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Make getenv_*() functions and respectively TUNABLE_*_FETCH() macros not

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allocate memory and so not require sleepable environment.  getenv() has
already used on-stack temporary storage, so just use it more rationally.
getenv_string() receives buffer as argument, so don't need another one.
This commit is contained in:
Alexander Motin 2013-11-01 10:32:33 +00:00
parent 586904c22e
commit 915f2b7c89
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=257501
1 changed files with 19 additions and 27 deletions
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46
sys/kern/kern_environment.c
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@ -315,20 +315,12 @@ char *
getenv(const char *name)
{
char buf[KENV_MNAMELEN + 1 + KENV_MVALLEN + 1];
char *ret, *cp;
int len;
char *ret;
if (dynamic_kenv) {
mtx_lock(&kenv_lock);
cp = _getenv_dynamic(name, NULL);
if (cp != NULL) {
strcpy(buf, cp);
mtx_unlock(&kenv_lock);
len = strlen(buf) + 1;
ret = malloc(len, M_KENV, M_WAITOK);
strcpy(ret, buf);
if (getenv_string(name, buf, sizeof(buf))) {
ret = strdup(buf, M_KENV);
} else {
mtx_unlock(&kenv_lock);
ret = NULL;
WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,
"getenv");
@ -458,15 +450,20 @@ unsetenv(const char *name)
int
getenv_string(const char *name, char *data, int size)
{
char *tmp;
char *cp;
tmp = getenv(name);
if (tmp != NULL) {
strlcpy(data, tmp, size);
freeenv(tmp);
return (1);
} else
return (0);
if (dynamic_kenv) {
mtx_lock(&kenv_lock);
cp = _getenv_dynamic(name, NULL);
if (cp != NULL)
strlcpy(data, cp, size);
mtx_unlock(&kenv_lock);
} else {
cp = _getenv_static(name);
if (cp != NULL)
strlcpy(data, cp, size);
}
return (cp != NULL);
}
/*
@ -535,18 +532,15 @@ getenv_ulong(const char *name, unsigned long *data)
int
getenv_quad(const char *name, quad_t *data)
{
char *value;
char value[KENV_MNAMELEN + 1 + KENV_MVALLEN + 1];
char *vtp;
quad_t iv;
value = getenv(name);
if (value == NULL)
if (!getenv_string(name, value, sizeof(value)))
return (0);
iv = strtoq(value, &vtp, 0);
if (vtp == value || (vtp[0] != '\0' && vtp[1] != '\0')) {
freeenv(value);
if (vtp == value || (vtp[0] != '\0' && vtp[1] != '\0'))
return (0);
}
switch (vtp[0]) {
case 't': case 'T':
iv *= 1024;
@ -559,11 +553,9 @@ getenv_quad(const char *name, quad_t *data)
case '\0':
break;
default:
freeenv(value);
return (0);
}
*data = iv;
freeenv(value);
return (1);
}