update from main archive 960105 cvs/libc-970107 cvs/libc-970106

1 files changed, 89 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/sigset.h b/sysdeps/unix/sysv/linux/sigset.h
new file mode 100644
index 0000000000..69648b7e9c
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/sigset.h
@@ -0,0 +1,89 @@
+/* __sig_atomic_t, __sigset_t, and related definitions.  Linux version.
+   Copyright (C) 1991, 1992, 1994, 1996, 1997 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
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#ifndef	_SIGSET_H_types
+#define	_SIGSET_H_types	1
+
+typedef int __sig_atomic_t;
+
+/* A `sigset_t' has a bit for each signal.  Having 32 * 4 * 8 bits gives
+   us up to 1024 signals.  */
+#define _SIGSET_NWORDS	32
+typedef struct
+{
+  unsigned int __val[_SIGSET_NWORDS];
+} __sigset_t;
+
+#endif
+
+
+/* We only want to define these functions if <signal.h> was actually
+   included; otherwise we were included just to define the types.  Since we
+   are namespace-clean, it wouldn't hurt to define extra macros.  But
+   trouble can be caused by functions being defined (e.g., any global
+   register vars declared later will cause compilation errors).  */
+
+#if !defined (_SIGSET_H_fns) && defined (_SIGNAL_H)
+#define _SIGSET_H_fns 1
+
+#ifndef _EXTERN_INLINE
+#define _EXTERN_INLINE extern __inline
+#endif
+
+/* Return a mask that includes the bit for SIG only.  */
+#define	__sigmask(sig)	(((unsigned int) 1) << (((sig) - 1) \
+						% (8 * sizeof (unsigned int))))
+/* Return the word index for SIG.  */
+#define __sigword(sig)	(((sig) - 1) / (8 * sizeof (unsigned int)))
+
+#if defined __GNUC__ && __GNUC__ >= 2
+#define __sigemptyset(set) \
+  (__extension__ ({ unsigned int __cnt;					      \
+		    for (__cnt = 0; __cnt < _SIGSET_NWORDS; ++__cnt)	      \
+		      (set)->__val[__cnt] = 0; 0; }))
+#define __sigfillset(set) \
+  (__extension__ ({ unsigned int __cnt;					      \
+		    for (__cnt = 0; __cnt < _SIGSET_NWORDS; ++__cnt)	      \
+		      (set)->__val[__cnt] = ~0; 0; }))
+#endif
+
+/* These functions needn't check for a bogus signal number -- error
+   checking is done in the non __ versions.  */
+
+extern int __sigismember (__const __sigset_t *, int);
+extern int __sigaddset (__sigset_t *, int);
+extern int __sigdelset (__sigset_t *, int);
+
+#define __SIGSETFN(NAME, BODY, CONST)					      \
+  _EXTERN_INLINE int							      \
+  NAME (CONST __sigset_t *__set, int __sig)				      \
+  {									      \
+    unsigned int __mask = __sigmask (__sig);				      \
+    unsigned int __word = __sigword (__sig);				      \
+    return BODY;							      \
+  }
+
+__SIGSETFN (__sigismember, (__set->__val[__word] & __mask) ? 1 : 0, __const)
+__SIGSETFN (__sigaddset, ((__set->__val[__word] |= __mask), 0), )
+__SIGSETFN (__sigdelset, ((__set->__val[__word] &= ~__mask), 0), )
+
+#undef __SIGSETFN
+
+
+#endif /* ! _SIGSET_H_fns.  */