include/sys/signal.h

   1 #ifndef _SYS_SIGNAL_H_
   2 #define _SYS_SIGNAL_H_
   3
   4 #include <sys/featuretest.h>
   5 #include <sys/sigtypes.h>
   6
   7 #define _NSIG           26
   8 #define NSIG _NSIG
   9
  10
  11 /* Regular signals. */
  12 #define SIGHUP             1    /* hangup */
  13 #define SIGINT             2    /* interrupt (DEL) */
  14 #define SIGQUIT            3    /* quit (ASCII FS) */
  15 #define SIGILL             4    /* illegal instruction */
  16 #define SIGTRAP            5    /* trace trap (not reset when caught) */
  17 #define SIGABRT            6    /* IOT instruction */
  18 #define SIGBUS             7    /* bus error */
  19 #define SIGFPE             8    /* floating point exception */
  20 #define SIGKILL            9    /* kill (cannot be caught or ignored) */
  21 #define SIGUSR1           10    /* user defined signal # 1 */
  22 #define SIGSEGV           11    /* segmentation violation */
  23 #define SIGUSR2           12    /* user defined signal # 2 */
  24 #define SIGPIPE           13    /* write on a pipe with no one to read it */
  25 #define SIGALRM           14    /* alarm clock */
  26 #define SIGTERM           15    /* software termination signal from kill */
  27 #define SIGEMT            16    /* EMT instruction */
  28 #define SIGCHLD           17    /* child process terminated or stopped */
  29 #define SIGWINCH          21    /* window size has changed */
  30 #define SIGVTALRM         24    /* virtual alarm */
  31 #define SIGPROF           25    /* profiler alarm */
  32
  33 /* POSIX requires the following signals to be defined, even if they are
  34  * not supported.  Here are the definitions, but they are not supported.
  35  */
  36 #define SIGCONT           18    /* continue if stopped */
  37 #define SIGSTOP           19    /* stop signal */
  38 #define SIGTSTP           20    /* interactive stop signal */
  39 #define SIGTTIN           22    /* background process wants to read */
  40 #define SIGTTOU           23    /* background process wants to write */
  41
  42 #ifdef _MINIX
  43 #define SIGIOT             SIGABRT /* for people who speak PDP-11 */
  44
  45 /* MINIX specific signals. These signals are not used by user proceses,
  46  * but meant to inform system processes, like the PM, about system events.
  47  * The order here determines the order signals are processed by system
  48  * processes in user-space. Higher-priority signals should be first.
  49  */
  50 /* Signals delivered by a signal manager. */
  51 #define SIGSNDELAY        26    /* end of delay for signal delivery */
  52
  53 #define SIGS_FIRST        SIGHUP      /* first system signal */
  54 #define SIGS_LAST         SIGSNDELAY   /* last system signal */
  55 #define IS_SIGS(signo)    (signo>=SIGS_FIRST && signo<=SIGS_LAST)
  56
  57 /* Signals delivered by the kernel. */
  58 #define SIGKMEM           27    /* kernel memory request pending */
  59 #define SIGKMESS          28    /* new kernel message */
  60 #define SIGKSIGSM         29    /* kernel signal pending for signal manager */
  61 #define SIGKSIG           30    /* kernel signal pending */
  62
  63 #define SIGK_FIRST        SIGKMEM      /* first kernel signal */
  64 #define SIGK_LAST         SIGKSIG     /* last kernel signal */
  65 #define IS_SIGK(signo)    (signo>=SIGK_FIRST && signo<=SIGK_LAST)
  66
  67 /* Termination signals for Minix system processes. */
  68 #define SIGS_IS_LETHAL(sig) \
  69     (sig == SIGILL || sig == SIGBUS || sig == SIGFPE || sig == SIGSEGV \
  70     || sig == SIGEMT || sig == SIGABRT)
  71 #define SIGS_IS_TERMINATION(sig) (SIGS_IS_LETHAL(sig) \
  72     || (sig == SIGKILL || sig == SIGPIPE))
  73 #define SIGS_IS_STACKTRACE(sig) (SIGS_IS_LETHAL(sig) && sig != SIGABRT)
  74
  75 #endif
  76
  77 #include <sys/cdefs.h>
  78
  79 typedef void (*__sighandler_t)(int);
  80
  81 /* Macros used as function pointers. */
  82 #define SIG_ERR    ((__sighandler_t) -1)        /* error return */
  83 #define SIG_DFL    ((__sighandler_t)  0)        /* default signal handling */
  84 #define SIG_IGN    ((__sighandler_t)  1)        /* ignore signal */
  85 #define SIG_HOLD   ((__sighandler_t)  2)        /* block signal */
  86 #define SIG_CATCH  ((__sighandler_t)  3)        /* catch signal */
  87
  88 #if defined(_POSIX_C_SOURCE) || defined(_XOPEN_SOURCE) || \
  89     defined(_NETBSD_SOURCE)
  90
  91 #if (_POSIX_C_SOURCE - 0) >= 199309L || (_XOPEN_SOURCE - 0) >= 500 || \
  92     defined(_NETBSD_SOURCE)
  93 #include <sys/siginfo.h>
  94 #endif
  95
  96 #if (defined(_XOPEN_SOURCE) && defined(_XOPEN_SOURCE_EXTENDED)) || \
  97     (_XOPEN_SOURCE - 0) >= 500 || defined(_NETBSD_SOURCE)
  98 #include <sys/ucontext.h>
  99 #endif /* _XOPEN_SOURCE_EXTENDED || _XOPEN_SOURCE >= 500 || _NETBSD_SOURCE */
 100
 101 /*
 102  * Signal vector "template" used in sigaction call.
