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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [runtime/] [go-signal.c] - Blame information for rev 747

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/* go-signal.c -- signal handling for Go.
 
   Copyright 2009 The Go Authors. All rights reserved.
   Use of this source code is governed by a BSD-style
   license that can be found in the LICENSE file.  */
 
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/time.h>
 
#include "runtime.h"
#include "go-assert.h"
#include "go-panic.h"
 
#ifndef SA_RESTART
  #define SA_RESTART 0
#endif
 
#ifdef USING_SPLIT_STACK
 
extern void __splitstack_getcontext(void *context[10]);
 
extern void __splitstack_setcontext(void *context[10]);
 
#endif
 
#define C SigCatch
#define I SigIgnore
#define R SigRestart
#define Q SigQueue
#define P SigPanic
 
/* Signal actions.  This collects the sigtab tables for several
   different targets from the master library.  SIGKILL, SIGCONT, and
   SIGSTOP are not listed, as we don't want to set signal handlers for
   them.  */
 
SigTab runtime_sigtab[] = {
#ifdef SIGHUP
  { SIGHUP,     Q + R },
#endif
#ifdef SIGINT
  { SIGINT,     Q + R },
#endif
#ifdef SIGQUIT
  { SIGQUIT,    C },
#endif
#ifdef SIGILL
  { SIGILL,     C },
#endif
#ifdef SIGTRAP
  { SIGTRAP,    C },
#endif
#ifdef SIGABRT
  { SIGABRT,    C },
#endif
#ifdef SIGBUS
  { SIGBUS,     C + P },
#endif
#ifdef SIGFPE
  { SIGFPE,     C + P },
#endif
#ifdef SIGUSR1
  { SIGUSR1,    Q + I + R },
#endif
#ifdef SIGSEGV
  { SIGSEGV,    C + P },
#endif
#ifdef SIGUSR2
  { SIGUSR2,    Q + I + R },
#endif
#ifdef SIGPIPE
  { SIGPIPE,    I },
#endif
#ifdef SIGALRM
  { SIGALRM,    Q + I + R },
#endif
#ifdef SIGTERM
  { SIGTERM,    Q + R },
#endif
#ifdef SIGSTKFLT
  { SIGSTKFLT,  C },
#endif
#ifdef SIGCHLD
  { SIGCHLD,    Q + I + R },
#endif
#ifdef SIGTSTP
  { SIGTSTP,    Q + I + R },
#endif
#ifdef SIGTTIN
  { SIGTTIN,    Q + I + R },
#endif
#ifdef SIGTTOU
  { SIGTTOU,    Q + I + R },
#endif
#ifdef SIGURG
  { SIGURG,     Q + I + R },
#endif
#ifdef SIGXCPU
  { SIGXCPU,    Q + I + R },
#endif
#ifdef SIGXFSZ
  { SIGXFSZ,    Q + I + R },
#endif
#ifdef SIGVTALRM
  { SIGVTALRM,  Q + I + R },
#endif
#ifdef SIGPROF
  { SIGPROF,    Q + I + R },
#endif
#ifdef SIGWINCH
  { SIGWINCH,   Q + I + R },
#endif
#ifdef SIGIO
  { SIGIO,      Q + I + R },
#endif
#ifdef SIGPWR
  { SIGPWR,     Q + I + R },
#endif
#ifdef SIGSYS
  { SIGSYS,     C },
#endif
#ifdef SIGEMT
  { SIGEMT,     C },
#endif
#ifdef SIGINFO
  { SIGINFO,    Q + I + R },
#endif
#ifdef SIGTHR
  { SIGTHR,     Q + I + R },
#endif
  { -1,         0 }
};
#undef C
#undef I
#undef R
#undef Q
#undef P
 
/* Handle a signal, for cases where we don't panic.  We can split the
   stack here.  */
 
static void
sig_handler (int sig)
{
  int i;
 
#ifdef SIGPROF
  if (sig == SIGPROF)
    {
      /* FIXME.  */
      runtime_sigprof (0, 0, nil, nil);
      return;
    }
#endif
 
  for (i = 0; runtime_sigtab[i].sig != -1; ++i)
    {
      struct sigaction sa;
 
      if (runtime_sigtab[i].sig != sig)
        continue;
 
      if ((runtime_sigtab[i].flags & SigQueue) != 0)
        {
          if (__go_sigsend (sig)
              || (runtime_sigtab[sig].flags & SigIgnore) != 0)
            return;
          runtime_exit (2);             // SIGINT, SIGTERM, etc
        }
 
      if (runtime_panicking)
        runtime_exit (2);
      runtime_panicking = 1;
 
