* posix/tst-waitid.c (do_test): Add tests for waitpid with WCONTINUED.

	* posix/sys/wait.h [__WIFCONTINUED] (WIFCONTINUED): New macro.
	* stdlib/stdlib.h [__WIFCONTINUED] (WIFCONTINUED): New macro.
	* sysdeps/generic/bits/waitstatus.h (__W_CONTINUED): New macro.
	[WCONTINUED] (__WIFCONTINUED): New macro.
	(__WIFSIGNALED): Rewritten to exclude __W_CONTINUED value, and have no
	branches.

6 files changed, 108 insertions, 18 deletions

diff --git a/ChangeLog b/ChangeLog
index 37534d5254..97cea59248 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,14 @@
 2004-09-27  Roland McGrath  <roland@redhat.com>
 
+	* posix/tst-waitid.c (do_test): Add tests for waitpid with WCONTINUED.
+
+	* posix/sys/wait.h [__WIFCONTINUED] (WIFCONTINUED): New macro.
+	* stdlib/stdlib.h [__WIFCONTINUED] (WIFCONTINUED): New macro.
+	* sysdeps/generic/bits/waitstatus.h (__W_CONTINUED): New macro.
+	[WCONTINUED] (__WIFCONTINUED): New macro.
+	(__WIFSIGNALED): Rewritten to exclude __W_CONTINUED value, and have no
+	branches.
+
 	* sysdeps/unix/sysv/linux/waitid.c (do_waitid): Add fifth argument to
 	all three syscall uses, not just one!
 
diff --git a/bits/waitstatus.h b/bits/waitstatus.h
index 982c9dbb28..98da41858e 100644
--- a/bits/waitstatus.h
+++ b/bits/waitstatus.h
@@ -1,5 +1,5 @@
 /* Definitions of status bits for `wait' et al.
-   Copyright (C) 1992, 1994, 1996, 1997, 2000 Free Software Foundation, Inc.
+   Copyright (C) 1992,1994,1996,1997,2000,2004 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -38,23 +38,25 @@
 #define	__WIFEXITED(status)	(__WTERMSIG(status) == 0)
 
 /* Nonzero if STATUS indicates termination by a signal.  */
-#ifdef	__GNUC__
-# define __WIFSIGNALED(status) \
-  (__extension__ ({ int __status = (status);				      \
-		    !__WIFSTOPPED(__status) && !__WIFEXITED(__status); }))
-#else	/* Not GCC.  */
-# define __WIFSIGNALED(status)	(!__WIFSTOPPED(status) && !__WIFEXITED(status))
-#endif	/* GCC.  */
+#define __WIFSIGNALED(status) \
+  (((signed char) ((((((status) + 1) & 0xffff) - 1) & 0x7f) + 1) >> 1) > 0)
 
 /* Nonzero if STATUS indicates the child is stopped.  */
 #define	__WIFSTOPPED(status)	(((status) & 0xff) == 0x7f)
 
+/* Nonzero if STATUS indicates the child continued after a stop.  We only
+   define this if <bits/waitflags.h> provides the WCONTINUED flag bit.  */
+#ifdef WCONTINUED
+# define __WIFCONTINUED(status)	((status) == __W_CONTINUED)
+#endif
+
 /* Nonzero if STATUS indicates the child dumped core.  */
 #define	__WCOREDUMP(status)	((status) & __WCOREFLAG)
 
 /* Macros for constructing status values.  */
 #define	__W_EXITCODE(ret, sig)	((ret) << 8 | (sig))
 #define	__W_STOPCODE(sig)	((sig) << 8 | 0x7f)
+#define __W_CONTINUED		0xffff
 #define	__WCOREFLAG		0x80
 
 
diff --git a/posix/sys/wait.h b/posix/sys/wait.h
index e758f9e3ff..372d46c79a 100644
--- a/posix/sys/wait.h
+++ b/posix/sys/wait.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-1994,1996-2001,2003 Free Software Foundation, Inc.
+/* Copyright (C) 1991-1994,1996-2001,2003,2004 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -30,7 +30,7 @@ __BEGIN_DECLS
 #include <signal.h>
 #include <sys/resource.h>
 
-/* These macros could also be defined int <stdlib.h>.  */
+/* These macros could also be defined in <stdlib.h>.  */
 #if !defined _STDLIB_H || !defined __USE_XOPEN
 /* This will define the `W*' macros for the flag
    bits to `waitpid', `wait3', and `wait4'.  */
@@ -84,6 +84,9 @@ typedef union
 # define WIFEXITED(status)	__WIFEXITED(__WAIT_INT(status))
 # define WIFSIGNALED(status)	__WIFSIGNALED(__WAIT_INT(status))
 # define WIFSTOPPED(status)	__WIFSTOPPED(__WAIT_INT(status))
+# ifdef __WIFCONTINUED
+#  define WIFCONTINUED(status)	__WIFCONTINUED(__WAIT_INT(status))
+# endif
 #endif	/* <stdlib.h> not included.  */
 
