Thu, 25 Feb 2016 20:26:40 +0100
Fixed compiler warning
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Brewco first phase development configuration structure.
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1 | /***************************************************************************** |
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Brewco first phase development configuration structure.
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2 | * Copyright (C) 2015 |
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Brewco first phase development configuration structure.
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3 | * |
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4 | * Michiel Broek <mbroek at mbse dot eu> |
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Brewco first phase development configuration structure.
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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 ThermFerm; 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 "lock.h" |
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24 | #include "brewco.h" |
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25 | |
465 | 26 | extern char *varpath; |
27 | ||
28 | ||
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29 | /* |
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30 | * Put a lock on this program. |
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31 | */ |
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32 | int lockprog(char *name) |
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33 | { |
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34 | char *tempfile, *lockfile; |
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35 | FILE *fp; |
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36 | pid_t oldpid; |
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37 | |
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38 | tempfile = calloc(PATH_MAX, sizeof(char)); |
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39 | lockfile = calloc(PATH_MAX, sizeof(char)); |
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40 | |
465 | 41 | snprintf(tempfile, PATH_MAX, "%s%s.tmp", varpath, name); |
42 | snprintf(lockfile, PATH_MAX, "%s%s.pid", varpath, name); | |
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43 | |
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44 | if ((fp = fopen(tempfile, "w")) == NULL) { |
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45 | perror(name); |
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46 | printf("Can't create lockfile \"%s\"\n", tempfile); |
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47 | free(tempfile); |
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48 | free(lockfile); |
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49 | return 1; |
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50 | } |
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51 | fprintf(fp, "%10u\n", getpid()); |
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52 | fclose(fp); |
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53 | |
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54 | while (TRUE) { |
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55 | if (link(tempfile, lockfile) == 0) { |
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56 | unlink(tempfile); |
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57 | free(tempfile); |
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58 | free(lockfile); |
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59 | return 0; |
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60 | } |
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61 | if ((fp = fopen(lockfile, "r")) == NULL) { |
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62 | perror(name); |
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63 | printf("Can't open lockfile \"%s\"\n", tempfile); |
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64 | unlink(tempfile); |
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65 | free(tempfile); |
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66 | free(lockfile); |
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67 | return 1; |
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68 | } |
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69 | if (fscanf(fp, "%u", &oldpid) != 1) { |
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70 | perror(name); |
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71 | printf("Can't read old pid from \"%s\"\n", tempfile); |
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72 | fclose(fp); |
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73 | unlink(tempfile); |
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74 | free(tempfile); |
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75 | free(lockfile); |
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76 | return 1; |
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77 | } |
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78 | fclose(fp); |
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79 | if (kill(oldpid,0) == -1) { |
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80 | if (errno == ESRCH) { |
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81 | printf("Stale lock found for pid %u\n", oldpid); |
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82 | unlink(lockfile); |
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83 | /* no return, try lock again */ |
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84 | } else { |
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85 | perror(name); |
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86 | printf("Kill for %u failed\n",oldpid); |
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87 | unlink(tempfile); |
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88 | free(tempfile); |
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89 | free(lockfile); |
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90 | return 1; |
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91 | } |
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92 | } else { |
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93 | printf("Another %s is already running, pid=%u\n", name, oldpid); |
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94 | unlink(tempfile); |
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95 | free(tempfile); |
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96 | free(lockfile); |
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97 | return 1; |
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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 | |
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103 | |
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104 | void ulockprog(char *name) |
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105 | { |
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106 | char *lockfile; |
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107 | pid_t oldpid; |
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108 | FILE *fp; |
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109 | |
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110 | lockfile = calloc(PATH_MAX, sizeof(char)); |
465 | 111 | snprintf(lockfile, PATH_MAX, "%s%s.pid", varpath, name); |
434
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112 | |
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113 | if ((fp = fopen(lockfile, "r")) == NULL) { |
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114 | syslog(LOG_NOTICE, "Can't open lockfile \"%s\"", lockfile); |
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115 | free(lockfile); |
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116 | return; |
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117 | } |
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118 | |
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119 | if (fscanf(fp, "%u", &oldpid) != 1) { |
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120 | syslog(LOG_NOTICE, "Can't read old pid from \"%s\"", lockfile); |
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121 | fclose(fp); |
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122 | unlink(lockfile); |
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123 | free(lockfile); |
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124 | return; |
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125 | } |
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126 | |
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127 | fclose(fp); |
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128 | |
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129 | if (oldpid == getpid()) { |
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130 | (void)unlink(lockfile); |
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131 | } |
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132 | |
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133 | free(lockfile); |
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134 | } |
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135 | |
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136 |