gdb/gdb_wait.h

   1 /* Standard wait macros.
   2    Copyright (C) 2000, 2007, 2008 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 3 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, see <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef GDB_WAIT_H
  20 #define GDB_WAIT_H
  21
  22 #ifdef HAVE_SYS_WAIT_H
  23 #include <sys/wait.h> /* POSIX */
  24 #else
  25 #ifdef HAVE_WAIT_H
  26 #include <wait.h> /* legacy */
  27 #endif
  28 #endif
  29
  30 /* Define how to access the int that the wait system call stores.
  31    This has been compatible in all Unix systems since time immemorial,
  32    but various well-meaning people have defined various different
  33    words for the same old bits in the same old int (sometimes claimed
  34    to be a struct).  We just know it's an int and we use these macros
  35    to access the bits.  */
  36
  37 /* The following macros are defined equivalently to their definitions
  38    in POSIX.1.  We fail to define WNOHANG and WUNTRACED, which POSIX.1
  39    <sys/wait.h> defines, since our code does not use waitpid() (but
  40    NOTE exception for GNU/Linux below).  We also fail to declare
  41    wait() and waitpid().  */
  42
  43 #ifndef WIFEXITED
  44 #define WIFEXITED(w)    (((w)&0377) == 0)
  45 #endif
  46
  47 #ifndef WIFSIGNALED
  48 #define WIFSIGNALED(w)  (((w)&0377) != 0177 && ((w)&~0377) == 0)
  49 #endif
  50
  51 #ifndef WIFSTOPPED
  52 #ifdef IBM6000
  53
  54 /* Unfortunately, the above comment (about being compatible in all Unix
  55    systems) is not quite correct for AIX, sigh.  And AIX 3.2 can generate
  56    status words like 0x57c (sigtrap received after load), and gdb would
  57    choke on it. */
  58
  59 #define WIFSTOPPED(w)   ((w)&0x40)
  60
  61 #else
  62 #define WIFSTOPPED(w)   (((w)&0377) == 0177)
  63 #endif
  64 #endif
  65
  66 #ifndef WEXITSTATUS
  67 #define WEXITSTATUS(w)  (((w) >> 8) & 0377) /* same as WRETCODE */
  68 #endif
  69
  70 #ifndef WTERMSIG
  71 #define WTERMSIG(w)     ((w) & 0177)
  72 #endif
  73
  74 #ifndef WSTOPSIG
  75 #define WSTOPSIG        WEXITSTATUS
  76 #endif
  77
  78 /* These are not defined in POSIX, but are used by our programs.  */
  79
  80 #define WAITTYPE        int
  81
  82 #ifndef WCOREDUMP
  83 #define WCOREDUMP(w)    (((w)&0200) != 0)
  84 #endif
  85
  86 #ifndef WSETEXIT
  87 # ifdef W_EXITCODE
  88 #define WSETEXIT(w,status) ((w) = W_EXITCODE(status,0))
  89 # else
  90 #define WSETEXIT(w,status) ((w) = (0 | ((status) << 8)))
  91 # endif
  92 #endif
  93
  94 #ifndef WSETSTOP
  95 # ifdef W_STOPCODE
  96 #define WSETSTOP(w,sig)    ((w) = W_STOPCODE(sig))
  97 # else
  98 #define WSETSTOP(w,sig)    ((w) = (0177 | ((sig) << 8)))
  99 # endif
 100 #endif
 101
 102 /* For native GNU/Linux we may use waitpid and the __WCLONE option.
 103   <GRIPE> It is of course dangerous not to use the REAL header file...
 104   </GRIPE>.  */
 105
 106 /* Bits in the third argument to `waitpid'.  */
 107 #ifndef WNOHANG
 108 #define WNOHANG         1       /* Don't block waiting.  */
 109 #endif
 110
 111 #ifndef WUNTRACED
 112 #define WUNTRACED       2       /* Report status of stopped children.  */
 113 #endif
 114
 115 #ifndef __WCLONE
 116 #define __WCLONE        0x80000000 /* Wait for cloned process.  */
 117 #endif
 118
 119 #endif