J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2003-2005 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | #include "jni.h" |
| 27 | #include "jni_util.h" |
| 28 | #include "jlong.h" |
| 29 | #include "jvm.h" |
| 30 | #include "management.h" |
| 31 | #include "com_sun_management_UnixOperatingSystem.h" |
| 32 | |
| 33 | #include <sys/types.h> |
| 34 | #include <sys/stat.h> |
| 35 | #include <sys/swap.h> |
| 36 | #include <sys/resource.h> |
| 37 | #include <sys/times.h> |
| 38 | #include <sys/sysinfo.h> |
| 39 | #include <ctype.h> |
| 40 | #include <dirent.h> |
| 41 | #include <errno.h> |
| 42 | #include <fcntl.h> |
| 43 | #include <limits.h> |
| 44 | #include <stdlib.h> |
| 45 | #include <unistd.h> |
| 46 | |
| 47 | static jlong page_size = 0; |
| 48 | |
| 49 | /* This gets us the new structured proc interfaces of 5.6 & later */ |
| 50 | /* - see comment in <sys/procfs.h> */ |
| 51 | #define _STRUCTURED_PROC 1 |
| 52 | #include <sys/procfs.h> |
| 53 | |
| 54 | static struct dirent* read_dir(DIR* dirp, struct dirent* entry) { |
| 55 | #ifdef __solaris__ |
| 56 | struct dirent* dbuf = readdir(dirp); |
| 57 | return dbuf; |
| 58 | #else /* __linux__ */ |
| 59 | struct dirent* p; |
| 60 | if (readdir_r(dirp, entry, &p) == 0) { |
| 61 | return p; |
| 62 | } else { |
| 63 | return NULL; |
| 64 | } |
| 65 | #endif |
| 66 | } |
| 67 | |
| 68 | // true = get available swap in bytes |
| 69 | // false = get total swap in bytes |
| 70 | static jlong get_total_or_available_swap_space_size(JNIEnv* env, jboolean available) { |
| 71 | #ifdef __solaris__ |
| 72 | long total, avail; |
| 73 | int nswap, i, count; |
| 74 | swaptbl_t *stbl; |
| 75 | char *strtab; |
| 76 | |
| 77 | // First get the number of swap resource entries |
| 78 | if ((nswap = swapctl(SC_GETNSWP, NULL)) == -1) { |
| 79 | throw_internal_error(env, "swapctl failed to get nswap"); |
| 80 | return -1; |
| 81 | } |
| 82 | if (nswap == 0) { |
| 83 | return 0; |
| 84 | } |
| 85 | |
| 86 | // Allocate storage for resource entries |
| 87 | stbl = (swaptbl_t*) malloc(nswap * sizeof(swapent_t) + |
| 88 | sizeof(struct swaptable)); |
| 89 | if (stbl == NULL) { |
| 90 | JNU_ThrowOutOfMemoryError(env, 0); |
| 91 | return -1; |
| 92 | } |
| 93 | |
| 94 | // Allocate storage for the table |
| 95 | strtab = (char*) malloc((nswap + 1) * MAXPATHLEN); |
| 96 | if (strtab == NULL) { |
| 97 | free(stbl); |
| 98 | JNU_ThrowOutOfMemoryError(env, 0); |
| 99 | return -1; |
| 100 | } |
| 101 | |
| 102 | for (i = 0; i < (nswap + 1); i++) { |
| 103 | stbl->swt_ent[i].ste_path = strtab + (i * MAXPATHLEN); |
| 104 | } |
| 105 | stbl->swt_n = nswap + 1; |
| 106 | |
| 107 | // Get the entries |
| 108 | if ((count = swapctl(SC_LIST, stbl)) < 0) { |
| 109 | free(stbl); |
| 110 | free(strtab); |
| 111 | throw_internal_error(env, "swapctl failed to get swap list"); |
| 112 | return -1; |
| 113 | } |
| 114 | |
| 115 | // Sum the entries to get total and free swap |
| 116 | total = 0; |
| 117 | avail = 0; |
