     made, which may yield more liberal results.

     Setting name equal to one of the following constants returns
     the following configuration options:

     _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  direc-
          tory  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 termi-
          nal.

RETURN VALUE

     The limit is returned, if one exists.  If  the  system  does
     not have a limit for the requested resource, -1 is returned,
     and errno is  unchanged.   If  there  is  an  error,  -1  is
     returned,  and  errno  is  set  to reflect the nature of the
     error.

CONFORMING TO

     POSIX.1

NOTES

     Files with name lengths longer than the value  returned  for
     name equal to _PC_NAME_MAX may exist in the given directory.

     Some returned values may be huge; they are not suitable  for
     allocating memory.

SEE ALSO

     getconf(1), statfs(2), open(2),