1/*********************************************************************** 2* * 3* This software is part of the ast package * 4* Copyright (c) 1985-2011 AT&T Intellectual Property * 5* and is licensed under the * 6* Eclipse Public License, Version 1.0 * 7* by AT&T Intellectual Property * 8* * 9* A copy of the License is available at * 10* http://www.eclipse.org/org/documents/epl-v10.html * 11* (with md5 checksum b35adb5213ca9657e911e9befb180842) * 12* * 13* Information and Software Systems Research * 14* AT&T Research * 15* Florham Park NJ * 16* * 17* Glenn Fowler <gsf@research.att.com> * 18* David Korn <dgk@research.att.com> * 19* Phong Vo <kpv@research.att.com> * 20* * 21***********************************************************************/ 22#pragma prototyped 23 24/* 25 * signal that disables syscall restart on interrupt with clear signal mask 26 * fun==SIG_DFL also unblocks signal 27 */ 28 29#if !_UWIN 30 31#undef signal 32#define signal ______signal 33 34#endif 35 36#include <ast.h> 37#include <sig.h> 38 39#if !_UWIN 40 41#undef signal 42 43#undef _def_map_ast 44#include <ast_map.h> 45 46#if defined(__EXPORT__) 47#define extern __EXPORT__ 48#endif 49 50#endif 51 52#if defined(SV_ABORT) 53#undef SV_INTERRUPT 54#define SV_INTERRUPT SV_ABORT 55#endif 56 57#if !_std_signal && (_lib_sigaction && defined(SA_NOCLDSTOP) || _lib_sigvec && defined(SV_INTERRUPT)) 58 59#if !defined(SA_NOCLDSTOP) || !defined(SA_INTERRUPT) && defined(SV_INTERRUPT) 60#undef SA_INTERRUPT 61#define SA_INTERRUPT SV_INTERRUPT 62#undef sigaction 63#define sigaction sigvec 64#undef sigemptyset 65#define sigemptyset(p) (*(p)=0) 66#undef sa_flags 67#define sa_flags sv_flags 68#undef sa_handler 69#define sa_handler sv_handler 70#undef sa_mask 71#define sa_mask sv_mask 72#endif 73 74extern Sig_handler_t 75signal(int sig, Sig_handler_t fun) 76{ 77 struct sigaction na; 78 struct sigaction oa; 79 int unblock; 80#ifdef SIGNO_MASK 81 unsigned int flags; 82#endif 83 84 if (sig < 0) 85 { 86 sig = -sig; 87 unblock = 0; 88 } 89 else 90 unblock = fun == SIG_DFL; 91#ifdef SIGNO_MASK 92 flags = sig & ~SIGNO_MASK; 93 sig &= SIGNO_MASK; 94#endif 95 memzero(&na, sizeof(na)); 96 na.sa_handler = fun; 97#if defined(SA_INTERRUPT) || defined(SA_RESTART) 98 switch (sig) 99 { 100#if defined(SIGIO) || defined(SIGTSTP) || defined(SIGTTIN) || defined(SIGTTOU) 101#if defined(SIGIO) 102 case SIGIO: 103#endif 104#if defined(SIGTSTP) 105 case SIGTSTP: 106#endif 107#if defined(SIGTTIN) 108 case SIGTTIN: 109#endif 110#if defined(SIGTTOU) 111 case SIGTTOU: 112#endif 113#if defined(SA_RESTART) 114 na.sa_flags = SA_RESTART; 115#endif 116 break; 117#endif 118 default: 119#if defined(SA_INTERRUPT) 120 na.sa_flags = SA_INTERRUPT; 121#endif 122 break; 123 } 124#endif 125 if (sigaction(sig, &na, &oa)) 126 return 0; 127 if (unblock) 128 sigunblock(sig); 129 return oa.sa_handler; 130} 131 132#else 133 134NoN(signal) 135 136#endif 137