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1 | office | 1 | /** |
2 | * @file bprocess_example.c |
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3 | * @author Ambroz Bizjak <ambrop7@gmail.com> |
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4 | * |
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5 | * @section LICENSE |
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6 | * |
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7 | * Redistribution and use in source and binary forms, with or without |
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8 | * modification, are permitted provided that the following conditions are met: |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * 2. Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * 3. Neither the name of the author nor the |
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15 | * names of its contributors may be used to endorse or promote products |
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16 | * derived from this software without specific prior written permission. |
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17 | * |
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18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND |
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19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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20 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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21 | * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
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22 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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23 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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24 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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25 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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27 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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28 | */ |
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29 | |||
30 | #include <stddef.h> |
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31 | #include <unistd.h> |
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32 | |||
33 | #include <misc/debug.h> |
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34 | #include <base/DebugObject.h> |
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35 | #include <base/BLog.h> |
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36 | #include <system/BReactor.h> |
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37 | #include <system/BUnixSignal.h> |
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38 | #include <system/BTime.h> |
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39 | #include <system/BProcess.h> |
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40 | |||
41 | BReactor reactor; |
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42 | BUnixSignal unixsignal; |
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43 | BProcessManager manager; |
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44 | BProcess process; |
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45 | |||
46 | static void unixsignal_handler (void *user, int signo); |
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47 | static void process_handler (void *user, int normally, uint8_t normally_exit_status); |
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48 | |||
49 | int main (int argc, char **argv) |
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50 | { |
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51 | if (argc <= 0) { |
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52 | return 1; |
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53 | } |
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54 | |||
55 | int ret = 1; |
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56 | |||
57 | if (argc < 2) { |
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58 | printf("Usage: %s <program> [argument ...]\n", argv[0]); |
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59 | goto fail0; |
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60 | } |
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61 | |||
62 | char *program = argv[1]; |
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63 | |||
64 | // init time |
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65 | BTime_Init(); |
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66 | |||
67 | // init logger |
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68 | BLog_InitStdout(); |
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69 | |||
70 | // init reactor (event loop) |
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71 | if (!BReactor_Init(&reactor)) { |
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72 | DEBUG("BReactor_Init failed"); |
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73 | goto fail1; |
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74 | } |
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75 | |||
76 | // choose signals to catch |
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77 | sigset_t set; |
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78 | sigemptyset(&set); |
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79 | sigaddset(&set, SIGINT); |
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80 | sigaddset(&set, SIGTERM); |
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81 | |||
82 | // init BUnixSignal for catching signals |
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83 | if (!BUnixSignal_Init(&unixsignal, &reactor, set, unixsignal_handler, NULL)) { |
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84 | DEBUG("BUnixSignal_Init failed"); |
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85 | goto fail2; |
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86 | } |
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87 | |||
88 | // init process manager |
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89 | if (!BProcessManager_Init(&manager, &reactor)) { |
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90 | DEBUG("BProcessManager_Init failed"); |
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91 | goto fail3; |
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92 | } |
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93 | |||
94 | char **p_argv = argv + 1; |
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95 | |||
96 | // map fds 0, 1, 2 in child to fds 0, 1, 2 in parent |
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97 | int fds[] = { 0, 1, 2, -1 }; |
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98 | int fds_map[] = { 0, 1, 2 }; |
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99 | |||
100 | // start child process |
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101 | if (!BProcess_InitWithFds(&process, &manager, process_handler, NULL, program, p_argv, NULL, fds, fds_map)) { |
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102 | DEBUG("BProcess_Init failed"); |
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103 | goto fail4; |
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104 | } |
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105 | |||
106 | // enter event loop |
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107 | ret = BReactor_Exec(&reactor); |
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108 | |||
109 | BProcess_Free(&process); |
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110 | fail4: |
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111 | BProcessManager_Free(&manager); |
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112 | fail3: |
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113 | BUnixSignal_Free(&unixsignal, 0); |
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114 | fail2: |
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115 | BReactor_Free(&reactor); |
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116 | fail1: |
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117 | BLog_Free(); |
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118 | fail0: |
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119 | DebugObjectGlobal_Finish(); |
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120 | |||
121 | return ret; |
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122 | } |
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123 | |||
124 | void unixsignal_handler (void *user, int signo) |
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125 | { |
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126 | DEBUG("received %s, terminating child", (signo == SIGINT ? "SIGINT" : "SIGTERM")); |
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127 | |||
128 | // send SIGTERM to child |
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129 | BProcess_Terminate(&process); |
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130 | } |
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131 | |||
132 | void process_handler (void *user, int normally, uint8_t normally_exit_status) |
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133 | { |
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134 | DEBUG("process terminated"); |
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135 | |||
136 | int ret = (normally ? normally_exit_status : 1); |
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137 | |||
138 | // return from event loop |
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139 | BReactor_Quit(&reactor, ret); |
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140 | } |