| 118 | for (i = 0; i < count; i++) { |
| 119 | total += stbl->swt_ent[i].ste_pages; |
| 120 | avail += stbl->swt_ent[i].ste_free; |
| 121 | } |
| 122 | |
| 123 | free(stbl); |
| 124 | free(strtab); |
| 125 | return available ? ((jlong)avail * page_size) : |
| 126 | ((jlong)total * page_size); |
| 127 | #else /* __linux__ */ |
| 128 | int ret; |
| 129 | FILE *fp; |
| 130 | jlong total = 0, avail = 0; |
| 131 | |
| 132 | struct sysinfo si; |
| 133 | ret = sysinfo(&si); |
| 134 | if (ret != 0) { |
| 135 | throw_internal_error(env, "sysinfo failed to get swap size"); |
| 136 | } |
| 137 | total = (jlong)si.totalswap * si.mem_unit; |
| 138 | avail = (jlong)si.freeswap * si.mem_unit; |
| 139 | |
| 140 | return available ? avail : total; |
| 141 | #endif |
| 142 | } |
| 143 | |
| 144 | JNIEXPORT void JNICALL |
| 145 | Java_com_sun_management_UnixOperatingSystem_initialize |
| 146 | (JNIEnv *env, jclass cls) |
| 147 | { |
| 148 | page_size = sysconf(_SC_PAGESIZE); |
| 149 | } |
| 150 | |
| 151 | JNIEXPORT jlong JNICALL |
| 152 | Java_com_sun_management_UnixOperatingSystem_getCommittedVirtualMemorySize |
| 153 | (JNIEnv *env, jobject mbean) |
| 154 | { |
| 155 | #ifdef __solaris__ |
| 156 | psinfo_t psinfo; |
| 157 | ssize_t result; |
| 158 | size_t remaining; |
| 159 | char* addr; |
| 160 | int fd; |
| 161 | |
| 162 | fd = JVM_Open("/proc/self/psinfo", O_RDONLY, 0); |
| 163 | if (fd < 0) { |
| 164 | throw_internal_error(env, "Unable to open /proc/self/psinfo"); |
| 165 | return -1; |
| 166 | } |
| 167 | |
| 168 | addr = (char *)&psinfo; |
| 169 | for (remaining = sizeof(psinfo_t); remaining > 0;) { |
| 170 | result = JVM_Read(fd, addr, remaining); |
| 171 | if (result < 0) { |
| 172 | JVM_Close(fd); |
| 173 | throw_internal_error(env, "Unable to read /proc/self/psinfo"); |
| 174 | return -1; |
| 175 | } |
| 176 | remaining -= result; |
| 177 | addr += result; |
| 178 | } |
| 179 | |
| 180 | JVM_Close(fd); |
| 181 | return (jlong) psinfo.pr_size * 1024; |
| 182 | #else /* __linux__ */ |
| 183 | FILE *fp; |
| 184 | unsigned long vsize = 0; |
| 185 | |
| 186 | if ((fp = fopen("/proc/self/stat", "r")) == NULL) { |
| 187 | throw_internal_error(env, "Unable to open /proc/self/stat"); |
| 188 | return -1; |
| 189 | } |
| 190 | |
| 191 | // Ignore everything except the vsize entry |
| 192 | if (fscanf(fp, "%*d %*s %*c %*d %*d %*d %*d %*d %*u %*u %*u %*u %*u %*d %*d %*d %*d %*d %*d %*u %*u %*d %lu %*[^\n]\n", &vsize) == EOF) { |
| 193 | throw_internal_error(env, "Unable to get virtual memory usage"); |
| 194 | fclose(fp); |
| 195 | return -1; |
| 196 | } |
| 197 | |
| 198 | fclose(fp); |
| 199 | return (jlong)vsize; |
| 200 | #endif |
| 201 | } |
| 202 | |
| 203 | JNIEXPORT jlong JNICALL |
| 204 | Java_com_sun_management_UnixOperatingSystem_getTotalSwapSpaceSize |
| 205 | (JNIEnv *env, jobject mbean) |
| 206 | { |
| 207 | return get_total_or_available_swap_space_size(env, JNI_FALSE); |
| 208 | } |
| 209 | |
| 210 | JNIEXPORT jlong JNICALL |
