auto import from //depot/cupcake/@135843
diff --git a/sh/exec.h b/sh/exec.h
new file mode 100644
index 0000000..26fd09c
--- /dev/null
+++ b/sh/exec.h
@@ -0,0 +1,79 @@
+/* $NetBSD: exec.h,v 1.21 2003/08/07 09:05:31 agc Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#)exec.h 8.3 (Berkeley) 6/8/95
+ */
+
+/* values of cmdtype */
+#define CMDUNKNOWN -1 /* no entry in table for command */
+#define CMDNORMAL 0 /* command is an executable program */
+#define CMDFUNCTION 1 /* command is a shell function */
+#define CMDBUILTIN 2 /* command is a shell builtin */
+#define CMDSPLBLTIN 3 /* command is a special shell builtin */
+
+
+struct cmdentry {
+ int cmdtype;
+ union param {
+ int index;
+ int (*bltin)(int, char**);
+ union node *func;
+ } u;
+};
+
+
+/* action to find_command() */
+#define DO_ERR 0x01 /* prints errors */
+#define DO_ABS 0x02 /* checks absolute paths */
+#define DO_NOFUNC 0x04 /* don't return shell functions, for command */
+#define DO_ALTPATH 0x08 /* using alternate path */
+#define DO_ALTBLTIN 0x20 /* %builtin in alt. path */
+
+extern const char *pathopt; /* set by padvance */
+
+void shellexec(char **, char **, const char *, int, int)
+ __attribute__((__noreturn__));
+char *padvance(const char **, const char *);
+int hashcmd(int, char **);
+void find_command(char *, struct cmdentry *, int, const char *);
+int (*find_builtin(char *))(int, char **);
+int (*find_splbltin(char *))(int, char **);
+void hashcd(void);
+void changepath(const char *);
+void deletefuncs(void);
+void getcmdentry(char *, struct cmdentry *);
+void addcmdentry(char *, struct cmdentry *);
+void defun(char *, union node *);
+int unsetfunc(char *);
+int typecmd(int, char **);
+void hash_special_builtins(void);