/* 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 (2.5 kb)" //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 "bb_archive.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 "); /* like GNU tar */ /* 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"); } } if (ENABLE_FEATURE_CLEAN_UP) closedir(d); return EXIT_SUCCESS; }