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1 /* wait.c -- functions for getting wait status values.
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2
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3 Copyright 2011 The Go Authors. All rights reserved.
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4 Use of this source code is governed by a BSD-style
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5 license that can be found in the LICENSE file.
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6
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7 We use C code to extract the wait status so that we can easily be
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8 OS-independent. */
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9
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10 #include <stdint.h>
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11 #include <sys/wait.h>
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12
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13 #include "runtime.h"
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14
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15 #ifndef WCOREDUMP
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16 #define WCOREDUMP(status) (((status) & 0200) != 0)
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17 #endif
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18
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19 #ifndef WIFCONTINUED
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20 #define WIFCONTINUED(x) 0
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21 #endif
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22
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23 extern _Bool Exited (uint32_t *w)
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24 __asm__ (GOSYM_PREFIX "syscall.WaitStatus.Exited");
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25
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26 _Bool
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27 Exited (uint32_t *w)
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28 {
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29 return WIFEXITED (*w) != 0;
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30 }
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31
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32 extern _Bool Signaled (uint32_t *w)
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33 __asm__ (GOSYM_PREFIX "syscall.WaitStatus.Signaled");
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34
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35 _Bool
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36 Signaled (uint32_t *w)
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37 {
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38 return WIFSIGNALED (*w) != 0;
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39 }
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40
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41 extern _Bool Stopped (uint32_t *w)
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42 __asm__ (GOSYM_PREFIX "syscall.WaitStatus.Stopped");
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43
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44 _Bool
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45 Stopped (uint32_t *w)
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46 {
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47 return WIFSTOPPED (*w) != 0;
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48 }
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49
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50 extern _Bool Continued (uint32_t *w)
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51 __asm__ (GOSYM_PREFIX "syscall.WaitStatus.Continued");
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52
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53 _Bool
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54 Continued (uint32_t *w __attribute__ ((unused)))
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55 {
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56 return WIFCONTINUED (*w) != 0;
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57 }
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58
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59 extern _Bool CoreDump (uint32_t *w)
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60 __asm__ (GOSYM_PREFIX "syscall.WaitStatus.CoreDump");
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61
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62 _Bool
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63 CoreDump (uint32_t *w)
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64 {
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65 return WCOREDUMP (*w) != 0;
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66 }
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67
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68 extern intgo ExitStatus (uint32_t *w)
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69 __asm__ (GOSYM_PREFIX "syscall.WaitStatus.ExitStatus");
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70
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71 intgo
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72 ExitStatus (uint32_t *w)
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73 {
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74 if (!WIFEXITED (*w))
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75 return -1;
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76 return WEXITSTATUS (*w);
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77 }
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78
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79 extern intgo Signal (uint32_t *w)
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80 __asm__ (GOSYM_PREFIX "syscall.WaitStatus.Signal");
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81
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82 intgo
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83 Signal (uint32_t *w)
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84 {
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85 if (!WIFSIGNALED (*w))
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86 return -1;
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87 return WTERMSIG (*w);
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88 }
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89
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90 extern intgo StopSignal (uint32_t *w)
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91 __asm__ (GOSYM_PREFIX "syscall.WaitStatus.StopSignal");
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92
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93 intgo
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94 StopSignal (uint32_t *w)
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95 {
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96 if (!WIFSTOPPED (*w))
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97 return -1;
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98 return WSTOPSIG (*w);
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99 }
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100
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101 extern intgo TrapCause (uint32_t *w)
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102 __asm__ (GOSYM_PREFIX "syscall.WaitStatus.TrapCause");
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103
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104 intgo
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105 TrapCause (uint32_t *w __attribute__ ((unused)))
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106 {
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107 #ifndef __linux__
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108 return -1;
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109 #else
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110 if (!WIFSTOPPED (*w) || WSTOPSIG (*w) != SIGTRAP)
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111 return -1;
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112 return *w >> 16;
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113 #endif
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114 }
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