signal.h内容,先mark着,系统写信号的时候用.

  1 /* Copyright (C) 1991-2003, 2004 Free Software Foundation, Inc.

  2    This file is part of the GNU C Library.

  3 

  4    The GNU C Library is free software; you can redistribute it and/or

  5    modify it under the terms of the GNU Lesser General Public

  6    License as published by the Free Software Foundation; either

  7    version 2.1 of the License, or (at your option) any later version.

  8 

  9    The GNU C Library is distributed in the hope that it will be useful,

 10    but WITHOUT ANY WARRANTY; without even the implied warranty of

 11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 12    Lesser General Public License for more details.

 13 

 14    You should have received a copy of the GNU Lesser General Public

 15    License along with the GNU C Library; if not, write to the Free

 16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

 17    02111-1307 USA.  */

 18 

 19 /*

 20  *      ISO C99 Standard: 7.14 Signal handling <signal.h>

 21  */

 22 

 23 #ifndef _SIGNAL_H

 24 

 25 #if !defined __need_sig_atomic_t && !defined __need_sigset_t

 26 # define _SIGNAL_H

 27 #endif

 28 

 29 #include <features.h>

 30 

 31 __BEGIN_DECLS

 32 

 33 #include <bits/sigset.h>                /* __sigset_t, __sig_atomic_t.  */

 34 

 35 /* An integral type that can be modified atomically, without the

 36    possibility of a signal arriving in the middle of the operation.  */

 37 #if defined __need_sig_atomic_t || defined _SIGNAL_H

 38 # ifndef __sig_atomic_t_defined

 39 #  define __sig_atomic_t_defined

 40 __BEGIN_NAMESPACE_STD

 41 typedef __sig_atomic_t sig_atomic_t;

 42 __END_NAMESPACE_STD

 43 # endif

 44 # undef __need_sig_atomic_t

 45 #endif

 46 

 47 #if defined __need_sigset_t || (defined _SIGNAL_H && defined __USE_POSIX)

 48 # ifndef __sigset_t_defined

 49 #  define __sigset_t_defined

 50 typedef __sigset_t sigset_t;

 51 # endif

 52 # undef __need_sigset_t

 53 #endif

 54 

 55 #ifdef _SIGNAL_H

 56 

 57 #include <bits/types.h>

 58 #include <bits/signum.h>

 59 

 60 #if defined __USE_XOPEN || defined __USE_XOPEN2K

 61 # ifndef __pid_t_defined

 62 typedef __pid_t pid_t;

 63 #  define __pid_t_defined

 64 #endif

 65 #ifdef __USE_XOPEN

 66 # endif

 67 # ifndef __uid_t_defined

 68 typedef __uid_t uid_t;

 69 #  define __uid_t_defined

 70 # endif

 71 #endif  /* Unix98 */

 72 

 73 

 74 /* Type of a signal handler.  */

 75 typedef void (*__sighandler_t) (int);

 76 

 77 /* The X/Open definition of `signal' specifies the SVID semantic.  Use

 78    the additional function `sysv_signal' when X/Open compatibility is

 79    requested.  */

 80 extern __sighandler_t __sysv_signal (int __sig, __sighandler_t __handler)

 81      __THROW;

 82 #ifdef __USE_GNU

 83 extern __sighandler_t sysv_signal (int __sig, __sighandler_t __handler)

 84      __THROW;

 85 #endif

 86 

 87 /* Set the handler for the signal SIG to HANDLER, returning the old

 88    handler, or SIG_ERR on error.

 89    By default `signal' has the BSD semantic.  */

 90 __BEGIN_NAMESPACE_STD

 91 #ifdef __USE_BSD

 92 extern __sighandler_t signal (int __sig, __sighandler_t __handler)

 93      __THROW;

 94 #else

 95 /* Make sure the used `signal' implementation is the SVID version. */

 96 # ifdef __REDIRECT_NTH

 97 extern __sighandler_t __REDIRECT_NTH (signal,

 98                                       (int __sig, __sighandler_t __handler),

 99                                       __sysv_signal);

100 # else

101 #  define signal __sysv_signal

102 # endif

103 #endif

104 __END_NAMESPACE_STD

105 

106 #ifdef __USE_XOPEN

107 /* The X/Open definition of `signal' conflicts with the BSD version.

108    So they defined another function `bsd_signal'.  */

109 extern __sighandler_t bsd_signal (int __sig, __sighandler_t __handler)

110      __THROW;

111 #endif

112 

113 /* Send signal SIG to process number PID.  If PID is zero,

114    send SIG to all processes in the current process's process group.

