source: trunk/minix/include/signal.h@ 20

/* The <signal.h> header defines all the ANSI and POSIX signals.
 * MINIX supports all the signals required by POSIX. They are defined below.
 * Some additional signals are also supported.
 */

#ifndef _SIGNAL_H
#define _SIGNAL_H

#ifndef _ANSI_H
#include <ansi.h>
#endif
#ifdef _POSIX_SOURCE
#ifndef _TYPES_H
#include <sys/types.h>
#endif
#endif

/* Here are types that are closely associated with signal handling. */
typedef int sig_atomic_t;

#ifdef _POSIX_SOURCE
#ifndef _SIGSET_T
#define _SIGSET_T
typedef unsigned long sigset_t;
#endif
#endif

/* Regular signals. */
#define SIGHUP             1    /* hangup */
#define SIGINT             2    /* interrupt (DEL) */
#define SIGQUIT            3    /* quit (ASCII FS) */
#define SIGILL             4    /* illegal instruction */
#define SIGTRAP            5    /* trace trap (not reset when caught) */
#define SIGABRT            6    /* IOT instruction */
#define SIGBUS             7    /* bus error */
#define SIGFPE             8    /* floating point exception */
#define SIGKILL            9    /* kill (cannot be caught or ignored) */
#define SIGUSR1           10    /* user defined signal # 1 */
#define SIGSEGV           11    /* segmentation violation */
#define SIGUSR2           12    /* user defined signal # 2 */
#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 */
#define SIGEMT            16    /* EMT instruction */
#define SIGCHLD           17    /* child process terminated or stopped */
#define SIGWINCH          21    /* window size has changed */

/* POSIX requires the following signals to be defined, even if they are
 * not supported.  Here are the definitions, but they are not supported.
 */
#define SIGCONT           18    /* continue if stopped */
#define SIGSTOP           19    /* stop signal */
#define SIGTSTP           20    /* interactive stop signal */
#define SIGTTIN           22    /* background process wants to read */
#define SIGTTOU           23    /* background process wants to write */

#define _NSIG             23    /* number of signals used */

#ifdef _MINIX
#define SIGIOT             SIGABRT /* for people who speak PDP-11 */

/* MINIX specific signals. These signals are not used by user proceses, 
 * but meant to inform system processes, like the PM, about system events.
 */
#define SIGKMESS          29    /* new kernel message */
#define SIGKSIG           30    /* kernel signal pending */
#define SIGKSTOP          31    /* kernel shutting down */

#endif

/* The sighandler_t type is not allowed unless _POSIX_SOURCE is defined. */
typedef void _PROTOTYPE( (*__sighandler_t), (int) );

/* Macros used as function pointers. */
#define SIG_ERR    ((__sighandler_t) -1)        /* error return */
#define SIG_DFL    ((__sighandler_t)  0)        /* default signal handling */
#define SIG_IGN    ((__sighandler_t)  1)        /* ignore signal */
#define SIG_HOLD   ((__sighandler_t)  2)        /* block signal */
#define SIG_CATCH  ((__sighandler_t)  3)        /* catch signal */
#define SIG_MESS   ((__sighandler_t)  4)        /* pass as message (MINIX) */

#ifdef _POSIX_SOURCE
struct sigaction {
  __sighandler_t sa_handler;    /* SIG_DFL, SIG_IGN, or pointer to function */
  sigset_t sa_mask;             /* signals to be blocked during handler */
  int sa_flags;                 /* special flags */
};

/* Fields for sa_flags. */
#define SA_ONSTACK   0x0001     /* deliver signal on alternate stack */
#define SA_RESETHAND 0x0002     /* reset signal handler when signal caught */
#define SA_NODEFER   0x0004     /* don't block signal while catching it */
#define SA_RESTART   0x0008     /* automatic system call restart */
#define SA_SIGINFO   0x0010     /* extended signal handling */
#define SA_NOCLDWAIT 0x0020     /* don't create zombies */
#define SA_NOCLDSTOP 0x0040     /* don't receive SIGCHLD when child stops */

/* POSIX requires these values for use with sigprocmask(2). */
#define SIG_BLOCK          0    /* for blocking signals */
#define SIG_UNBLOCK        1    /* for unblocking signals */
#define SIG_SETMASK        2    /* for setting the signal mask */
#define SIG_INQUIRE        4    /* for internal use only */
#endif  /* _POSIX_SOURCE */

/* POSIX and ANSI function prototypes. */
_PROTOTYPE( int raise, (int _sig)                                       );
_PROTOTYPE( __sighandler_t signal, (int _sig, __sighandler_t _func)     );

#ifdef _POSIX_SOURCE
_PROTOTYPE( int kill, (pid_t _pid, int _sig)                            );
_PROTOTYPE( int sigaction,
    (int _sig, const struct sigaction *_act, struct sigaction *_oact)   );
_PROTOTYPE( int sigaddset, (sigset_t *_set, int _sig)                   );
_PROTOTYPE( int sigdelset, (sigset_t *_set, int _sig)                   );
_PROTOTYPE( int sigemptyset, (sigset_t *_set)                           );
_PROTOTYPE( int sigfillset, (sigset_t *_set)                            );
_PROTOTYPE( int sigismember, (const sigset_t *_set, int _sig)           );
_PROTOTYPE( int sigpending, (sigset_t *_set)                            );
_PROTOTYPE( int sigprocmask,
            (int _how, const sigset_t *_set, sigset_t *_oset)           );
_PROTOTYPE( int sigsuspend, (const sigset_t *_sigmask)                  );
#endif

#endif /* _SIGNAL_H */