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annotate utils.c @ 7:8339ab15527d

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Add running/stopped containers global statistics and refactor some things
author Louis Opter <louis@dotcloud.com>
date Sat, 01 Jan 2011 17:46:40 +0100
parents 50215911acb3
children 3a1977ecccc7
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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 <ctype.h>
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7 #include <err.h>
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8 #include <errno.h>
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9 #include <fcntl.h>
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10 #include <dirent.h>
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11 #include <stdlib.h>
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12 #include <string.h>
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13 #include <unistd.h>
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14
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15 #include "_lxcstats.h"
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16
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17 char *
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18 _lxcst_join_path(char *dest, size_t size, const char *left, const char *right)
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19 {
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20 if (*right != '/') {
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21 _lxcst_strlcpy(dest, left, size);
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22 _lxcst_strlcat(dest, "/", size);
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23 _lxcst_strlcat(dest, right, size);
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24 } else {
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25 _lxcst_strlcpy(dest, right, size);
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26 }
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27
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28 return (dest);
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29 }
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30
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31 int
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32 _lxcst_isdir(const char *path)
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33 {
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34 struct stat sb;
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35
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36 if (stat(path, &sb) == -1) {
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37 warn("can't stat path: %s", path);
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38 return (0);
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39 }
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40
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41 return (sb.st_mode & S_IFDIR);
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42 }
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43
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44 /*
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45 * Files under cgroups are virtual and always have a size of zero so we have to
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46 * do some reallocs.
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47 */
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48 ssize_t
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49 _lxcst_read_file(const char *path, char **content)
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50 {
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51 char buf[1024];
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52 int fd;
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53 ssize_t ret;
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54 ssize_t size;
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55 char *p;
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56 int sverrno;
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57
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58 assert(path);
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59 assert(content);
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60
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61 *content = NULL;
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62 size = 0;
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63
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64 fd = open(path, O_RDONLY);
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65 if (fd != -1) {
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66
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67 while (1) {
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68 ret = read(fd, buf, sizeof(buf));
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69 if (ret == -1) {
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70 if (errno == EINTR)
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71 continue ;
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72 break ;
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73 }
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74 if (ret == 0)
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75 break ;
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76
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77 p = realloc(*content, size + ret);
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78 if (!p)
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79 break ;
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80
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81 *content = p;
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82 memcpy(&content[0][size], buf, ret);
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83 size += ret;
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84 }
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85
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86 if (*content) {
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87 close(fd);
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88 return (size);
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89 }
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90
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91 sverrno = errno;
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92 close(fd);
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93 errno = sverrno;
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94 }
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95
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96 free(*content);
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97 return (ret);
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98 }
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99
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100 int
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101 _lxcst_strsplit(char *str, char **fields, size_t nfields)
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102 {
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103 char prev;
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104 int i;
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105
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106 prev = ' ';
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107 i = 0;
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108 while (*str && nfields) {
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109 if (!isspace(*str)) {
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110 if (isspace(prev)) { /* new word */
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111 fields[i] = str;
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112 ++i;
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113 --nfields;
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114 }
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115 prev = *str;
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116 } else {
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117 prev = *str;
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118 *str = '\0';
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119 }
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120 str++;
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121 }
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122
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123 return (i);
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124 }