[5] | 1 | #include <errno.h> |
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| 2 | #include <dirent.h> |
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| 3 | #include <stdio.h> |
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| 4 | #include <stdlib.h> |
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| 5 | #include <sys/types.h> |
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| 6 | #include <sys/stat.h> |
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| 7 | #include <unistd.h> |
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| 8 | #include <limits.h> |
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| 9 | |
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| 10 | #include <iostream> |
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| 11 | |
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| 12 | int remove_links(const std::string path, const std::string dirl, int timer) |
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| 13 | { |
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| 14 | // removes hard links in directory "dirl" to file "path" |
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| 15 | // in directory "dir", if they are older than "time" seconds. |
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| 16 | // Method: |
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| 17 | // using readdir, examine all components of dirl and see |
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| 18 | // if they have the same inode as "path". If so, remove, unless |
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| 19 | // the realname is the same as the realname of "path" |
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| 20 | // |
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| 21 | DIR *pdir; |
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| 22 | struct dirent *pent; |
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| 23 | int rc; |
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| 24 | struct stat buf; |
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| 25 | |
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| 26 | pdir = opendir(dirl.c_str()); |
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| 27 | if (!pdir) |
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| 28 | { |
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| 29 | std::cerr << "Cannot read link directory '"<<dirl<<"'"<<std::endl; |
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| 30 | return 1; |
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| 31 | } |
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| 32 | rc = stat(path.c_str(),&buf); |
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| 33 | if (rc !=0) |
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| 34 | { |
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| 35 | std::cerr << "Cannot stat '"<<path<<"'"<<std::endl; |
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| 36 | return 1; |
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| 37 | } |
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| 38 | ino_t inodenr = buf.st_ino; |
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| 39 | char rpathc[PATH_MAX+1]; |
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| 40 | realpath(path.c_str(),rpathc); |
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| 41 | std::string rpath = rpathc; |
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| 42 | std::cerr<<"TD: basefile '"<<rpath<<"'"<<std::endl; |
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| 43 | std::string rpath1; |
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| 44 | |
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| 45 | while ((pent=readdir(pdir))) |
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| 46 | { |
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| 47 | struct stat buf; |
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| 48 | std::string name = pent->d_name; |
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| 49 | if (name == ".") continue; |
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| 50 | if (name == "..") continue; |
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| 51 | realpath((dirl+"/"+name).c_str(),rpathc); |
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| 52 | rpath1 = rpathc; |
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| 53 | std::cerr<<"TD: looking at '"<<rpath1<<"'"<<std::endl; |
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| 54 | if (rpath != rpath1) |
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| 55 | { |
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| 56 | int rc = stat(rpath1.c_str(),&buf); |
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| 57 | if (rc != 0) |
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| 58 | { |
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| 59 | std::cerr<<"Cannot stat '"<<rpath1<<"'"<<" this cannot happen!" << std::endl; |
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| 60 | return 1; |
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| 61 | } |
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| 62 | if (buf.st_ino == inodenr) |
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| 63 | { |
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| 64 | std::cerr << "time: " << time(0) << " " << buf.st_mtime << " " << timer << std::endl; |
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| 65 | if (time(0) > buf.st_mtime + timer) |
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| 66 | { |
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| 67 | int rc = unlink(rpath1.c_str()); |
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| 68 | if (rc == 0) |
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| 69 | std::cerr<<"Unlinked '"<<rpath1<<"'"<<std::endl; |
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| 70 | else |
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| 71 | std::cerr<<"Could not unlink '"<<rpath1<<"'"<<std::endl; |
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| 72 | } |
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| 73 | else |
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| 74 | std::cerr << "TD: not unlinking because time: '"<<rpath1<<"'"<<std::endl; |
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| 75 | } |
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| 76 | } |
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| 77 | else |
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| 78 | std::cerr<<"TD: not unlinking '"<<rpath1<<"'"<<std::endl; |
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| 79 | } |
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| 80 | return 0; |
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| 81 | } |
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| 82 | int main() |
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| 83 | { |
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| 84 | std::string poolfilename="pool"; |
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| 85 | std::string linkdirname="linkdir"; |
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| 86 | int timer = 60; |
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| 87 | remove_links(poolfilename, linkdirname,timer); |
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| 88 | return 0; |
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| 89 | } |
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