115    If PID is < -1, send SIG to all processes in process group - PID.  */

116 #ifdef __USE_POSIX

117 extern int kill (__pid_t __pid, int __sig) __THROW;

118 #endif /* Use POSIX.  */

119 

120 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED

121 /* Send SIG to all processes in process group PGRP.

122    If PGRP is zero, send SIG to all processes in

123    the current process's process group.  */

124 extern int killpg (__pid_t __pgrp, int __sig) __THROW;

125 #endif /* Use BSD || X/Open Unix.  */

126 

127 __BEGIN_NAMESPACE_STD

128 /* Raise signal SIG, i.e., send SIG to yourself.  */

129 extern int raise (int __sig) __THROW;

130 __END_NAMESPACE_STD

131 

132 #ifdef __USE_SVID

133 /* SVID names for the same things.  */

134 extern __sighandler_t ssignal (int __sig, __sighandler_t __handler)

135      __THROW;

136 extern int gsignal (int __sig) __THROW;

137 #endif /* Use SVID.  */

138 

139 #ifdef __USE_MISC

140 /* Print a message describing the meaning of the given signal number.  */

141 extern void psignal (int __sig, __const char *__s);

142 #endif /* Use misc.  */

143 

144 

145 /* The `sigpause' function has two different interfaces.  The original

146    BSD definition defines the argument as a mask of the signal, while

147    the more modern interface in X/Open defines it as the signal

148    number.  We go with the BSD version unless the user explicitly

149    selects the X/Open version.

150 

151    This function is a cancellation point and therefore not marked with

152    __THROW.  */

153 extern int __sigpause (int __sig_or_mask, int __is_sig);

154 

155 #ifdef __FAVOR_BSD

156 /* Set the mask of blocked signals to MASK,

157    wait for a signal to arrive, and then restore the mask.  */

158 extern int sigpause (int __mask) __THROW __attribute_deprecated__;

159 #else

160 # ifdef __USE_XOPEN

161 #  ifdef __GNUC__

162 extern int sigpause (int __sig) __asm__ ("__xpg_sigpause");

163 #  else

164 /* Remove a signal from the signal mask and suspend the process.  */

165 #   define sigpause(sig) __sigpause ((sig), 1)

166 #  endif

167 # endif

168 #endif

169 

170 

171 #ifdef __USE_BSD

172 /* None of the following functions should be used anymore.  They are here

173    only for compatibility.  A single word (`int') is not guaranteed to be

174    enough to hold a complete signal mask and therefore these functions

175    simply do not work in many situations.  Use `sigprocmask' instead.  */

176 

177 /* Compute mask for signal SIG.  */

178 # define sigmask(sig)   __sigmask(sig)

179 

180 /* Block signals in MASK, returning the old mask.  */

181 extern int sigblock (int __mask) __THROW __attribute_deprecated__;

182 

183 /* Set the mask of blocked signals to MASK, returning the old mask.  */

184 extern int sigsetmask (int __mask) __THROW __attribute_deprecated__;

185 

186 /* Return currently selected signal mask.  */

187 extern int siggetmask (void) __THROW __attribute_deprecated__;

188 #endif /* Use BSD.  */

189 

190 

191 #ifdef __USE_MISC

192 # define NSIG   _NSIG

193 #endif

194 

195 #ifdef __USE_GNU

196 typedef __sighandler_t sighandler_t;

197 #endif

198 

199 /* 4.4 BSD uses the name `sig_t' for this.  */

200 #ifdef __USE_BSD

201 typedef __sighandler_t sig_t;

202 #endif

203 

204 #ifdef __USE_POSIX

205 

206 # ifdef __USE_POSIX199309

207 /* We need `struct timespec' later on.  */

208 #  define __need_timespec

209 #  include <time.h>

210 

211 /* Get the `siginfo_t' type plus the needed symbols.  */

212 #  include <bits/siginfo.h>

213 # endif

214 

215 /* Clear all signals from SET.  */

216 extern int sigemptyset (sigset_t *__set) __THROW __nonnull ((1));

217 

218 /* Set all signals in SET.  */

219 extern int sigfillset (sigset_t *__set) __THROW __nonnull ((1));

220 

221 /* Add SIGNO to SET.  */

222 extern int sigaddset (sigset_t *__set, int __signo) __THROW __nonnull ((1));

223 

224 /* Remove SIGNO from SET.  */

225 extern int sigdelset (sigset_t *__set, int __signo) __THROW __nonnull ((1));

226 

227 /* Return 1 if SIGNO is in SET, 0 if not.  */

228 extern int sigismember (__const sigset_t *__set, int __signo)

229      __THROW __nonnull ((1));

