Wed, 13 Aug 2014 21:21:55 +0200
Added loggin when a device is switched on or off in beer/fridge/profile mode.
103
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1 | /***************************************************************************** |
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2 | * Copyright (C) 2014 |
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3 | * |
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4 | * Michiel Broek <mbroek at mbse dot eu> |
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5 | * |
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6 | * This file is part of the mbsePi-apps |
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7 | * |
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8 | * This is free software; you can redistribute it and/or modify it |
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9 | * under the terms of the GNU General Public License as published by the |
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10 | * Free Software Foundation; either version 2, or (at your option) any |
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11 | * later version. |
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12 | * |
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13 | * mbsePi-apps is distributed in the hope that it will be useful, but |
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14 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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16 | * General Public License for more details. |
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17 | * |
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18 | * You should have received a copy of the GNU General Public License |
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19 | * along with EC-65K; see the file COPYING. If not, write to the Free |
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20 | * Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
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21 | *****************************************************************************/ |
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22 | |
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23 | #include "mash.h" |
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24 | #include "lock.h" |
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25 | |
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26 | |
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27 | /* |
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28 | * Put a lock on this program. |
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29 | */ |
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30 | int lockprog(char *name) |
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31 | { |
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32 | char *tempfile, *lockfile; |
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33 | FILE *fp; |
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34 | pid_t oldpid; |
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35 | |
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36 | tempfile = calloc(PATH_MAX, sizeof(char)); |
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37 | lockfile = calloc(PATH_MAX, sizeof(char)); |
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38 | |
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39 | snprintf(tempfile, PATH_MAX, "/var/run/%s.tmp", name); |
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40 | snprintf(lockfile, PATH_MAX, "/var/run/%s.pid", name); |
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41 | |
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42 | if ((fp = fopen(tempfile, "w")) == NULL) { |
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43 | perror(name); |
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44 | printf("Can't create lockfile \"%s\"\n", tempfile); |
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45 | free(tempfile); |
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46 | free(lockfile); |
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47 | return 1; |
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48 | } |
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49 | fprintf(fp, "%10u\n", getpid()); |
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50 | fclose(fp); |
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51 | |
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52 | while (TRUE) { |
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53 | if (link(tempfile, lockfile) == 0) { |
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54 | unlink(tempfile); |
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55 | free(tempfile); |
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56 | free(lockfile); |
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57 | return 0; |
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58 | } |
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59 | if ((fp = fopen(lockfile, "r")) == NULL) { |
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60 | perror(name); |
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61 | printf("Can't open lockfile \"%s\"\n", tempfile); |
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62 | unlink(tempfile); |
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63 | free(tempfile); |
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64 | free(lockfile); |
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65 | return 1; |
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66 | } |
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67 | if (fscanf(fp, "%u", &oldpid) != 1) { |
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68 | perror(name); |
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69 | printf("Can't read old pid from \"%s\"\n", tempfile); |
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70 | fclose(fp); |
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71 | unlink(tempfile); |
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72 | free(tempfile); |
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73 | free(lockfile); |
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74 | return 1; |
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75 | } |
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76 | fclose(fp); |
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77 | if (kill(oldpid,0) == -1) { |
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78 | if (errno == ESRCH) { |
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79 | printf("Stale lock found for pid %u\n", oldpid); |
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80 | unlink(lockfile); |
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81 | /* no return, try lock again */ |
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82 | } else { |
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83 | perror(name); |
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84 | printf("Kill for %u failed\n",oldpid); |
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85 | unlink(tempfile); |
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86 | free(tempfile); |
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87 | free(lockfile); |
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88 | return 1; |
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89 | } |
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90 | } else { |
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91 | printf("Another %s is already running, pid=%u\n", name, oldpid); |
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92 | unlink(tempfile); |
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93 | free(tempfile); |
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94 | free(lockfile); |
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95 | return 1; |
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96 | } |
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97 | } |
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98 | } |
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99 | |
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100 | |
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101 | |
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102 | void ulockprog(char *name) |
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103 | { |
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104 | char *lockfile; |
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105 | pid_t oldpid; |
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106 | FILE *fp; |
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107 | |
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108 | lockfile = calloc(PATH_MAX, sizeof(char)); |
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109 | snprintf(lockfile, PATH_MAX, "/var/run/%s.pid", name); |
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110 | |
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111 | if ((fp = fopen(lockfile, "r")) == NULL) { |
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112 | syslog(LOG_NOTICE, "Can't open lockfile \"%s\"", lockfile); |
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113 | free(lockfile); |
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114 | return; |
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115 | } |
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116 | |
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117 | if (fscanf(fp, "%u", &oldpid) != 1) { |
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118 | syslog(LOG_NOTICE, "Can't read old pid from \"%s\"", lockfile); |
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119 | fclose(fp); |
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120 | unlink(lockfile); |
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121 | free(lockfile); |
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122 | return; |
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123 | } |
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Michiel Broek <mbroek@mbse.eu>
parents:
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124 | |
99c47a8a61cb
Added the mash sourcecode, this does nothing useful yet.
Michiel Broek <mbroek@mbse.eu>
parents:
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125 | fclose(fp); |
99c47a8a61cb
Added the mash sourcecode, this does nothing useful yet.
Michiel Broek <mbroek@mbse.eu>
parents:
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126 | |
99c47a8a61cb
Added the mash sourcecode, this does nothing useful yet.
Michiel Broek <mbroek@mbse.eu>
parents:
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127 | if (oldpid == getpid()) { |
99c47a8a61cb
Added the mash sourcecode, this does nothing useful yet.
Michiel Broek <mbroek@mbse.eu>
parents:
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128 | (void)unlink(lockfile); |
99c47a8a61cb
Added the mash sourcecode, this does nothing useful yet.
Michiel Broek <mbroek@mbse.eu>
parents:
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129 | } |
99c47a8a61cb
Added the mash sourcecode, this does nothing useful yet.
Michiel Broek <mbroek@mbse.eu>
parents:
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130 | |
99c47a8a61cb
Added the mash sourcecode, this does nothing useful yet.
Michiel Broek <mbroek@mbse.eu>
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131 | free(lockfile); |
99c47a8a61cb
Added the mash sourcecode, this does nothing useful yet.
Michiel Broek <mbroek@mbse.eu>
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132 | } |
99c47a8a61cb
Added the mash sourcecode, this does nothing useful yet.
Michiel Broek <mbroek@mbse.eu>
parents:
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133 | |
99c47a8a61cb
Added the mash sourcecode, this does nothing useful yet.
Michiel Broek <mbroek@mbse.eu>
parents:
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134 |