173 julong os::Bsd::available_memory() {
174 uint64_t available = physical_memory() >> 2;
175 #ifdef __APPLE__
176 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
177 vm_statistics64_data_t vmstat;
178 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64,
179 (host_info64_t)&vmstat, &count);
180 assert(kerr == KERN_SUCCESS,
181 "host_statistics64 failed - check mach_host_self() and count");
182 if (kerr == KERN_SUCCESS) {
183 available = vmstat.free_count * os::vm_page_size();
184 }
185 #endif
186 return available;
187 }
188
189 julong os::physical_memory() {
190 return Bsd::physical_memory();
191 }
192
193 ////////////////////////////////////////////////////////////////////////////////
194 // environment support
195
196 bool os::getenv(const char* name, char* buf, int len) {
197 const char* val = ::getenv(name);
198 if (val != NULL && strlen(val) < (size_t)len) {
199 strcpy(buf, val);
200 return true;
201 }
202 if (len > 0) buf[0] = 0; // return a null string
203 return false;
204 }
205
206
207 // Return true if user is running as root.
208
209 bool os::have_special_privileges() {
210 static bool init = false;
211 static bool privileges = false;
212 if (!init) {
213 privileges = (getuid() != geteuid()) || (getgid() != getegid());
214 init = true;
215 }
216 return privileges;
217 }
218
219
220
221 // Cpu architecture string
222 #if defined(ZERO)
223 static char cpu_arch[] = ZERO_LIBARCH;
224 #elif defined(IA64)
225 static char cpu_arch[] = "ia64";
226 #elif defined(IA32)
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173 julong os::Bsd::available_memory() {
174 uint64_t available = physical_memory() >> 2;
175 #ifdef __APPLE__
176 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
177 vm_statistics64_data_t vmstat;
178 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64,
179 (host_info64_t)&vmstat, &count);
180 assert(kerr == KERN_SUCCESS,
181 "host_statistics64 failed - check mach_host_self() and count");
182 if (kerr == KERN_SUCCESS) {
183 available = vmstat.free_count * os::vm_page_size();
184 }
185 #endif
186 return available;
187 }
188
189 julong os::physical_memory() {
190 return Bsd::physical_memory();
191 }
192
193 // Return true if user is running as root.
194
195 bool os::have_special_privileges() {
196 static bool init = false;
197 static bool privileges = false;
198 if (!init) {
199 privileges = (getuid() != geteuid()) || (getgid() != getegid());
200 init = true;
201 }
202 return privileges;
203 }
204
205
206
207 // Cpu architecture string
208 #if defined(ZERO)
209 static char cpu_arch[] = ZERO_LIBARCH;
210 #elif defined(IA64)
211 static char cpu_arch[] = "ia64";
212 #elif defined(IA32)
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