Unix/Linux Go Back    


OpenDarwin 7.2.1 - man page for pathconf (opendarwin section 2)

Linux & Unix Commands - Search Man Pages
Man Page or Keyword Search:   man
Select Man Page Set:       apropos Keyword Search (sections above)


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

NAME
     pathconf, fpathconf -- get configurable pathname variables

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 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 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, other-
	     wise 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 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.

     [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 translating 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.

4th Berkeley Distribution		   June 4, 1993 		4th Berkeley Distribution
Unix & Linux Commands & Man Pages : ©2000 - 2018 Unix and Linux Forums


All times are GMT -4. The time now is 11:45 PM.