include/sys/signal.h

   1 /* sys/signal.h */
   2
   3 #ifndef _SYS_SIGNAL_H
   4 #define _SYS_SIGNAL_H
   5
   6 #ifdef __cplusplus
   7 extern "C" {
   8 #endif
   9
  10 #include "_ansi.h"
  11 #include <sys/features.h>
  12
  13 /* #ifndef __STRICT_ANSI__*/
  14
  15 #if defined(_POSIX_THREADS)
  16 #include <sys/types.h>   /* for pthread data types */
  17 #endif
  18
  19 typedef unsigned long sigset_t;
  20
  21 #if defined(__rtems__)
  22
  23 #if defined(_POSIX_REALTIME_SIGNALS)
  24
  25 /* sigev_notify values
  26    NOTE: P1003.1c/D10, p. 34 adds SIGEV_THREAD.  */
  27
  28 #define SIGEV_NONE   1  /* No asynchronous notification shall be delivered */
  29                         /*   when the event of interest occurs. */
  30 #define SIGEV_SIGNAL 2  /* A queued signal, with an application defined */
  31                         /*  value, shall be delivered when the event of */
  32                         /*  interest occurs. */
  33 #define SIGEV_THREAD 3  /* A notification function shall be called to */
  34                         /*   perform notification. */
  35
  36 /*  Signal Generation and Delivery, P1003.1b-1993, p. 63
  37     NOTE: P1003.1c/D10, p. 34 adds sigev_notify_function and
  38           sigev_notify_attributes to the sigevent structure.  */
  39
  40 union sigval {
  41   int    sival_int;    /* Integer signal value */
  42   void  *sival_ptr;    /* Pointer signal value */
  43 };
  44
  45 struct sigevent {
  46   int              sigev_notify;               /* Notification type */
  47   int              sigev_signo;                /* Signal number */
  48   union sigval     sigev_value;                /* Signal value */
  49
  50 #if defined(_POSIX_THREADS)
  51   void           (*sigev_notify_function)( union sigval );
  52                                                /* Notification function */
  53   pthread_attr_t  *sigev_notify_attributes;    /* Notification Attributes */
  54 #endif
  55 };
  56
  57 /* Signal Actions, P1003.1b-1993, p. 64 */
  58 /* si_code values, p. 66 */
  59
  60 #define SI_USER    1    /* Sent by a user. kill(), abort(), etc */
  61 #define SI_QUEUE   2    /* Sent by sigqueue() */
  62 #define SI_TIMER   3    /* Sent by expiration of a timer_settime() timer */
  63 #define SI_ASYNCIO 4    /* Indicates completion of asycnhronous IO */
  64 #define SI_MESGQ   5    /* Indicates arrival of a message at an empty queue */
  65
  66 typedef struct {
  67   int          si_signo;    /* Signal number */
  68   int          si_code;     /* Cause of the signal */
  69   union sigval si_value;    /* Signal value */
  70 } siginfo_t;
  71 #endif
  72
  73 /*  3.3.8 Synchronously Accept a Signal, P1003.1b-1993, p. 76 */
  74
  75 #define SA_NOCLDSTOP 1   /* Do not generate SIGCHLD when children stop */
  76 #define SA_SIGINFO   2   /* Invoke the signal catching function with */
  77                          /*   three arguments instead of one. */
  78
  79 /* struct sigaction notes from POSIX:
  80  *
  81  *  (1) Routines stored in sa_handler should take a single int as
  82  *      there argument although the POSIX standard does not require this.
  83  *  (2) The fields sa_handler and sa_sigaction may overlap, and a conforming
  84  *      application should not use both simultaneously.
