The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/include/signal.h

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    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 #define SIGHUP             1    /* hangup */
   29 #define SIGINT             2    /* interrupt (DEL) */
   30 #define SIGQUIT            3    /* quit (ASCII FS) */
   31 #define SIGILL             4    /* illegal instruction */
   32 #define SIGTRAP            5    /* trace trap (not reset when caught) */
   33 #define SIGABRT            6    /* IOT instruction */
   34 #define SIGIOT             6    /* SIGABRT for people who speak PDP-11 */
   35 #define SIGUNUSED          7    /* spare code */
   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 SIGCHLD           17    /* child process terminated or stopped */
   45 
   46 #define SIGEMT             7    /* obsolete */
   47 #define SIGBUS            10    /* obsolete */
   48 
   49 /* MINIX specific signals. These signals are not used by user proceses, 
   50  * but meant to inform system processes, like the PM, about system events.
   51  */
   52 #define SIGKMESS          18    /* new kernel message */
   53 #define SIGKSIG           19    /* kernel signal pending */
   54 #define SIGKSTOP          20    /* kernel shutting down */
   55 
   56 /* Regular signals. */
   57 #define SIGWINCH          21    /* window size has changed */
   58 
   59 #define _NSIG             21    /* number of signals used */
   60 
   61 /* POSIX requires the following signals to be defined, even if they are
   62  * not supported.  Here are the definitions, but they are not supported.
   63  */
   64 #define SIGCONT           18    /* continue if stopped */
   65 #define SIGSTOP           19    /* stop signal */
   66 #define SIGTSTP           20    /* interactive stop signal */
   67 #define SIGTTIN           21    /* background process wants to read */
   68 #define SIGTTOU           22    /* background process wants to write */
   69 
   70 /* The sighandler_t type is not allowed unless _POSIX_SOURCE is defined. */
   71 typedef void _PROTOTYPE( (*__sighandler_t), (int) );
   72 
   73 /* Macros used as function pointers. */
   74 #define SIG_ERR    ((__sighandler_t) -1)        /* error return */
   75 #define SIG_DFL    ((__sighandler_t)  0)        /* default signal handling */
   76 #define SIG_IGN    ((__sighandler_t)  1)        /* ignore signal */
   77 #define SIG_HOLD   ((__sighandler_t)  2)        /* block signal */
   78 #define SIG_CATCH  ((__sighandler_t)  3)        /* catch signal */
   79 #define SIG_MESS   ((__sighandler_t)  4)        /* pass as message (MINIX) */
   80 
   81 #ifdef _POSIX_SOURCE
   82 struct sigaction {
   83   __sighandler_t sa_handler;    /* SIG_DFL, SIG_IGN, or pointer to function */
   84   sigset_t sa_mask;             /* signals to be blocked during handler */
   85   int sa_flags;                 /* special flags */
   86 };
   87 
   88 /* Fields for sa_flags. */
   89 #define SA_ONSTACK   0x0001     /* deliver signal on alternate stack */
   90 #define SA_RESETHAND 0x0002     /* reset signal handler when signal caught */
   91 #define SA_NODEFER   0x0004     /* don't block signal while catching it */
   92 #define SA_RESTART   0x0008     /* automatic system call restart */
   93 #define SA_SIGINFO   0x0010     /* extended signal handling */
   94 #define SA_NOCLDWAIT 0x0020     /* don't create zombies */
   95 #define SA_NOCLDSTOP 0x0040     /* don't receive SIGCHLD when child stops */
   96 
   97 /* POSIX requires these values for use with sigprocmask(2). */
   98 #define SIG_BLOCK          0    /* for blocking signals */
   99 #define SIG_UNBLOCK        1    /* for unblocking signals */
  100 #define SIG_SETMASK        2    /* for setting the signal mask */
  101 #define SIG_INQUIRE        4    /* for internal use only */
  102 #endif  /* _POSIX_SOURCE */
  103 
  104 /* POSIX and ANSI function prototypes. */
  105 _PROTOTYPE( int raise, (int _sig)                                       );
  106 _PROTOTYPE( __sighandler_t signal, (int _sig, __sighandler_t _func)     );
  107 
  108 #ifdef _POSIX_SOURCE
  109 _PROTOTYPE( int kill, (pid_t _pid, int _sig)                            );
  110 _PROTOTYPE( int sigaction,
  111     (int _sig, const struct sigaction *_act, struct sigaction *_oact)   );
  112 _PROTOTYPE( int sigaddset, (sigset_t *_set, int _sig)                   );
  113 _PROTOTYPE( int sigdelset, (sigset_t *_set, int _sig)                   );
  114 _PROTOTYPE( int sigemptyset, (sigset_t *_set)                           );
  115 _PROTOTYPE( int sigfillset, (sigset_t *_set)                            );
  116 _PROTOTYPE( int sigismember, (const sigset_t *_set, int _sig)           );
  117 _PROTOTYPE( int sigpending, (sigset_t *_set)                            );
  118 _PROTOTYPE( int sigprocmask,
  119             (int _how, const sigset_t *_set, sigset_t *_oset)           );
  120 _PROTOTYPE( int sigsuspend, (const sigset_t *_sigmask)                  );
  121 #endif
  122 
  123 #endif /* _SIGNAL_H */

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