1 // posix.cc -- Helper functions for POSIX-flavored OSs.
3 /* Copyright (C) 2000, 2001, 2002, 2006 Free Software Foundation
5 This file is part of libgcj.
7 This software is copyrighted work licensed under the terms of the
8 Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
25 #include <java-stack.h>
26 #include <java/lang/Thread.h>
27 #include <java/io/InterruptedIOException.h>
28 #include <java/util/Properties.h>
31 extern "C" unsigned long long _clock (void);
34 #if defined(HAVE_PROC_SELF_EXE)
35 static char exec_name[20];
36 // initialized in _Jv_platform_initialize()
39 const char *_Jv_ThisExecutable (void)
41 #if defined(DISABLE_MAIN_ARGS)
42 return "[Embedded App]";
43 #elif defined(HAVE_PROC_SELF_EXE)
45 // initialized in _Jv_platform_initialize()
47 return _Jv_GetSafeArg (0);
51 // gettimeofday implementation.
53 _Jv_platform_gettimeofday ()
55 #if defined (HAVE_GETTIMEOFDAY)
57 gettimeofday (&tv, NULL);
58 return (tv.tv_sec * 1000LL) + (tv.tv_usec / 1000LL);
59 #elif defined (HAVE_TIME)
60 return time (NULL) * 1000LL;
61 #elif defined (HAVE_FTIME)
64 return (t.time * 1000LL) + t.millitm;
69 // In the absence of any function, time remains forever fixed.
75 _Jv_platform_nanotime ()
77 #ifdef HAVE_CLOCK_GETTIME
80 #ifdef CLOCK_MONOTONIC
82 #elif defined (CLOCK_HIGHRES)
87 if (clock_gettime (id, &now) == 0)
89 jlong result = (jlong) now.tv_sec;
90 result = result * 1000 * 1000 + now.tv_nsec;
93 // clock_gettime failed, but we can fall through.
94 #endif // HAVE_CLOCK_GETTIME
95 return _Jv_platform_gettimeofday () * 1000LL;
98 // Platform-specific VM initialization.
100 _Jv_platform_initialize (void)
102 #if defined (HAVE_SIGACTION)
103 // We only want this on POSIX systems.
104 struct sigaction act;
105 act.sa_handler = SIG_IGN;
106 sigemptyset (&act.sa_mask);
108 sigaction (SIGPIPE, &act, NULL);
110 signal (SIGPIPE, SIG_IGN);
113 #if defined (HAVE_PROC_SELF_EXE)
114 // Compute our executable name
115 sprintf (exec_name, "/proc/%d/exe", getpid ());
119 // Set platform-specific System properties.
121 _Jv_platform_initProperties (java::util::Properties* newprops)
123 // A convenience define.
124 #define SET(Prop,Val) \
125 newprops->put(JvNewStringLatin1 (Prop), JvNewStringLatin1 (Val))
127 SET ("file.separator", "/");
128 SET ("path.separator", ":");
129 SET ("line.separator", "\n");
130 const char *tmpdir = ::getenv("TMPDIR");
133 SET ("java.io.tmpdir", tmpdir);
137 internal_gettimeofday (struct timeval *result)
139 #if defined (HAVE_GETTIMEOFDAY)
140 gettimeofday (result, NULL);
142 jlong val = _Jv_platform_gettimeofday ();
143 result->tv_sec = val / 1000;
144 result->tv_usec = (val % 1000) * 1000;
145 #endif /* HAVE_GETTIMEOFDAY */
148 // A wrapper for select() which ignores EINTR.
150 _Jv_select (int n, fd_set *readfds, fd_set *writefds,
151 fd_set *exceptfds, struct timeval *timeout)
154 // If we have a timeout, compute the absolute ending time.
155 struct timeval end, delay;
158 internal_gettimeofday (&end);
159 end.tv_usec += timeout->tv_usec;
160 if (end.tv_usec >= 1000000)
163 end.tv_usec -= 1000000;
165 end.tv_sec += timeout->tv_sec;
171 delay.tv_sec = delay.tv_usec = 0;
176 int r = select (n, readfds, writefds, exceptfds,
177 timeout ? &delay : NULL);
178 if (r != -1 || errno != EINTR)
181 // Here we know we got EINTR.
182 if (java::lang::Thread::interrupted ())
183 throw new java::io::InterruptedIOException (JvNewStringLatin1 ("select interrupted"));
185 struct timeval after;
188 internal_gettimeofday (&after);
189 // Now compute new timeout argument.
190 delay.tv_usec = end.tv_usec - after.tv_usec;
191 delay.tv_sec = end.tv_sec - after.tv_sec;
192 if (delay.tv_usec < 0)
195 delay.tv_usec += 1000000;
197 if (delay.tv_sec < 0)
199 // We assume that the user wants a valid select() call
200 // more than precise timing. So if we get a series of
201 // EINTR we just keep trying with delay 0 until we get a
207 #else /* HAVE_SELECT */
212 // Given an address, find the object that defines it and the nearest
213 // defined symbol to that address. Returns 0 if no object defines this
216 _Jv_platform_dladdr (void *addr, _Jv_AddrInfo *info)
220 #if defined (HAVE_DLFCN_H) && defined (HAVE_DLADDR)
222 ret_val = dladdr (addr, &addr_info);
225 info->file_name = addr_info.dli_fname;
226 info->base = addr_info.dli_fbase;
227 info->sym_name = addr_info.dli_sname;
228 info->sym_addr = addr_info.dli_saddr;
231 info->file_name = NULL;
233 info->sym_name = NULL;
234 info->sym_addr = NULL;