x20090325-1554

1 files changed, 65 insertions, 0 deletions

diff --git a/emu/port/dynldc.c b/emu/port/dynldc.c
new file mode 100644
index 00000000..2237f7ab
--- /dev/null
+++ b/emu/port/dynldc.c
@@ -0,0 +1,65 @@
+#include	"dat.h"
+#include	"fns.h"
+#include	"error.h"
+#include	<a.out.h>
+#include	<dynld.h>
+
+/*
+ * channel-based kernel interface to dynld, for use by devdynld.c,
+ * libinterp/dlm.c, and possibly others
+ */
+
+static long
+readfc(void *a, void *buf, long nbytes)
+{
+	Chan *c = a;
+
+	if(waserror())
+		return -1;
+	nbytes = devtab[c->type]->read(c, buf, nbytes, c->offset);
+	poperror();
+	return nbytes;
+}
+
+static vlong
+seekfc(void *a, vlong off, int t)
+{
+	Chan *c = a;
+
+	if(c->qid.type & QTDIR || off < 0)
+		return -1;	/* won't happen */
+	switch(t){
+	case 0:
+		lock(c);
+		c->offset = off;
+		unlock(c);
+		break;
+	case 1:
+		lock(c);
+		off += c->offset;
+		c->offset = off;
+		unlock(c);
+		break;
+	case 2:
+		return -1;	/* not needed */
+	}
+	return off;
+}
+
+static void
+errfc(char *s)
+{
+	kstrcpy(up->env->errstr, s, ERRMAX);
+}
+
+Dynobj*
+kdynloadchan(Chan *c, Dynsym *tab, int ntab)
+{
+	return dynloadgen(c, readfc, seekfc, errfc, tab, ntab, 0);
+}
+
+int
+kdynloadable(Chan *c)
+{
+	return dynloadable(c, readfc, seekfc);
+}