      /* We should do a stack backtrace here.  Until we can do that,
         we reraise the signal in order to get a slightly better
         report from the shell.  */
 
      memset (&sa, 0, sizeof sa);
 
      sa.sa_handler = SIG_DFL;
 
      i = sigemptyset (&sa.sa_mask);
      __go_assert (i == 0);
 
      if (sigaction (sig, &sa, NULL) != 0)
        abort ();
 
      raise (sig);
 
      runtime_exit (2);
    }
 
  __builtin_unreachable ();
}
 
/* The start of handling a signal which panics.  */
 
static void
sig_panic_leadin (int sig)
{
  int i;
  sigset_t clear;
 
  if (runtime_m ()->mallocing)
    {
      runtime_printf ("caught signal while mallocing: %d\n", sig);
      runtime_throw ("caught signal while mallocing");
    }
 
  /* The signal handler blocked signals; unblock them.  */
  i = sigfillset (&clear);
  __go_assert (i == 0);
  i = sigprocmask (SIG_UNBLOCK, &clear, NULL);
  __go_assert (i == 0);
}
 
#ifdef SA_SIGINFO
 
/* Signal dispatch for signals which panic, on systems which support
   SA_SIGINFO.  This is called on the thread stack, and as such it is
   permitted to split the stack.  */
 
static void
sig_panic_info_handler (int sig, siginfo_t *info,
                        void *context __attribute__ ((unused)))
{
  if (runtime_g () == NULL)
    {
      sig_handler (sig);
      return;
    }
 
  sig_panic_leadin (sig);
 
  switch (sig)
    {
#ifdef SIGBUS
    case SIGBUS:
      if (info->si_code == BUS_ADRERR && (uintptr_t) info->si_addr < 0x1000)
        runtime_panicstring ("invalid memory address or "
                             "nil pointer dereference");
      runtime_printf ("unexpected fault address %p\n", info->si_addr);
      runtime_throw ("fault");
#endif
 
#ifdef SIGSEGV
    case SIGSEGV:
      if ((info->si_code == 0
           || info->si_code == SEGV_MAPERR
           || info->si_code == SEGV_ACCERR)
          && (uintptr_t) info->si_addr < 0x1000)
        runtime_panicstring ("invalid memory address or "
                             "nil pointer dereference");
      runtime_printf ("unexpected fault address %p\n", info->si_addr);
      runtime_throw ("fault");
#endif
 
#ifdef SIGFPE
    case SIGFPE:
      switch (info->si_code)
        {
        case FPE_INTDIV:
          runtime_panicstring ("integer divide by zero");
        case FPE_INTOVF:
          runtime_panicstring ("integer overflow");
        }
      runtime_panicstring ("floating point error");
#endif
    }
 
  /* All signals with SigPanic should be in cases above, and this
     handler should only be invoked for those signals.  */
  __builtin_unreachable ();
}
 
#else /* !defined (SA_SIGINFO) */
 
static void
sig_panic_handler (int sig)
{
  if (runtime_g () == NULL)
    {
      sig_handler (sig);
      return;
    }
 
  sig_panic_leadin (sig);
 
  switch (sig)
    {
#ifdef SIGBUS
    case SIGBUS:
      runtime_panicstring ("invalid memory address or "
                           "nil pointer dereference");
#endif
 
#ifdef SIGSEGV
    case SIGSEGV:
      runtime_panicstring ("invalid memory address or "
                           "nil pointer dereference");
#endif
 
#ifdef SIGFPE
    case SIGFPE:
      runtime_panicstring ("integer divide by zero or floating point error");
#endif
    }
 
  /* All signals with SigPanic should be in cases above, and this
     handler should only be invoked for those signals.  */
  __builtin_unreachable ();
}
 
