Add grantpt(3).

libc/Makefile

@@ -528,6 +528,7 @@ stdlib/clearenv.o \
 stdlib/_Exit.o \
 stdlib/exit.o \
 stdlib/getenv.o \
+stdlib/grantpt.o \
 stdlib/mkdtemp.o \
 stdlib/mkdtemps.o \
 stdlib/mkostemp.o \

libc/include/stdlib.h

@@ -150,7 +150,6 @@ long a64l(const char* s);
 double drand48(void);
 double erand48(unsigned short [3]);
 int getsubopt(char**, char* const *, char**);
-int grantpt(int);
 char* initstate(unsigned, char*, size_t);
 long jrand48(unsigned short [3]);
 char* l64a(long);
@@ -170,6 +169,10 @@ void srandom(unsigned);
 int unlockpt(int);
 #endif
 
+#if __USE_SORTIX || __USE_XOPEN
+int grantpt(int);
+#endif
+
 #if __USE_SORTIX || 600 <= __USE_XOPEN
 int posix_openpt(int);
 #endif

libc/stdlib/grantpt.c

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2016 Jonas 'Sortie' Termansen.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * stdlib/grantpt.c
+ * Grant permissions to open the pseudoterminal slave.
+ */
+
+#include <stdlib.h>
+
+int grantpt(int fd)
+{
+	(void) fd;
+	return 0;
+}