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Diffstat (limited to 'src/lib/libast/comp/sigunblock.c')
| -rw-r--r-- | src/lib/libast/comp/sigunblock.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/src/lib/libast/comp/sigunblock.c b/src/lib/libast/comp/sigunblock.c new file mode 100644 index 0000000..dfcb28b --- /dev/null +++ b/src/lib/libast/comp/sigunblock.c @@ -0,0 +1,63 @@ +/*********************************************************************** +* * +* This software is part of the ast package * +* Copyright (c) 1985-2011 AT&T Intellectual Property * +* and is licensed under the * +* Eclipse Public License, Version 1.0 * +* by AT&T Intellectual Property * +* * +* A copy of the License is available at * +* http://www.eclipse.org/org/documents/epl-v10.html * +* (with md5 checksum b35adb5213ca9657e911e9befb180842) * +* * +* Information and Software Systems Research * +* AT&T Research * +* Florham Park NJ * +* * +* Glenn Fowler <gsf@research.att.com> * +* David Korn <dgk@research.att.com> * +* Phong Vo <kpv@research.att.com> * +* * +***********************************************************************/ +#pragma prototyped + +#include <ast.h> + +#if _lib_sigunblock + +NoN(sigunblock) + +#else + +#include <sig.h> + +#ifndef SIG_UNBLOCK +#undef _lib_sigprocmask +#endif + +int +sigunblock(int s) +{ +#if _lib_sigprocmask + int op; + sigset_t mask; + + sigemptyset(&mask); + if (s) + { + sigaddset(&mask, s); + op = SIG_UNBLOCK; + } + else op = SIG_SETMASK; + return(sigprocmask(op, &mask, NiL)); +#else +#if _lib_sigsetmask + return(sigsetmask(s ? (sigsetmask(0L) & ~sigmask(s)) : 0L)); +#else + NoP(s); + return(0); +#endif +#endif +} + +#endif |