Thu, 31 Jul 2014 17:44:50 +0200
Added device configuration
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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 | |
106 | 23 | #include "lock.h" |
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24 | #include "thermferm.h" |
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25 | |
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26 | /* |
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27 | * Put a lock on this program. |
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28 | */ |
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29 | int lockprog(char *name) |
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30 | { |
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31 | char *tempfile, *lockfile; |
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32 | FILE *fp; |
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33 | pid_t oldpid; |
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34 | |
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35 | tempfile = calloc(PATH_MAX, sizeof(char)); |
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36 | lockfile = calloc(PATH_MAX, sizeof(char)); |
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37 | |
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38 | snprintf(tempfile, PATH_MAX, "/var/run/%s.tmp", name); |
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39 | snprintf(lockfile, PATH_MAX, "/var/run/%s.pid", name); |
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40 | |
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41 | if ((fp = fopen(tempfile, "w")) == NULL) { |
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42 | perror(name); |
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43 | printf("Can't create lockfile \"%s\"\n", tempfile); |
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44 | free(tempfile); |
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45 | free(lockfile); |
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46 | return 1; |
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47 | } |
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48 | fprintf(fp, "%10u\n", getpid()); |
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49 | fclose(fp); |
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50 | |
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51 | while (TRUE) { |
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52 | if (link(tempfile, lockfile) == 0) { |
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53 | unlink(tempfile); |
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54 | free(tempfile); |
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55 | free(lockfile); |
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56 | return 0; |
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57 | } |
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58 | if ((fp = fopen(lockfile, "r")) == NULL) { |
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59 | perror(name); |
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60 | printf("Can't open lockfile \"%s\"\n", tempfile); |
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61 | unlink(tempfile); |
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62 | free(tempfile); |
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63 | free(lockfile); |
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64 | return 1; |
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65 | } |
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66 | if (fscanf(fp, "%u", &oldpid) != 1) { |
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67 | perror(name); |
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68 | printf("Can't read old pid from \"%s\"\n", tempfile); |
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69 | fclose(fp); |
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70 | unlink(tempfile); |
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71 | free(tempfile); |
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72 | free(lockfile); |
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73 | return 1; |
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74 | } |
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75 | fclose(fp); |
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76 | if (kill(oldpid,0) == -1) { |
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77 | if (errno == ESRCH) { |
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78 | printf("Stale lock found for pid %u\n", oldpid); |
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79 | unlink(lockfile); |
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80 | /* no return, try lock again */ |
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81 | } else { |
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82 | perror(name); |
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83 | printf("Kill for %u failed\n",oldpid); |
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84 | unlink(tempfile); |
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85 | free(tempfile); |
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86 | free(lockfile); |
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87 | return 1; |
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88 | } |
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89 | } else { |
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90 | printf("Another %s is already running, pid=%u\n", name, oldpid); |
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91 | unlink(tempfile); |
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92 | free(tempfile); |
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93 | free(lockfile); |
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94 | return 1; |
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95 | } |
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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 | void ulockprog(char *name) |
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102 | { |
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103 | char *lockfile; |
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104 | pid_t oldpid; |
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105 | FILE *fp; |
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106 | |
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107 | lockfile = calloc(PATH_MAX, sizeof(char)); |
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108 | snprintf(lockfile, PATH_MAX, "/var/run/%s.pid", name); |
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109 | |
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110 | if ((fp = fopen(lockfile, "r")) == NULL) { |
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111 | syslog(LOG_NOTICE, "Can't open lockfile \"%s\"", lockfile); |
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112 | free(lockfile); |
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113 | return; |
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114 | } |
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115 | |
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116 | if (fscanf(fp, "%u", &oldpid) != 1) { |
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117 | syslog(LOG_NOTICE, "Can't read old pid from \"%s\"", lockfile); |
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118 | fclose(fp); |
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119 | unlink(lockfile); |
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120 | free(lockfile); |
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121 | return; |
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122 | } |
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123 | |
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124 | fclose(fp); |
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125 | |
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126 | if (oldpid == getpid()) { |
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127 | (void)unlink(lockfile); |
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128 | } |
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129 | |
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130 | free(lockfile); |
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131 | } |
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132 | |
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133 |