Denys Vlasenko | a091d45 | 2010-06-24 05:05:12 +0200 | [diff] [blame] | 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" |
Denys Vlasenko | 52827e3 | 2010-06-26 18:21:36 +0200 | [diff] [blame] | 23 | #include "unarchive.h" |
Denys Vlasenko | a091d45 | 2010-06-24 05:05:12 +0200 | [diff] [blame] | 24 | |
| 25 | struct fileblock { |
| 26 | struct fileblock *next; |
Denys Vlasenko | 52827e3 | 2010-06-26 18:21:36 +0200 | [diff] [blame] | 27 | char data[TAR_BLOCK_SIZE]; |
Denys Vlasenko | a091d45 | 2010-06-24 05:05:12 +0200 | [diff] [blame] | 28 | }; |
| 29 | |
| 30 | static void writeheader(const char *path, struct stat *sb, int type) |
| 31 | { |
Denys Vlasenko | 52827e3 | 2010-06-26 18:21:36 +0200 | [diff] [blame] | 32 | struct tar_header_t header; |
Denys Vlasenko | a091d45 | 2010-06-24 05:05:12 +0200 | [diff] [blame] | 33 | int i, sum; |
| 34 | |
Denys Vlasenko | 52827e3 | 2010-06-26 18:21:36 +0200 | [diff] [blame] | 35 | memset(&header, 0, TAR_BLOCK_SIZE); |
Denys Vlasenko | a091d45 | 2010-06-24 05:05:12 +0200 | [diff] [blame] | 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; |
Denys Vlasenko | 5a0d899 | 2010-09-12 17:13:29 +0200 | [diff] [blame] | 44 | strcpy(header.magic, "ustar "); /* like GNU tar */ |
Denys Vlasenko | a091d45 | 2010-06-24 05:05:12 +0200 | [diff] [blame] | 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; |
Denys Vlasenko | 52827e3 | 2010-06-26 18:21:36 +0200 | [diff] [blame] | 53 | for (i = 0; i < TAR_BLOCK_SIZE; i++) |
Denys Vlasenko | a091d45 | 2010-06-24 05:05:12 +0200 | [diff] [blame] | 54 | sum += ((unsigned char*)&header)[i]; |
| 55 | sprintf(header.chksum, "%06o", sum); |
| 56 | |
Denys Vlasenko | 52827e3 | 2010-06-26 18:21:36 +0200 | [diff] [blame] | 57 | xwrite(STDOUT_FILENO, &header, TAR_BLOCK_SIZE); |
Denys Vlasenko | a091d45 | 2010-06-24 05:05:12 +0200 | [diff] [blame] | 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; |
Denys Vlasenko | 52827e3 | 2010-06-26 18:21:36 +0200 | [diff] [blame] | 74 | r = full_read(fd, cur->data, TAR_BLOCK_SIZE); |
Denys Vlasenko | a091d45 | 2010-06-24 05:05:12 +0200 | [diff] [blame] | 75 | if (r > 0) |
| 76 | size += r; |
Denys Vlasenko | 52827e3 | 2010-06-26 18:21:36 +0200 | [diff] [blame] | 77 | } while (r == TAR_BLOCK_SIZE); |
Denys Vlasenko | a091d45 | 2010-06-24 05:05:12 +0200 | [diff] [blame] | 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 */ |
Denys Vlasenko | 52827e3 | 2010-06-26 18:21:36 +0200 | [diff] [blame] | 86 | for (cur = start; (int)size > 0; size -= TAR_BLOCK_SIZE) { |
| 87 | xwrite(STDOUT_FILENO, cur->data, TAR_BLOCK_SIZE); |
Denys Vlasenko | a091d45 | 2010-06-24 05:05:12 +0200 | [diff] [blame] | 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 | } |