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
|
#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif
#include <sched.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/resource.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <dirent.h>
#include "proc.h"
#include "die.h"
void cpu_affinity(int cpu)
{
int ret;
cpu_set_t cpu_bitmask;
CPU_ZERO(&cpu_bitmask);
CPU_SET(cpu, &cpu_bitmask);
ret = sched_setaffinity(getpid(), sizeof(cpu_bitmask),
&cpu_bitmask);
if (ret)
panic("Can't set this cpu affinity!\n");
}
int set_proc_prio(int priority)
{
int ret = setpriority(PRIO_PROCESS, getpid(), priority);
if (ret)
panic("Can't set nice val to %i!\n", priority);
return 0;
}
int set_sched_status(int policy, int priority)
{
int ret, min_prio, max_prio;
struct sched_param sp;
max_prio = sched_get_priority_max(policy);
min_prio = sched_get_priority_min(policy);
if (max_prio == -1 || min_prio == -1)
printf("Cannot determine scheduler prio limits!\n");
else if (priority < min_prio)
priority = min_prio;
else if (priority > max_prio)
priority = max_prio;
memset(&sp, 0, sizeof(sp));
sp.sched_priority = priority;
ret = sched_setscheduler(getpid(), policy, &sp);
if (ret) {
printf("Cannot set scheduler policy!\n");
return -EINVAL;
}
ret = sched_setparam(getpid(), &sp);
if (ret) {
printf("Cannot set scheduler prio!\n");
return -EINVAL;
}
return 0;
}
ssize_t proc_get_cmdline(unsigned int pid, char *cmdline, size_t len)
{
ssize_t ret;
char path[1024];
snprintf(path, sizeof(path), "/proc/%u/exe", pid);
ret = readlink(path, cmdline, len - 1);
if (ret < 0)
cmdline[0] = '\0';
else
cmdline[ret] = '\0';
return ret;
}
static int match_pid_by_inode(pid_t pid, ino_t ino)
{
struct dirent *ent;
char path[1024];
DIR *dir;
if (snprintf(path, sizeof(path), "/proc/%u/fd", pid) == -1)
panic("giant process name! %u\n", pid);
dir = opendir(path);
if (!dir)
return -1;
while ((ent = readdir(dir))) {
struct stat statbuf;
if (snprintf(path, sizeof(path), "/proc/%u/fd/%s",
pid, ent->d_name) < 0)
continue;
if (stat(path, &statbuf) < 0)
continue;
if (S_ISSOCK(statbuf.st_mode) && ino == statbuf.st_ino) {
closedir(dir);
return 0;
}
}
closedir(dir);
return -1;
}
int proc_find_by_inode(ino_t ino, char *cmdline, size_t len, pid_t *pid)
{
struct dirent *ent;
DIR *dir;
if (ino <= 0) {
cmdline[0] = '\0';
return 0;
}
dir = opendir("/proc");
if (!dir)
panic("Cannot open /proc: %s\n", strerror(errno));
while ((ent = readdir(dir))) {
int ret;
char *end;
const char *name = ent->d_name;
pid_t cur_pid = strtoul(name, &end, 10);
/* not a PID */
if (cur_pid == 0 && end == name)
continue;
ret = match_pid_by_inode(cur_pid, ino);
if (!ret) {
ret = proc_get_cmdline(cur_pid, cmdline, len);
if (ret < 0)
panic("Failed to get process cmdline: %s\n", strerror(errno));
closedir(dir);
*pid = cur_pid;
return ret;
}
}
closedir(dir);
return -1;
}
int proc_exec(const char *proc, char *const argv[])
{
int status;
pid_t pid;
pid = fork();
if (pid < 0) {
perror("fork");
return -1;
} else if (pid == 0) {
if (execvp(proc, argv) < 0)
fprintf(stderr, "Failed to exec: %s\n", proc);
_exit(1);
}
if (waitpid(pid, &status, 0) < 0) {
perror("waitpid");
return -2;
}
if (!WIFEXITED(status))
return -WEXITSTATUS(status);
return 0;
}
bool proc_exists(pid_t pid)
{
struct stat statbuf;
char path[1024];
if (snprintf(path, sizeof(path), "/proc/%u", pid) < 0)
return false;
return stat(path, &statbuf) == 0;
}
|
