libgo/go/syscall/wait.c

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