gdbsupport/gdb_wait.h

   1 /* Standard wait macros.
   2    Copyright (C) 2000-2020 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 COMMON_GDB_WAIT_H
  20 #define COMMON_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    For MinGW, we use the fact that when a Windows program is
  44    terminated by a fatal exception, its exit code is the value of that
  45    exception, as defined by the various EXCEPTION_* symbols in the
  46    Windows API headers.  See also gdb_wait.c.  */
  47
  48 #ifndef WIFEXITED
  49 # ifdef __MINGW32__
  50 #  define WIFEXITED(w)  (((w) & 0xC0000000) == 0)
  51 # else
  52 #  define WIFEXITED(w)  (((w)&0377) == 0)
  53 # endif
  54 #endif
  55
  56 #ifndef WIFSIGNALED
  57 # ifdef __MINGW32__
  58 #  define WIFSIGNALED(w)        (((w) & 0xC0000000) == 0xC0000000)
  59 # else
  60 #  define WIFSIGNALED(w)        (((w)&0377) != 0177 && ((w)&~0377) == 0)
  61 # endif
  62 #endif
  63
  64 #ifndef WIFSTOPPED
  65 #ifdef IBM6000
  66
  67 /* Unfortunately, the above comment (about being compatible in all Unix
  68    systems) is not quite correct for AIX, sigh.  And AIX 3.2 can generate
  69    status words like 0x57c (sigtrap received after load), and gdb would
  70    choke on it.  */
  71
  72 #define WIFSTOPPED(w)   ((w)&0x40)
  73
  74 #else
  75 #define WIFSTOPPED(w)   (((w)&0377) == 0177)
  76 #endif
  77 #endif
  78
  79 #ifndef WEXITSTATUS
  80 # ifdef __MINGW32__
  81 #  define WEXITSTATUS(w)        ((w) & ~0xC0000000)
  82 # else
  83 #  define WEXITSTATUS(w)        (((w) >> 8) & 0377) /* same as WRETCODE */
  84 # endif
  85 #endif
  86
  87 #ifndef WTERMSIG
  88 # ifdef __MINGW32__
  89 extern int windows_status_to_termsig (unsigned long);
  90 #  define WTERMSIG(w)   windows_status_to_termsig (w)
  91 # else
  92 #  define WTERMSIG(w)   ((w) & 0177)
  93 # endif
  94 #endif
  95
  96 #ifndef WSTOPSIG
  97 #define WSTOPSIG        WEXITSTATUS
  98 #endif
  99
 100 /* These are not defined in POSIX, but are used by our programs.  */
 101
 102 #ifndef WSETEXIT
 103 # ifdef W_EXITCODE
 104 #define WSETEXIT(w,status) ((w) = W_EXITCODE(status,0))
 105 # else
 106 #define WSETEXIT(w,status) ((w) = (0 | ((status) << 8)))
 107 # endif
 108 #endif
 109
 110 #ifndef W_STOPCODE
 111 #define W_STOPCODE(sig) ((sig) << 8 | 0x7f)
 112 #endif
 113
 114 #ifndef WSETSTOP
 115 #define WSETSTOP(w,sig)    ((w) = W_STOPCODE(sig))
 116 #endif
 117
 118 /* For native GNU/Linux we may use waitpid and the __WCLONE option.
 119   <GRIPE> It is of course dangerous not to use the REAL header file...
 120   </GRIPE>.  */
 121
 122 /* Bits in the third argument to `waitpid'.  */
 123 #ifndef WNOHANG
 124 #define WNOHANG         1       /* Don't block waiting.  */
 125 #endif
 126
 127 #ifndef WUNTRACED
 128 #define WUNTRACED       2       /* Report status of stopped children.  */
 129 #endif
 130
 131 #ifndef __WCLONE
 132 #define __WCLONE        0x80000000 /* Wait for cloned process.  */
 133 #endif
 134
 135 #endif /* COMMON_GDB_WAIT_H */