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
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
|
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <hurd/process.h>
#include <hurd/resource.h>
#include <mach/vm_param.h>
#include <ps.h>
#include "procfs.h"
#include "procfs_dir.h"
#include "process.h"
/* Implementations for the process_file_desc.get_contents callback. */
static char *
process_file_gc_cmdline (struct proc_stat *ps, size_t *len)
{
*len = proc_stat_args_len(ps);
return proc_stat_args(ps);
}
static char *
process_file_gc_environ (struct proc_stat *ps, size_t *len)
{
*len = proc_stat_args_len(ps);
return proc_stat_args(ps);
}
static char state_char (struct proc_stat *ps)
{
int i;
for (i = 0; (1 << i) & (PSTAT_STATE_P_STATES | PSTAT_STATE_T_STATES); i++)
if (proc_stat_state (ps) & (1 << i))
return proc_stat_state_tags[i];
return '?';
}
static long int sc_tv (time_value_t tv)
{
double usecs = ((double) tv.seconds) * 1000000 + tv.microseconds;
return usecs * sysconf(_SC_CLK_TCK) / 1000000;
}
static long long int jiff_tv (time_value_t tv)
{
double usecs = ((double) tv.seconds) * 1000000 + tv.microseconds;
/* Let's say a jiffy is 1/100 of a second.. */
return usecs * 100 / 1000000;
}
static char *
process_file_gc_stat (struct proc_stat *ps, size_t *len)
{
struct procinfo *pi = proc_stat_proc_info (ps);
task_basic_info_t tbi = proc_stat_task_basic_info (ps);
thread_basic_info_t thbi = proc_stat_thread_basic_info (ps);
char *contents;
/* See proc(5) for more information about the contents of each field for the
Linux procfs. */
*len = asprintf (&contents,
"%d (%s) %c " /* pid, command, state */
"%d %d %d " /* ppid, pgid, session */
"%d %d " /* controling tty stuff */
"%u " /* flags, as defined by <linux/sched.h> */
"%lu %lu %lu %lu " /* page fault counts */
"%lu %lu %ld %ld " /* user/sys times, in sysconf(_SC_CLK_TCK) */
"%d %d " /* scheduler params (priority, nice) */
"%d %ld " /* number of threads, [obsolete] */
"%llu " /* start time since boot (jiffies) */
"%lu %ld %lu " /* virtual size (bytes), rss (pages), rss lim */
"%lu %lu %lu %lu %lu " /* some vm addresses (code, stack, sp, pc) */
"%lu %lu %lu %lu " /* pending, blocked, ignored and caught sigs */
"%lu " /* wait channel */
"%lu %lu " /* swap usage (not maintained in Linux) */
"%d " /* exit signal, to be sent to the parent */
"%d " /* last processor used */
"%u %u " /* RT priority and policy */
"%llu " /* aggregated block I/O delay */
"\n",
proc_stat_pid (ps), proc_stat_args (ps), state_char (ps),
pi->ppid, pi->pgrp, pi->session,
0, 0, /* no such thing as a major:minor for ctty */
0, /* no such thing as CLONE_* flags on Hurd */
0L, 0L, 0L, 0L, /* TASK_EVENTS_INFO is unavailable on GNU Mach */
sc_tv (thbi->user_time), sc_tv (thbi->system_time),
0L, 0L, /* cumulative time for children */
MACH_PRIORITY_TO_NICE(thbi->base_priority) + 20,
MACH_PRIORITY_TO_NICE(thbi->base_priority),
pi->nthreads, 0L,
jiff_tv (thbi->creation_time), /* FIXME: ... since boot */
(long unsigned int) tbi->virtual_size,
(long unsigned int) tbi->resident_size / PAGE_SIZE, 0L,
0L, 0L, 0L, 0L, 0L,
0L, 0L, 0L, 0L,
(long unsigned int) proc_stat_thread_rpc (ps), /* close enough */
0L, 0L,
0,
0,
0, 0,
0LL);
return len >= 0 ? contents : NULL;
}
/* Describes a file in a process directory. This is used as an "entry hook"
* for our procfs_dir entry table, passed to process_file_make_node. */
struct process_file_desc
{
/* The proc_stat information required to get the contents of this file. */
ps_flags_t needs;
/* Once we have acquired the necessary information, there can be only
memory allocation errors, hence this simplified signature. */
char *(*get_contents) (struct proc_stat *ps, size_t *len);
/* The cmdline and environ contents don't need any cleaning since they are
part of a proc_stat structure. */
int no_cleanup;
};
/* Information associated to an actual file node. */
struct process_file_node
{
const struct process_file_desc *desc;
struct proc_stat *ps;
};
static error_t
process_file_get_contents (void *hook, void **contents, size_t *contents_len)
{
struct process_file_node *file = hook;
error_t err;
err = proc_stat_set_flags (file->ps, file->desc->needs);
if (err)
return EIO;
if ((proc_stat_flags (file->ps) & file->desc->needs) != file->desc->needs)
return EIO;
*contents = file->desc->get_contents (file->ps, contents_len);
if (! *contents)
return ENOMEM;
return 0;
}
static struct node *
process_file_make_node (void *dir_hook, void *entry_hook)
{
static const struct procfs_node_ops ops = {
.get_contents = process_file_get_contents,
.cleanup_contents = procfs_cleanup_contents_with_free,
.cleanup = free,
};
static const struct procfs_node_ops ops_no_cleanup = {
.get_contents = process_file_get_contents,
.cleanup = free,
};
struct process_file_node *f;
f = malloc (sizeof *f);
if (! f)
return NULL;
f->desc = entry_hook;
f->ps = dir_hook;
return procfs_make_node (f->desc->no_cleanup ? &ops_no_cleanup : &ops, f);
}
static struct procfs_dir_entry entries[] = {
{
.name = "cmdline",
.make_node = process_file_make_node,
.hook = & (struct process_file_desc) {
.get_contents = process_file_gc_cmdline,
.needs = PSTAT_ARGS,
.no_cleanup = 1,
},
},
{
.name = "environ",
.make_node = process_file_make_node,
.hook = & (struct process_file_desc) {
.get_contents = process_file_gc_environ,
.needs = PSTAT_ENV,
.no_cleanup = 1,
},
},
{
.name = "stat",
.make_node = process_file_make_node,
.hook = & (struct process_file_desc) {
.get_contents = process_file_gc_stat,
.needs = PSTAT_PID | PSTAT_ARGS | PSTAT_STATE | PSTAT_PROC_INFO
| PSTAT_TASK | PSTAT_TASK_BASIC | PSTAT_THREAD_BASIC
| PSTAT_THREAD_WAIT,
},
},
{}
};
error_t
process_lookup_pid (struct ps_context *pc, pid_t pid, struct node **np)
{
struct proc_stat *ps;
error_t err;
err = _proc_stat_create (pid, pc, &ps);
if (err == ESRCH)
return ENOENT;
if (err)
return EIO;
err = proc_stat_set_flags (ps, PSTAT_OWNER_UID);
if (err || ! (proc_stat_flags (ps) & PSTAT_OWNER_UID))
return EIO;
*np = procfs_dir_make_node (entries, ps, (void (*)(void *)) _proc_stat_free);
if (! *np)
return ENOMEM;
(*np)->nn_stat.st_uid = proc_stat_owner_uid (ps);
return 0;
}
|
