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 extern _Bool Exited (uint32_t *w)
  16   __asm__ (GOSYM_PREFIX "syscall.Exited.N18_syscall.WaitStatus");
  17
  18 _Bool
  19 Exited (uint32_t *w)
  20 {
  21   return WIFEXITED (*w) != 0;
  22 }
  23
  24 extern _Bool Signaled (uint32_t *w)
  25   __asm__ (GOSYM_PREFIX "syscall.Signaled.N18_syscall.WaitStatus");
  26
  27 _Bool
  28 Signaled (uint32_t *w)
  29 {
  30   return WIFSIGNALED (*w) != 0;
  31 }
  32
  33 extern _Bool Stopped (uint32_t *w)
  34   __asm__ (GOSYM_PREFIX "syscall.Stopped.N18_syscall.WaitStatus");
  35
  36 _Bool
  37 Stopped (uint32_t *w)
  38 {
  39   return WIFSTOPPED (*w) != 0;
  40 }
  41
  42 extern _Bool Continued (uint32_t *w)
  43   __asm__ (GOSYM_PREFIX "syscall.Continued.N18_syscall.WaitStatus");
  44
  45 _Bool
  46 Continued (uint32_t *w)
  47 {
  48   return WIFCONTINUED (*w) != 0;
  49 }
  50
  51 extern _Bool CoreDump (uint32_t *w)
  52   __asm__ (GOSYM_PREFIX "syscall.CoreDump.N18_syscall.WaitStatus");
  53
  54 _Bool
  55 CoreDump (uint32_t *w)
  56 {
  57   return WCOREDUMP (*w) != 0;
  58 }
  59
  60 extern int ExitStatus (uint32_t *w)
  61   __asm__ (GOSYM_PREFIX "syscall.ExitStatus.N18_syscall.WaitStatus");
  62
  63 int
  64 ExitStatus (uint32_t *w)
  65 {
  66   if (!WIFEXITED (*w))
  67     return -1;
  68   return WEXITSTATUS (*w);
  69 }
  70
  71 extern int Signal (uint32_t *w)
  72   __asm__ (GOSYM_PREFIX "syscall.Signal.N18_syscall.WaitStatus");
  73
  74 int
  75 Signal (uint32_t *w)
  76 {
  77   if (!WIFSIGNALED (*w))
  78     return -1;
  79   return WTERMSIG (*w);
  80 }
  81
  82 extern int StopSignal (uint32_t *w)
  83   __asm__ (GOSYM_PREFIX "syscall.StopSignal.N18_syscall.WaitStatus");
  84
  85 int
  86 StopSignal (uint32_t *w)
  87 {
  88   if (!WIFSTOPPED (*w))
  89     return -1;
  90   return WSTOPSIG (*w);
  91 }
  92
  93 extern int TrapCause (uint32_t *w)
  94   __asm__ (GOSYM_PREFIX "syscall.TrapCause.N18_syscall.WaitStatus");
  95
  96 int
  97 TrapCause (uint32_t *w __attribute__ ((unused)))
  98 {
  99 #ifndef __linux__
 100   return -1;
 101 #else
 102   if (!WIFSTOPPED (*w) || WSTOPSIG (*w) != SIGTRAP)
 103     return -1;
 104   return *w >> 16;
 105 #endif
 106 }