gnu/abc-shell/sigact.h

   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  *      $Id$
  24  */
  25 /* Changes to sigact.h for pdksh, Michael Rendell <michael@cs.mun.ca>:
  26  *      - changed SIG_HDLR to void for use with GNU autoconf
  27  *      - ifdef'd out ARGS(), volatile and const initializations
  28  *      - ifdef'd out sigset_t definition - let autoconf handle it
  29  *      - ifdef out routines not used in ksh if IS_KSH is defined
  30  *        (same in sigact.c).
  31  */
  32 #ifndef _SIGACT_H
  33 #define _SIGACT_H
  34
  35 /*
  36  * if you want to install this header as signal.h,
  37  * modify this to pick up the original signal.h
  38  */
  39 #ifndef SIGKILL
  40 # include <signal.h>
  41 #endif
  42
  43 #ifdef __amigaos4__
  44 # include <signal.h>
  45 #endif
  46
  47 #ifndef SIG_ERR
  48 # define SIG_ERR  ((handler_t) -1)
  49 #endif
  50 #ifndef BADSIG
  51 # define BADSIG  SIG_ERR
  52 #endif
  53
  54 #ifndef SA_NOCLDSTOP
  55 /* we assume we need the fake sigaction */
  56 /* sa_flags */
  57 #define SA_NOCLDSTOP    1               /* don't send SIGCHLD on child stop */
  58 #define SA_RESTART      2               /* re-start I/O */
  59
  60 /* sigprocmask flags */
  61 #ifdef AMIGA                            /* AmigaOS4 changes by Thomas Frieden */
  62 #undef SIG_BLOCK
  63 #undef SIG_UNBLOCK
  64 #undef SIG_SETMASK
  65 #endif
  66
  67 #define SIG_BLOCK       1
  68 #define SIG_UNBLOCK     2
  69 #define SIG_SETMASK     4
  70
  71 #if !defined(__sys_stdtypes_h) && !defined(CLIB2)
  72 typedef unsigned int sigset_t;
  73 #endif
  74
  75 /*
  76  * POSIX sa_handler should return void, but since we are
  77  * implementing in terms of something else, it may
  78  * be appropriate to use the normal void return type
  79  */
  80 struct sigaction
  81 {
  82   handler_t     sa_handler;
  83   sigset_t      sa_mask;
  84   int           sa_flags;
  85 };
  86
  87 #if !defined(__AROS__)
  88 int     sigaction(int, struct sigaction *, struct sigaction *);
  89 #endif
  90 int     sigaddset(sigset_t *, int);
  91 int     sigemptyset(sigset_t *);
  92 #ifndef CLIB2
  93 #ifdef AMIGA            /* AmigaOS4 changes by Thomas Frieden */
  94 int     sigprocmask(int, const sigset_t *, sigset_t *);
  95 #else
  96 int     sigprocmask(int, sigset_t *, sigset_t *);
  97 #endif
  98 #endif
  99 int     sigsuspend(sigset_t *);
 100
 101 #ifndef sigmask
 102 # define sigmask(s)     (1<<((s)-1))    /* convert SIGnum to mask */
 103 #endif
 104 #if !defined(NSIG) && defined(_NSIG)
 105 # define NSIG _NSIG
 106 #endif
 107 #endif /* ! SA_NOCLDSTOP */
 108 #endif /* _SIGACT_H */