1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
#include "inc.h"
#include <sys/svrctl.h>
const char *
svrctl_name(unsigned long req)
{
switch (req) {
NAME(PMSETPARAM);
NAME(PMGETPARAM);
NAME(VFSGETPARAM);
NAME(VFSSETPARAM);
}
return NULL;
}
int
svrctl_arg(struct trace_proc * proc, unsigned long req, void * ptr, int dir)
{
struct sysgetenv *env;
switch (req) {
case PMSETPARAM:
case VFSSETPARAM:
if ((env = (struct sysgetenv *)ptr) == NULL)
return IF_OUT;
put_buf(proc, "key", PF_STRING, (vir_bytes)env->key,
env->keylen);
put_buf(proc, "value", PF_STRING, (vir_bytes)env->val,
env->vallen);
return IF_ALL;
case PMGETPARAM:
case VFSGETPARAM:
if ((env = (struct sysgetenv *)ptr) == NULL)
return IF_OUT | IF_IN;
/*
* So far this is the only IOCTL case where the output depends
* on one of the values in the input: if the given key is NULL,
* PM provides the entire system environment in return, which
* means we cannot just print a single string. We rely on PM
* not changing the key field, which (while true) is an
* assumption. With the current (simple) model we would have
* to save the provided key pointer somewhere otherwise.
*/
if (dir == IF_OUT)
put_buf(proc, "key", PF_STRING, (vir_bytes)env->key,
env->keylen);
else
put_buf(proc, "value",
(env->key != NULL) ? PF_STRING : 0,
(vir_bytes)env->val, env->vallen);
return IF_ALL;
default:
return 0;
}
}
|
