JDK14/Java14源码在线阅读
/*
* Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include "jni.h"
#include "jni_util.h"
#include "java_lang_ProcessHandleImpl.h"
#include "java_lang_ProcessHandleImpl_Info.h"
#include "ProcessHandleImpl_unix.h"
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <dirent.h>
#include <ctype.h>
#include <limits.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
/* For POSIX-compliant getpwuid_r on Solaris */
#if defined(__solaris__)
#define _POSIX_PTHREAD_SEMANTICS
#endif
#include <pwd.h>
#ifdef _AIX
#include <sys/procfs.h>
#endif
#ifdef __solaris__
#include <procfs.h>
#endif
#if defined(_AIX)
#define DIR DIR64
#define dirent dirent64
#define opendir opendir64
#define readdir readdir64
#define closedir closedir64
#endif
/**
* This file contains the implementation of the native ProcessHandleImpl
* functions which are common to all Unix variants.
*
* The currently supported Unix variants are Solaris, Linux, MaxOS X and AIX.
* The various similarities and differences between these systems make it hard
* to find a clear boundary between platform specific and shared code.
*
* In order to ease code sharing between the platforms while still keeping the
* code as clean as possible (i.e. free of preprocessor macros) we use the
* following source code layout (remember that ProcessHandleImpl_unix.c will
* be compiled on EVERY Unix platform while ProcessHandleImpl_<os>.c will be
* only compiled on the specific OS):
*
* - all the JNI wrappers for the ProcessHandleImpl functions go into this file
* - if their implementation is common on ALL the supported Unix platforms it
* goes right into the JNI wrappers
* - if the whole function or substantial parts of it are platform dependent,
* the implementation goes into os_<function_name> functions in
* ProcessHandleImpl_<os>.c
* - if at least two platforms implement an os_<function_name> function in the
* same way, this implementation is factored out into unix_<function_name>,
* placed into this file and called from the corresponding os_<function_name>
* function.
* - For convenience, all the os_ and unix_ functions are declared in
* ProcessHandleImpl_unix.h which is included into every
* ProcessHandleImpl_<os>.c file.
*
* Example 1:
* ----------
* The implementation of Java_java_lang_ProcessHandleImpl_initNative()
* is the same on all platforms except on Linux where it initilizes one
* additional field. So we place the implementation right into
* Java_java_lang_ProcessHandleImpl_initNative() but add call to
* os_init() at the end of the function which is empty on all platforms
* except Linux where it performs the additionally initializations.
*
* Example 2:
* ----------
* The implementation of Java_java_lang_ProcessHandleImpl_00024Info_info0 is the
* same on Solaris and AIX but different on Linux and MacOSX. We therefore simply
* call the helpers os_getParentPidAndTimings() and os_getCmdlineAndUserInfo().
* The Linux and MaxOS X versions of these functions (in the corresponding files
* ProcessHandleImpl_linux.c and ProcessHandleImpl_macosx.c) directly contain
* the platform specific implementations while the Solaris and AIX
* implementations simply call back to unix_getParentPidAndTimings() and
* unix_getCmdlineAndUserInfo() which are implemented right in this file.
*
* The term "same implementation" is still a question of interpretation. It my
* be acceptable to have a few ifdef'ed lines if that allows the sharing of a
* huge function. On the other hand, if the platform specific code in a shared
* function grows over a certain limit, it may be better to refactor that
* functionality into corresponding, platform-specific os_ functions.
*/
#ifndef WIFEXITED
#define WIFEXITED(status) (((status)&0xFF) == 0)
#endif
#ifndef WEXITSTATUS
#define WEXITSTATUS(status) (((status)>>8)&0xFF)
#endif
#ifndef WIFSIGNALED
#define WIFSIGNALED(status) (((status)&0xFF) > 0 && ((status)&0xFF00) == 0)
#endif
#ifndef WTERMSIG
#define WTERMSIG(status) ((status)&0x7F)
#endif
#ifdef __solaris__
/* The child exited because of a signal.
