aboutsummaryrefslogtreecommitdiff
path: root/libjava/posix.cc
blob: 5d64094c815a19610e25a28f33bf406901dbc534 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
// posix.cc -- Helper functions for POSIX-flavored OSs.

/* Copyright (C) 2000, 2001, 2002, 2006  Free Software Foundation

   This file is part of libgcj.

This software is copyrighted work licensed under the terms of the
Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
details.  */

#include <config.h>

#include "posix.h"

#include <stdlib.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>

#ifdef HAVE_DLFCN_H
#include <dlfcn.h>
#endif

#include <jvm.h>
#include <java-stack.h>
#include <java/lang/Thread.h>
#include <java/io/InterruptedIOException.h>
#include <java/util/Properties.h>

#if defined (ECOS)
extern "C" unsigned long long _clock (void);
#endif

#if defined(HAVE_PROC_SELF_EXE)
static char exec_name[20];
  // initialized in _Jv_platform_initialize()
#endif

const char *_Jv_ThisExecutable (void)
{
#if defined(DISABLE_MAIN_ARGS)
  return "[Embedded App]";
#elif defined(HAVE_PROC_SELF_EXE)
  return exec_name;
    // initialized in _Jv_platform_initialize()
#else
  return _Jv_GetSafeArg (0);
#endif
}

// gettimeofday implementation.
jlong
_Jv_platform_gettimeofday ()
{
#if defined (HAVE_GETTIMEOFDAY)
  timeval tv;
  gettimeofday (&tv, NULL);
  return (tv.tv_sec * 1000LL) + (tv.tv_usec / 1000LL);
#elif defined (HAVE_TIME)
  return time (NULL) * 1000LL;
#elif defined (HAVE_FTIME)
  struct timeb t;
  ftime (&t);
  return (t.time * 1000LL) + t.millitm;
#elif defined (ECOS)
  // FIXME.
  return _clock();
#else
  // In the absence of any function, time remains forever fixed.
  return 23000;
#endif
}

jlong
_Jv_platform_nanotime ()
{
#ifdef HAVE_CLOCK_GETTIME
  struct timespec now;
  clockid_t id;
#ifdef CLOCK_MONOTONIC
  id = CLOCK_MONOTONIC;
#elif defined (CLOCK_HIGHRES)
  id = CLOCK_HIGHRES;
#else
  id = CLOCK_REALTIME;
#endif
  if (clock_gettime (id, &now) == 0)
    {
      jlong result = (jlong) now.tv_sec;
      result = result * 1000000000LL + now.tv_nsec;
      return result;
    }
  // clock_gettime failed, but we can fall through.
#endif // HAVE_CLOCK_GETTIME
#if defined (HAVE_GETTIMEOFDAY)
 {
   timeval tv;
   gettimeofday (&tv, NULL);
   return (tv.tv_sec * 1000000000LL) + tv.tv_usec * 1000LL;
 }
#else
  return _Jv_platform_gettimeofday () * 1000000LL;
#endif
}

// Platform-specific VM initialization.
void
_Jv_platform_initialize (void)
{
#if defined (HAVE_SIGACTION)
  // We only want this on POSIX systems.
  struct sigaction act;
  act.sa_handler = SIG_IGN;
  sigemptyset (&act.sa_mask);
  act.sa_flags = 0;
  sigaction (SIGPIPE, &act, NULL);
#else
  signal (SIGPIPE, SIG_IGN);
#endif

#if defined (HAVE_PROC_SELF_EXE)
  // Compute our executable name
  sprintf (exec_name, "/proc/%d/exe", getpid ());
#endif
}

// Set platform-specific System properties.
void
_Jv_platform_initProperties (java::util::Properties* newprops)
{
  // A convenience define.
#define SET(Prop,Val) \
  newprops->put(JvNewStringLatin1 (Prop), JvNewStringLatin1 (Val))

  SET ("file.separator", "/");
  SET ("path.separator", ":");
  SET ("line.separator", "\n");
  const char *tmpdir = ::getenv("TMPDIR");
  if (! tmpdir)
    tmpdir = "/tmp";
  SET ("java.io.tmpdir", tmpdir);
  const char *zoneinfodir = ::getenv("TZDATA");
  if (! zoneinfodir)
    zoneinfodir = "/usr/share/zoneinfo";
  SET ("gnu.java.util.zoneinfo.dir", zoneinfodir);
}

static inline void
internal_gettimeofday (struct timeval *result)
{
#if defined (HAVE_GETTIMEOFDAY)
  gettimeofday (result, NULL);
#else
  jlong val = _Jv_platform_gettimeofday ();
  result->tv_sec = val / 1000;
  result->tv_usec = (val % 1000) * 1000;
#endif /* HAVE_GETTIMEOFDAY */
}

// A wrapper for select() which ignores EINTR.
int
_Jv_select (int n, fd_set *readfds, fd_set  *writefds,
	    fd_set *exceptfds, struct timeval *timeout)
{
#ifdef HAVE_SELECT
  // If we have a timeout, compute the absolute ending time.
  struct timeval end, delay;
  if (timeout)
    {
      internal_gettimeofday (&end);
      end.tv_usec += timeout->tv_usec;
      if (end.tv_usec >= 1000000)
	{
	  ++end.tv_sec;
	  end.tv_usec -= 1000000;
	}
      end.tv_sec += timeout->tv_sec;
      delay = *timeout;
    }
  else
    {
      // Placate compiler.
      delay.tv_sec = delay.tv_usec = 0;
    }

  while (1)
    {
      int r = select (n, readfds, writefds, exceptfds,
		      timeout ? &delay : NULL);
      if (r != -1 || errno != EINTR)
	return r;

      // Here we know we got EINTR.
      if (java::lang::Thread::interrupted ())
	throw new java::io::InterruptedIOException (JvNewStringLatin1 ("select interrupted"));

      struct timeval after;
      if (timeout)
	{
	  internal_gettimeofday (&after);
	  // Now compute new timeout argument.
	  delay.tv_usec = end.tv_usec - after.tv_usec;
	  delay.tv_sec = end.tv_sec - after.tv_sec;
	  if (delay.tv_usec < 0)
	    {
	      --delay.tv_sec;
	      delay.tv_usec += 1000000;
	    }
	  if (delay.tv_sec < 0)
	    {
	      // We assume that the user wants a valid select() call
	      // more than precise timing.  So if we get a series of
	      // EINTR we just keep trying with delay 0 until we get a
	      // valid result.
	      delay.tv_sec = 0;
	    }
	}
    }
#else /* HAVE_SELECT */
  return 0;
#endif
}

// Given an address, find the object that defines it and the nearest
// defined symbol to that address.  Returns 0 if no object defines this
// address.
int
_Jv_platform_dladdr (void *addr, _Jv_AddrInfo *info)
{
  int ret_val = 0;

#if defined (HAVE_DLFCN_H) && defined (HAVE_DLADDR)
  Dl_info addr_info;
  ret_val = dladdr (addr, &addr_info);
  if (ret_val != 0)
    {
      info->file_name = addr_info.dli_fname;
      info->base = addr_info.dli_fbase;
      info->sym_name = addr_info.dli_sname;
      info->sym_addr = addr_info.dli_saddr;
    }
#else
  info->file_name = NULL;
  info->base = NULL;
  info->sym_name = NULL;
  info->sym_addr = NULL;
#endif

  return ret_val;
}