Sun, 27 Nov 2022 13:33:30 +0100
improve daemon startup
parent will wait until daemon is started and returns error code if startup failed
daemon startup log messages will be printed by parent
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1 | /* |
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2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. |
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3 | * |
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4 | * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions are met: |
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8 | * |
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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 | * |
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12 | * 2. Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * |
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16 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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17 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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20 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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26 | * POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |
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29 | /** |
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30 | * \file utils.h |
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31 | * |
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32 | * \brief General purpose utility functions. |
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33 | * |
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34 | * \author Mike Becker |
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35 | * \author Olaf Wintermann |
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36 | * \version 3.0 |
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37 | * \copyright 2-Clause BSD License |
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38 | */ |
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39 | |
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40 | #ifndef UCX_UTILS_H |
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41 | #define UCX_UTILS_H |
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42 | |
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43 | #include "common.h" |
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44 | |
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45 | #ifdef __cplusplus |
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46 | extern "C" { |
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47 | #endif |
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48 | |
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49 | /** |
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50 | * Convenience macro for a for loop that counts from zero to n-1. |
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51 | */ |
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52 | #define cx_for_n(varname, n) for (size_t varname = 0 ; (varname) < (n) ; (varname)++) |
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53 | |
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54 | // cx_szmul() definition |
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55 | |
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56 | #if (__GNUC__ >= 5 || defined(__clang__)) && !defined(CX_NO_SZMUL_BUILTIN) |
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57 | #define CX_SZMUL_BUILTIN |
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58 | |
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59 | #if __WORDSIZE == 32 |
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60 | /** |
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61 | * Alias for \c __builtin_umul_overflow. |
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62 | * |
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63 | * Performs a multiplication of size_t values and checks for overflow. |
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64 | * |
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65 | * @param a first operand |
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66 | * @param b second operand |
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67 | * @param result a pointer to a size_t, where the result should |
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68 | * be stored |
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69 | * @return zero, if no overflow occurred and the result is correct, non-zero |
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70 | * otherwise |
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71 | */ |
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72 | #define cx_szmul(a, b, result) __builtin_umul_overflow(a, b, result) |
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73 | #else // __WORDSIZE != 32 |
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74 | /** |
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75 | * Alias for \c __builtin_umull_overflow. |
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76 | * |
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77 | * Performs a multiplication of size_t values and checks for overflow. |
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78 | * |
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79 | * @param a first operand |
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80 | * @param b second operand |
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81 | * @param result a pointer to a size_t, where the result should |
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82 | * be stored |
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83 | * @return zero, if no overflow occurred and the result is correct, non-zero |
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84 | * otherwise |
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85 | */ |
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86 | #define cx_szmul(a, b, result) __builtin_umull_overflow(a, b, result) |
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87 | #endif // __WORDSIZE |
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88 | |
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89 | #else // no GNUC or clang bultin |
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90 | |
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91 | /** |
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92 | * Performs a multiplication of size_t values and checks for overflow. |
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93 | * |
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94 | * @param a first operand |
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95 | * @param b second operand |
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96 | * @param result a pointer to a size_t, where the result should |
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97 | * be stored |
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98 | * @return zero, if no overflow occurred and the result is correct, non-zero |
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99 | * otherwise |
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100 | */ |
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101 | #define cx_szmul(a, b, result) cx_szmul_impl(a, b, result) |
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102 | |
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103 | /** |
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104 | * Performs a multiplication of size_t values and checks for overflow. |
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105 | * |
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106 | * This is a custom implementation in case there is no compiler builtin |
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107 | * available. |
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108 | * |
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109 | * @param a first operand |
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110 | * @param b second operand |
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111 | * @param result a pointer to a size_t where the result should be stored |
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112 | * @return zero, if no overflow occurred and the result is correct, non-zero |
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113 | * otherwise |
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114 | */ |
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115 | int cx_szmul_impl(size_t a, size_t b, size_t *result); |
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116 | |
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117 | #endif |
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118 | |
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119 | #ifdef __cplusplus |
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120 | } |
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121 | #endif |
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122 | |
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123 | #endif // UCX_UTILS_H |