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
|
/*
* pmap implementation for busybox
*
* Copyright (C) 2010 Nokia Corporation. All rights reserved.
* Written by Alexander Shishkin <virtuoso@slind.org>
*
* Licensed under GPLv2 or later, see the LICENSE file in this source tree
* for details.
*/
//config:config PMAP
//config: bool "pmap (6.2 kb)"
//config: default y
//config: help
//config: Display processes' memory mappings.
//applet:IF_PMAP(APPLET(pmap, BB_DIR_USR_BIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_PMAP) += pmap.o
//usage:#define pmap_trivial_usage
//usage: "[-xq] PID..."
//usage:#define pmap_full_usage "\n\n"
//usage: "Display process memory usage"
//usage: "\n"
//usage: "\n -x Show details"
//usage: "\n -q Quiet"
#include "libbb.h"
#if ULLONG_MAX == 0xffffffff
# define TABS "\t"
# define SIZEWIDTHx "7"
# define SIZEWIDTH "9"
# define AFMTLL "8"
# define DASHES ""
#else
# define TABS "\t\t"
# define SIZEWIDTHx "15"
# define SIZEWIDTH "17"
# define AFMTLL "16"
# define DASHES "--------"
#endif
enum {
OPT_x = 1 << 0,
OPT_q = 1 << 1,
};
struct smaprec {
// For mixed 32/64 userspace, 32-bit pmap still needs
// 64-bit field here to correctly show 64-bit processes:
unsigned long long smap_start;
// Make size wider too:
// I've seen 1203765248 kb large "---p" mapping in a browser,
// this cuts close to 4 terabytes.
unsigned long long smap_size;
// (strictly speaking, other fields need to be wider too,
// but they are in kbytes, not bytes, and they hold sizes,
// not start addresses, sizes tend to be less than 4 terabytes)
unsigned long private_dirty;
unsigned long smap_pss, smap_swap;
char smap_mode[5];
char *smap_name;
};
// How long the filenames and command lines we want to handle?
#define PMAP_BUFSZ 4096
static void print_smaprec(struct smaprec *currec)
{
printf("%0" AFMTLL "llx ", currec->smap_start);
if (option_mask32 & OPT_x)
printf("%7llu %7lu %7lu %7lu ",
currec->smap_size,
currec->smap_pss,
currec->private_dirty,
currec->smap_swap);
else
printf("%7lluK", currec->smap_size);
printf(" %.4s %s\n", currec->smap_mode, currec->smap_name ? : " [ anon ]");
}
/* libbb's procps_read_smaps() looks somewhat similar,
* but the collected information is sufficiently different
* that merging them into one function is not a good idea
* (unless you feel masochistic today).
*/
static int read_smaps(pid_t pid, char buf[PMAP_BUFSZ], struct smaprec *total)
{
FILE *file;
struct smaprec currec;
char filename[sizeof("/proc/%u/smaps") + sizeof(int)*3];
sprintf(filename, "/proc/%u/smaps", (int)pid);
file = fopen_for_read(filename);
if (!file)
return 1;
memset(&currec, 0, sizeof(currec));
while (fgets(buf, PMAP_BUFSZ, file)) {
// Each mapping datum has this form:
// f7d29000-f7d39000 rw-s FILEOFS M:m INODE FILENAME
// Size: nnn kB
// Rss: nnn kB
// .....
char *tp, *p;
#define bytes4 *(uint32_t*)buf
#define Pss_ PACK32_BYTES('P','s','s',':')
#define Swap PACK32_BYTES('S','w','a','p')
#define Priv PACK32_BYTES('P','r','i','v')
#define FETCH(X, N) \
tp = skip_whitespace(buf+4 + (N)); \
total->X += currec.X = fast_strtoul_10(&tp); \
continue
#define SCAN(S, X) \
if (memcmp(buf+4, S, sizeof(S)-1) == 0) { \
FETCH(X, sizeof(S)-1); \
}
if (bytes4 == Pss_) {
FETCH(smap_pss, 0);
}
if (bytes4 == Swap && buf[4] == ':') {
FETCH(smap_swap, 1);
}
if (bytes4 == Priv) {
SCAN("ate_Dirty:", private_dirty);
}
#undef bytes4
#undef Pss_
#undef Swap
#undef Priv
#undef FETCH
#undef SCAN
tp = strchr(buf, '-');
if (tp) {
// We reached next mapping - the line of this form:
// f7d29000-f7d39000 rw-s FILEOFS M:m INODE FILENAME
// If we have a previous record, there's nothing more
// for it, print and clear currec
if (currec.smap_size)
print_smaprec(&currec);
free(currec.smap_name);
memset(&currec, 0, sizeof(currec));
*tp = ' ';
tp = buf;
currec.smap_start = fast_strtoull_16(&tp);
currec.smap_size = (fast_strtoull_16(&tp) - currec.smap_start) >> 10;
strncpy(currec.smap_mode, tp, sizeof(currec.smap_mode)-1);
// skipping "rw-s FILEOFS M:m INODE "
tp = skip_fields(tp, 4);
tp = skip_whitespace(tp); // there may be many spaces, can't just "tp++"
p = strchrnul(tp, '\n');
if (p != tp) {
currec.smap_name = xstrndup(tp, p - tp);
}
total->smap_size += currec.smap_size;
}
} // while (got line)
fclose(file);
if (currec.smap_size)
print_smaprec(&currec);
free(currec.smap_name);
return 0;
}
static int procps_get_maps(pid_t pid, unsigned opt)
{
struct smaprec total;
int ret;
char buf[PMAP_BUFSZ] ALIGN4;
ret = read_cmdline(buf, sizeof(buf), pid, NULL);
if (ret < 0)
return ret;
printf("%u: %s\n", (int)pid, buf);
if (!(opt & OPT_q) && (opt & OPT_x))
puts("Address" TABS " Kbytes PSS Dirty Swap Mode Mapping");
memset(&total, 0, sizeof(total));
ret = read_smaps(pid, buf, &total);
if (ret)
return ret;
if (!(opt & OPT_q)) {
if (opt & OPT_x)
printf("--------" DASHES " ------ ------ ------ ------\n"
"total kB %"SIZEWIDTHx"llu %7lu %7lu %7lu\n",
total.smap_size, total.smap_pss, total.private_dirty, total.smap_swap);
else
printf(" total %"SIZEWIDTH"lluK\n", total.smap_size);
}
return 0;
}
int pmap_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int pmap_main(int argc UNUSED_PARAM, char **argv)
{
unsigned opts;
int ret;
opts = getopt32(argv, "^" "xq" "\0" "-1"); /* min one arg */
argv += optind;
ret = 0;
while (*argv) {
pid_t pid = xatoi_positive(*argv++);
/* GNU pmap returns 42 if any of the pids failed */
if (procps_get_maps(pid, opts) != 0)
ret = 42;
}
return ret;
}
|
