posix: Remove posix waitid

The POSIX waitid implementation is problematic in some ways:

  - It emulates using waitpid, which default implementation calls
    wait4 and wait4 returns ENOSYS as default.

  - Also by using waitpid it does not allod support the WNOWAIT,
    WEXITED, WSTOPPED, or WCONTINUED flag.  With current POSIX
    specification the flags are no longer marked as optional.

Also due BZ#23091 Hurd still uses the implementation, so it is moved
to as a Hurd arch-specific folder (with some minor cleanups).

Checked against a i686-gnu (run-built-tests=no)

1 files changed, 0 insertions, 158 deletions

diff --git a/sysdeps/posix/waitid.c b/sysdeps/posix/waitid.c
deleted file mode 100644
index f752076735..0000000000
--- a/sysdeps/posix/waitid.c
+++ /dev/null
@@ -1,158 +0,0 @@
-/* Pseudo implementation of waitid.
-   Copyright (C) 1997-2020 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1997.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <https://www.gnu.org/licenses/>.  */
-
-#include <assert.h>
-#include <errno.h>
-#include <signal.h>
-#define __need_NULL
-#include <stddef.h>
-#include <sys/wait.h>
-#include <sys/types.h>
-#include <sysdep-cancel.h>
-
-
-#ifdef DO_WAITID
-# define OUR_WAITID DO_WAITID
-#elif !defined NO_DO_WAITID
-# define OUR_WAITID do_waitid
-#endif
-
-#ifdef OUR_WAITID
-static int
-OUR_WAITID (idtype_t idtype, id_t id, siginfo_t *infop, int options)
-{
-  pid_t pid, child;
-  int status;
-
-  switch (idtype)
-    {
-    case P_PID:
-      if(id <= 0)
-	goto invalid;
-      pid = (pid_t) id;
-      break;
-    case P_PGID:
-      if (id < 0 || id == 1)
-	goto invalid;
-      pid = (pid_t) -id;
-      break;
-    case P_ALL:
-      pid = -1;
-      break;
-    default:
-    invalid:
-      __set_errno (EINVAL);
-      return -1;
-    }
-
-  /* Technically we're supposed to return EFAULT if infop is bogus,
-     but that would involve mucking with signals, which is
-     too much hassle.  User will have to deal with SIGSEGV/SIGBUS.
-     We just check for a null pointer. */
-
-  if (infop == NULL)
-    {
-      __set_errno (EFAULT);
-      return -1;
-    }
-
-  /* This emulation using waitpid cannot support the waitid modes in which
-     we do not reap the child, or match only stopped and not dead children.  */
-  if (0
-#ifdef WNOWAIT
-      || (options & WNOWAIT)
-#endif
-#ifdef WEXITED
-      || ((options & (WEXITED|WSTOPPED|WCONTINUED))
-	  != (WEXITED | (options & WSTOPPED)))
-#endif
-      )
-    {
-      __set_errno (ENOTSUP);
-      return -1;
-    }
-
-  /* Note the waitid() is a cancellation point.  But since we call
-     waitpid() which itself is a cancellation point we do not have
-     to do anything here.  */
-  child = __waitpid (pid, &status,
-		     options
-#ifdef WEXITED
-		     &~ WEXITED
-#endif
-		     );
-
-  if (child == -1)
-    /* `waitpid' set `errno' for us.  */
-    return -1;
-
-  if (child == 0)
-    {
-      /* The WHOHANG bit in OPTIONS is set and there are children available
-	 but none has a status for us.  The XPG docs do not mention this
-	 case so we clear the `siginfo_t' struct and return successfully.  */
-      infop->si_signo = 0;
-      infop->si_code = 0;
-      return 0;
-    }
-
-  /* Decode the status field and set infop members... */
-  infop->si_signo = SIGCHLD;
-  infop->si_pid = child;
-  infop->si_errno = 0;
-
-  if (WIFEXITED (status))
-    {
-      infop->si_code = CLD_EXITED;
-      infop->si_status = WEXITSTATUS (status);
-    }
-  else if (WIFSIGNALED (status))
-    {
-      infop->si_code = WCOREDUMP (status) ? CLD_DUMPED : CLD_KILLED;
-      infop->si_status = WTERMSIG (status);
-    }
-  else if (WIFSTOPPED (status))
-    {
-      infop->si_code = CLD_STOPPED;
-      infop->si_status = WSTOPSIG (status);
-    }
-#ifdef WIFCONTINUED
-  else if (WIFCONTINUED (status))
-    {
-      infop->si_code = CLD_CONTINUED;
-      infop->si_status = SIGCONT;
-    }
-#endif
-  else
-    /* Can't happen. */
-    assert (! "What?");
-
-  return 0;
-}
-#endif
-
-
-int
-__waitid (idtype_t idtype, id_t id, siginfo_t *infop, int options)
-{
-  /* __waitpid should be a cancellation point.  */
-  return do_waitid (idtype, id, infop, options);
-}
-weak_alias (__waitid, waitid)
-strong_alias (__waitid, __libc_waitid)