1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2007 AT&T Knowledge Ventures * 5 * and is licensed under the * 6 * Common Public License, Version 1.0 * 7 * by AT&T Knowledge Ventures * 8 * * 9 * A copy of the License is available at * 10 * http://www.opensource.org/licenses/cpl1.0.txt * 11 * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 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 74 extern Sig_handler_t 75 signal(int sig, Sig_handler_t fun) 76 { 77 struct sigaction na; 78 struct sigaction oa; 79 #ifdef SIGNO_MASK 80 unsigned int flags; 81 #endif 82 83 #ifdef SIGNO_MASK 84 flags = sig & ~SIGNO_MASK; 85 sig &= SIGNO_MASK; 86 #endif 87 if (fun == SIG_DFL) 88 sigunblock(sig); 89 memzero(&na, sizeof(na)); 90 na.sa_handler = fun; 91 #if defined(SA_INTERRUPT) || defined(SA_RESTART) 92 switch (sig) 93 { 94 #if defined(SIGIO) || defined(SIGTSTP) || defined(SIGTTIN) || defined(SIGTTOU) 95 #if defined(SIGIO) 96 case SIGIO: 97 #endif 98 #if defined(SIGTSTP) 99 case SIGTSTP: 100 #endif 101 #if defined(SIGTTIN) 102 case SIGTTIN: 103 #endif 104 #if defined(SIGTTOU) 105 case SIGTTOU: 106 #endif 107 #if defined(SA_RESTART) 108 na.sa_flags = SA_RESTART; 109 #endif 110 break; 111 #endif 112 default: 113 #if defined(SA_INTERRUPT) 114 na.sa_flags = SA_INTERRUPT; 115 #endif 116 break; 117 } 118 #endif 119 return(sigaction(sig, &na, &oa) ? (Sig_handler_t)0 : oa.sa_handler); 120 } 121 122 #else 123 124 NoN(signal) 125 126 #endif 127