  85  */
  86
  87 struct sigaction {
  88   int         sa_flags;       /* Special flags to affect behavior of signal */
  89   sigset_t    sa_mask;        /* Additional set of signals to be blocked */
  90                               /*   during execution of signal-catching */
  91                               /*   function. */
  92   union {
  93     void      (*_handler)();  /* SIG_DFL, SIG_IGN, or pointer to a function */
  94 #if defined(_POSIX_REALTIME_SIGNALS)
  95     void      (*_sigaction)( int, siginfo_t *, void * );
  96 #endif
  97   } _signal_handlers;
  98 };
  99
 100 #define sa_handler    _signal_handlers._handler
 101 #if defined(_POSIX_REALTIME_SIGNALS)
 102 #define sa_sigaction  _signal_handlers._sigaction
 103 #endif
 104
 105 #else
 106
 107 struct sigaction
 108 {
 109         void (*sa_handler)(int);
 110         sigset_t sa_mask;
 111         int sa_flags;
 112 };
 113
 114 #define SA_NOCLDSTOP 1  /* only value supported now for sa_flags */
 115
 116 #if defined(__CYGWIN__) || defined(__MSYS__)
 117 # define SA_RESTART   0x10000000 /* Restart syscall on signal return.  */
 118 # define SA_NODEFER   0x40000000 /* Don't automatically block the signal when
 119                                     its handler is being executed.  */
 120 # define SA_RESETHAND 0x80000000 /* Reset to SIG_DFL on entry to handler.  */
 121 #endif
 122
 123 #endif /* defined(__rtems__) */
 124
 125 #define SIG_SETMASK 0   /* set mask with sigprocmask() */
 126 #define SIG_BLOCK 1     /* set of signals to block */
 127 #define SIG_UNBLOCK 2   /* set of signals to, well, unblock */
 128
 129 /* These depend upon the type of sigset_t, which right now
 130    is always a long.. They're in the POSIX namespace, but
 131    are not ANSI. */
 132 #define sigaddset(what,sig) (*(what) |= (1<<(sig)))
 133 #define sigemptyset(what)   (*(what) = 0)
 134
 135 int _EXFUN(sigprocmask, (int how, const sigset_t *set, sigset_t *oset));
 136
 137 #if defined(_POSIX_THREADS)
 138 int _EXFUN(pthread_sigmask, (int how, const sigset_t *set, sigset_t *oset));
 139 #endif
 140
 141 /* protos for functions found in winsup sources for CYGWIN and MSYS*/
 142 #if defined(__CYGWIN__) || defined(__rtems__) || defined(__MSYS__)
 143 #undef sigaddset
 144 #undef sigemptyset
 145 /* The first argument to kill should be pid_t.  Right now
 146    <sys/types.h> always defines pid_t to be int.  If that ever
 147    changes, then we will need to do something else, perhaps along the
 148    lines of <machine/types.h>.  */
 149 int _EXFUN(kill, (int, int));
 150 int _EXFUN(killpg, (pid_t, int));
 151 int _EXFUN(sigaction, (int, const struct sigaction *, struct sigaction *));
 152 int _EXFUN(sigaddset, (sigset_t *, const int));
 153 int _EXFUN(sigdelset, (sigset_t *, const int));
 154 int _EXFUN(sigismember, (const sigset_t *, int));
 155 int _EXFUN(sigfillset, (sigset_t *));
 156 int _EXFUN(sigemptyset, (sigset_t *));
 157 int _EXFUN(sigpending, (sigset_t *));
 158 int _EXFUN(sigsuspend, (const sigset_t *));
 159 int _EXFUN(sigpause, (int));
 160
 161 #if defined(_POSIX_THREADS)
 162 int _EXFUN(pthread_kill, (pthread_t thread, int sig));
 163 #endif
 164
 165 #if defined(_POSIX_REALTIME_SIGNALS)
 166
 167 /*  3.3.8 Synchronously Accept a Signal, P1003.1b-1993, p. 76
 168     NOTE: P1003.1c/D10, p. 39 adds sigwait().  */
 169
 170 int _EXFUN(sigwaitinfo, (const sigset_t *set, siginfo_t *info));
 171 int _EXFUN(sigtimedwait,
 172   (const sigset_t *set, siginfo_t *info, const struct timespec  *timeout)
 173 );