 103  */
 104 struct  sigaction {
 105         union {
 106                 void (*_sa_handler)(int);
 107 #if (_POSIX_C_SOURCE - 0) >= 199309L || (_XOPEN_SOURCE - 0) >= 500 || \
 108     defined(_NETBSD_SOURCE)
 109                 void (*_sa_sigaction)(int, siginfo_t *, void *);
 110 #endif
 111         } _sa_u;        /* signal handler */
 112         sigset_t sa_mask;               /* signal mask to apply */
 113         int     sa_flags;               /* see signal options below */
 114 };
 115
 116 #define sa_handler _sa_u._sa_handler
 117 #if (_POSIX_C_SOURCE - 0) >= 199309L || (_XOPEN_SOURCE - 0) >= 500 || \
 118     defined(_NETBSD_SOURCE)
 119 #define sa_sigaction _sa_u._sa_sigaction
 120 #endif
 121
 122 #include <machine/signal.h>     /* sigcontext; codes for SIGILL, SIGFPE */
 123
 124 /* Fields for sa_flags. */
 125 #define SA_ONSTACK   0x0001     /* deliver signal on alternate stack */
 126 #define SA_RESETHAND 0x0002     /* reset signal handler when signal caught */
 127 #define SA_NODEFER   0x0004     /* don't block signal while catching it */
 128 #define SA_RESTART   0x0008     /* automatic system call restart */
 129 #define SA_SIGINFO   0x0010     /* extended signal handling */
 130 #define SA_NOCLDWAIT 0x0020     /* don't create zombies */
 131 #define SA_NOCLDSTOP 0x0040     /* don't receive SIGCHLD when child stops */
 132
 133 /* POSIX requires these values for use with sigprocmask(2). */
 134 #define SIG_BLOCK          0    /* for blocking signals */
 135 #define SIG_UNBLOCK        1    /* for unblocking signals */
 136 #define SIG_SETMASK        2    /* for setting the signal mask */
 137 #define SIG_INQUIRE        4    /* for internal use only */
 138
 139 #if defined(_NETBSD_SOURCE)
 140 typedef void (*sig_t)(int);     /* type of signal function */
 141 #endif
 142
 143 #if (defined(_XOPEN_SOURCE) && defined(_XOPEN_SOURCE_EXTENDED)) || \
 144     (_XOPEN_SOURCE - 0) >= 500 || defined(_NETBSD_SOURCE)
 145 /*
 146  * Flags used with stack_t/struct sigaltstack.
 147  */
 148 #define SS_ONSTACK      1      /* Process is executing on an alternate stack */
 149 #define SS_DISABLE      2      /* Alternate stack is disabled */
 150
 151 #define MINSIGSTKSZ     2048    /* Minimal stack size is 2k */
 152 #define SIGSTKSZ        (MINSIGSTKSZ + 32768)   /* recommended stack size */
 153 #endif /* _XOPEN_SOURCE_EXTENDED || _XOPEN_SOURCE >= 500 || _NETBSD_SOURCE */
 154
 155 #if (defined(_XOPEN_SOURCE) && defined(_XOPEN_SOURCE_EXTENDED)) || \
 156     (_XOPEN_SOURCE - 0) >= 500 || defined(_NETBSD_SOURCE)
 157 /*
 158  * Structure used in sigstack call.
 159  */
 160 struct  sigstack {
 161         void    *ss_sp;                 /* signal stack pointer */
 162         int     ss_onstack;             /* current status */
 163 };
 164 #endif /* _XOPEN_SOURCE_EXTENDED || _XOPEN_SOURCE >= 500 || _NETBSD_SOURCE */
 165
 166 #if defined(_NETBSD_SOURCE) && !defined(_KERNEL)
 167 /*
 168  * Macro for converting signal number to a mask suitable for
 169  * sigblock().
 170  */
 171 #define sigmask(n)      __sigmask(n)
 172
 173 #define BADSIG          SIG_ERR
 174 #endif /* _NETBSD_SOURCE */
 175
 176 #if (_POSIX_C_SOURCE - 0) >= 199309L || (_XOPEN_SOURCE - 0) >= 500 || \
 177     defined(_NETBSD_SOURCE)
 178 struct  sigevent {
 179         int     sigev_notify;
 180         int     sigev_signo;
 181         union sigval    sigev_value;
 182         void    (*sigev_notify_function)(union sigval);
 183         void /* pthread_attr_t */       *sigev_notify_attributes;
 184 };
 185
 186 #define SIGEV_NONE      0
 187 #define SIGEV_SIGNAL    1
 188 #define SIGEV_THREAD    2
 189 #if defined(_NETBSD_SOURCE)
 190 #define SIGEV_SA        3
 191 #endif
 192 #endif /* (_POSIX_C_SOURCE - 0) >= 199309L || ... */
 193
 194 #endif  /* _POSIX_C_SOURCE || _XOPEN_SOURCE || _NETBSD_SOURCE */
 195
 196 /*
 197  * For historical reasons; programs expect signal's return value to be
 198  * defined by <sys/signal.h>.
 199  */
 200 __BEGIN_DECLS
 201 void    (*signal(int, void (*)(int)))(int);
 202 __END_DECLS
 203 #endif  /* !_SYS_SIGNAL_H_ */
 204
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