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NetBSD 6.1.5 - man page for realpath (netbsd section 3)

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REALPATH(3)			   BSD Library Functions Manual 		      REALPATH(3)

     realpath -- returns the canonicalized absolute pathname

     Standard C Library (libc, -lc)

     #include <sys/param.h>
     #include <stdlib.h>

     char *
     realpath(const char * restrict pathname, char * restrict resolvedname);

     The realpath() function resolves all symbolic links, extra ``/'' characters and references
     to /./ and /../ in pathname, and copies the resulting absolute pathname into the memory ref-
     erenced by resolvedname.  The resolvedname argument must refer to a buffer capable of stor-
     ing at least MAXPATHLEN characters.

     The realpath() function will resolve both absolute and relative paths and return the abso-
     lute pathname corresponding to pathname.

     If resolvednamed is NULL, it will be allocated and the returned pointer can be deallocated
     using free(3).  The realpath() function returns resolvedname on success.  If an error
     occurs, realpath() returns NULL, and resolvedname was not allocated by realpath, it will
     contain the pathname which caused the problem.

     The function realpath() may fail and set the external variable errno for any of the errors
     specified for the library functions chdir(2), close(2), fchdir(2), lstat(2), malloc(3),
     open(2), readlink(2) and getcwd(3).


     realpath() first appeared in X/Open Portability Guide Issue 4, Version 2 (``XPG4.2'') and is
     part of IEEE Std 1003.1-2001 (``POSIX.1'').

     The realpath() function call first appeared in 4.4BSD.  In NetBSD 7.0 the function was
     updated to accept a NULL pointer for the resolvedname argument.

     This implementation of realpath() differs slightly from the Solaris implementation.  The
     4.4BSD version always returns absolute pathnames, whereas the Solaris implementation will,
     under certain circumstances, return a relative resolvedname when given a relative pathname.

BSD					  June 21, 2012 				      BSD
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