| 211 | Java_com_sun_management_UnixOperatingSystem_getFreeSwapSpaceSize |
| 212 | (JNIEnv *env, jobject mbean) |
| 213 | { |
| 214 | return get_total_or_available_swap_space_size(env, JNI_TRUE); |
| 215 | } |
| 216 | |
| 217 | JNIEXPORT jlong JNICALL |
| 218 | Java_com_sun_management_UnixOperatingSystem_getProcessCpuTime |
| 219 | (JNIEnv *env, jobject mbean) |
| 220 | { |
| 221 | jlong clk_tck, ns_per_clock_tick; |
| 222 | jlong cpu_time_ns; |
| 223 | struct tms time; |
| 224 | |
| 225 | #ifdef __solaris__ |
| 226 | clk_tck = (jlong) sysconf(_SC_CLK_TCK); |
| 227 | #else /* __linux__ */ |
| 228 | clk_tck = 100; |
| 229 | #endif |
| 230 | if (clk_tck == -1) { |
| 231 | throw_internal_error(env, |
| 232 | "sysconf failed - not able to get clock tick"); |
| 233 | return -1; |
| 234 | } |
| 235 | |
| 236 | times(&time); |
| 237 | ns_per_clock_tick = (jlong) 1000 * 1000 * 1000 / (jlong) clk_tck; |
| 238 | cpu_time_ns = ((jlong)time.tms_utime + (jlong) time.tms_stime) * |
| 239 | ns_per_clock_tick; |
| 240 | return cpu_time_ns; |
| 241 | } |
| 242 | |
| 243 | JNIEXPORT jlong JNICALL |
| 244 | Java_com_sun_management_UnixOperatingSystem_getFreePhysicalMemorySize |
| 245 | (JNIEnv *env, jobject mbean) |
| 246 | { |
| 247 | jlong num_avail_physical_pages = sysconf(_SC_AVPHYS_PAGES); |
| 248 | return (num_avail_physical_pages * page_size); |
| 249 | } |
| 250 | |
| 251 | JNIEXPORT jlong JNICALL |
| 252 | Java_com_sun_management_UnixOperatingSystem_getTotalPhysicalMemorySize |
| 253 | (JNIEnv *env, jobject mbean) |
| 254 | { |
| 255 | jlong num_physical_pages = sysconf(_SC_PHYS_PAGES); |
| 256 | return (num_physical_pages * page_size); |
| 257 | } |
| 258 | |
| 259 | JNIEXPORT jlong JNICALL |
| 260 | Java_com_sun_management_UnixOperatingSystem_getOpenFileDescriptorCount |
| 261 | (JNIEnv *env, jobject mbean) |
| 262 | { |
| 263 | DIR *dirp; |
| 264 | struct dirent dbuf; |
| 265 | struct dirent* dentp; |
| 266 | jlong fds = 0; |
| 267 | |
| 268 | dirp = opendir("/proc/self/fd"); |
| 269 | if (dirp == NULL) { |
| 270 | throw_internal_error(env, "Unable to open directory /proc/self/fd"); |
| 271 | return -1; |
| 272 | } |
| 273 | |
| 274 | // iterate through directory entries, skipping '.' and '..' |
| 275 | // each entry represents an open file descriptor. |
| 276 | while ((dentp = read_dir(dirp, &dbuf)) != NULL) { |
| 277 | if (isdigit(dentp->d_name[0])) { |
| 278 | fds++; |
| 279 | } |
| 280 | } |
| 281 | |
| 282 | closedir(dirp); |
| 283 | // subtract by 1 which was the fd open for this implementation |
| 284 | return (fds - 1); |
| 285 | } |
| 286 | |
| 287 | JNIEXPORT jlong JNICALL |
| 288 | Java_com_sun_management_UnixOperatingSystem_getMaxFileDescriptorCount |
| 289 | (JNIEnv *env, jobject mbean) |
| 290 | { |
| 291 | struct rlimit rlp; |
| 292 | |
| 293 | if (getrlimit(RLIMIT_NOFILE, &rlp) == -1) { |
| 294 | throw_internal_error(env, "getrlimit failed"); |
| 295 | return -1; |
| 296 | } |
| 297 | return (jlong) rlp.rlim_cur; |
| 298 | } |