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PATHCONF(2)		    BSD	System Calls Manual		   PATHCONF(2)

NAME
     pathconf, fpathconf -- get	configurable pathname variables

LIBRARY
     Standard C	Library	(libc, -lc)

SYNOPSIS
     #include <unistd.h>

     long
     pathconf(const char *path,	int name);

     long
     fpathconf(int fd, int name);

DESCRIPTION
     The pathconf() and	fpathconf() functions provides a method	for applica-
     tions to determine	the current value of a configurable system limit or
     option variable associated	with a pathname	or file	descriptor.

     For pathconf(), the path argument is the name of a	file or	directory.
     For fpathconf(), the fd argument is an open file descriptor.  The name
     argument specifies	the system variable to be queried.  Symbolic constants
     for each name value are found in the include file <unistd.h>.

     The available values are as follows:

     _PC_LINK_MAX
	     The maximum file link count.

     _PC_MAX_CANON
	     The maximum number	of bytes in terminal canonical input line.

     _PC_MAX_INPUT
	     The minimum maximum number	of bytes for which space is available
	     in	a terminal input queue.

     _PC_NAME_MAX
	     The maximum number	of bytes in a file name.

     _PC_PATH_MAX
	     The maximum number	of bytes in a pathname.

     _PC_PIPE_BUF
	     The maximum number	of bytes which will be written atomically to a
	     pipe.

     _PC_CHOWN_RESTRICTED
	     Return 1 if appropriate privileges	are required for the chown(2)
	     system call, otherwise 0.

     _PC_NO_TRUNC
	     Return 1 if file names longer than	KERN_NAME_MAX are truncated.

     _PC_VDISABLE
	     Returns the terminal character disabling value.

RETURN VALUES
     If	the call to pathconf() or fpathconf() is not successful, -1 is re-
     turned and	errno is set appropriately.  Otherwise,	if the variable	is as-
     sociated with functionality that does not have a limit in the system, -1
     is	returned and errno is not modified.  Otherwise,	the current variable
     value is returned.

ERRORS
     If	any of the following conditions	occur, the pathconf() and fpathconf()
     functions shall return -1 and set errno to	the corresponding value.

     [EINVAL]		The value of the name argument is invalid.

     [EINVAL]		The implementation does	not support an association of
			the variable name with the associated file.

     Pathconf()	will fail if:

     [ENOTDIR]		A component of the path	prefix is not a	directory.

     [ENAMETOOLONG]	A component of a pathname exceeded 255 characters, or
			an entire path name exceeded 1023 characters.

     [ENOENT]		The named file does not	exist.

     [EACCES]		Search permission is denied for	a component of the
			path prefix.

     [ELOOP]		Too many symbolic links	were encountered in translat-
			ing the	pathname.

     [EIO]		An I/O error occurred while reading from or writing to
			the file system.

     Fpathconf() will fail if:

     [EBADF]		fd is not a valid open file descriptor.

     [EIO]		An I/O error occurred while reading from or writing to
			the file system.

SEE ALSO
     sysctl(3)

HISTORY
     The pathconf() and	fpathconf() functions first appeared in	4.4BSD.

BSD				 June 4, 1993				   BSD
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | HISTORY

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