Use waitpid, not wait3, etc. (#44)

This removes code that uses `union wait` status in favor of code
that uses `int` status. This has been the correct way since
SvR4, BSD 4.3, POSIX.

inc/version.h

@@ -255,7 +255,6 @@ typedef signed char s_char;
 #undef HAS_GETHOSTID
 #define BSD_COMP 1
 #define SYSVSIGNALS 1
-#define WAITINT 1
 #define L_SET SEEK_SET
 #define NOFORN
 #define LOCK_X_UPDATES 1
@@ -297,7 +296,6 @@ typedef signed char s_char;
 /* MacOS X, FreeBSD - mostly POSIX-compliant Unix */
 #define NOETHER 1
 #define XWINDOWS 1
-#define WAITINT 1
 
 #undef REGISTER
 #define REGISTER

src/unixfork.c

@@ -479,47 +479,26 @@ int fork_Unix() {
 
       case 'W': /* Wait for a process to die. */
       {
-#if defined(SYSVONLY) || defined(WAITINT)
         int status;
-#else
-        union wait status;
-#endif /* SYSVONLY */
 
 #ifdef OCR
         int slot;
 #endif
 
-#if defined(SYSVONLY) || defined(WAITINT)
         status = 0;
-#else
-        status.w_status = 0;
-#endif /* SYSVONLY */
 
         IOBuf[0] = 0;
         IOBuf[1] = 0;
         DBPRINT(("About to wait for processes.\n"));
-#ifdef SYSVONLY
       retry1:
         pid = waitpid(-1, &status, WNOHANG);
         if (pid == -1 && errno == EINTR) goto retry1;
-#else
-        pid = wait3(&status, WNOHANG, 0);
-#endif /* SYSVONLY */
-        if (pid > 0)
-
-        {
-/* Ignore processes which are suspended but haven't exited
-   (this shouldn't happen) */
-#if defined(SYSVONLY) || defined(WAITINT)
+        if (pid > 0) {
+          /* Ignore processes which are suspended but haven't exited
+             (this shouldn't happen) */
           if (WIFSTOPPED(status)) break;
           IOBuf[3] = status >> 8;
           IOBuf[2] = status & 0xFF;
-#else
-          if (status.w_stopval == WSTOPPED) break;
-          IOBuf[3] = status.w_T.w_Retcode;
-          IOBuf[2] = status.w_T.w_Termsig;
-#endif /* SYSVONLY */
-
           IOBuf[1] = pid & 0xFF;
           IOBuf[0] = (pid >> 8) & 0xFF;
         }

src/uraid.c

@@ -376,12 +376,7 @@ LispPTR uraid_commands() {
   LispPTR index;
   DefCell *defcell68k;
 #ifndef DOS
-#if defined(SYSVONLY) || defined(WAITINT)
   int status;
-#else
-  union wait status;
-#endif /* SYSVONLY */
-
 #endif /* DOS */
 
   if (URaid_argnum == -1) {