Allow to specify a character special device as a core file.

This enable us to use /dev/fwmem* as a core file.
e.g.
	ps -M /dev/fwmem0.0 -N kernel.debug
	dmesg -M /dev/fwmem0.0 -N kernel.debug
	gdb -k -c /dev/fwmem0.0 kernel.debug
You need to set target EUI64 in hw.firewire.fwmem.eui64_hi/lo before
opening the device. On the target arch, (PCI) bus address must be
equivalent to physical address.
(We cannot use this for sparc64 because of IOMMU.)

No objection in: -audit

1 files changed, 18 insertions, 21 deletions

diff --git a/lib/libkvm/kvm.c b/lib/libkvm/kvm.c
index dfce727..8f9c5b3 100644
--- a/lib/libkvm/kvm.c
+++ b/lib/libkvm/kvm.c
@@ -192,11 +192,8 @@ _kvm_open(kd, uf, mf, flag, errout)
 		 */
 		if (strcmp(mf, _PATH_DEVNULL) == 0) {
 			kd->vmfd = open(_PATH_DEVNULL, O_RDONLY);
-		} else if (strcmp(mf, _PATH_MEM) != 0) {
-			_kvm_err(kd, kd->program,
-				 "%s: not physical memory device", mf);
-			goto failed;
-		} else {
+			return (kd);
+		} else if (strcmp(mf, _PATH_MEM) == 0) {
 			if ((kd->vmfd = open(_PATH_KMEM, flag)) < 0) {
 				_kvm_syserr(kd, kd->program, "%s", _PATH_KMEM);
 				goto failed;
@@ -205,24 +202,24 @@ _kvm_open(kd, uf, mf, flag, errout)
 				_kvm_syserr(kd, kd->program, "%s", _PATH_KMEM);
 				goto failed;
 			}
+			return (kd);
 		}
-	} else {
-		/*
-		 * This is a crash dump.
-		 * Initialize the virtual address translation machinery,
-		 * but first setup the namelist fd.
-		 */
-		if ((kd->nlfd = open(uf, O_RDONLY, 0)) < 0) {
-			_kvm_syserr(kd, kd->program, "%s", uf);
-			goto failed;
-		}
-		if (fcntl(kd->nlfd, F_SETFD, FD_CLOEXEC) < 0) {
-			_kvm_syserr(kd, kd->program, "%s", uf);
-			goto failed;
-		}
-		if (_kvm_initvtop(kd) < 0)
-			goto failed;
 	}
+	/*
+	 * This is a crash dump.
+	 * Initialize the virtual address translation machinery,
+	 * but first setup the namelist fd.
+	 */
+	if ((kd->nlfd = open(uf, O_RDONLY, 0)) < 0) {
+		_kvm_syserr(kd, kd->program, "%s", uf);
+		goto failed;
+	}
+	if (fcntl(kd->nlfd, F_SETFD, FD_CLOEXEC) < 0) {
+		_kvm_syserr(kd, kd->program, "%s", uf);
+		goto failed;
+	}
+	if (_kvm_initvtop(kd) < 0)
+		goto failed;
 	return (kd);
 failed:
 	/*