Contents of /tags/mkinitrd-6_3_5/busybox/procps/smemcap.c
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Sat Jan 29 14:06:54 2011 UTC (13 years, 8 months ago) by niro
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Sat Jan 29 14:06:54 2011 UTC (13 years, 8 months ago) by niro
File MIME type: text/plain
File size: 3435 byte(s)
tagged 'mkinitrd-6_3_5'
1 | /* |
2 | smemcap - a tool for meaningful memory reporting |
3 | |
4 | Copyright 2008-2009 Matt Mackall <mpm@selenic.com> |
5 | |
6 | This software may be used and distributed according to the terms of |
7 | the GNU General Public License version 2 or later, incorporated |
8 | herein by reference. |
9 | */ |
10 | |
11 | //applet:IF_SMEMCAP(APPLET(smemcap, _BB_DIR_USR_BIN, _BB_SUID_DROP)) |
12 | |
13 | //kbuild:lib-$(CONFIG_SMEMCAP) += smemcap.o |
14 | |
15 | //config:config SMEMCAP |
16 | //config: bool "smemcap" |
17 | //config: default y |
18 | //config: help |
19 | //config: smemcap is a tool for capturing process data for smem, |
20 | //config: a memory usage statistic tool. |
21 | |
22 | #include "libbb.h" |
23 | #include "unarchive.h" |
24 | |
25 | struct fileblock { |
26 | struct fileblock *next; |
27 | char data[TAR_BLOCK_SIZE]; |
28 | }; |
29 | |
30 | static void writeheader(const char *path, struct stat *sb, int type) |
31 | { |
32 | struct tar_header_t header; |
33 | int i, sum; |
34 | |
35 | memset(&header, 0, TAR_BLOCK_SIZE); |
36 | strcpy(header.name, path); |
37 | sprintf(header.mode, "%o", sb->st_mode & 0777); |
38 | /* careful to not overflow fields! */ |
39 | sprintf(header.uid, "%o", sb->st_uid & 07777777); |
40 | sprintf(header.gid, "%o", sb->st_gid & 07777777); |
41 | sprintf(header.size, "%o", (unsigned)sb->st_size); |
42 | sprintf(header.mtime, "%llo", sb->st_mtime & 077777777777LL); |
43 | header.typeflag = type; |
44 | //strcpy(header.magic, "ustar "); - do we want to be standard-compliant? |
45 | |
46 | /* Calculate and store the checksum (the sum of all of the bytes of |
47 | * the header). The checksum field must be filled with blanks for the |
48 | * calculation. The checksum field is formatted differently from the |
49 | * other fields: it has 6 digits, a NUL, then a space -- rather than |
50 | * digits, followed by a NUL like the other fields... */ |
51 | header.chksum[7] = ' '; |
52 | sum = ' ' * 7; |
53 | for (i = 0; i < TAR_BLOCK_SIZE; i++) |
54 | sum += ((unsigned char*)&header)[i]; |
55 | sprintf(header.chksum, "%06o", sum); |
56 | |
57 | xwrite(STDOUT_FILENO, &header, TAR_BLOCK_SIZE); |
58 | } |
59 | |
60 | static void archivefile(const char *path) |
61 | { |
62 | struct fileblock *start, *cur; |
63 | struct fileblock **prev = &start; |
64 | int fd, r; |
65 | unsigned size = 0; |
66 | struct stat s; |
67 | |
68 | /* buffer the file */ |
69 | fd = xopen(path, O_RDONLY); |
70 | do { |
71 | cur = xzalloc(sizeof(*cur)); |
72 | *prev = cur; |
73 | prev = &cur->next; |
74 | r = full_read(fd, cur->data, TAR_BLOCK_SIZE); |
75 | if (r > 0) |
76 | size += r; |
77 | } while (r == TAR_BLOCK_SIZE); |
78 | |
79 | /* write archive header */ |
80 | fstat(fd, &s); |
81 | close(fd); |
82 | s.st_size = size; |
83 | writeheader(path, &s, '0'); |
84 | |
85 | /* dump file contents */ |
86 | for (cur = start; (int)size > 0; size -= TAR_BLOCK_SIZE) { |
87 | xwrite(STDOUT_FILENO, cur->data, TAR_BLOCK_SIZE); |
88 | start = cur; |
89 | cur = cur->next; |
90 | free(start); |
91 | } |
92 | } |
93 | |
94 | static void archivejoin(const char *sub, const char *name) |
95 | { |
96 | char path[sizeof(long long)*3 + sizeof("/cmdline")]; |
97 | sprintf(path, "%s/%s", sub, name); |
98 | archivefile(path); |
99 | } |
100 | |
101 | //usage:#define smemcap_trivial_usage ">SMEMDATA.TAR" |
102 | //usage:#define smemcap_full_usage "\n\n" |
103 | //usage: "Collect memory usage data in /proc and write it to stdout" |
104 | |
105 | int smemcap_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
106 | int smemcap_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
107 | { |
108 | DIR *d; |
109 | struct dirent *de; |
110 | |
111 | xchdir("/proc"); |
112 | d = xopendir("."); |
113 | |
114 | archivefile("meminfo"); |
115 | archivefile("version"); |
116 | while ((de = readdir(d)) != NULL) { |
117 | if (isdigit(de->d_name[0])) { |
118 | struct stat s; |
119 | memset(&s, 0, sizeof(s)); |
120 | s.st_mode = 0555; |
121 | writeheader(de->d_name, &s, '5'); |
122 | archivejoin(de->d_name, "smaps"); |
123 | archivejoin(de->d_name, "cmdline"); |
124 | archivejoin(de->d_name, "stat"); |
125 | } |
126 | } |
127 | |
128 | return EXIT_SUCCESS; |
129 | } |