mojave man page for dirname_r

DIRNAME(3)						   BSD Library Functions Manual 						DIRNAME(3)

NAME
     dirname -- extract the directory part of a pathname

SYNOPSIS
     #include <libgen.h>

     char *
     dirname(char *path);

     char *
     dirname_r(const char *path, char *dname);

DESCRIPTION
     The dirname() function is the converse of basename(3); it returns a pointer to the parent directory of the pathname pointed to by path.  Any
     trailing '/' characters are not counted as part of the directory name.  If path is a null pointer, the empty string, or contains no '/' char-
     acters, dirname() returns a pointer to the string ".", signifying the current directory.

IMPLEMENTATION NOTES
     The dirname() function returns a pointer to internal storage space allocated on the first call that will be overwritten by subsequent calls.
     dirname_r() is therefore preferred for threaded applications.

     Other vendor implementations of dirname() may modify the contents of the string passed to dirname(); if portability is desired, this should
     be taken into account when writing code which calls this function.

LEGACY SYNOPSIS
     #include <libgen.h>

     char *
     dirname(const char *path);

     In legacy mode, path will not be changed.

RETURN VALUES
     On successful completion, dirname() returns a pointer to the parent directory of path.

     If dirname() fails, a null pointer is returned and the global variable errno is set to indicate the error.

ERRORS
     The following error codes may be set in errno:

     [ENAMETOOLONG]	The path component to be returned was larger than MAXPATHLEN.

     [ENOMEM]		The static buffer used for storing the path in dirname() could not be allocated.

SEE ALSO
     basename(1), dirname(1), basename(3), compat(5)

STANDARDS
     The dirname() function conforms to X/Open Portability Guide Issue 4, Version 2 (``XPG4.2'').

HISTORY
     The dirname() function first appeared in OpenBSD 2.2 and FreeBSD 4.2.  The dirname_r() function first appeared in OS X 10.12.

AUTHORS
     Todd C. Miller

BSD
								 October 12, 2006							       BSD