gdb/gdb_wait.h

   1 /* Standard wait macros.
   2    Copyright 2000 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #ifndef GDB_WAIT_H
  22 #define GDB_WAIT_H
  23
  24 #ifdef HAVE_SYS_WAIT_H
  25 #include <sys/wait.h> /* POSIX */
  26 #else
  27 #ifdef HAVE_WAIT_H
  28 #include <wait.h> /* legacy */
  29 #endif
  30 #endif
  31
  32 /* Define how to access the int that the wait system call stores.
  33    This has been compatible in all Unix systems since time immemorial,
  34    but various well-meaning people have defined various different
  35    words for the same old bits in the same old int (sometimes claimed
  36    to be a struct).  We just know it's an int and we use these macros
  37    to access the bits.  */
  38
  39 /* The following macros are defined equivalently to their definitions
  40    in POSIX.1.  We fail to define WNOHANG and WUNTRACED, which POSIX.1
  41    <sys/wait.h> defines, since our code does not use waitpid() (but
  42    NOTE exception for GNU/Linux below).  We also fail to declare
  43    wait() and waitpid().  */
  44
  45 #ifndef WIFEXITED
  46 #define WIFEXITED(w)    (((w)&0377) == 0)
  47 #endif
  48
  49 #ifndef WIFSIGNALED
  50 #define WIFSIGNALED(w)  (((w)&0377) != 0177 && ((w)&~0377) == 0)
  51 #endif
  52
  53 #ifndef WIFSTOPPED
  54 #ifdef IBM6000
  55
  56 /* Unfortunately, the above comment (about being compatible in all Unix
  57    systems) is not quite correct for AIX, sigh.  And AIX 3.2 can generate
  58    status words like 0x57c (sigtrap received after load), and gdb would
  59    choke on it. */
  60
  61 #define WIFSTOPPED(w)   ((w)&0x40)
  62
  63 #else
  64 #define WIFSTOPPED(w)   (((w)&0377) == 0177)
  65 #endif
  66 #endif
  67
  68 #ifndef WEXITSTATUS
  69 #define WEXITSTATUS(w)  (((w) >> 8) & 0377) /* same as WRETCODE */
  70 #endif
  71
  72 #ifndef WTERMSIG
  73 #define WTERMSIG(w)     ((w) & 0177)
  74 #endif
  75
  76 #ifndef WSTOPSIG
  77 #define WSTOPSIG        WEXITSTATUS
  78 #endif
  79
  80 /* These are not defined in POSIX, but are used by our programs.  */
  81
  82 #define WAITTYPE        int
  83
  84 #ifndef WCOREDUMP
  85 #define WCOREDUMP(w)    (((w)&0200) != 0)
  86 #endif
  87
  88 #ifndef WSETEXIT
  89 # ifdef W_EXITCODE
  90 #define WSETEXIT(w,status) ((w) = W_EXITCODE(status,0))
  91 # else
  92 #define WSETEXIT(w,status) ((w) = (0 | ((status) << 8)))
  93 # endif
  94 #endif
  95
  96 #ifndef WSETSTOP
  97 # ifdef W_STOPCODE
  98 #define WSETSTOP(w,sig)    ((w) = W_STOPCODE(sig))
  99 # else
 100 #define WSETSTOP(w,sig)    ((w) = (0177 | ((sig) << 8)))
 101 # endif
 102 #endif
 103
 104 /* For native GNU/Linux we may use waitpid and the __WCLONE option.
 105   <GRIPE> It is of course dangerous not to use the REAL header file...
 106   </GRIPE>.  */
 107
 108 /* Bits in the third argument to `waitpid'.  */
 109 #ifndef WNOHANG
 110 #define WNOHANG         1       /* Don't block waiting.  */
 111 #endif
 112
 113 #ifndef WUNTRACED
 114 #define WUNTRACED       2       /* Report status of stopped children.  */
 115 #endif
 116
 117 #ifndef __WCLONE
 118 #define __WCLONE        0x80000000 /* Wait for cloned process.  */
 119 #endif
 120
 121 #endif