 174 int _EXFUN(sigwait, (const sigset_t *set, int *sig));
 175
 176 /*  3.3.9 Queue a Signal to a Process, P1003.1b-1993, p. 78 */
 177 int _EXFUN(sigqueue, (pid_t pid, int signo, const union sigval value));
 178
 179 #endif /* defined(_POSIX_REALTIME_SIGNALS) */
 180
 181 #endif /* defined(__CYGWIN32__) || defined(__rtems__) || defined(__MSYS__) */
 182
 183 /* #endif __STRICT_ANSI__ */
 184
 185 #if defined(___AM29K__)
 186 /* These all need to be defined for ANSI C, but I don't think they are
 187    meaningful.  */
 188 #define SIGABRT 1
 189 #define SIGFPE 1
 190 #define SIGILL 1
 191 #define SIGINT 1
 192 #define SIGSEGV 1
 193 #define SIGTERM 1
 194 /* These need to be defined for POSIX, and some others do too.  */
 195 #define SIGHUP 1
 196 #define SIGQUIT 1
 197 #define NSIG 2
 198 #elif defined(__GO32__)
 199 #define SIGINT  1
 200 #define SIGKILL 2
 201 #define SIGPIPE 3
 202 #define SIGFPE  4
 203 #define SIGHUP  5
 204 #define SIGTERM 6
 205 #define SIGSEGV 7
 206 #define SIGTSTP 8
 207 #define SIGQUIT 9
 208 #define SIGTRAP 10
 209 #define SIGILL  11
 210 #define SIGEMT  12
 211 #define SIGALRM 13
 212 #define SIGBUS  14
 213 #define SIGLOST 15
 214 #define SIGSTOP 16
 215 #define SIGABRT 17
 216 #define SIGUSR1 18
 217 #define SIGUSR2 19
 218 #define NSIG    20
 219 #elif defined(__CYGWIN__) || defined(__MSYS__)  /* BSD signals semantics */
 220 #define SIGHUP  1       /* hangup */
 221 #define SIGINT  2       /* interrupt */
 222 #define SIGQUIT 3       /* quit */
 223 #define SIGILL  4       /* illegal instruction (not reset when caught) */
 224 #define SIGTRAP 5       /* trace trap (not reset when caught) */
 225 #define SIGABRT 6       /* used by abort */
 226 #define SIGEMT  7       /* EMT instruction */
 227 #define SIGFPE  8       /* floating point exception */
 228 #define SIGKILL 9       /* kill (cannot be caught or ignored) */
 229 #define SIGBUS  10      /* bus error */
 230 #define SIGSEGV 11      /* segmentation violation */
 231 #define SIGSYS  12      /* bad argument to system call */
 232 #define SIGPIPE 13      /* write on a pipe with no one to read it */
 233 #define SIGALRM 14      /* alarm clock */
 234 #define SIGTERM 15      /* software termination signal from kill */
 235 #define SIGURG  16      /* urgent condition on IO channel */
 236 #define SIGSTOP 17      /* sendable stop signal not from tty */
 237 #define SIGTSTP 18      /* stop signal from tty */
 238 #define SIGCONT 19      /* continue a stopped process */
 239 #define SIGCHLD 20      /* to parent on child stop or exit */
 240 #define SIGCLD  20      /* System V name for SIGCHLD */
 241 #define SIGTTIN 21      /* to readers pgrp upon background tty read */
 242 #define SIGTTOU 22      /* like TTIN for output if (tp->t_local&LTOSTOP) */
 243 #define SIGIO   23      /* input/output possible signal */
 244 #define SIGPOLL SIGIO   /* System V name for SIGIO */
 245 #define SIGXCPU 24      /* exceeded CPU time limit */
 246 #define SIGXFSZ 25      /* exceeded file size limit */
 247 #define SIGVTALRM 26    /* virtual time alarm */
 248 #define SIGPROF 27      /* profiling time alarm */
 249 #define SIGWINCH 28     /* window changed */
 250 #define SIGLOST 29      /* resource lost (eg, record-lock lost) */
 251 #define SIGUSR1 30      /* user defined signal 1 */
 252 #define SIGUSR2 31      /* user defined signal 2 */
 253 #define NSIG    32      /* signal 0 implied */
 254 #else
 255 #define SIGHUP  1       /* hangup */
 256 #define SIGINT  2       /* interrupt */
 257 #define SIGQUIT 3       /* quit */
