113 lines
4.4 KiB
C
113 lines
4.4 KiB
C
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/* The <signal.h> header defines all the ANSI and POSIX signals.
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* MINIX supports all the signals required by POSIX. They are defined below.
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* Some additional signals are also supported.
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*/
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#ifndef _SIGNAL_H
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#define _SIGNAL_H
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#ifndef _ANSI_H
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#include <ansi.h>
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#endif
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#ifdef _POSIX_SOURCE
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#ifndef _TYPES_H
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#include <sys/types.h>
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#endif
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#endif
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/* Here are types that are closely associated with signal handling. */
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typedef int sig_atomic_t;
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#ifdef _POSIX_SOURCE
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#ifndef _SIGSET_T
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#define _SIGSET_T
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typedef unsigned long sigset_t;
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#endif
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#endif
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#define _NSIG 17 /* number of signals used */
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#define SIGHUP 1 /* hangup */
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#define SIGINT 2 /* interrupt (DEL) */
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#define SIGQUIT 3 /* quit (ASCII FS) */
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#define SIGILL 4 /* illegal instruction */
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#define SIGTRAP 5 /* trace trap (not reset when caught) */
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#define SIGABRT 6 /* IOT instruction */
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#define SIGIOT 6 /* SIGABRT for people who speak PDP-11 */
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#define SIGUNUSED 7 /* spare code */
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#define SIGFPE 8 /* floating point exception */
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#define SIGKILL 9 /* kill (cannot be caught or ignored) */
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#define SIGUSR1 10 /* user defined signal # 1 */
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#define SIGSEGV 11 /* segmentation violation */
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#define SIGUSR2 12 /* user defined signal # 2 */
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#define SIGPIPE 13 /* write on a pipe with no one to read it */
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#define SIGALRM 14 /* alarm clock */
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#define SIGTERM 15 /* software termination signal from kill */
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#define SIGCHLD 17 /* child process terminated or stopped */
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#define SIGEMT 7 /* obsolete */
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#define SIGBUS 10 /* obsolete */
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/* POSIX requires the following signals to be defined, even if they are
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* not supported. Here are the definitions, but they are not supported.
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*/
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#define SIGCONT 18 /* continue if stopped */
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#define SIGSTOP 19 /* stop signal */
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#define SIGTSTP 20 /* interactive stop signal */
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#define SIGTTIN 21 /* background process wants to read */
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#define SIGTTOU 22 /* background process wants to write */
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/* The sighandler_t type is not allowed unless _POSIX_SOURCE is defined. */
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typedef void _PROTOTYPE( (*__sighandler_t), (int) );
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/* Macros used as function pointers. */
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#define SIG_ERR ((__sighandler_t) -1) /* error return */
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#define SIG_DFL ((__sighandler_t) 0) /* default signal handling */
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#define SIG_IGN ((__sighandler_t) 1) /* ignore signal */
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#define SIG_HOLD ((__sighandler_t) 2) /* block signal */
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#define SIG_CATCH ((__sighandler_t) 3) /* catch signal */
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#ifdef _POSIX_SOURCE
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struct sigaction {
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__sighandler_t sa_handler; /* SIG_DFL, SIG_IGN, or pointer to function */
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sigset_t sa_mask; /* signals to be blocked during handler */
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int sa_flags; /* special flags */
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};
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/* Fields for sa_flags. */
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#define SA_ONSTACK 0x0001 /* deliver signal on alternate stack */
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#define SA_RESETHAND 0x0002 /* reset signal handler when signal caught */
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#define SA_NODEFER 0x0004 /* don't block signal while catching it */
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#define SA_RESTART 0x0008 /* automatic system call restart */
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#define SA_SIGINFO 0x0010 /* extended signal handling */
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#define SA_NOCLDWAIT 0x0020 /* don't create zombies */
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#define SA_NOCLDSTOP 0x0040 /* don't receive SIGCHLD when child stops */
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/* POSIX requires these values for use with sigprocmask(2). */
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#define SIG_BLOCK 0 /* for blocking signals */
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#define SIG_UNBLOCK 1 /* for unblocking signals */
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#define SIG_SETMASK 2 /* for setting the signal mask */
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#define SIG_INQUIRE 4 /* for internal use only */
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#endif /* _POSIX_SOURCE */
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/* POSIX and ANSI function prototypes. */
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_PROTOTYPE( int raise, (int _sig) );
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_PROTOTYPE( __sighandler_t signal, (int _sig, __sighandler_t _func) );
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#ifdef _POSIX_SOURCE
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_PROTOTYPE( int kill, (pid_t _pid, int _sig) );
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_PROTOTYPE( int sigaction,
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(int _sig, const struct sigaction *_act, struct sigaction *_oact) );
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_PROTOTYPE( int sigaddset, (sigset_t *_set, int _sig) );
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_PROTOTYPE( int sigdelset, (sigset_t *_set, int _sig) );
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_PROTOTYPE( int sigemptyset, (sigset_t *_set) );
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_PROTOTYPE( int sigfillset, (sigset_t *_set) );
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_PROTOTYPE( int sigismember, (const sigset_t *_set, int _sig) );
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_PROTOTYPE( int sigpending, (sigset_t *_set) );
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_PROTOTYPE( int sigprocmask,
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(int _how, const sigset_t *_set, sigset_t *_oset) );
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_PROTOTYPE( int sigsuspend, (const sigset_t *_sigmask) );
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#endif
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#endif /* _SIGNAL_H */
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