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Various quibbles:

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- Print a diagnostic if kdumpenv() fails.  This can occur due to MAC
  restrictions or lack of memory.  Catch all kenv(2) failures as well.
- Just of the heck of it, DTRT if the kernel environment size changes
  at the wrong time.  The old code could fail silently or fail to
  null-terminate a buffer if you got exceptionally unlucky.
- Sort and GC the #includes.
This commit is contained in:
David Schultz 2004-04-28 01:27:36 +00:00
parent 06afcd9d10
commit 87a99f5ff2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=128698
1 changed files with 28 additions and 15 deletions
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43
bin/kenv/kenv.c
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@ -28,12 +28,11 @@ __FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/sysctl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <err.h>
#include <kenv.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
static void usage(void);
@ -92,9 +91,11 @@ main(int argc, char **argv)
usage();
if ((argc > 0) || (uflag && (env == NULL)))
usage();
if (env == NULL)
kdumpenv();
else if (val == NULL) {
if (env == NULL) {
error = kdumpenv();
if (error)
warn("kdumpenv");
} else if (val == NULL) {
if (uflag) {
error = kunsetenv(env);
if (error)
@ -116,16 +117,28 @@ static int
kdumpenv()
{
char *buf, *cp;
int len;
int buflen, envlen;
len = kenv(KENV_DUMP, NULL, NULL, 0);
len = len * 120 / 100;
buf = malloc(len);
if (buf == NULL)
envlen = kenv(KENV_DUMP, NULL, NULL, 0);
if (envlen < 0)
return (-1);
/* Be defensive */
memset(buf, 0, len);
kenv(KENV_DUMP, NULL, buf, len);
for (;;) {
buflen = envlen * 120 / 100;
buf = malloc(buflen + 1);
if (buf == NULL)
return (-1);
memset(buf, 0, buflen + 1); /* Be defensive */
envlen = kenv(KENV_DUMP, NULL, buf, buflen);
if (envlen < 0) {
free(buf);
return (-1);
}
if (envlen > buflen)
free(buf);
else
break;
}
for (; *buf != '\0'; buf += strlen(buf) + 1) {
if (hflag) {
if (strncmp(buf, "hint.", 5) != 0)