 258 #define SIGILL  4       /* illegal instruction (not reset when caught) */
 259 #define SIGTRAP 5       /* trace trap (not reset when caught) */
 260 #define SIGIOT  6       /* IOT instruction */
 261 #define SIGABRT 6       /* used by abort, replace SIGIOT in the future */
 262 #define SIGEMT  7       /* EMT instruction */
 263 #define SIGFPE  8       /* floating point exception */
 264 #define SIGKILL 9       /* kill (cannot be caught or ignored) */
 265 #define SIGBUS  10      /* bus error */
 266 #define SIGSEGV 11      /* segmentation violation */
 267 #define SIGSYS  12      /* bad argument to system call */
 268 #define SIGPIPE 13      /* write on a pipe with no one to read it */
 269 #define SIGALRM 14      /* alarm clock */
 270 #define SIGTERM 15      /* software termination signal from kill */
 271
 272 #if defined(__rtems__)
 273 #define SIGUSR1 16  /* reserved as application defined signal 1 */
 274 #define SIGUSR2 17  /* reserved as application defined signal 2 */
 275
 276 #define __SIGFIRSTNOTRT SIGHUP
 277 #define __SIGLASTNOTRT  SIGUSR2
 278
 279 /* RTEMS does not support job control, hence no Job Control Signals are
 280    defined per P1003.1b-1993, p. 60-61.
 281
 282    RTEMS does not support memory protection, hence no Memory Protection
 283    Signals are defined per P1003.1b-1993, p. 60-61. */
 284
 285 /* Real-Time Signals Range, P1003.1b-1993, p. 61
 286    NOTE: By P1003.1b-1993, this should be at least RTSIG_MAX
 287          (which is a minimum of 8) signals.
 288  */
 289
 290 #define SIGRTMIN 18
 291 #define SIGRTMAX 32
 292
 293 #elif defined(__svr4__)
 294 /* svr4 specifics. different signals above 15, and sigaction. */
 295 #define SIGUSR1 16
 296 #define SIGUSR2 17
 297 #define SIGCLD  18
 298 #define SIGPWR  19
 299 #define SIGWINCH 20
 300 #define SIGPOLL 22      /* 20 for x.out binaries!!!! */
 301 #define SIGSTOP 23      /* sendable stop signal not from tty */
 302 #define SIGTSTP 24      /* stop signal from tty */
 303 #define SIGCONT 25      /* continue a stopped process */
 304 #define SIGTTIN 26      /* to readers pgrp upon background tty read */
 305 #define SIGTTOU 27      /* like TTIN for output if (tp->t_local&LTOSTOP) */
 306 #define NSIG    28
 307 #else
 308 #define SIGURG  16      /* urgent condition on IO channel */
 309 #define SIGSTOP 17      /* sendable stop signal not from tty */
 310 #define SIGTSTP 18      /* stop signal from tty */
 311 #define SIGCONT 19      /* continue a stopped process */
 312 #define SIGCHLD 20      /* to parent on child stop or exit */
 313 #define SIGCLD  20      /* System V name for SIGCHLD */
 314 #define SIGTTIN 21      /* to readers pgrp upon background tty read */
 315 #define SIGTTOU 22      /* like TTIN for output if (tp->t_local&LTOSTOP) */
 316 #define SIGIO   23      /* input/output possible signal */
 317 #define SIGPOLL SIGIO   /* System V name for SIGIO */
 318 #define SIGXCPU 24      /* exceeded CPU time limit */
 319 #define SIGXFSZ 25      /* exceeded file size limit */
 320 #define SIGVTALRM 26    /* virtual time alarm */
 321 #define SIGPROF 27      /* profiling time alarm */
 322 #define SIGWINCH 28     /* window changed */
 323 #define SIGLOST 29      /* resource lost (eg, record-lock lost) */
 324 #define SIGUSR1 30      /* user defined signal 1 */
 325 #define SIGUSR2 31      /* user defined signal 2 */
 326 #define NSIG    32      /* signal 0 implied */
 327 #endif
 328 #endif
 329
 330 #ifdef __cplusplus
 331 }
 332 #endif
 333 #endif /* _SYS_SIGNAL_H */