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posix, 9front: add (getpid) builtin

--- a/src/plan9/sys.c

+++ b/src/plan9/sys.c

@@ -109,6 +109,13 @@

 	sys_setcallpc(dummy);

 }

+BUILTIN("getpid", getpid)

+{

+	USED(args);

+	argcount(nargs, 0);

+	return fixnum(getpid());

+}

+

 void

 sys_init(void)

 {

--- a/src/posix/sys.c

+++ b/src/posix/sys.c

@@ -108,6 +108,13 @@

 	sys_setcallpc(dummy);

 }

+BUILTIN("getpid", getpid)

+{

+	USED(args);

+	argcount(nargs, 0);

+	return fixnum(getpid());

+}

+

 void

 sys_init(void)

 {