1 /* 2 * Copyright (c) 1998-2001 Sendmail, Inc. and its suppliers. 3 * All rights reserved. 4 * Copyright (c) 1983, 1995-1997 Eric P. Allman. All rights reserved. 5 * Copyright (c) 1988, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * By using this file, you agree to the terms and conditions set 9 * forth in the LICENSE file which can be found at the top level of 10 * the sendmail distribution. 11 * 12 * $Id: signal.h,v 1.16 2001/07/20 19:48:21 gshapiro Exp $ 13 */ 14 15 /* 16 ** SIGNAL.H -- libsm (and sendmail) signal facilities 17 ** Extracted from sendmail/conf.h and focusing 18 ** on signal configuration. 19 */ 20 21 #ifndef SM_SIGNAL_H 22 #define SM_SIGNAL_H 1 23 24 #include <sys/types.h> 25 #include <limits.h> 26 #include <signal.h> 27 #include <sm/cdefs.h> 28 #include <sm/conf.h> 29 30 /* 31 ** Critical signal sections 32 */ 33 34 #define PEND_SIGHUP 0x0001 35 #define PEND_SIGINT 0x0002 36 #define PEND_SIGTERM 0x0004 37 #define PEND_SIGUSR1 0x0008 38 39 #define ENTER_CRITICAL() InCriticalSection++ 40 41 #define LEAVE_CRITICAL() \ 42 do \ 43 { \ 44 if (InCriticalSection > 0) \ 45 InCriticalSection--; \ 46 } while (0) 47 48 #define CHECK_CRITICAL(sig) \ 49 do \ 50 { \ 51 if (InCriticalSection > 0 && (sig) != 0) \ 52 { \ 53 pend_signal((sig)); \ 54 return SIGFUNC_RETURN; \ 55 } \ 56 } while (0) 57 58 /* variables */ 59 extern unsigned int volatile InCriticalSection; /* >0 if in critical section */ 60 extern int volatile PendingSignal; /* pending signal to resend */ 61 62 /* functions */ 63 extern void pend_signal __P((int)); 64 65 /* reset signal in case System V semantics */ 66 #ifdef SYS5SIGNALS 67 # define FIX_SYSV_SIGNAL(sig, handler) \ 68 { \ 69 if ((sig) != 0) \ 70 (void) sm_signal((sig), (handler)); \ 71 } 72 #else /* SYS5SIGNALS */ 73 # define FIX_SYSV_SIGNAL(sig, handler) { /* EMPTY */ } 74 #endif /* SYS5SIGNALS */ 75 76 extern void sm_allsignals __P((bool)); 77 extern int sm_blocksignal __P((int)); 78 extern int sm_releasesignal __P((int)); 79 extern sigfunc_t sm_signal __P((int, sigfunc_t)); 80 extern SIGFUNC_DECL sm_signal_noop __P((int)); 81 #endif /* SM_SIGNAL_H */ 82