#endif /* !defined (SA_SIGINFO) */
 
/* Ignore a signal.  This is called on the alternate signal stack so
   it may not split the stack.  */
 
static void sig_ignore (int) __attribute__ ((no_split_stack));
 
static void
sig_ignore (int sig __attribute__ ((unused)))
{
}
 
/* A signal handler used for signals which are not going to panic.
   This is called on the alternate signal stack so it may not split
   the stack.  */
 
static void
sig_tramp (int) __attribute__ ((no_split_stack));
 
static void
sig_tramp (int sig)
{
  G *gp;
  M *mp;
 
  /* We are now running on the stack registered via sigaltstack.
     (Actually there is a small span of time between runtime_siginit
     and sigaltstack when the program starts.)  */
  gp = runtime_g ();
  mp = runtime_m ();
 
  if (gp != NULL)
    {
#ifdef USING_SPLIT_STACK
      __splitstack_getcontext (&gp->stack_context[0]);
#endif
    }
 
  if (gp != NULL && mp->gsignal != NULL)
    {
      /* We are running on the signal stack.  Set the split stack
         context so that the stack guards are checked correctly.  */
#ifdef USING_SPLIT_STACK
      __splitstack_setcontext (&mp->gsignal->stack_context[0]);
#endif
    }
 
  sig_handler (sig);
 
  /* We are going to return back to the signal trampoline and then to
     whatever we were doing before we got the signal.  Restore the
     split stack context so that stack guards are checked
     correctly.  */
 
  if (gp != NULL)
    {
#ifdef USING_SPLIT_STACK
      __splitstack_setcontext (&gp->stack_context[0]);
#endif
    }
}
 
/* Initialize signal handling for Go.  This is called when the program
   starts.  */
 
void
runtime_initsig (int32 queue)
{
  struct sigaction sa;
  int i;
 
  siginit ();
 
  memset (&sa, 0, sizeof sa);
 
  i = sigfillset (&sa.sa_mask);
  __go_assert (i == 0);
 
  for (i = 0; runtime_sigtab[i].sig != -1; ++i)
    {
      if (runtime_sigtab[i].flags == 0)
        continue;
      if ((runtime_sigtab[i].flags & SigQueue) != queue)
        continue;
 
      if ((runtime_sigtab[i].flags & (SigCatch | SigQueue)) != 0)
        {
          if ((runtime_sigtab[i].flags & SigPanic) == 0)
            {
              sa.sa_flags = SA_ONSTACK;
              sa.sa_handler = sig_tramp;
            }
          else
            {
#ifdef SA_SIGINFO
              sa.sa_flags = SA_SIGINFO;
              sa.sa_sigaction = sig_panic_info_handler;
#else
              sa.sa_flags = 0;
              sa.sa_handler = sig_panic_handler;
#endif
            }
        }
      else
        {
          sa.sa_flags = SA_ONSTACK;
          sa.sa_handler = sig_ignore;
        }
 
      if ((runtime_sigtab[i].flags & SigRestart) != 0)
        sa.sa_flags |= SA_RESTART;
 
      if (sigaction (runtime_sigtab[i].sig, &sa, NULL) != 0)
        __go_assert (0);
    }
}
 
void
runtime_resetcpuprofiler(int32 hz)
{
#ifdef SIGPROF
  struct itimerval it;
  struct sigaction sa;
  int i;
 
  memset (&it, 0, sizeof it);
 
  memset (&sa, 0, sizeof sa);
  i = sigfillset (&sa.sa_mask);
  __go_assert (i == 0);
 
  if (hz == 0)
    {
      i = setitimer (ITIMER_PROF, &it, NULL);
      __go_assert (i == 0);
 
      sa.sa_handler = SIG_IGN;
      i = sigaction (SIGPROF, &sa, NULL);
      __go_assert (i == 0);
    }
  else
    {
      sa.sa_handler = sig_handler;
      sa.sa_flags = SA_RESTART;
      i = sigaction (SIGPROF, &sa, NULL);
      __go_assert (i == 0);
 
      it.it_interval.tv_sec = 0;
      it.it_interval.tv_usec = 1000000 / hz;
      it.it_value = it.it_interval;
      i = setitimer (ITIMER_PROF, &it, NULL);
      __go_assert (i == 0);
    }
#endif
 
  runtime_m()->profilehz = hz;
}
 
/* Used by the os package to raise SIGPIPE.  */
 
void os_sigpipe (void) __asm__ ("libgo_os.os.sigpipe");
 
void
os_sigpipe (void)
{
  struct sigaction sa;
  int i;
 
  memset (&sa, 0, sizeof sa);
 
  sa.sa_handler = SIG_DFL;
 
  i = sigemptyset (&sa.sa_mask);
  __go_assert (i == 0);
 
  if (sigaction (SIGPIPE, &sa, NULL) != 0)
    abort ();
 
  raise (SIGPIPE);
}

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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [runtime/] [go-signal.c] - Blame information for rev 747

