include/signal.h

   1 /* The <signal.h> header defines all the ANSI and POSIX signals.
   2  * MINIX supports all the signals required by POSIX. They are defined below.
   3  * Some additional signals are also supported.
   4  */
   5
   6 #ifndef _SIGNAL_H
   7 #define _SIGNAL_H
   8
   9 #ifndef _ANSI_H
  10 #include <ansi.h>
  11 #endif
  12 #ifdef _POSIX_SOURCE
  13 #ifndef _TYPES_H
  14 #include <minix/types.h>
  15 #endif
  16 #endif
  17
  18 /* Here are types that are closely associated with signal handling. */
  19 typedef int sig_atomic_t;
  20
  21 #ifdef _POSIX_SOURCE
  22 #ifndef _SIGSET_T
  23 #define _SIGSET_T
  24 typedef unsigned long sigset_t;
  25 #endif
  26 #endif
  27
  28 /* Regular signals. */
  29 #define SIGHUP             1    /* hangup */
  30 #define SIGINT             2    /* interrupt (DEL) */
  31 #define SIGQUIT            3    /* quit (ASCII FS) */
  32 #define SIGILL             4    /* illegal instruction */
  33 #define SIGTRAP            5    /* trace trap (not reset when caught) */
  34 #define SIGABRT            6    /* IOT instruction */
  35 #define SIGBUS             7    /* bus error */
  36 #define SIGFPE             8    /* floating point exception */
  37 #define SIGKILL            9    /* kill (cannot be caught or ignored) */
  38 #define SIGUSR1           10    /* user defined signal # 1 */
  39 #define SIGSEGV           11    /* segmentation violation */
  40 #define SIGUSR2           12    /* user defined signal # 2 */
  41 #define SIGPIPE           13    /* write on a pipe with no one to read it */
  42 #define SIGALRM           14    /* alarm clock */
  43 #define SIGTERM           15    /* software termination signal from kill */
  44 #define SIGEMT            16    /* EMT instruction */
  45 #define SIGCHLD           17    /* child process terminated or stopped */
  46 #define SIGWINCH          21    /* window size has changed */
  47 #define SIGVTALRM         24    /* virtual alarm */
  48 #define SIGPROF           25    /* profiler alarm */
  49
  50 /* POSIX requires the following signals to be defined, even if they are
  51  * not supported.  Here are the definitions, but they are not supported.
  52  */
  53 #define SIGCONT           18    /* continue if stopped */
  54 #define SIGSTOP           19    /* stop signal */
  55 #define SIGTSTP           20    /* interactive stop signal */
  56 #define SIGTTIN           22    /* background process wants to read */
  57 #define SIGTTOU           23    /* background process wants to write */
  58
  59 #define _NSIG             26    /* highest signal number plus one */
  60 #define NSIG             _NSIG
  61
  62 #ifdef _MINIX
  63 #define SIGIOT             SIGABRT /* for people who speak PDP-11 */
  64
  65 /* MINIX specific signals. These signals are not used by user proceses,
  66  * but meant to inform system processes, like the PM, about system events.
  67  * The order here determines the order signals are processed by system
  68  * processes in user-space. Higher-priority signals should be first.
  69  */
  70 /* Signals delivered by a signal manager. */
  71 #define SIGSNDELAY        26    /* end of delay for signal delivery */
  72
  73 #define SIGS_FIRST        SIGHUP      /* first system signal */
  74 #define SIGS_LAST         SIGSNDELAY   /* last system signal */
  75 #define IS_SIGS(signo)    (signo>=SIGS_FIRST && signo<=SIGS_LAST)
  76
  77 /* Signals delivered by the kernel. */
  78 #define SIGKMEM           27    /* kernel memory request pending */
  79 #define SIGKMESS          28    /* new kernel message */
  80 #define SIGKSIGSM         29    /* kernel signal pending for signal manager */
  81 #define SIGKSIG           30    /* kernel signal pending */
  82
  83 #define SIGK_FIRST        SIGKMEM      /* first kernel signal */
  84 #define SIGK_LAST         SIGKSIG     /* last kernel signal */
  85 #define IS_SIGK(signo)    (signo>=SIGK_FIRST && signo<=SIGK_LAST)
  86
  87 /* Termination signals for Minix system processes. */
  88 #define SIGS_IS_LETHAL(sig) \
  89     (sig == SIGILL || sig == SIGBUS || sig == SIGFPE || sig == SIGSEGV \
  90     || sig == SIGEMT || sig == SIGABRT)
  91 #define SIGS_IS_TERMINATION(sig) (SIGS_IS_LETHAL(sig) \
  92     || (sig == SIGKILL || sig == SIGPIPE))
  93 #define SIGS_IS_STACKTRACE(sig) (SIGS_IS_LETHAL(sig) && sig != SIGABRT)
  94
  95 #endif
  96
  97 /* The sighandler_t type is not allowed unless _POSIX_SOURCE is defined. */
