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Add the draft of an API to collect statistics on LXC
author Louis Opter <kalessin@kalessin.fr>
date Wed, 29 Dec 2010 23:28:14 +0100
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children 50215911acb3
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6ce4443e7545 Add the draft of an API to collect statistics on LXC
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1 #include <sys/types.h>
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2 #include <sys/mman.h>
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3 #include <sys/stat.h>
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4
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5 #include <assert.h>
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6 #include <err.h>
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7 #include <errno.h>
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8 #include <fcntl.h>
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9 #include <dirent.h>
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10 #include <stdlib.h>
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11 #include <string.h>
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12 #include <unistd.h>
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13
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14 #include "_lxcstats.h"
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15
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16 char *
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17 _lxcst_join_path(char *dest, size_t size, const char *left, const char *right)
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18 {
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19 if (*right != '/') {
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20 _lxcst_strlcpy(dest, left, size);
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21 _lxcst_strlcat(dest, "/", size);
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22 _lxcst_strlcat(dest, right, size);
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23 } else {
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24 _lxcst_strlcpy(dest, right, size);
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25 }
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26
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27 return (dest);
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28 }
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29
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30 int
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31 _lxcst_isdir(const struct _lxcst_controller *hdl, const struct dirent *d)
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32 {
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33 struct stat sb;
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34 char buf[PATH_MAX];
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35
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36 _lxcst_join_path(buf, sizeof(buf), hdl->cgroup_dir, d->d_name);
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37
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38 if (stat(buf, &sb) == -1) {
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39 warn("can't stat file: %s", buf);
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40 return (0);
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41 }
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42
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43 return (sb.st_mode & S_IFDIR);
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44 }
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45
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46 /*
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47 * Files under cgroups are virtual and always have a size of zero so we have to
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48 * do some reallocs.
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49 */
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50 ssize_t
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51 _lxcst_read_file(const char *path, char **content)
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52 {
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53 char buf[1024];
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54 int fd;
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55 ssize_t ret;
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56 ssize_t size;
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57 char *p;
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58 int sverrno;
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59
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60 assert(path);
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61 assert(content);
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62
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63 *content = NULL;
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64 size = 0;
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65
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66 fd = open(path, O_RDONLY);
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67 if (fd != -1) {
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68
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69 while (1) {
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70 ret = read(fd, buf, sizeof(buf));
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71 if (ret == -1) {
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72 if (errno == EINTR)
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73 continue ;
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74 break ;
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75 }
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76 if (ret == 0)
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77 break ;
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78
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79 p = realloc(*content, size + ret);
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80 if (!p)
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81 break ;
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82
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83 *content = p;
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84 memcpy(&content[0][size], buf, ret);
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85 size += ret;
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86 }
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87
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88 if (*content) {
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89 close(fd);
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90 return (size);
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91 }
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92
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93 sverrno = errno;
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94 close(fd);
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95 errno = sverrno;
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96 }
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97
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98 free(*content);
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99 return (ret);
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100 }