revpath(1) [xfree86 man page]

REVPATH(1)						      General Commands Manual							REVPATH(1)

NAME

       revpath - generate a relative path that can be used to undo a change-directory

SYNOPSIS

       revpath path

DESCRIPTION

       The  revpath program prints out a relative path that is the ``reverse'' or ``inverse'' of path.	Start with two directories top and bottom,
       with the latter below the former, and path is the location of bottom relative to top.  The output of revpath is the location of	top  rela-
       tive  to  bottom.   The resulting path contains a trailing `/' character when the result is non-trivial.  If path is equivalent to `.', the
       resulting output is empty.  If path is invalid in some way (e.g., doesn't represent the path to a subdirectory) the output  is  also  empty
       and no error messages are ever generated.

DIAGNOSTICS

       There are no diagnostics.  Error conditions are silently ignored, and the exit status is always 0.

BUGS

       It  isn't  possible  to	reverse  arbitrary relative paths.  If any path element between the two end points of path is a symbolic link, the
       results will probably be incorrect.

XFree86 							   Version 4.7.0							REVPATH(1)

resolvepath(2)							   System Calls 						    resolvepath(2)

NAME

       resolvepath - resolve all symbolic links of a path name

SYNOPSIS

       #include <unistd.h>

       int resolvepath(const char *path, char *buf, size_t bufsiz);

DESCRIPTION

       The  resolvepath()  function  fully resolves all symbolic links in the path name path into a resulting path name free of symbolic links and
       places the resulting path name in the buffer buf which has size bufsiz. The resulting path name names the same file  or	directory  as  the
       original  path  name.  All ``.'' components are eliminated and every non-leading ``..'' component is eliminated together with its preceding
       directory component. If leading ``..'' components reach to the root directory, they are replaced by ``/''. If the number of  bytes  in  the
       resulting path name is less than bufsiz, the contents of the remainder of buf are unspecified.

RETURN VALUES

       Upon  successful  completion,  resolvepath()  returns the count of bytes placed in the buffer. Otherwise, it returns  -1, leaves the buffer
       unchanged, and sets errno to indicate the error.

ERRORS

       The resolvepath() function will fail if:

       EACCES		       Search permission is denied for a component of the path prefix of path or for a	path  prefix  component  resulting
			       from the resolution of a symbolic link.

       EFAULT		       The path or buf argument points to an illegal address.

       EIO		       An I/O error occurred while reading from the file system.

       ENOENT		       The  path  argument is an empty string or a component of path or a path name component produced by resolving a sym-
			       bolic link does not name an existing file.

       ELOOP		       Too many symbolic links were encountered in resolving path.

       ENAMETOOLONG	       The length of path exceeds PATH_MAX, or a path name component is longer than NAME_MAX. Path name  resolution  of  a
			       symbolic  link  produced  an  intermediate result whose length exceeds PATH_MAX or a component whose length exceeds
			       NAME_MAX.

       ENOTDIR		       A component of the path prefix of path or of a path prefix component resulting from the resolution  of  a  symbolic
			       link is not a directory.

USAGE

       No more than PATH_MAX bytes will be placed in the buffer. Applications should not assume that the returned contents of the buffer are null-
       terminated.

SEE ALSO

       readlink(2), realpath(3C)

SunOS 5.10							    12 May 1997 						    resolvepath(2)