Remove sigvec.

1 files changed, 176 insertions, 10 deletions

diff --git a/signal/sigvec.c b/signal/sigvec.c
index e3ffb281a8..d4921536e9 100644
--- a/signal/sigvec.c
+++ b/signal/sigvec.c
@@ -1,4 +1,5 @@
-/* Copyright (C) 1991-2014 Free Software Foundation, Inc.
+/* ABI compatibility for obsolete sigvec function from 4.2BSD.
+   Copyright (C) 1991-2014 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
@@ -15,8 +16,47 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#include <signal.h>
-#include <errno.h>
+#include <shlib-compat.h>
+
+#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_21)
+
+# include <signal.h>
+# include <errno.h>
+# include <stddef.h>
+
+
+/* These are the struct sigvec and SV_* bit definitions that
+   used to be in <signal.h>.  The whole interface now exists
+   solely for ABI compatibility, so it can just be here.  */
+struct sigvec
+  {
+    __sighandler_t sv_handler;	/* Signal handler.  */
+    int sv_mask;		/* Mask of signals to be blocked.  */
+
+    int sv_flags;		/* Flags (see below).  */
+  };
+# define SV_ONSTACK	(1 << 0)/* Take the signal on the signal stack.  */
+# define SV_INTERRUPT	(1 << 1)/* Do not restart system calls.  */
+# define SV_RESETHAND	(1 << 2)/* Reset handler to SIG_DFL on receipt.  */
+
+
+/* Include macros to convert between `sigset_t' and old-style mask. */
+# include <sigset-cvt-mask.h>
+
+# ifndef SA_RESETHAND
+/* When sigaction lacks the extension bit for it,
+   we use a wrapper handler to support SV_RESETHAND.  */
+struct sigvec_wrapper_data
+{
+  __sighandler_t sw_handler;
+  unsigned int sw_mask;
+};
+
+static void sigvec_wrapper_handler (int sig) __THROW;
+
+static struct sigvec_wrapper_data sigvec_wrapper_data[NSIG];
+# endif
+
 
 /* If VEC is non-NULL, set the handler for SIG to the `sv_handler' member
    of VEC.  The signals in `sv_mask' will be blocked while the handler runs.
@@ -24,14 +64,140 @@
    reset to SIG_DFL before `sv_handler' is entered.  If OVEC is non-NULL,
    it is filled in with the old information for SIG.  */
 int
-__sigvec (sig, vec, ovec)
+__sigvec (int sig,
+          const struct sigvec *vec,
+          struct sigvec *ovec)
+{
+  struct sigaction old;
+
+# ifndef SA_RESETHAND
+  if (vec == NULL || !(vec->sv_flags & SV_RESETHAND))
+# endif
+    {
+      struct sigaction new, *n;
+
+      if (vec == NULL)
+	n = NULL;
+      else
+	{
+	  __sighandler_t handler;
+	  unsigned int mask;
+	  unsigned int sv_flags;
+	  unsigned int sa_flags;
+
+	  handler = vec->sv_handler;
+	  mask = vec->sv_mask;
+	  sv_flags = vec->sv_flags;
+	  sa_flags = 0;
+	  if (sv_flags & SV_ONSTACK)
+	    {
+# ifdef SA_ONSTACK
+	      sa_flags |= SA_ONSTACK;
+# else
+	      __set_errno (ENOSYS);
+	      return -1;
+# endif
+	    }
+# ifdef SA_RESTART
+	  if (!(sv_flags & SV_INTERRUPT))
+	    sa_flags |= SA_RESTART;
+# endif
+# ifdef SA_RESETHAND
+	  if (sv_flags & SV_RESETHAND)
+	    sa_flags |= SA_RESETHAND;
+# endif
+	  n = &new;
+	  new.sa_handler = handler;
+	  if (sigset_set_old_mask (&new.sa_mask, mask) < 0)
+	    return -1;
+	  new.sa_flags = sa_flags;
+	}
+
+      if (__sigaction (sig, n, &old) < 0)
+	return -1;
+    }
+# ifndef SA_RESETHAND
+  else
+    {
+      __sighandler_t handler;
+      unsigned int mask;
+      struct sigvec_wrapper_data *data;
+      struct sigaction wrapper;
+
+      handler = vec->sv_handler;
+      mask = (unsigned int)vec->sv_mask;
+      data = &sigvec_wrapper_data[sig];
+      wrapper.sa_handler = sigvec_wrapper_handler;
+      /* FIXME: should we set wrapper.sa_mask, wrapper.sa_flags??  */
+      data->sw_handler = handler;
+      data->sw_mask = mask;
+
+      if (__sigaction (sig, &wrapper, &old) < 0)
+	return -1;
+    }
+# endif
+
+  if (ovec != NULL)
+    {
+      __sighandler_t handler;
+      unsigned int sv_flags;
+      unsigned int sa_flags;
+      unsigned int mask;
+
+      handler = old.sa_handler;
+      sv_flags = 0;
+      sa_flags = old.sa_flags;
+# ifndef SA_RESETHAND
+      if (handler == sigvec_wrapper_handler)
+	{
+	  handler = sigvec_wrapper_data[sig].sw_handler;
+	  /* should we use data->sw_mask?? */
+	  sv_flags |= SV_RESETHAND;
+	}
+# else
+     if (sa_flags & SA_RESETHAND)
+	sv_flags |= SV_RESETHAND;
+# endif
+      mask = sigset_get_old_mask (&old.sa_mask);
+# ifdef SA_ONSTACK
+     if (sa_flags & SA_ONSTACK)
+	sv_flags |= SV_ONSTACK;
+# endif
+# ifdef SA_RESTART
+     if (!(sa_flags & SA_RESTART))
+# endif
+	sv_flags |= SV_INTERRUPT;
+      ovec->sv_handler = handler;
+      ovec->sv_mask = (int)mask;
+      ovec->sv_flags = (int)sv_flags;
+    }
+
+  return 0;
+}
+
+compat_symbol (libc, __sigvec, sigvec, GLIBC_2_0);
+
+# ifndef SA_RESETHAND
+static void
+sigvec_wrapper_handler (sig)
      int sig;
-     const struct sigvec *vec;
-     struct sigvec *ovec;
 {
-  __set_errno (ENOSYS);
-  return -1;
+  struct sigvec_wrapper_data *data;
+  struct sigaction act;
+  int save;
+  __sighandler_t handler;
+
+  data = &sigvec_wrapper_data[sig];
+  act.sa_handler = SIG_DFL;
+  act.sa_flags = 0;
+  sigset_set_old_mask (&act.sa_mask, data->sw_mask);
+  handler = data->sw_handler;
+  save = errno;
+  (void) __sigaction (sig, &act, (struct sigaction *) NULL);
+  __set_errno (save);
+
+  (*handler) (sig);
 }
-stub_warning (sigvec)
+# endif  /* No SA_RESETHAND.  */
 
-weak_alias (__sigvec, sigvec)
+#endif  /* SHLIB_COMPAT */