230 

231 # ifdef __USE_GNU

232 /* Return non-empty value is SET is not empty.  */

233 extern int sigisemptyset (__const sigset_t *__set) __THROW __nonnull ((1));

234 

235 /* Build new signal set by combining the two inputs set using logical AND.  */

236 extern int sigandset (sigset_t *__set, __const sigset_t *__left,

237                       __const sigset_t *__right) __THROW __nonnull ((1, 2, 3));

238 

239 /* Build new signal set by combining the two inputs set using logical OR.  */

240 extern int sigorset (sigset_t *__set, __const sigset_t *__left,

241                      __const sigset_t *__right) __THROW __nonnull ((1, 2, 3));

242 # endif /* GNU */

243 

244 /* Get the system-specific definitions of `struct sigaction'

245    and the `SA_*' and `SIG_*'. constants.  */

246 # include <bits/sigaction.h>

247 

248 /* Get and/or change the set of blocked signals.  */

249 extern int sigprocmask (int __how, __const sigset_t *__restrict __set,

250                         sigset_t *__restrict __oset) __THROW;

251 

252 /* Change the set of blocked signals to SET,

253    wait until a signal arrives, and restore the set of blocked signals.

254 

255    This function is a cancellation point and therefore not marked with

256    __THROW.  */

257 extern int sigsuspend (__const sigset_t *__set) __nonnull ((1));

258 

259 /* Get and/or set the action for signal SIG.  */

260 extern int sigaction (int __sig, __const struct sigaction *__restrict __act,

261                       struct sigaction *__restrict __oact) __THROW;

262 

263 /* Put in SET all signals that are blocked and waiting to be delivered.  */

264 extern int sigpending (sigset_t *__set) __THROW __nonnull ((1));

265 

266 

267 /* Select any of pending signals from SET or wait for any to arrive.

268 

269    This function is a cancellation point and therefore not marked with

270    __THROW.  */

271 extern int sigwait (__const sigset_t *__restrict __set, int *__restrict __sig)

272      __nonnull ((1, 2));

273 

274 # ifdef __USE_POSIX199309

275 /* Select any of pending signals from SET and place information in INFO.

276 

277    This function is a cancellation point and therefore not marked with

278    __THROW.  */

279 extern int sigwaitinfo (__const sigset_t *__restrict __set,

280                         siginfo_t *__restrict __info) __nonnull ((1));

281 

282 /* Select any of pending signals from SET and place information in INFO.

283    Wait the time specified by TIMEOUT if no signal is pending.

284 

285    This function is a cancellation point and therefore not marked with

286    __THROW.  */

287 extern int sigtimedwait (__const sigset_t *__restrict __set,

288                          siginfo_t *__restrict __info,

289                          __const struct timespec *__restrict __timeout)

290      __nonnull ((1));

291 

292 /* Send signal SIG to the process PID.  Associate data in VAL with the

293    signal.  */

294 extern int sigqueue (__pid_t __pid, int __sig, __const union sigval __val)

295      __THROW;

296 # endif /* Use POSIX 199306.  */

297 

298 #endif /* Use POSIX.  */

299 

300 #ifdef __USE_BSD

301 

302 /* Names of the signals.  This variable exists only for compatibility.

303    Use `strsignal' instead (see <string.h>).  */

304 extern __const char *__const _sys_siglist[_NSIG];

305 extern __const char *__const sys_siglist[_NSIG];

306 

307 /* Structure passed to `sigvec'.  */

308 struct sigvec

309   {

310     __sighandler_t sv_handler;  /* Signal handler.  */

311     int sv_mask;                /* Mask of signals to be blocked.  */

312 

313     int sv_flags;               /* Flags (see below).  */

314 # define sv_onstack     sv_flags /* 4.2 BSD compatibility.  */

315   };

316 

317 /* Bits in `sv_flags'.  */

318 # define SV_ONSTACK     (1 << 0)/* Take the signal on the signal stack.  */

319 # define SV_INTERRUPT   (1 << 1)/* Do not restart system calls.  */

320 # define SV_RESETHAND   (1 << 2)/* Reset handler to SIG_DFL on receipt.  */

321 

322 

323 /* If VEC is non-NULL, set the handler for SIG to the `sv_handler' member

324    of VEC.  The signals in `sv_mask' will be blocked while the handler runs.

