| [4] | 1 | /* The <signal.h> header defines all the ANSI and POSIX signals.
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| 2 | * MINIX supports all the signals required by POSIX. They are defined below.
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| 3 | * Some additional signals are also supported.
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| 4 | */
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| 5 |
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| 6 | #ifndef _SIGNAL_H
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| 7 | #define _SIGNAL_H
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| 8 |
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| 9 | #ifndef _ANSI_H
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| 10 | #include <ansi.h>
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| 11 | #endif
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| 12 | #ifdef _POSIX_SOURCE
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| 13 | #ifndef _TYPES_H
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| 14 | #include <sys/types.h>
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| 15 | #endif
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| 16 | #endif
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| 17 |
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| 18 | /* Here are types that are closely associated with signal handling. */
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| 19 | typedef int sig_atomic_t;
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| 20 |
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| 21 | #ifdef _POSIX_SOURCE
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| 22 | #ifndef _SIGSET_T
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| 23 | #define _SIGSET_T
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| 24 | typedef unsigned long sigset_t;
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| 25 | #endif
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| 26 | #endif
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| 27 |
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| 28 | #define _NSIG 20 /* number of signals used */
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| 29 |
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| 30 | #define SIGHUP 1 /* hangup */
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| 31 | #define SIGINT 2 /* interrupt (DEL) */
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| 32 | #define SIGQUIT 3 /* quit (ASCII FS) */
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| 33 | #define SIGILL 4 /* illegal instruction */
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| 34 | #define SIGTRAP 5 /* trace trap (not reset when caught) */
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| 35 | #define SIGABRT 6 /* IOT instruction */
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| 36 | #define SIGIOT 6 /* SIGABRT for people who speak PDP-11 */
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| 37 | #define SIGUNUSED 7 /* spare code */
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| 38 | #define SIGFPE 8 /* floating point exception */
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| 39 | #define SIGKILL 9 /* kill (cannot be caught or ignored) */
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| 40 | #define SIGUSR1 10 /* user defined signal # 1 */
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| 41 | #define SIGSEGV 11 /* segmentation violation */
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| 42 | #define SIGUSR2 12 /* user defined signal # 2 */
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| 43 | #define SIGPIPE 13 /* write on a pipe with no one to read it */
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| 44 | #define SIGALRM 14 /* alarm clock */
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| 45 | #define SIGTERM 15 /* software termination signal from kill */
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| 46 | #define SIGCHLD 17 /* child process terminated or stopped */
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| 47 |
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| 48 | #define SIGEMT 7 /* obsolete */
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| 49 | #define SIGBUS 10 /* obsolete */
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| 50 |
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| 51 | /* MINIX specific signals. These signals are not used by user proceses,
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| 52 | * but meant to inform system processes, like the PM, about system events.
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| 53 | */
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| 54 | #define SIGKMESS 18 /* new kernel message */
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| 55 | #define SIGKSIG 19 /* kernel signal pending */
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| 56 | #define SIGKSTOP 20 /* kernel shutting down */
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| 57 |
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| 58 | /* POSIX requires the following signals to be defined, even if they are
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| 59 | * not supported. Here are the definitions, but they are not supported.
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| 60 | */
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| 61 | #define SIGCONT 18 /* continue if stopped */
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| 62 | #define SIGSTOP 19 /* stop signal */
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| 63 | #define SIGTSTP 20 /* interactive stop signal */
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| 64 | #define SIGTTIN 21 /* background process wants to read */
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| 65 | #define SIGTTOU 22 /* background process wants to write */
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| 66 |
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| 67 | /* The sighandler_t type is not allowed unless _POSIX_SOURCE is defined. */
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| 68 | typedef void _PROTOTYPE( (*__sighandler_t), (int) );
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| 69 |
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| 70 | /* Macros used as function pointers. */
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| 71 | #define SIG_ERR ((__sighandler_t) -1) /* error return */
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| 72 | #define SIG_DFL ((__sighandler_t) 0) /* default signal handling */
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| 73 | #define SIG_IGN ((__sighandler_t) 1) /* ignore signal */
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| 74 | #define SIG_HOLD ((__sighandler_t) 2) /* block signal */
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| 75 | #define SIG_CATCH ((__sighandler_t) 3) /* catch signal */
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| 76 | #define SIG_MESS ((__sighandler_t) 4) /* pass as message (MINIX) */
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| 77 |
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| 78 | #ifdef _POSIX_SOURCE
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| 79 | struct sigaction {
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| 80 | __sighandler_t sa_handler; /* SIG_DFL, SIG_IGN, or pointer to function */
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| 81 | sigset_t sa_mask; /* signals to be blocked during handler */
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| 82 | int sa_flags; /* special flags */
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| 83 | };
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| 84 |
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| 85 | /* Fields for sa_flags. */
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| 86 | #define SA_ONSTACK 0x0001 /* deliver signal on alternate stack */
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| 87 | #define SA_RESETHAND 0x0002 /* reset signal handler when signal caught */
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| 88 | #define SA_NODEFER 0x0004 /* don't block signal while catching it */
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| 89 | #define SA_RESTART 0x0008 /* automatic system call restart */
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| 90 | #define SA_SIGINFO 0x0010 /* extended signal handling */
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| 91 | #define SA_NOCLDWAIT 0x0020 /* don't create zombies */
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| 92 | #define SA_NOCLDSTOP 0x0040 /* don't receive SIGCHLD when child stops */
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| 93 |
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| 94 | /* POSIX requires these values for use with sigprocmask(2). */
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| 95 | #define SIG_BLOCK 0 /* for blocking signals */
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| 96 | #define SIG_UNBLOCK 1 /* for unblocking signals */
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| 97 | #define SIG_SETMASK 2 /* for setting the signal mask */
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| 98 | #define SIG_INQUIRE 4 /* for internal use only */
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| 99 | #endif /* _POSIX_SOURCE */
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| 100 |
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| 101 | /* POSIX and ANSI function prototypes. */
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| 102 | _PROTOTYPE( int raise, (int _sig) );
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| 103 | _PROTOTYPE( __sighandler_t signal, (int _sig, __sighandler_t _func) );
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| 104 |
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| 105 | #ifdef _POSIX_SOURCE
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| 106 | _PROTOTYPE( int kill, (pid_t _pid, int _sig) );
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| 107 | _PROTOTYPE( int sigaction,
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| 108 | (int _sig, const struct sigaction *_act, struct sigaction *_oact) );
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| 109 | _PROTOTYPE( int sigaddset, (sigset_t *_set, int _sig) );
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| 110 | _PROTOTYPE( int sigdelset, (sigset_t *_set, int _sig) );
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| 111 | _PROTOTYPE( int sigemptyset, (sigset_t *_set) );
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| 112 | _PROTOTYPE( int sigfillset, (sigset_t *_set) );
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| 113 | _PROTOTYPE( int sigismember, (const sigset_t *_set, int _sig) );
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| 114 | _PROTOTYPE( int sigpending, (sigset_t *_set) );
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| 115 | _PROTOTYPE( int sigprocmask,
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| 116 | (int _how, const sigset_t *_set, sigset_t *_oset) );
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| 117 | _PROTOTYPE( int sigsuspend, (const sigset_t *_sigmask) );
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| 118 | #endif
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| 119 |
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| 120 | #endif /* _SIGNAL_H */
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