gdb/gdb_wait.h

   1 /* Standard wait macros.
   2    Copyright (C) 2000, 2007, 2008, 2009, 2010, 2011
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef GDB_WAIT_H
  21 #define GDB_WAIT_H
  22
  23 #ifdef HAVE_SYS_WAIT_H
  24 #include <sys/wait.h> /* POSIX */
  25 #else
  26 #ifdef HAVE_WAIT_H
  27 #include <wait.h> /* legacy */
  28 #endif
  29 #endif
  30
  31 /* Define how to access the int that the wait system call stores.
  32    This has been compatible in all Unix systems since time immemorial,
  33    but various well-meaning people have defined various different
  34    words for the same old bits in the same old int (sometimes claimed
  35    to be a struct).  We just know it's an int and we use these macros
  36    to access the bits.  */
  37
  38 /* The following macros are defined equivalently to their definitions
  39    in POSIX.1.  We fail to define WNOHANG and WUNTRACED, which POSIX.1
  40    <sys/wait.h> defines, since our code does not use waitpid() (but
  41    NOTE exception for GNU/Linux below).  We also fail to declare
  42    wait() and waitpid().  */
  43
  44 #ifndef WIFEXITED
  45 #define WIFEXITED(w)    (((w)&0377) == 0)
  46 #endif
  47
  48 #ifndef WIFSIGNALED
  49 #define WIFSIGNALED(w)  (((w)&0377) != 0177 && ((w)&~0377) == 0)
  50 #endif
  51
  52 #ifndef WIFSTOPPED
  53 #ifdef IBM6000
  54
  55 /* Unfortunately, the above comment (about being compatible in all Unix
  56    systems) is not quite correct for AIX, sigh.  And AIX 3.2 can generate
  57    status words like 0x57c (sigtrap received after load), and gdb would
  58    choke on it.  */
  59
  60 #define WIFSTOPPED(w)   ((w)&0x40)
  61
  62 #else
  63 #define WIFSTOPPED(w)   (((w)&0377) == 0177)
  64 #endif
  65 #endif
  66
  67 #ifndef WEXITSTATUS
  68 #define WEXITSTATUS(w)  (((w) >> 8) & 0377) /* same as WRETCODE */
  69 #endif
  70
  71 #ifndef WTERMSIG
  72 #define WTERMSIG(w)     ((w) & 0177)
  73 #endif
  74
  75 #ifndef WSTOPSIG
  76 #define WSTOPSIG        WEXITSTATUS
  77 #endif
  78
  79 /* These are not defined in POSIX, but are used by our programs.  */
  80
  81 #ifndef WSETEXIT
  82 # ifdef W_EXITCODE
  83 #define WSETEXIT(w,status) ((w) = W_EXITCODE(status,0))
  84 # else
  85 #define WSETEXIT(w,status) ((w) = (0 | ((status) << 8)))
  86 # endif
  87 #endif
  88
  89 #ifndef WSETSTOP
  90 # ifdef W_STOPCODE
  91 #define WSETSTOP(w,sig)    ((w) = W_STOPCODE(sig))
  92 # else
  93 #define WSETSTOP(w,sig)    ((w) = (0177 | ((sig) << 8)))
  94 # endif
  95 #endif
  96
  97 /* For native GNU/Linux we may use waitpid and the __WCLONE option.
  98   <GRIPE> It is of course dangerous not to use the REAL header file...
  99   </GRIPE>.  */
 100
 101 /* Bits in the third argument to `waitpid'.  */
 102 #ifndef WNOHANG
 103 #define WNOHANG         1       /* Don't block waiting.  */
 104 #endif
 105
 106 #ifndef WUNTRACED
 107 #define WUNTRACED       2       /* Report status of stopped children.  */
 108 #endif
 109
 110 #ifndef __WCLONE
 111 #define __WCLONE        0x80000000 /* Wait for cloned process.  */
 112 #endif
 113
 114 #endif