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NetBSD 6.1.5 - man page for pathconf (netbsd section 2)

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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 provide a method for applications 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 <unistd.h> header.

     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 filename, not including a terminating null charac-
	     ter.

     _PC_PATH_MAX
	     The maximum number of bytes in a pathname, including the terminating null character.

     _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, other-
	     wise 0.

     _PC_NO_TRUNC
	     Return 0 if filenames longer than {NAME_MAX} are silently truncated, or non-zero if
	     an error is generated when {NAME_MAX} is exceeded.

     _PC_VDISABLE
	     Returns the terminal character disabling value.

     _PC_SYNC_IO
	     Returns 1 if synchronized I/O is supported, otherwise 0.

     _PC_FILESIZEBITS
	     If the maximum size file that could ever exist on the mounted file system is
	     maxsize, then the returned value is 2 plus the floor of the base 2 logarithm of
	     maxsize.

     _PC_SYMLINK_MAX
	     The maximum number of bytes in a symbolic link.

     _PC_2_SYMLINKS
	     When referring to a directory the system supports the creation of symbolic links
	     within that directory; for nondirectory files, the meaning of {_PC_2_SYMLINKS} is
	     undefined.

RETURN VALUES
     If the call to pathconf or fpathconf is not successful, -1 is returned and errno is set
     appropriately.  Otherwise, if the variable is associated with functionality that does not
     have a limit in the system, -1 is returned and errno is not modified.  Otherwise, the cur-
     rent 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, or the implementation does not
			support an association of the variable name with the associated file.

     pathconf() will fail if:

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

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

     [ELOOP]	     Too many symbolic links were encountered in translating the pathname.

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

     [ENOENT]	     The named file does not exist.

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

     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)

STANDARDS
     The pathconf() and fpathconf() functions conform to ISO/IEC 9945-1:1990 (``POSIX.1'').

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

BSD					  July 26, 2010 				      BSD
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