  98 typedef void _PROTOTYPE( (*__sighandler_t), (int) );
  99
 100 /* Macros used as function pointers. */
 101 #define SIG_ERR    ((__sighandler_t) -1)        /* error return */
 102 #define SIG_DFL    ((__sighandler_t)  0)        /* default signal handling */
 103 #define SIG_IGN    ((__sighandler_t)  1)        /* ignore signal */
 104 #define SIG_HOLD   ((__sighandler_t)  2)        /* block signal */
 105 #define SIG_CATCH  ((__sighandler_t)  3)        /* catch signal */
 106
 107 #ifdef _POSIX_SOURCE
 108 struct sigaction {
 109   __sighandler_t sa_handler;    /* SIG_DFL, SIG_IGN, or pointer to function */
 110   sigset_t sa_mask;             /* signals to be blocked during handler */
 111   int sa_flags;                 /* special flags */
 112 };
 113
 114 /* Fields for sa_flags. */
 115 #define SA_ONSTACK   0x0001     /* deliver signal on alternate stack */
 116 #define SA_RESETHAND 0x0002     /* reset signal handler when signal caught */
 117 #define SA_NODEFER   0x0004     /* don't block signal while catching it */
 118 #define SA_RESTART   0x0008     /* automatic system call restart */
 119 #define SA_SIGINFO   0x0010     /* extended signal handling */
 120 #define SA_NOCLDWAIT 0x0020     /* don't create zombies */
 121 #define SA_NOCLDSTOP 0x0040     /* don't receive SIGCHLD when child stops */
 122
 123 /* POSIX requires these values for use with sigprocmask(2). */
 124 #define SIG_BLOCK          0    /* for blocking signals */
 125 #define SIG_UNBLOCK        1    /* for unblocking signals */
 126 #define SIG_SETMASK        2    /* for setting the signal mask */
 127 #define SIG_INQUIRE        4    /* for internal use only */
 128
 129 /* codes for SIGFPE */
 130 #define FPE_INTOVF      1      /* integer divide by zero */
 131 #define FPE_INTDIV      2      /* integer overflow */
 132 #define FPE_FLTDIV      3      /* floating-point divide by zero */
 133 #define FPE_FLTOVF      4      /* floating-point overflow */
 134 #define FPE_FLTUND      5      /* floating-point underflow */
 135 #define FPE_FLTRES      6      /* floating-point inexact result */
 136 #define FPE_FLTINV      7      /* floating-point invalid operation */
 137 #define FPE_FLTSUB      8      /* subscript out of range */
 138
 139 typedef struct sigaltstack {
 140   void *ss_sp;
 141   int ss_flags;
 142   size_t ss_size;
 143 } stack_t;
 144
 145 #define MINSIGSTKSZ     2048    /* Minimal stack size is 2k */
 146
 147 /* Fields for ss_flags */
 148 #define SS_ONSTACK      1      /* Process is executing on an alternate stack */
 149 #define SS_DISABLE      2      /* Alternate stack is disabled */
 150
 151
 152 #endif  /* _POSIX_SOURCE */
 153
 154 /* POSIX and ANSI function prototypes. */
 155 _PROTOTYPE( int raise, (int _sig)                                       );
 156 _PROTOTYPE( __sighandler_t signal, (int _sig, __sighandler_t _func)     );
 157
 158 #ifdef _POSIX_SOURCE
 159 _PROTOTYPE( int kill, (pid_t _pid, int _sig)                            );
 160 _PROTOTYPE( int killpg, (pid_t _pgrp, int _sig)                         );
 161 _PROTOTYPE( int sigaction,
 162     (int _sig, const struct sigaction *_act, struct sigaction *_oact)   );
 163 _PROTOTYPE( int sigpending, (sigset_t *_set)                            );
 164 _PROTOTYPE( int sigprocmask,
 165             (int _how, const sigset_t *_set, sigset_t *_oset)           );
 166 _PROTOTYPE( int sigsuspend, (const sigset_t *_sigmask)                  );
 167
 168 /* For the sigset functions, only use the library version with error
 169  * checking from user programs. System programs need to be able to use
 170  * nonstanard signals.
 171  */
 172 #ifndef _SYSTEM
 173 _PROTOTYPE( int sigaddset, (sigset_t *_set, int _sig)                   );
 174 _PROTOTYPE( int sigdelset, (sigset_t *_set, int _sig)                   );
 175 _PROTOTYPE( int sigemptyset, (sigset_t *_set)                           );
 176 _PROTOTYPE( int sigfillset, (sigset_t *_set)                            );
 177 _PROTOTYPE( int sigismember, (const sigset_t *_set, int _sig)           );
 178 #else
 179 #define sigaddset(set, sig)     ((int) ((*(set) |= (1 << (sig))) && 0))
 180 #define sigdelset(set, sig)     ((int) ((*(set) &= ~(1 << (sig))) && 0))
 181 #define sigemptyset(set)        ((int) (*(set) = 0))
 182 #define sigfillset(set)         ((int) ((*(set) = ~0) && 0))
 183 #define sigismember(set, sig)   ((*(set) & (1 << (sig))) ? 1 : 0)
 184 #endif
 185
 186 #endif
 187
 188 #endif /* _SIGNAL_H */