Rework the kernel environment subsystem. We now convert the static

environment needed at boot time to a dynamic subsystem when VM is
up.  The dynamic kernel environment is protected by an sx lock.

This adds some new functions to manipulate the kernel environment :
freeenv(), setenv(), unsetenv() and testenv().  freeenv() has to be
called after every getenv() when you have finished using the string.
testenv() only tests if an environment variable is present, and
doesn't require a freeenv() call. setenv() and unsetenv() are self
explanatory.

The kenv(2) syscall exports these new functionalities to userland,
mainly for kenv(1).

Reviewed by:	peter

1 files changed, 4 insertions, 1 deletions

diff --git a/sys/kern/init_main.c b/sys/kern/init_main.c
index 4f0aa45..6904392 100644
--- a/sys/kern/init_main.c
+++ b/sys/kern/init_main.c
@@ -528,9 +528,12 @@ start_init(void *dummy)
 	if ((var = getenv("init_path")) != NULL) {
 		strncpy(init_path, var, sizeof init_path);
 		init_path[sizeof init_path - 1] = 0;
+		freeenv(var);
 	}
-	if ((var = getenv("kern.fallback_elf_brand")) != NULL)
+	if ((var = getenv("kern.fallback_elf_brand")) != NULL) {
 		fallback_elf_brand = strtol(var, NULL, 0);
+		freeenv(var);
+	}
 	
 	for (path = init_path; *path != '\0'; path = next) {
 		while (*path == ':')