usr/src/sys/tahoe/signal.h

/*
 * Copyright (c) 1982, 1986, 1989 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *      %W% (Berkeley) %G%
 */

#ifndef NSIG
#define NSIG    32              /* counting 0; could be 33 (mask is 1-32) */

#ifndef _POSIX_SOURCE
#ifdef KERNEL
#include "machine/trap.h"       /* codes for SIGILL, SIGFPE */
#else
#include <machine/trap.h>       /* codes for SIGILL, SIGFPE */
#endif
#endif /* _POSIX_SOURCE */

#define SIGHUP  1       /* hangup */
#define SIGINT  2       /* interrupt */
#define SIGQUIT 3       /* quit */
#define SIGILL  4       /* illegal instruction (not reset when caught) */
#ifndef _POSIX_SOURCE
#define SIGTRAP 5       /* trace trap (not reset when caught) */
#endif
#define SIGABRT 6       /* abort() */
#ifndef _POSIX_SOURCE
#define SIGIOT  SIGABRT /* compatibility */
#define SIGEMT  7       /* EMT instruction */
#endif
#define SIGFPE  8       /* floating point exception */
#define SIGKILL 9       /* kill (cannot be caught or ignored) */
#ifndef _POSIX_SOURCE
#define SIGBUS  10      /* bus error */
#endif
#define SIGSEGV 11      /* segmentation violation */
#ifndef _POSIX_SOURCE
#define SIGSYS  12      /* bad argument to system call */
#endif
#define SIGPIPE 13      /* write on a pipe with no one to read it */
#define SIGALRM 14      /* alarm clock */
#define SIGTERM 15      /* software termination signal from kill */
#ifndef _POSIX_SOURCE
#define SIGURG  16      /* urgent condition on IO channel */
#endif
#define SIGSTOP 17      /* sendable stop signal not from tty */
#define SIGTSTP 18      /* stop signal from tty */
#define SIGCONT 19      /* continue a stopped process */
#define SIGCHLD 20      /* to parent on child stop or exit */
#define SIGTTIN 21      /* to readers pgrp upon background tty read */
#define SIGTTOU 22      /* like TTIN for output if (tp->t_local&LTOSTOP) */
#ifndef _POSIX_SOURCE
#define SIGIO   23      /* input/output possible signal */
#define SIGXCPU 24      /* exceeded CPU time limit */
#define SIGXFSZ 25      /* exceeded file size limit */
#define SIGVTALRM 26    /* virtual time alarm */
#define SIGPROF 27      /* profiling time alarm */
#define SIGWINCH 28     /* window size changes */
#define SIGINFO 29      /* information request */
#endif
#define SIGUSR1 30      /* user defined signal 1 */
#define SIGUSR2 31      /* user defined signal 2 */

#ifndef _POSIX_SOURCE
typedef void (*sig_t)();
#endif  /* _POSIX_SOURCE */
#ifndef KERNEL
void    (*signal())();
#endif /* KERNEL */

typedef unsigned int sigset_t;

#define sigemptyset(set)        ( *(set) = 0 )
#define sigfillset(set)         ( *(set) = ~(sigset_t)0 )
#define sigaddset(set, signo)   ( *(set) |= 1 << ((signo) - 1), 0)
#define sigdelset(set, signo)   ( *(set) &= ~(1 << ((signo) - 1)), 0)
#define sigismember(set, signo) ( (*(set) & (1 << ((signo) - 1))) != 0)

/*
 * Signal vector "template" used in sigaction call.
 */
struct  sigaction {
        void    (*sa_handler)();        /* signal handler */
        sigset_t sa_mask;               /* signal mask to apply */
        int     sa_flags;               /* see signal options below */
};
#ifndef _POSIX_SOURCE
#define SA_ONSTACK      0x0001  /* take signal on signal stack */
#define SA_RESTART      0x0002  /* do not restart system on signal return */
#endif  /* _POSIX_SOURCE */
#define SA_NOCLDSTOP    0x0004  /* do not generate SIGCHLD on child stop */

/*
 * Flags for sigprocmask:
 */
#define SIG_BLOCK       1       /* block specified signal set */
#define SIG_UNBLOCK     2       /* unblock specified signal set */
#define SIG_SETMASK     3       /* set specified signal set */

#ifndef _POSIX_SOURCE
/*
 * 4.3 compatibility:
 * Signal vector "template" used in sigvec call.
 */
struct  sigvec {
        void    (*sv_handler)();        /* signal handler */
        int     sv_mask;                /* signal mask to apply */
        int     sv_flags;               /* see signal options below */
};
#define SV_ONSTACK      SA_ONSTACK
#define SV_INTERRUPT    SA_RESTART      /* same bit, opposite sense */
#define sv_onstack sv_flags     /* isn't compatibility wonderful! */

/*
 * Structure used in sigstack call.
 */
struct  sigstack {
        char    *ss_sp;                 /* signal stack pointer */
        int     ss_onstack;             /* current status */
};

/*
 * Information pushed on stack when a signal is delivered.
 * This is used by the kernel to restore state following
 * execution of the signal handler.  It is also made available
 * to the handler to allow it to restore state properly if
 * a non-standard exit is performed.
 */
struct  sigcontext {
        int     sc_onstack;             /* sigstack state to restore */
        int     sc_mask;                /* signal mask to restore */
        int     sc_sp;                  /* sp to restore */
        int     sc_fp;                  /* fp to restore */
        int     sc_ap;                  /* ap to restore */
        int     sc_pc;                  /* pc to restore */
        int     sc_ps;                  /* psl to restore */
};

/*
 * Macro for converting signal number to a mask suitable for
 * sigblock().
 */
#define sigmask(m)      (1 << ((m)-1))

#define BADSIG          (void (*)())-1
#endif  /* _POSIX_SOURCE */

#define SIG_DFL         (void (*)())0
#define SIG_IGN         (void (*)())1

#ifdef KERNEL
#define SIG_CATCH       (void (*)())2
#define SIG_HOLD        (void (*)())3

#define sigcantmask     (sigmask(SIGKILL)|sigmask(SIGSTOP))
/*
 * get signal action for process and signal; currently only for current process
 */
#define SIGACTION(p, sig)       (u.u_signal[(sig)])

/*
 * Determine signal that should be delivered to process,
 * 0 if none.
 */
#define CURSIG(p) \
        (((p)->p_sig == 0 || \
            ((p)->p_flag&STRC) == 0 && ((p)->p_sig &~ (p)->p_sigmask) == 0) ? \
            0 : issig())

#endif
#endif