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 <sys/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
  61 #ifdef _MINIX
  62 #define SIGIOT             SIGABRT /* for people who speak PDP-11 */
  63
  64 /* MINIX specific signals. These signals are not used by user proceses,
  65  * but meant to inform system processes, like the PM, about system events.
  66  */
  67 #define SIGKMESS          29    /* new kernel message */
  68 #define SIGKSIG           30    /* kernel signal pending */
  69 #define SIGNDELAY         31    /* end of delay for signal delivery */
  70
  71 #endif
  72
  73 /* The sighandler_t type is not allowed unless _POSIX_SOURCE is defined. */
  74 typedef void _PROTOTYPE( (*__sighandler_t), (int) );
  75
  76 /* Macros used as function pointers. */
  77 #define SIG_ERR    ((__sighandler_t) -1)        /* error return */
  78 #define SIG_DFL    ((__sighandler_t)  0)        /* default signal handling */
  79 #define SIG_IGN    ((__sighandler_t)  1)        /* ignore signal */
  80 #define SIG_HOLD   ((__sighandler_t)  2)        /* block signal */
  81 #define SIG_CATCH  ((__sighandler_t)  3)        /* catch signal */
  82 #define SIG_MESS   ((__sighandler_t)  4)        /* pass as message (MINIX) */
  83
  84 #ifdef _POSIX_SOURCE
  85 struct sigaction {
  86   __sighandler_t sa_handler;    /* SIG_DFL, SIG_IGN, or pointer to function */
  87   sigset_t sa_mask;             /* signals to be blocked during handler */
  88   int sa_flags;                 /* special flags */
  89 };
  90
  91 /* Fields for sa_flags. */
  92 #define SA_ONSTACK   0x0001     /* deliver signal on alternate stack */
  93 #define SA_RESETHAND 0x0002     /* reset signal handler when signal caught */
  94 #define SA_NODEFER   0x0004     /* don't block signal while catching it */
  95 #define SA_RESTART   0x0008     /* automatic system call restart */
  96 #define SA_SIGINFO   0x0010     /* extended signal handling */
  97 #define SA_NOCLDWAIT 0x0020     /* don't create zombies */
  98 #define SA_NOCLDSTOP 0x0040     /* don't receive SIGCHLD when child stops */
  99
 100 /* POSIX requires these values for use with sigprocmask(2). */
 101 #define SIG_BLOCK          0    /* for blocking signals */
 102 #define SIG_UNBLOCK        1    /* for unblocking signals */
 103 #define SIG_SETMASK        2    /* for setting the signal mask */
 104 #define SIG_INQUIRE        4    /* for internal use only */
 105 #endif  /* _POSIX_SOURCE */
 106
 107 /* POSIX and ANSI function prototypes. */
 108 _PROTOTYPE( int raise, (int _sig)                                       );
 109 _PROTOTYPE( __sighandler_t signal, (int _sig, __sighandler_t _func)     );
 110
 111 #ifdef _POSIX_SOURCE
 112 _PROTOTYPE( int kill, (pid_t _pid, int _sig)                            );
 113 _PROTOTYPE( int killpg, (pid_t _pgrp, int _sig)                         );
 114 _PROTOTYPE( int sigaction,
 115     (int _sig, const struct sigaction *_act, struct sigaction *_oact)   );
 116 _PROTOTYPE( int sigpending, (sigset_t *_set)                            );
 117 _PROTOTYPE( int sigprocmask,
 118             (int _how, const sigset_t *_set, sigset_t *_oset)           );
 119 _PROTOTYPE( int sigsuspend, (const sigset_t *_sigmask)                  );
 120
 121 /* For the sigset functions, only use the library version with error
 122  * checking from user programs. System programs need to be able to use
 123  * nonstanard signals.
 124  */
 125 #ifndef _SYSTEM
 126 _PROTOTYPE( int sigaddset, (sigset_t *_set, int _sig)                   );
 127 _PROTOTYPE( int sigdelset, (sigset_t *_set, int _sig)                   );
 128 _PROTOTYPE( int sigemptyset, (sigset_t *_set)                           );
 129 _PROTOTYPE( int sigfillset, (sigset_t *_set)                            );
 130 _PROTOTYPE( int sigismember, (const sigset_t *_set, int _sig)           );
 131 #else
 132 #define sigaddset(set, sig)     ((int) ((*(set) |= (1 << (sig))) && 0))
 133 #define sigdelset(set, sig)     ((int) ((*(set) &= ~(1 << (sig))) && 0))
 134 #define sigemptyset(set)        ((int) (*(set) = 0))
 135 #define sigfillset(set)         ((int) ((*(set) = ~0) && 0))
 136 #define sigismember(set, sig)   ((*(set) & (1 << (sig))) ? 1 : 0)
 137 #endif
 138
 139 #endif
 140
 141 #endif /* _SIGNAL_H */