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132 lines
3.4 KiB
C
132 lines
3.4 KiB
C
/*
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smemcap - a tool for meaningful memory reporting
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Copyright 2008-2009 Matt Mackall <mpm@selenic.com>
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This software may be used and distributed according to the terms of
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the GNU General Public License version 2 or later, incorporated
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herein by reference.
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*/
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//config:config SMEMCAP
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//config: bool "smemcap (2.5 kb)"
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//config: default y
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//config: help
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//config: smemcap is a tool for capturing process data for smem,
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//config: a memory usage statistic tool.
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//applet:IF_SMEMCAP(APPLET(smemcap, BB_DIR_USR_BIN, BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_SMEMCAP) += smemcap.o
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#include "libbb.h"
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#include "bb_archive.h"
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struct fileblock {
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struct fileblock *next;
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char data[TAR_BLOCK_SIZE];
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};
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static void writeheader(const char *path, struct stat *sb, int type)
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{
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struct tar_header_t header;
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int i, sum;
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memset(&header, 0, TAR_BLOCK_SIZE);
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strcpy(header.name, path);
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sprintf(header.mode, "%o", sb->st_mode & 0777);
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/* careful to not overflow fields! */
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sprintf(header.uid, "%o", sb->st_uid & 07777777);
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sprintf(header.gid, "%o", sb->st_gid & 07777777);
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sprintf(header.size, "%o", (unsigned)sb->st_size);
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sprintf(header.mtime, "%llo", sb->st_mtime & 077777777777LL);
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header.typeflag = type;
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strcpy(header.magic, "ustar "); /* like GNU tar */
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/* Calculate and store the checksum (the sum of all of the bytes of
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* the header). The checksum field must be filled with blanks for the
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* calculation. The checksum field is formatted differently from the
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* other fields: it has 6 digits, a NUL, then a space -- rather than
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* digits, followed by a NUL like the other fields... */
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header.chksum[7] = ' ';
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sum = ' ' * 7;
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for (i = 0; i < TAR_BLOCK_SIZE; i++)
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sum += ((unsigned char*)&header)[i];
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sprintf(header.chksum, "%06o", sum);
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xwrite(STDOUT_FILENO, &header, TAR_BLOCK_SIZE);
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}
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static void archivefile(const char *path)
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{
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struct fileblock *start, *cur;
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struct fileblock **prev = &start;
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int fd, r;
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unsigned size = 0;
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struct stat s;
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/* buffer the file */
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fd = xopen(path, O_RDONLY);
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do {
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cur = xzalloc(sizeof(*cur));
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*prev = cur;
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prev = &cur->next;
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r = full_read(fd, cur->data, TAR_BLOCK_SIZE);
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if (r > 0)
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size += r;
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} while (r == TAR_BLOCK_SIZE);
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/* write archive header */
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fstat(fd, &s);
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close(fd);
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s.st_size = size;
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writeheader(path, &s, '0');
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/* dump file contents */
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for (cur = start; (int)size > 0; size -= TAR_BLOCK_SIZE) {
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xwrite(STDOUT_FILENO, cur->data, TAR_BLOCK_SIZE);
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start = cur;
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cur = cur->next;
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free(start);
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}
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}
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static void archivejoin(const char *sub, const char *name)
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{
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char path[sizeof(long long)*3 + sizeof("/cmdline")];
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sprintf(path, "%s/%s", sub, name);
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archivefile(path);
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}
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//usage:#define smemcap_trivial_usage ">SMEMDATA.TAR"
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//usage:#define smemcap_full_usage "\n\n"
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//usage: "Collect memory usage data in /proc and write it to stdout"
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int smemcap_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int smemcap_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
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{
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DIR *d;
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struct dirent *de;
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xchdir("/proc");
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d = xopendir(".");
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archivefile("meminfo");
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archivefile("version");
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while ((de = readdir(d)) != NULL) {
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if (isdigit(de->d_name[0])) {
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struct stat s;
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memset(&s, 0, sizeof(s));
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s.st_mode = 0555;
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writeheader(de->d_name, &s, '5');
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archivejoin(de->d_name, "smaps");
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archivejoin(de->d_name, "cmdline");
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archivejoin(de->d_name, "stat");
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}
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}
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if (ENABLE_FEATURE_CLEAN_UP)
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closedir(d);
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return EXIT_SUCCESS;
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}
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