Line No.	Rev	Author	Line
1	747	jeremybenn	`/* go-signal.c -- signal handling for Go.`
2
3			`Copyright 2009 The Go Authors. All rights reserved.`
4			`Use of this source code is governed by a BSD-style`
5			`license that can be found in the LICENSE file. */`
6
7			`#include <signal.h>`
8			`#include <stdlib.h>`
9			`#include <unistd.h>`
10			`#include <sys/time.h>`
11
12			`#include "runtime.h"`
13			`#include "go-assert.h"`
14			`#include "go-panic.h"`
15
16			`#ifndef SA_RESTART`
17			`#define SA_RESTART 0`
18			`#endif`
19
20			`#ifdef USING_SPLIT_STACK`
21
22			`extern void __splitstack_getcontext(void *context[10]);`
23
24			`extern void __splitstack_setcontext(void *context[10]);`
25
26			`#endif`
27
28			`#define C SigCatch`
29			`#define I SigIgnore`
30			`#define R SigRestart`
31			`#define Q SigQueue`
32			`#define P SigPanic`
33
34			`/* Signal actions. This collects the sigtab tables for several`
35			`different targets from the master library. SIGKILL, SIGCONT, and`
36			`SIGSTOP are not listed, as we don't want to set signal handlers for`
37			`them. */`
38
39			`SigTab runtime_sigtab[] = {`
40			`#ifdef SIGHUP`
41			`{ SIGHUP, Q + R },`
42			`#endif`
43			`#ifdef SIGINT`
44			`{ SIGINT, Q + R },`
45			`#endif`
46			`#ifdef SIGQUIT`
47			`{ SIGQUIT, C },`
48			`#endif`
49			`#ifdef SIGILL`
50			`{ SIGILL, C },`
51			`#endif`
52			`#ifdef SIGTRAP`
53			`{ SIGTRAP, C },`
54			`#endif`
55			`#ifdef SIGABRT`
56			`{ SIGABRT, C },`
57			`#endif`
58			`#ifdef SIGBUS`
59			`{ SIGBUS, C + P },`
60			`#endif`
61			`#ifdef SIGFPE`
62			`{ SIGFPE, C + P },`
63			`#endif`
64			`#ifdef SIGUSR1`
65			`{ SIGUSR1, Q + I + R },`
66			`#endif`
67			`#ifdef SIGSEGV`
68			`{ SIGSEGV, C + P },`
69			`#endif`
70			`#ifdef SIGUSR2`
71			`{ SIGUSR2, Q + I + R },`
72			`#endif`
73			`#ifdef SIGPIPE`
74			`{ SIGPIPE, I },`
75			`#endif`
76			`#ifdef SIGALRM`
77			`{ SIGALRM, Q + I + R },`
78			`#endif`
79			`#ifdef SIGTERM`
80			`{ SIGTERM, Q + R },`
81			`#endif`
82			`#ifdef SIGSTKFLT`
83			`{ SIGSTKFLT, C },`
84			`#endif`
85			`#ifdef SIGCHLD`
86			`{ SIGCHLD, Q + I + R },`
87			`#endif`
88			`#ifdef SIGTSTP`
89			`{ SIGTSTP, Q + I + R },`
90			`#endif`
91			`#ifdef SIGTTIN`
92			`{ SIGTTIN, Q + I + R },`
93			`#endif`
94			`#ifdef SIGTTOU`
95			`{ SIGTTOU, Q + I + R },`
96			`#endif`
97			`#ifdef SIGURG`
98			`{ SIGURG, Q + I + R },`
99			`#endif`
100			`#ifdef SIGXCPU`
101			`{ SIGXCPU, Q + I + R },`
102			`#endif`
103			`#ifdef SIGXFSZ`
104			`{ SIGXFSZ, Q + I + R },`
105			`#endif`
106			`#ifdef SIGVTALRM`
107			`{ SIGVTALRM, Q + I + R },`
108			`#endif`
109			`#ifdef SIGPROF`
110			`{ SIGPROF, Q + I + R },`
111			`#endif`
112			`#ifdef SIGWINCH`
113			`{ SIGWINCH, Q + I + R },`
114			`#endif`
115			`#ifdef SIGIO`
116			`{ SIGIO, Q + I + R },`
117			`#endif`
118			`#ifdef SIGPWR`
119			`{ SIGPWR, Q + I + R },`
120			`#endif`
121			`#ifdef SIGSYS`
122			`{ SIGSYS, C },`
123			`#endif`
124			`#ifdef SIGEMT`
125			`{ SIGEMT, C },`
126			`#endif`
127			`#ifdef SIGINFO`
128			`{ SIGINFO, Q + I + R },`
129			`#endif`
130			`#ifdef SIGTHR`
131			`{ SIGTHR, Q + I + R },`
132			`#endif`
133			`{ -1, 0 }`