325    If the SV_RESETHAND bit is set in `sv_flags', the handler for SIG will be

326    reset to SIG_DFL before `sv_handler' is entered.  If OVEC is non-NULL,

327    it is filled in with the old information for SIG.  */

328 extern int sigvec (int __sig, __const struct sigvec *__vec,

329                    struct sigvec *__ovec) __THROW;

330 

331 

332 /* Get machine-dependent `struct sigcontext' and signal subcodes.  */

333 # include <bits/sigcontext.h>

334 

335 /* Restore the state saved in SCP.  */

336 extern int sigreturn (struct sigcontext *__scp) __THROW;

337 

338 #endif /*  use BSD.  */

339 

340 

341 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED

342 

343 /* If INTERRUPT is nonzero, make signal SIG interrupt system calls

344    (causing them to fail with EINTR); if INTERRUPT is zero, make system

345    calls be restarted after signal SIG.  */

346 extern int siginterrupt (int __sig, int __interrupt) __THROW;

347 

348 # include <bits/sigstack.h>

349 # ifdef __USE_XOPEN

350 /* This will define `ucontext_t' and `mcontext_t'.  */

351 #  include <sys/ucontext.h>

352 # endif

353 

354 /* Run signals handlers on the stack specified by SS (if not NULL).

355    If OSS is not NULL, it is filled in with the old signal stack status.

356    This interface is obsolete and on many platform not implemented.  */

357 extern int sigstack (struct sigstack *__ss, struct sigstack *__oss)

358      __THROW __attribute_deprecated__;

359 

360 /* Alternate signal handler stack interface.

361    This interface should always be preferred over `sigstack'.  */

362 extern int sigaltstack (__const struct sigaltstack *__restrict __ss,

363                         struct sigaltstack *__restrict __oss) __THROW;

364 

365 #endif /* use BSD or X/Open Unix.  */

366 

367 #ifdef __USE_XOPEN_EXTENDED

368 /* Simplified interface for signal management.  */

369 

370 /* Add SIG to the calling process' signal mask.  */

371 extern int sighold (int __sig) __THROW;

372 

373 /* Remove SIG from the calling process' signal mask.  */

374 extern int sigrelse (int __sig) __THROW;

375 

376 /* Set the disposition of SIG to SIG_IGN.  */

377 extern int sigignore (int __sig) __THROW;

378 

379 /* Set the disposition of SIG.  */

380 extern __sighandler_t sigset (int __sig, __sighandler_t __disp) __THROW;

381 #endif

382 

383 #if defined __USE_POSIX199506 || defined __USE_UNIX98

384 /* Some of the functions for handling signals in threaded programs must

385    be defined here.  */

386 # include <bits/pthreadtypes.h>

387 # include <bits/sigthread.h>

388 #endif /* use Unix98 */

389 

390 /* The following functions are used internally in the C library and in

391    other code which need deep insights.  */

392 

393 /* Return number of available real-time signal with highest priority.  */

394 extern int __libc_current_sigrtmin (void) __THROW;

395 /* Return number of available real-time signal with lowest priority.  */

396 extern int __libc_current_sigrtmax (void) __THROW;

397 

398 #endif /* signal.h  */

399 

400 __END_DECLS

401 

402 #endif /* not signal.h */

 

linux@ubuntu:/$ kill -l

 1) SIGHUP     2) SIGINT     3) SIGQUIT     4) SIGILL     5) SIGTRAP

 6) SIGABRT     7) SIGBUS     8) SIGFPE     9) SIGKILL    10) SIGUSR1

11) SIGSEGV    12) SIGUSR2    13) SIGPIPE    14) SIGALRM    15) SIGTERM

16) SIGSTKFLT    17) SIGCHLD    18) SIGCONT    19) SIGSTOP    20) SIGTSTP

21) SIGTTIN    22) SIGTTOU    23) SIGURG    24) SIGXCPU    25) SIGXFSZ

26) SIGVTALRM    27) SIGPROF    28) SIGWINCH    29) SIGIO    30) SIGPWR

31) SIGSYS    34) SIGRTMIN    35) SIGRTMIN+1    36) SIGRTMIN+2    37) SIGRTMIN+3

38) SIGRTMIN+4    39) SIGRTMIN+5    40) SIGRTMIN+6    41) SIGRTMIN+7    42) SIGRTMIN+8

43) SIGRTMIN+9    44) SIGRTMIN+10    45) SIGRTMIN+11    46) SIGRTMIN+12    47) SIGRTMIN+13

48) SIGRTMIN+14    49) SIGRTMIN+15    50) SIGRTMAX-14    51) SIGRTMAX-13    52) SIGRTMAX-12

53) SIGRTMAX-11    54) SIGRTMAX-10    55) SIGRTMAX-9    56) SIGRTMAX-8    57) SIGRTMAX-7

58) SIGRTMAX-6    59) SIGRTMAX-5    60) SIGRTMAX-4    61) SIGRTMAX-3    62) SIGRTMAX-2

63) SIGRTMAX-1    64) SIGRTMAX    

这个是内核支持的信号