 #ifdef	__USE_BSD
diff --git a/posix/tst-waitid.c b/posix/tst-waitid.c
index 3e81d7a0ac..642d529a9a 100644
--- a/posix/tst-waitid.c
+++ b/posix/tst-waitid.c
@@ -335,6 +335,77 @@ do_test (int argc, char *argv[])
 	       info.si_signo);
       RETURN (EXIT_FAILURE);
     }
+
+  /* Now stop him again and test waitpid with WCONTINUED.  */
+  expecting_sigchld = 1;
+  if (kill (pid, SIGSTOP) != 0)
+    {
+      error (0, errno, "kill (%d, SIGSTOP)", pid);
+      RETURN (EXIT_FAILURE);
+    }
+  pid_t wpid = waitpid (pid, &fail, WUNTRACED);
+  if (wpid < 0)
+    {
+      error (0, errno, "waitpid WUNTRACED on stopped");
+      RETURN (EXIT_FAILURE);
+    }
+  else if (wpid != pid)
+    {
+      error (0, 0,
+	     "waitpid WUNTRACED on stopped returned %d != %d (status %x)",
+	     wpid, pid, fail);
+      RETURN (EXIT_FAILURE);
+    }
+  else if (!WIFSTOPPED (fail) || WIFSIGNALED (fail) || WIFEXITED (fail)
+	   || WIFCONTINUED (fail) || WSTOPSIG (fail) != SIGSTOP)
+    {
+      error (0, 0, "waitpid WUNTRACED on stopped: status %x", fail);
+      RETURN (EXIT_FAILURE);
+    }
+  CHECK_SIGCHLD ("stopped", CLD_STOPPED, SIGSTOP);
+
+  expecting_sigchld = 1;
+  if (kill (pid, SIGCONT) != 0)
+    {
+      error (0, errno, "kill (%d, SIGCONT)", pid);
+      RETURN (EXIT_FAILURE);
+    }
+
+  /* Wait for the child to have continued.  */
+  sleep (2);
+
+  if (expecting_sigchld)
+    {
+      error (0, 0, "no SIGCHLD seen for SIGCONT (optional)");
+      expecting_sigchld = 0;
+    }
+  else
+    CHECK_SIGCHLD ("continued", CLD_CONTINUED, SIGCONT);
+
+  wpid = waitpid (pid, &fail, WCONTINUED);
+  if (wpid < 0)
+    {
+      if (errno == EINVAL)
+	error (0, 0, "waitpid does not support WCONTINUED");
+      else
+	{
+	  error (0, errno, "waitpid WCONTINUED on continued");
+	  RETURN (EXIT_FAILURE);
+	}
+    }
+  else if (wpid != pid)
+    {
+      error (0, 0,
+	     "waitpid WCONTINUED on continued returned %d != %d (status %x)",
+	     wpid, pid, fail);
+      RETURN (EXIT_FAILURE);
+    }
+  else if (WIFSTOPPED (fail) || WIFSIGNALED (fail) || WIFEXITED (fail)
+	   || !WIFCONTINUED (fail))
+    {
+      error (0, 0, "waitpid WCONTINUED on continued: status %x", fail);
+      RETURN (EXIT_FAILURE);
+    }
 #endif
 
   expecting_sigchld = 1;
diff --git a/stdlib/stdlib.h b/stdlib/stdlib.h
index dc0c712df7..e4f79369a6 100644
--- a/stdlib/stdlib.h
+++ b/stdlib/stdlib.h
@@ -88,6 +88,9 @@ typedef union
 # define WIFEXITED(status)	__WIFEXITED(__WAIT_INT(status))
 # define WIFSIGNALED(status)	__WIFSIGNALED(__WAIT_INT(status))
 # define WIFSTOPPED(status)	__WIFSTOPPED(__WAIT_INT(status))
+# ifdef __WIFCONTINUED
+#  define WIFCONTINUED(status)	__WIFCONTINUED(__WAIT_INT(status))
+# endif
 #endif	/* X/Open and <sys/wait.h> not included.  */
 
 __BEGIN_NAMESPACE_STD
diff --git a/sysdeps/generic/bits/waitstatus.h b/sysdeps/generic/bits/waitstatus.h
index 982c9dbb28..98da41858e 100644
--- a/sysdeps/generic/bits/waitstatus.h
+++ b/sysdeps/generic/bits/waitstatus.h
@@ -1,5 +1,5 @@
 /* Definitions of status bits for `wait' et al.
-   Copyright (C) 1992, 1994, 1996, 1997, 2000 Free Software Foundation, Inc.
+   Copyright (C) 1992,1994,1996,1997,2000,2004 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -38,23 +38,25 @@
 #define	__WIFEXITED(status)	(__WTERMSIG(status) == 0)
 
 /* Nonzero if STATUS indicates termination by a signal.  */
-#ifdef	__GNUC__
-# define __WIFSIGNALED(status) \
-  (__extension__ ({ int __status = (status);				      \
-		    !__WIFSTOPPED(__status) && !__WIFEXITED(__status); }))
-#else	/* Not GCC.  */
-# define __WIFSIGNALED(status)	(!__WIFSTOPPED(status) && !__WIFEXITED(status))
-#endif	/* GCC.  */
+#define __WIFSIGNALED(status) \
+  (((signed char) ((((((status) + 1) & 0xffff) - 1) & 0x7f) + 1) >> 1) > 0)
 
 /* Nonzero if STATUS indicates the child is stopped.  */
 #define	__WIFSTOPPED(status)	(((status) & 0xff) == 0x7f)
 
+/* Nonzero if STATUS indicates the child continued after a stop.  We only
+   define this if <bits/waitflags.h> provides the WCONTINUED flag bit.  */
+#ifdef WCONTINUED
+# define __WIFCONTINUED(status)	((status) == __W_CONTINUED)
+#endif
+
 /* Nonzero if STATUS indicates the child dumped core.  */
 #define	__WCOREDUMP(status)	((status) & __WCOREFLAG)
 
 /* Macros for constructing status values.  */
 #define	__W_EXITCODE(ret, sig)	((ret) << 8 | (sig))
 #define	__W_STOPCODE(sig)	((sig) << 8 | 0x7f)
+#define __W_CONTINUED		0xffff
 #define	__WCOREFLAG		0x80