bin/ksh/sigact.h

   1 /*      $NetBSD: sigact.h,v 1.3 2002/05/25 23:29:17 wiz Exp $   */
   2
   3 /* NAME:
   4  *      sigact.h - sigaction et al
   5  *
   6  * SYNOPSIS:
   7  *      #include "sigact.h"
   8  *
   9  * DESCRIPTION:
  10  *      This header is the interface to a fake sigaction(2)
  11  *      implementation. It provides a POSIX compliant interface
  12  *      to whatever signal handling mechanisms are available.
  13  *      It also provides a Signal() function that is implemented
  14  *      in terms of sigaction().
  15  *      If not using signal(2) as part of the underlying
  16  *      implementation (USE_SIGNAL or USE_SIGMASK), and
  17  *      NO_SIGNAL is not defined, it also provides a signal()
  18  *      function that calls Signal().
  19  *
  20  * SEE ALSO:
  21  *      sigact.c
  22  */
  23 /*
  24  * RCSid:
  25  *      $NetBSD: sigact.h,v 1.3 2002/05/25 23:29:17 wiz Exp $
  26  */
  27 /* Changes to sigact.h for pdksh, Michael Rendell <michael@cs.mun.ca>:
  28  *      - changed SIG_HDLR to RETSIGTYPE for use with GNU autoconf
  29  *      - added RETSIGVAL
  30  *      - ifdef'd out ARGS(), volatile and const initializations
  31  *      - ifdef'd out sigset_t definition - let autoconf handle it
  32  *      - ifdef out routines not used in ksh if IS_KSH is defined
  33  *        (same in sigact.c).
  34  */
  35 #ifndef _SIGACT_H
  36 #define _SIGACT_H
  37
  38 /*
  39  * most modern systems use void for signal handlers but
  40  * not all.
  41  */
  42 #ifndef RETSIGTYPE
  43 # define RETSIGTYPE void
  44 # define RETSIGVAL
  45 #endif
  46
  47 #if 0 /* ARGS(), volatile and const are already set up in config*.h -mhr */
  48 #undef ARGS
  49 #define ARGS(p) p
  50 #endif
  51
  52 #ifndef IS_KSH
  53 handler_t Signal        ARGS((int sig, handler_t disp));
  54 #endif /* IS_KSH */
  55
  56 /*
  57  * if you want to install this header as signal.h,
  58  * modify this to pick up the original signal.h
  59  */
  60 #ifndef SIGKILL
  61 # include <signal.h>
  62 #endif
  63
  64 #ifndef SIG_ERR
  65 # define SIG_ERR  ((handler_t) -1)
  66 #endif
  67 #ifndef BADSIG
  68 # define BADSIG  SIG_ERR
  69 #endif
  70
  71 #ifndef SA_NOCLDSTOP
  72 /* we assume we need the fake sigaction */
  73 /* sa_flags */
  74 #define SA_NOCLDSTOP    1               /* don't send SIGCHLD on child stop */
  75 #define SA_RESTART      2               /* re-start I/O */
  76
  77 /* sigprocmask flags */
  78 #define SIG_BLOCK       1
  79 #define SIG_UNBLOCK     2
  80 #define SIG_SETMASK     4
  81
  82 #if 0 /* autoconf will define sigset_t if it isn't available */
  83 /*
  84  * this is a bit untidy
  85  */
  86 #if !defined(__sys_stdtypes_h)
  87 typedef unsigned int sigset_t;
  88 #endif
  89 #endif /* 0 */
  90
  91 /*
  92  * POSIX sa_handler should return void, but since we are
  93  * implementing in terms of something else, it may
  94  * be appropriate to use the normal RETSIGTYPE return type
  95  */
  96 struct sigaction
  97 {
  98   handler_t     sa_handler;
  99   sigset_t      sa_mask;
 100   int           sa_flags;
 101 };
 102
 103
 104 int     sigaction       ARGS(( int sig, struct sigaction *act, struct sigaction *oact ));
 105 int     sigaddset       ARGS(( sigset_t *mask, int sig ));
 106 #ifndef IS_KSH
 107 int     sigdelset       ARGS(( sigset_t *mask, int sig ));
 108 #endif /* IS_KSH */
 109 int     sigemptyset     ARGS(( sigset_t *mask ));
 110 #ifndef IS_KSH
 111 int     sigfillset      ARGS(( sigset_t *mask ));
 112 int     sigismember     ARGS(( sigset_t *mask, int sig ));
 113 int     sigpending      ARGS(( sigset_t *set ));
 114 #endif /* IS_KSH */
 115 int     sigprocmask     ARGS(( int how, sigset_t *set, sigset_t *oset ));
 116 int     sigsuspend      ARGS(( sigset_t *mask ));
 117
 118 #ifndef sigmask
 119 # define sigmask(s)     (1<<((s)-1))    /* convert SIGnum to mask */
 120 #endif
 121 #if !defined(NSIG) && defined(_NSIG)
 122 # define NSIG _NSIG
 123 #endif
 124 #endif /* ! SA_NOCLDSTOP */
 125 #endif /* _SIGACT_H */