| /* |
| smemcap - a tool for meaningful memory reporting |
| |
| Copyright 2008-2009 Matt Mackall <mpm@selenic.com> |
| |
| This software may be used and distributed according to the terms of |
| the GNU General Public License version 2 or later, incorporated |
| herein by reference. |
| */ |
| |
| //applet:IF_SMEMCAP(APPLET(smemcap, _BB_DIR_USR_BIN, _BB_SUID_DROP)) |
| |
| //kbuild:lib-$(CONFIG_SMEMCAP) += smemcap.o |
| |
| //config:config SMEMCAP |
| //config: bool "smemcap" |
| //config: default y |
| //config: help |
| //config: smemcap is a tool for capturing process data for smem, |
| //config: a memory usage statistic tool. |
| |
| #include "libbb.h" |
| #include "unarchive.h" |
| |
| struct fileblock { |
| struct fileblock *next; |
| char data[TAR_BLOCK_SIZE]; |
| }; |
| |
| static void writeheader(const char *path, struct stat *sb, int type) |
| { |
| struct tar_header_t header; |
| int i, sum; |
| |
| memset(&header, 0, TAR_BLOCK_SIZE); |
| strcpy(header.name, path); |
| sprintf(header.mode, "%o", sb->st_mode & 0777); |
| /* careful to not overflow fields! */ |
| sprintf(header.uid, "%o", sb->st_uid & 07777777); |
| sprintf(header.gid, "%o", sb->st_gid & 07777777); |
| sprintf(header.size, "%o", (unsigned)sb->st_size); |
| sprintf(header.mtime, "%llo", sb->st_mtime & 077777777777LL); |
| header.typeflag = type; |
| //strcpy(header.magic, "ustar "); - do we want to be standard-compliant? |
| |
| /* Calculate and store the checksum (the sum of all of the bytes of |
| * the header). The checksum field must be filled with blanks for the |
| * calculation. The checksum field is formatted differently from the |
| * other fields: it has 6 digits, a NUL, then a space -- rather than |
| * digits, followed by a NUL like the other fields... */ |
| header.chksum[7] = ' '; |
| sum = ' ' * 7; |
| for (i = 0; i < TAR_BLOCK_SIZE; i++) |
| sum += ((unsigned char*)&header)[i]; |
| sprintf(header.chksum, "%06o", sum); |
| |
| xwrite(STDOUT_FILENO, &header, TAR_BLOCK_SIZE); |
| } |
| |
| static void archivefile(const char *path) |
| { |
| struct fileblock *start, *cur; |
| struct fileblock **prev = &start; |
| int fd, r; |
| unsigned size = 0; |
| struct stat s; |
| |
| /* buffer the file */ |
| fd = xopen(path, O_RDONLY); |
| do { |
| cur = xzalloc(sizeof(*cur)); |
| *prev = cur; |
| prev = &cur->next; |
| r = full_read(fd, cur->data, TAR_BLOCK_SIZE); |
| if (r > 0) |
| size += r; |
| } while (r == TAR_BLOCK_SIZE); |
| |
| /* write archive header */ |
| fstat(fd, &s); |
| close(fd); |
| s.st_size = size; |
| writeheader(path, &s, '0'); |
| |
| /* dump file contents */ |
| for (cur = start; (int)size > 0; size -= TAR_BLOCK_SIZE) { |
| xwrite(STDOUT_FILENO, cur->data, TAR_BLOCK_SIZE); |
| start = cur; |
| cur = cur->next; |
| free(start); |
| } |
| } |
| |
| static void archivejoin(const char *sub, const char *name) |
| { |
| char path[sizeof(long long)*3 + sizeof("/cmdline")]; |
| sprintf(path, "%s/%s", sub, name); |
| archivefile(path); |
| } |
| |
| //usage:#define smemcap_trivial_usage ">SMEMDATA.TAR" |
| //usage:#define smemcap_full_usage "\n\n" |
| //usage: "Collect memory usage data in /proc and write it to stdout" |
| |
| int smemcap_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int smemcap_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
| { |
| DIR *d; |
| struct dirent *de; |
| |
| xchdir("/proc"); |
| d = xopendir("."); |
| |
| archivefile("meminfo"); |
| archivefile("version"); |
| while ((de = readdir(d)) != NULL) { |
| if (isdigit(de->d_name[0])) { |
| struct stat s; |
| memset(&s, 0, sizeof(s)); |
| s.st_mode = 0555; |
| writeheader(de->d_name, &s, '5'); |
| archivejoin(de->d_name, "smaps"); |
| archivejoin(de->d_name, "cmdline"); |
| archivejoin(de->d_name, "stat"); |
| } |
| } |
| |
| return EXIT_SUCCESS; |
| } |