134			`};`
135			`#undef C`
136			`#undef I`
137			`#undef R`
138			`#undef Q`
139			`#undef P`
140
141			`/* Handle a signal, for cases where we don't panic. We can split the`
142			`stack here. */`
143
144			`static void`
145			`sig_handler (int sig)`
146			`{`
147			`int i;`
148
149			`#ifdef SIGPROF`
150			`if (sig == SIGPROF)`
151			`{`
152			`/* FIXME. */`
153			`runtime_sigprof (0, 0, nil, nil);`
154			`return;`
155			`}`
156			`#endif`
157
158			`for (i = 0; runtime_sigtab[i].sig != -1; ++i)`
159			`{`
160			`struct sigaction sa;`
161
162			`if (runtime_sigtab[i].sig != sig)`
163			`continue;`
164
165			`if ((runtime_sigtab[i].flags & SigQueue) != 0)`
166			`{`
167			`if (__go_sigsend (sig)`
168			`\|\| (runtime_sigtab[sig].flags & SigIgnore) != 0)`
169			`return;`
170			`runtime_exit (2); // SIGINT, SIGTERM, etc`
171			`}`
172
173			`if (runtime_panicking)`
174			`runtime_exit (2);`
175			`runtime_panicking = 1;`
176
177			`/* We should do a stack backtrace here. Until we can do that,`
178			`we reraise the signal in order to get a slightly better`
179			`report from the shell. */`
180
181			`memset (&sa, 0, sizeof sa);`
182
183			`sa.sa_handler = SIG_DFL;`
184
185			`i = sigemptyset (&sa.sa_mask);`
186			`__go_assert (i == 0);`
187
188			`if (sigaction (sig, &sa, NULL) != 0)`
189			`abort ();`
190
191			`raise (sig);`
192
193			`runtime_exit (2);`
194			`}`
195
196			`__builtin_unreachable ();`
197			`}`
198
199			`/* The start of handling a signal which panics. */`
200
201			`static void`
202			`sig_panic_leadin (int sig)`
203			`{`
204			`int i;`
205			`sigset_t clear;`
206
207			`if (runtime_m ()->mallocing)`
208			`{`
209			`runtime_printf ("caught signal while mallocing: %d\n", sig);`
210			`runtime_throw ("caught signal while mallocing");`
211			`}`
212
213			`/* The signal handler blocked signals; unblock them. */`
214			`i = sigfillset (&clear);`
215			`__go_assert (i == 0);`
216			`i = sigprocmask (SIG_UNBLOCK, &clear, NULL);`
217			`__go_assert (i == 0);`
218			`}`
219
220			`#ifdef SA_SIGINFO`
221
222			`/* Signal dispatch for signals which panic, on systems which support`
223			`SA_SIGINFO. This is called on the thread stack, and as such it is`
224			`permitted to split the stack. */`
225
226			`static void`
227			`sig_panic_info_handler (int sig, siginfo_t *info,`
228			`void *context __attribute__ ((unused)))`
229			`{`
230			`if (runtime_g () == NULL)`
231			`{`
232			`sig_handler (sig);`
233			`return;`
234			`}`
235
236			`sig_panic_leadin (sig);`
237
238			`switch (sig)`
239			`{`
240			`#ifdef SIGBUS`
241			`case SIGBUS:`
242			`if (info->si_code == BUS_ADRERR && (uintptr_t) info->si_addr < 0x1000)`
243			`runtime_panicstring ("invalid memory address or "`
244			`"nil pointer dereference");`
245			`runtime_printf ("unexpected fault address %p\n", info->si_addr);`
246			`runtime_throw ("fault");`
247			`#endif`
248
249			`#ifdef SIGSEGV`
250			`case SIGSEGV:`
251			`if ((info->si_code == 0`
252			`\|\| info->si_code == SEGV_MAPERR`
253			`\|\| info->si_code == SEGV_ACCERR)`
254			`&& (uintptr_t) info->si_addr < 0x1000)`
255			`runtime_panicstring ("invalid memory address or "`
