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
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
#include "helpfun.h"
unsigned long run_in_host = 0;
enum { RUN_IN_HOST = 0, RUN_IN_CONTAINER };
int is_pid_1_has_environ(const char *field) {
bool done = false;
FILE *f = NULL;
int r = 0;
size_t l;
assert(field);
f = fopen("/proc/1/environ", "re");
if (!f)
return 0;
(void)__fsetlocking(f, FSETLOCKING_BYCALLER);
l = strlen(field);
do {
char line[BUF_LEN];
size_t i;
for (i = 0; i < sizeof(line) - 1; i++) {
int c;
c = getc(f);
if ((c == EOF)) {
done = true;
break;
} else if (c == 0)
break;
line[i] = c;
}
line[i] = 0;
if (strneq(line, field, l) && line[l] == '=') {
r = 1;
goto out;
}
} while (!done);
out:
fclose(f);
return r;
}
int get_proc_field(const char *filename, const char *pattern,
const char *terminator, char **field) {
char status[BUF_LEN] = {0};
char *t, *f;
size_t len;
int r;
assert(terminator);
assert(filename);
assert(pattern);
assert(field);
int fd = open(filename, O_RDONLY);
if (fd < 0)
return -errno;
r = read(fd, &status, BUF_LEN - 1);
if (r < 0)
return r;
t = status;
do {
bool pattern_ok;
do {
t = strstr(t, pattern);
if (!t)
return -ENOENT;
/* Check that pattern occurs in beginning of line. */
pattern_ok = (t == status || t[-1] == '\n');
t += strlen(pattern);
} while (!pattern_ok);
t += strspn(t, " \t");
if (!*t)
return -ENOENT;
} while (*t != ':');
t++;
if (*t) {
t += strspn(t, " \t");
/* Also skip zeros, because when this is used for
* capabilities, we don't want the zeros. This way the
* same capability set always maps to the same string,
* irrespective of the total capability set size. For
* other numbers it shouldn't matter. */
t += strspn(t, "0");
/* Back off one char if there's nothing but whitespace
and zeros */
if (!*t || isspace(*t))
t--;
}
len = strcspn(t, terminator);
f = strndup(t, len);
if (!f)
return -ENOMEM;
*field = f;
return 0;
}
static int detect_container_by_pid_2(void) {
char *s = NULL;
int r;
r = get_proc_field("/proc/2/status", "PPid", WHITESPACE, &s);
if (r >= 0) {
if (streq(s, "0"))
r = RUN_IN_HOST;
else
r = RUN_IN_CONTAINER;
} else if (r == -ENOENT)
r = RUN_IN_CONTAINER;
else {
printf("Failed to read /proc/2/status: %d\n", r);
r = RUN_IN_HOST;
}
free(s);
return r;
}
int check_in_host(void) {
int r;
if (is_pid_1_has_environ("container"))
r = RUN_IN_CONTAINER;
else
r = detect_container_by_pid_2();
return r == RUN_IN_HOST;
}
static const char *user_mode_str(int user_mode) {
switch (user_mode) {
case 1:
return "USER MODE";
case 0:
return "SYSTEM MODE";
default:
return "UNKNOWN MODE";
}
}
std::string state_str(int __state) {
std::vector<std::string> states;
if (__state == TASK_RUNNING)
states.push_back("TASK_RUNNING");
// if (__state & TASK_RUNNING) states.push_back("TASK_RUNNING");
if (__state & TASK_INTERRUPTIBLE)
states.push_back("TASK_INTERRUPTIBLE");
if (__state & TASK_UNINTERRUPTIBLE)
states.push_back("TASK_UNINTERRUPTIBLE");
if (__state & __TASK_STOPPED)
states.push_back("__TASK_STOPPED");
if (__state & __TASK_TRACED)
states.push_back("__TASK_TRACED");
if (__state & TASK_PARKED)
states.push_back("TASK_PARKED");
if (__state & TASK_DEAD)
states.push_back("TASK_DEAD");
if (__state == TASK_KILLABLE)
states.push_back("TASK_KILLABLE");
if (__state == TASK_STOPPED)
states.push_back("TASK_STOPPED");
if (__state == TASK_IDLE)
states.push_back("TASK_IDLE");
std::string result;
for (const auto &state : states) {
if (!result.empty())
result += " | ";
result += state;
}
return result;
}
|
