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 extern _Bool Exited (uint32_t *w)
  20   __asm__ (GOSYM_PREFIX "syscall.Exited.N18_syscall.WaitStatus");
  21
  22 _Bool
  23 Exited (uint32_t *w)
  24 {
  25   return WIFEXITED (*w) != 0;
  26 }
  27
  28 extern _Bool Signaled (uint32_t *w)
  29   __asm__ (GOSYM_PREFIX "syscall.Signaled.N18_syscall.WaitStatus");
  30
  31 _Bool
  32 Signaled (uint32_t *w)
  33 {
  34   return WIFSIGNALED (*w) != 0;
  35 }
  36
  37 extern _Bool Stopped (uint32_t *w)
  38   __asm__ (GOSYM_PREFIX "syscall.Stopped.N18_syscall.WaitStatus");
  39
  40 _Bool
  41 Stopped (uint32_t *w)
  42 {
  43   return WIFSTOPPED (*w) != 0;
  44 }
  45
  46 extern _Bool Continued (uint32_t *w)
  47   __asm__ (GOSYM_PREFIX "syscall.Continued.N18_syscall.WaitStatus");
  48
  49 _Bool
  50 Continued (uint32_t *w)
  51 {
  52   return WIFCONTINUED (*w) != 0;
  53 }
  54
  55 extern _Bool CoreDump (uint32_t *w)
  56   __asm__ (GOSYM_PREFIX "syscall.CoreDump.N18_syscall.WaitStatus");
  57
  58 _Bool
  59 CoreDump (uint32_t *w)
  60 {
  61   return WCOREDUMP (*w) != 0;
  62 }
  63
  64 extern int ExitStatus (uint32_t *w)
  65   __asm__ (GOSYM_PREFIX "syscall.ExitStatus.N18_syscall.WaitStatus");
  66
  67 int
  68 ExitStatus (uint32_t *w)
  69 {
  70   if (!WIFEXITED (*w))
  71     return -1;
  72   return WEXITSTATUS (*w);
  73 }
  74
  75 extern int Signal (uint32_t *w)
  76   __asm__ (GOSYM_PREFIX "syscall.Signal.N18_syscall.WaitStatus");
  77
  78 int
  79 Signal (uint32_t *w)
  80 {
  81   if (!WIFSIGNALED (*w))
  82     return -1;
  83   return WTERMSIG (*w);
  84 }
  85
  86 extern int StopSignal (uint32_t *w)
  87   __asm__ (GOSYM_PREFIX "syscall.StopSignal.N18_syscall.WaitStatus");
  88
  89 int
  90 StopSignal (uint32_t *w)
  91 {
  92   if (!WIFSTOPPED (*w))
  93     return -1;
  94   return WSTOPSIG (*w);
  95 }
  96
  97 extern int TrapCause (uint32_t *w)
  98   __asm__ (GOSYM_PREFIX "syscall.TrapCause.N18_syscall.WaitStatus");
  99
 100 int
 101 TrapCause (uint32_t *w __attribute__ ((unused)))
 102 {
 103 #ifndef __linux__
 104   return -1;
 105 #else
 106   if (!WIFSTOPPED (*w) || WSTOPSIG (*w) != SIGTRAP)
 107     return -1;
 108   return *w >> 16;
 109 #endif
 110 }