Date: Sat, 6 Apr 1996 15:27:15 +0200 (MET DST) From: J Wunsch <j@uriah.heep.sax.de> To: freebsd-current@FreeBSD.org (FreeBSD-current users) Subject: devfs questions Message-ID: <199604061327.PAA00612@uriah.heep.sax.de>
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I've started playing with devfs. Find below a patch to init(8) that
should allow the system to come up with an empty /dev directory as
long as devfs is statically available in the kernel. It tries to
mount /dev early in the game, before the first device node
(/dev/console) is about to be accessed. I've at least been able to
run the single-user shell with it.
Alas, the next would be fsck'ing, and so the big question is: how are
the slice and partition entries supposed to be created?
I've also got a panic when trying to create a hardlink there, but have
yet to reproduce it again ("vrele: negative reference cnt"). The
previous core dump was unusable.
How hard will it be to get symlinks implemented?
Index: init/init.c
===================================================================
RCS file: /home/ncvs/src/sbin/init/init.c,v
retrieving revision 1.11
diff -u -u -r1.11 init.c
--- init.c 1995/11/10 07:06:59 1.11
+++ init.c 1996/04/06 12:44:10
@@ -45,6 +45,7 @@
#endif /* not lint */
#include <sys/param.h>
+#include <sys/mount.h>
#include <sys/sysctl.h>
#include <sys/wait.h>
@@ -125,6 +126,7 @@
state_t requested_transition = runcom;
void setctty __P((char *));
+void check_console __P((void));
typedef struct init_session {
int se_index; /* index of entry in ttys file */
@@ -546,6 +548,28 @@
}
/*
+ * Check for the existance of _PATH_CONSOLE. Try mounting devfs if it
+ * doesn't exist.
+ */
+void
+check_console()
+{
+ if (access(_PATH_CONSOLE, F_OK) == 0)
+ return;
+
+ if (getvfsbytype(MOUNT_DEVFS) == NULL) {
+ stall("%s does not exist, and \"devfs\" is not available",
+ _PATH_CONSOLE);
+ _exit(1);
+ }
+ if (mount(MOUNT_DEVFS, _PATH_DEV_MNTPNT, 0, NULL) == -1) {
+ stall("cannot mount \"devfs\", errno = %d",
+ errno);
+ _exit(1);
+ }
+}
+
+/*
* Bring the system up single user.
*/
state_func_t
@@ -583,6 +607,7 @@
/*
* Start the single user session.
*/
+ check_console();
setctty(_PATH_CONSOLE);
#ifdef SECURE
@@ -716,6 +741,7 @@
(void) sigaction(SIGTSTP, &sa, (struct sigaction *)0);
(void) sigaction(SIGHUP, &sa, (struct sigaction *)0);
+ check_console();
setctty(_PATH_CONSOLE);
argv[0] = "sh";
Index: init/pathnames.h
===================================================================
RCS file: /home/ncvs/src/sbin/init/pathnames.h,v
retrieving revision 1.1.1.1
diff -u -u -r1.1.1.1 pathnames.h
--- pathnames.h 1994/05/26 06:34:19 1.1.1.1
+++ pathnames.h 1996/04/06 12:43:42
@@ -40,3 +40,4 @@
#define _PATH_SLOGGER "/sbin/session_logger"
#define _PATH_RUNCOM "/etc/rc"
+#define _PATH_DEV_MNTPNT "/dev" /* _PATH_DEV has a trailing slash */
--
cheers, J"org
joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)
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