new modules for SunOS 4

[ppp.git] / sunos4 / ppp_vdcmd.c

diff --git a/sunos4/ppp_vdcmd.c b/sunos4/ppp_vdcmd.c
new file mode 100644 (file)
index 0000000..eeaa039
--- /dev/null
+++ b/sunos4/ppp_vdcmd.c
@@ -0,0 +1,65 @@
+#include <sys/types.h>
+#include <sys/errno.h>
+#include <sys/conf.h>
+#include <sun/vddrv.h>
+
+extern struct streamtab pppinfo;
+extern int ppp_count;
+extern int nchrdev;
+
+static struct vdldrv vd = {
+    VDMAGIC_PSEUDO,
+    "ppp"
+};
+
+extern int nodev();
+
+static struct cdevsw ppp_cdevsw = {
+    nodev, nodev, nodev, nodev, nodev, nodev, nodev, 0,
+    &pppinfo
+};
+
+static struct cdevsw old_entry;
+
+int
+ppp_vdcmd(fun, vdp, vdi, vds)
+    unsigned int fun;
+    struct vddrv *vdp;
+    addr_t vdi;
+    struct vdstat *vds;
+{
+    int n, maj;
+
+    switch (fun) {
+    case VDLOAD:
+       /*
+        * It seems like modload doesn't install the cdevsw entry
+        * for us.  Oh well...
+        */
+       for (maj = 1; maj < nchrdev; ++maj)
+           if (cdevsw[maj].d_open == &vd_unuseddev)
+               break;
+       if (maj >= nchrdev)
+           return ENODEV;
+       vd.Drv_charmajor = maj;
+       old_entry = cdevsw[maj];
+       cdevsw[maj] = ppp_cdevsw;
+       vd.Drv_cdevsw = &ppp_cdevsw;
+       vdp->vdd_vdtab = (struct vdlinkage *) &vd;
+       break;
+
+    case VDUNLOAD:
+       if (ppp_count > 0)
+           return EBUSY;
+       if (vd.Drv_charmajor > 0)
+           cdevsw[vd.Drv_charmajor] = old_entry;
+       break;
+
+    case VDSTAT:
+       break;
+
+    default:
+       return EIO;
+    }
+    return 0;
+}