256			`"nil pointer dereference");`
257			`runtime_printf ("unexpected fault address %p\n", info->si_addr);`
258			`runtime_throw ("fault");`
259			`#endif`
260
261			`#ifdef SIGFPE`
262			`case SIGFPE:`
263			`switch (info->si_code)`
264			`{`
265			`case FPE_INTDIV:`
266			`runtime_panicstring ("integer divide by zero");`
267			`case FPE_INTOVF:`
268			`runtime_panicstring ("integer overflow");`
269			`}`
270			`runtime_panicstring ("floating point error");`
271			`#endif`
272			`}`
273
274			`/* All signals with SigPanic should be in cases above, and this`
275			`handler should only be invoked for those signals. */`
276			`__builtin_unreachable ();`
277			`}`
278
279			`#else /* !defined (SA_SIGINFO) */`
280
281			`static void`
282			`sig_panic_handler (int sig)`
283			`{`
284			`if (runtime_g () == NULL)`
285			`{`
286			`sig_handler (sig);`
287			`return;`
288			`}`
289
290			`sig_panic_leadin (sig);`
291
292			`switch (sig)`
293			`{`
294			`#ifdef SIGBUS`
295			`case SIGBUS:`
296			`runtime_panicstring ("invalid memory address or "`
297			`"nil pointer dereference");`
298			`#endif`
299
300			`#ifdef SIGSEGV`
301			`case SIGSEGV:`
302			`runtime_panicstring ("invalid memory address or "`
303			`"nil pointer dereference");`
304			`#endif`
305
306			`#ifdef SIGFPE`
307			`case SIGFPE:`
308			`runtime_panicstring ("integer divide by zero or floating point error");`
309			`#endif`
310			`}`
311
312			`/* All signals with SigPanic should be in cases above, and this`
313			`handler should only be invoked for those signals. */`
314			`__builtin_unreachable ();`
315			`}`
316
317			`#endif /* !defined (SA_SIGINFO) */`
318
319			`/* Ignore a signal. This is called on the alternate signal stack so`
320			`it may not split the stack. */`
321
322			`static void sig_ignore (int) __attribute__ ((no_split_stack));`
323
324			`static void`
325			`sig_ignore (int sig __attribute__ ((unused)))`
326			`{`
327			`}`
328
329			`/* A signal handler used for signals which are not going to panic.`
330			`This is called on the alternate signal stack so it may not split`
331			`the stack. */`
332
333			`static void`
334			`sig_tramp (int) __attribute__ ((no_split_stack));`
335
336			`static void`
337			`sig_tramp (int sig)`
338			`{`
339			`G *gp;`
340			`M *mp;`
341
342			`/* We are now running on the stack registered via sigaltstack.`
343			`(Actually there is a small span of time between runtime_siginit`
344			`and sigaltstack when the program starts.) */`
345			`gp = runtime_g ();`
346			`mp = runtime_m ();`
347
348			`if (gp != NULL)`
349			`{`
350			`#ifdef USING_SPLIT_STACK`
351			`__splitstack_getcontext (&gp->stack_context[0]);`
352			`#endif`
353			`}`
354
355			`if (gp != NULL && mp->gsignal != NULL)`
356			`{`
357			`/* We are running on the signal stack. Set the split stack`
358			`context so that the stack guards are checked correctly. */`
359			`#ifdef USING_SPLIT_STACK`
360			`__splitstack_setcontext (&mp->gsignal->stack_context[0]);`
361			`#endif`
362			`}`
363
364			`sig_handler (sig);`
365
366			`/* We are going to return back to the signal trampoline and then to`
