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ape: provide bogus chroot implementation

--- a/sys/include/ape/unistd.h

+++ b/sys/include/ape/unistd.h

@@ -121,6 +121,7 @@

 /* files and directories */

 extern int chdir(const char *);

+extern int chroot(const char *);

 extern int link(const char *, const char *);

 extern char *getcwd(char *, size_t);

 extern int unlink(const char *);

--- /dev/null

+++ b/sys/src/ape/lib/ap/plan9/chroot.c

@@ -1,0 +1,9 @@

+#include <unistd.h>

+#include <errno.h>

+

+int

+chroot(const char*)

+{

+	errno = EIO;

+	return -1;

+}

--- a/sys/src/ape/lib/ap/plan9/mkfile

+++ b/sys/src/ape/lib/ap/plan9/mkfile

@@ -22,6 +22,7 @@

 	brk.$O\

 	cfgetospeed.$O\

 	chdir.$O\

+	chroot.$O\

 	chmod.$O\

 	chown.$O\

 	close.$O\