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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