include/wait.h

   1 /* Define how to access the int that the wait system call stores.
   2    This has been compatible in all Unix systems since time immemorial,
   3    but various well-meaning people have defined various different
   4    words for the same old bits in the same old int (sometimes claimed
   5    to be a struct).  We just know it's an int and we use these macros
   6    to access the bits.  */
   7
   8 /* The following macros are defined equivalently to their definitions
   9    in POSIX.1.  We fail to define WNOHANG and WUNTRACED, which POSIX.1
  10    <sys/wait.h> defines, since our code does not use waitpid().  We
  11    also fail to declare wait() and waitpid().  */
  12
  13 #ifndef WIFEXITED
  14 #define WIFEXITED(w)    (((w)&0377) == 0)
  15 #endif
  16
  17 #ifndef WIFSIGNALED
  18 #define WIFSIGNALED(w)  (((w)&0377) != 0177 && ((w)&~0377) == 0)
  19 #endif
  20
  21 #ifndef WIFSTOPPED
  22 #ifdef IBM6000
  23
  24 /* Unfortunately, the above comment (about being compatible in all Unix
  25    systems) is not quite correct for AIX, sigh.  And AIX 3.2 can generate
  26    status words like 0x57c (sigtrap received after load), and gdb would
  27    choke on it. */
  28
  29 #define WIFSTOPPED(w)   ((w)&0x40)
  30
  31 #else
  32 #define WIFSTOPPED(w)   (((w)&0377) == 0177)
  33 #endif
  34 #endif
  35
  36 #ifndef WEXITSTATUS
  37 #define WEXITSTATUS(w)  (((w) >> 8) & 0377) /* same as WRETCODE */
  38 #endif
  39
  40 #ifndef WTERMSIG
  41 #define WTERMSIG(w)     ((w) & 0177)
  42 #endif
  43
  44 #ifndef WSTOPSIG
  45 #define WSTOPSIG        WEXITSTATUS
  46 #endif
  47
  48 /* These are not defined in POSIX, but are used by our programs.  */
  49
  50 #define WAITTYPE        int
  51
  52 #ifndef WCOREDUMP
  53 #define WCOREDUMP(w)    (((w)&0200) != 0)
  54 #endif
  55
  56 #ifndef WSETEXIT
  57 #define WSETEXIT(w,status) ((w) = (0 | ((status) << 8)))
  58 #endif
  59
  60 #ifndef WSETSTOP
  61 #define WSETSTOP(w,sig)    ((w) = (0177 | ((sig) << 8)))
  62 #endif
  63