1 /* NAME: 2 * sigact.h - sigaction et al 3 * 4 * SYNOPSIS: 5 * #include "sigact.h" 6 * 7 * DESCRIPTION: 8 * This header is the interface to a fake sigaction(2) 9 * implementation. It provides a POSIX compliant interface 10 * to whatever signal handling mechanisms are available. 11 * It also provides a Signal() function that is implemented 12 * in terms of sigaction(). 13 * If not using signal(2) as part of the underlying 14 * implementation (USE_SIGNAL or USE_SIGMASK), and 15 * NO_SIGNAL is not defined, it also provides a signal() 16 * function that calls Signal(). 17 * 18 * SEE ALSO: 19 * sigact.c 20 */ 21 /* 22 * RCSid: 23 * $Id: sigact.h,v 1.4 2021/10/14 19:39:17 sjg Exp $ 24 */ 25 #ifndef _SIGACT_H 26 #define _SIGACT_H 27 28 #include <sys/cdefs.h> 29 30 /* 31 * most modern systems use void for signal handlers but 32 * not all. 33 */ 34 #ifndef SIG_HDLR 35 # define SIG_HDLR void 36 #endif 37 38 /* 39 * if you want to install this header as signal.h, 40 * modify this to pick up the original signal.h 41 */ 42 #ifndef SIGKILL 43 # include <signal.h> 44 #endif 45 #ifndef SIGKILL 46 # include <sys/signal.h> 47 #endif 48 49 #ifndef SIG_ERR 50 # define SIG_ERR (SIG_HDLR (*)())-1 51 #endif 52 #ifndef BADSIG 53 # define BADSIG SIG_ERR 54 #endif 55 56 #ifndef SA_NOCLDSTOP 57 /* we assume we need the fake sigaction */ 58 /* sa_flags */ 59 #define SA_NOCLDSTOP 1 /* don't send SIGCHLD on child stop */ 60 #define SA_RESTART 2 /* re-start I/O */ 61 62 /* sigprocmask flags */ 63 #define SIG_BLOCK 1 64 #define SIG_UNBLOCK 2 65 #define SIG_SETMASK 4 66 67 /* 68 * this is a bit untidy 69 */ 70 #ifdef _SIGSET_T_ 71 typedef _SIGSET_T_ sigset_t; 72 #endif 73 74 /* 75 * POSIX sa_handler should return void, but since we are 76 * implementing in terms of something else, it may 77 * be appropriate to use the normal SIG_HDLR return type 78 */ 79 struct sigaction 80 { 81 SIG_HDLR (*sa_handler)(); 82 sigset_t sa_mask; 83 int sa_flags; 84 }; 85 86 87 int sigaction ( int /*sig*/, const struct sigaction */*act*/, struct sigaction */*oact*/ ); 88 int sigaddset ( sigset_t */*mask*/, int /*sig*/ ); 89 int sigdelset ( sigset_t */*mask*/, int /*sig*/ ); 90 int sigemptyset ( sigset_t */*mask*/ ); 91 int sigfillset ( sigset_t */*mask*/ ); 92 int sigismember ( const sigset_t */*mask*/, int /*sig*/ ); 93 int sigpending ( sigset_t */*set*/ ); 94 int sigprocmask ( int how, const sigset_t */*set*/, sigset_t */*oset*/ ); 95 int sigsuspend ( sigset_t */*mask*/ ); 96 97 #ifndef sigmask 98 # define sigmask(s) (1<<((s)-1) & (32 - 1)) /* convert SIGnum to mask */ 99 #endif 100 #if !defined(NSIG) && defined(_NSIG) 101 # define NSIG _NSIG 102 #endif 103 #endif /* ! SA_NOCLDSTOP */ 104 #endif /* _SIGACT_H */ 105