1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2008 AT&T Intellectual Property * 5 * and is licensed under the * 6 * Common Public License, Version 1.0 * 7 * by AT&T Intellectual Property * 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 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 133 134 NoN(signal) 135 136 #endif 137