367			`whatever we were doing before we got the signal. Restore the`
368			`split stack context so that stack guards are checked`
369			`correctly. */`
370
371			`if (gp != NULL)`
372			`{`
373			`#ifdef USING_SPLIT_STACK`
374			`__splitstack_setcontext (&gp->stack_context[0]);`
375			`#endif`
376			`}`
377			`}`
378
379			`/* Initialize signal handling for Go. This is called when the program`
380			`starts. */`
381
382			`void`
383			`runtime_initsig (int32 queue)`
384			`{`
385			`struct sigaction sa;`
386			`int i;`
387
388			`siginit ();`
389
390			`memset (&sa, 0, sizeof sa);`
391
392			`i = sigfillset (&sa.sa_mask);`
393			`__go_assert (i == 0);`
394
395			`for (i = 0; runtime_sigtab[i].sig != -1; ++i)`
396			`{`
397			`if (runtime_sigtab[i].flags == 0)`
398			`continue;`
399			`if ((runtime_sigtab[i].flags & SigQueue) != queue)`
400			`continue;`
401
402			`if ((runtime_sigtab[i].flags & (SigCatch \| SigQueue)) != 0)`
403			`{`
404			`if ((runtime_sigtab[i].flags & SigPanic) == 0)`
405			`{`
406			`sa.sa_flags = SA_ONSTACK;`
407			`sa.sa_handler = sig_tramp;`
408			`}`
409			`else`
410			`{`
411			`#ifdef SA_SIGINFO`
412			`sa.sa_flags = SA_SIGINFO;`
413			`sa.sa_sigaction = sig_panic_info_handler;`
414			`#else`
415			`sa.sa_flags = 0;`
416			`sa.sa_handler = sig_panic_handler;`
417			`#endif`
418			`}`
419			`}`
420			`else`
421			`{`
422			`sa.sa_flags = SA_ONSTACK;`
423			`sa.sa_handler = sig_ignore;`
424			`}`
425
426			`if ((runtime_sigtab[i].flags & SigRestart) != 0)`
427			`sa.sa_flags \|= SA_RESTART;`
428
429			`if (sigaction (runtime_sigtab[i].sig, &sa, NULL) != 0)`
430			`__go_assert (0);`
431			`}`
432			`}`
433
434			`void`
435			`runtime_resetcpuprofiler(int32 hz)`
436			`{`
437			`#ifdef SIGPROF`
438			`struct itimerval it;`
439			`struct sigaction sa;`
440			`int i;`
441
442			`memset (&it, 0, sizeof it);`
443
444			`memset (&sa, 0, sizeof sa);`
445			`i = sigfillset (&sa.sa_mask);`
446			`__go_assert (i == 0);`
447
448			`if (hz == 0)`
449			`{`
450			`i = setitimer (ITIMER_PROF, &it, NULL);`
451			`__go_assert (i == 0);`
452
453			`sa.sa_handler = SIG_IGN;`
454			`i = sigaction (SIGPROF, &sa, NULL);`
455			`__go_assert (i == 0);`
456			`}`
457			`else`
458			`{`
459			`sa.sa_handler = sig_handler;`
460			`sa.sa_flags = SA_RESTART;`
461			`i = sigaction (SIGPROF, &sa, NULL);`
462			`__go_assert (i == 0);`
463
464			`it.it_interval.tv_sec = 0;`
465			`it.it_interval.tv_usec = 1000000 / hz;`
466			`it.it_value = it.it_interval;`
467			`i = setitimer (ITIMER_PROF, &it, NULL);`
468			`__go_assert (i == 0);`
469			`}`
470			`#endif`
471
472			`runtime_m()->profilehz = hz;`
473			`}`
474
475			`/* Used by the os package to raise SIGPIPE. */`
476
477			`void os_sigpipe (void) __asm__ ("libgo_os.os.sigpipe");`
478
479			`void`
480			`os_sigpipe (void)`
481			`{`
482			`struct sigaction sa;`
483			`int i;`
484
485			`memset (&sa, 0, sizeof sa);`
486
487			`sa.sa_handler = SIG_DFL;`
488
489			`i = sigemptyset (&sa.sa_mask);`
490			`__go_assert (i == 0);`
491
492			`if (sigaction (SIGPIPE, &sa, NULL) != 0)`
493			`abort ();`
494
495			`raise (SIGPIPE);`
496			`}`