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annotate container.c @ 3:2cb8a6cbe468

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cpuacct: convert per cpu usage from nanoseconds to jiffies
author Louis Opter <louis@dotcloud.com>
date Fri, 31 Dec 2010 20:04:25 +0100
parents 6ce4443e7545
children 8339ab15527d
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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 <stdlib.h>
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9 #include <string.h>
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10
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11 #include "lxcstats.h"
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12 #include "_lxcstats.h"
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13
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14 static int
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15 _lxcst_unselect_current_and_parent(const struct dirent* d)
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16 {
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17 return (strcmp(d->d_name, ".") && strcmp(d->d_name, ".."));
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18 }
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19
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20 struct lxcst *
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21 _lxcst_container_new(struct _lxcst_controller *ct, const char *name)
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22 {
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23 char buf[256];
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24 struct lxcst *c;
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25
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26 assert(ct);
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27 assert(name);
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28
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29 c = calloc(1, sizeof(*c));
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30 if (!c)
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31 return (NULL);
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32
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33 _lxcst_join_path(buf, sizeof(buf), ct->cgroup_dir, name);
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34
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35 c->name = strdup(name);
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36 c->cgroup_dir = strdup(buf);
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37 if (!c->name || !c->cgroup_dir)
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38 goto free_container;
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39
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40 return (c);
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41
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42 free_container:
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43 free(c->name);
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44 free(c);
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45 return (NULL);
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46 }
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47
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48 void
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49 _lxcst_container_delete(struct lxcst *c)
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50 {
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51 if (c) {
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52 free(c->name);
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53 free(c->cgroup_dir);
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54 free(c->cpuacct.percpu);
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55 free(c);
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56 }
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57 }
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58
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59 int
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60 _lxcst_container_read_infos(struct lxcst *c)
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61 {
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62 int i;
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63
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64 assert(c);
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65
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66 for (i = 0; _lxcst_probes[i].fn; ++i)
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67 if (_lxcst_probes[i].fn((c)))
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68 warn("%s probe failed for container %s", _lxcst_probes[i].name, c->name);
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69
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70 return (0);
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71 }
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72
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73 int
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74 lxcst_span_containers(lxcst_handle *hdl, int (*cb)(void *, const struct lxcst *), void *ctx)
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75 {
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76 int n;
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77 struct dirent **c_vec;
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78 struct lxcst *c;
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79
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80 assert(hdl);
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81 assert(hdl->cgroup_dir);
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82 assert(cb);
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83
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84 n = scandir(hdl->cgroup_dir, &c_vec, &_lxcst_unselect_current_and_parent, NULL);
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85 if (n > 0) {
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86 while (n--) {
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87 if (_lxcst_isdir(hdl, c_vec[n])) {
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88 c = _lxcst_container_new(hdl, c_vec[n]->d_name);
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89 if (c && _lxcst_container_read_infos(c) == 0
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90 && cb(ctx, c)) {
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91 errno = EINTR;
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92 goto abort_by_cb;
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93 }
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94 }
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95 free(c_vec[n]);
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96 }
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97 free(c_vec);
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98 } else if (n < 0) {
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99 return (-1);
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100 }
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101
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102 return (0);
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103
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104 abort_by_cb:
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105 free(c_vec[n + 1]);
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106 while (n--)
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107 free(c_vec[n]);
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108 free(c_vec);
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109 return (-1);
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110 }