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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
parents
children 2cb8a6cbe468
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0
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/stat.h>
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3
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4 #include <assert.h>
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5 #include <dirent.h>
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6 #include <err.h>
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7 #include <errno.h>
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8 #include <stdio.h>
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9 #include <stdlib.h>
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10 #include <string.h>
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11
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12 #include "lxcstats.h"
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13 #include "_lxcstats.h"
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14
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15 static int
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16 _lxcst_unselect_current_and_parent(const struct dirent* d)
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17 {
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18 return (strcmp(d->d_name, ".") && strcmp(d->d_name, ".."));
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19 }
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20
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21 struct lxcst *
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22 _lxcst_container_new(struct _lxcst_controller *ct, const char *name)
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23 {
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24 char buf[256];
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25 struct lxcst *c;
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26
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27 assert(ct);
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28 assert(name);
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29
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30 printf("new container %s\n", name);
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31
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32 c = calloc(1, sizeof(*c));
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33 if (!c)
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34 return (NULL);
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35
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36 _lxcst_join_path(buf, sizeof(buf), ct->cgroup_dir, name);
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37
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38 c->name = strdup(name);
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39 c->cgroup_dir = strdup(buf);
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40 if (!c->name || !c->cgroup_dir)
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41 goto free_container;
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42
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43 return (c);
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44
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45 free_container:
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46 free(c->name);
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47 free(c);
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48 return (NULL);
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49 }
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50
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51 void
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52 _lxcst_container_delete(struct lxcst *c)
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53 {
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54 if (c) {
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55 free(c->name);
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56 free(c->cgroup_dir);
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57 free(c->cpuacct.percpu);
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58 free(c);
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59 }
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60 }
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61
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62 int
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63 _lxcst_container_read_infos(struct lxcst *c)
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64 {
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65 int i;
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66
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67 assert(c);
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68
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69 for (i = 0; _lxcst_probes[i].fn; ++i)
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70 if (_lxcst_probes[i].fn((c)))
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71 warn("%s probe failed for container %s", _lxcst_probes[i].name, c->name);
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72
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73 return (0);
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74 }
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75
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76 int
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77 lxcst_span_containers(lxcst_handle *hdl, int (*cb)(void *, const struct lxcst *), void *ctx)
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78 {
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79 int n;
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80 struct dirent **c_vec;
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81 struct lxcst *c;
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82
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83 assert(hdl);
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84 assert(hdl->cgroup_dir);
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85 assert(cb);
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86
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87 n = scandir(hdl->cgroup_dir, &c_vec, &_lxcst_unselect_current_and_parent, NULL);
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88 if (n > 0) {
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89 while (n--) {
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90 if (_lxcst_isdir(hdl, c_vec[n])) {
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91 c = _lxcst_container_new(hdl, c_vec[n]->d_name);
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92 if (c && _lxcst_container_read_infos(c) == 0
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93 && cb(ctx, c)) {
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94 errno = EINTR;
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95 goto abort_by_cb;
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96 }
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97 }
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98 free(c_vec[n]);
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99 }
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100 free(c_vec);
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101 } else if (n < 0) {
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102 return (-1);
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103 }
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104
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105 return (0);
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106
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107 abort_by_cb:
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108 free(c_vec[n + 1]);
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109 while (n--)
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110 free(c_vec[n]);
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111 free(c_vec);
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112 return (-1);
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113 }