* The best value to return is 0x80 + signal number,
* because that is what all Unix shells do, and because
* it allows callers to distinguish between process exit and
* process death by signal.
* Unfortunately, the historical behavior on Solaris is to return
* the signal number, and we preserve this for compatibility. */
#define WTERMSIG_RETURN(status) WTERMSIG(status)
#else
#define WTERMSIG_RETURN(status) (WTERMSIG(status) + 0x80)
#endif
#define RESTARTABLE(_cmd, _result) do { \
do { \
_result = _cmd; \
} while((_result == -1) && (errno == EINTR)); \
} while(0)
#define RESTARTABLE_RETURN_PTR(_cmd, _result) do { \
do { \
_result = _cmd; \
} while((_result == NULL) && (errno == EINTR)); \
} while(0)
/* Field id for jString 'command' in java.lang.ProcessHandleImpl.Info */
jfieldID ProcessHandleImpl_Info_commandID;
/* Field id for jString 'commandLine' in java.lang.ProcessHandleImpl.Info */
jfieldID ProcessHandleImpl_Info_commandLineID;
/* Field id for jString[] 'arguments' in java.lang.ProcessHandleImpl.Info */
jfieldID ProcessHandleImpl_Info_argumentsID;
/* Field id for jlong 'totalTime' in java.lang.ProcessHandleImpl.Info */
jfieldID ProcessHandleImpl_Info_totalTimeID;
/* Field id for jlong 'startTime' in java.lang.ProcessHandleImpl.Info */
jfieldID ProcessHandleImpl_Info_startTimeID;
/* Field id for jString 'user' in java.lang.ProcessHandleImpl.Info */
jfieldID ProcessHandleImpl_Info_userID;
/* Size of password or group entry when not available via sysconf */
#define ENT_BUF_SIZE 1024
/* The value for the size of the buffer used by getpwuid_r(). The result of */
/* sysconf(_SC_GETPW_R_SIZE_MAX) if available or ENT_BUF_SIZE otherwise. */
static long getpw_buf_size;
/**************************************************************
* Static method to initialize field IDs and the ticks per second rate.
*
* Class: java_lang_ProcessHandleImpl_Info
* Method: initIDs
* Signature: ()V
*/
JNIEXPORT void JNICALL
Java_java_lang_ProcessHandleImpl_00024Info_initIDs(JNIEnv *env, jclass clazz) {
CHECK_NULL(ProcessHandleImpl_Info_commandID =
(*env)->GetFieldID(env, clazz, "command", "Ljava/lang/String;"));
CHECK_NULL(ProcessHandleImpl_Info_commandLineID =
(*env)->GetFieldID(env, clazz, "commandLine", "Ljava/lang/String;"));
CHECK_NULL(ProcessHandleImpl_Info_argumentsID =
(*env)->GetFieldID(env, clazz, "arguments", "[Ljava/lang/String;"));
CHECK_NULL(ProcessHandleImpl_Info_totalTimeID =
(*env)->GetFieldID(env, clazz, "totalTime", "J"));
CHECK_NULL(ProcessHandleImpl_Info_startTimeID =
(*env)->GetFieldID(env, clazz, "startTime", "J"));
CHECK_NULL(ProcessHandleImpl_Info_userID =
(*env)->GetFieldID(env, clazz, "user", "Ljava/lang/String;"));
}
/***********************************************************
* Static method to initialize platform dependent constants.
*
* Class: java_lang_ProcessHandleImpl
* Method: initNative
* Signature: ()V
*/
JNIEXPORT void JNICALL
Java_java_lang_ProcessHandleImpl_initNative(JNIEnv *env, jclass clazz) {
getpw_buf_size = sysconf(_SC_GETPW_R_SIZE_MAX);
if (getpw_buf_size == -1) {
getpw_buf_size = ENT_BUF_SIZE;
}
os_initNative(env, clazz);
}
/* Block until a child process exits and return its exit code.
* Note, can only be called once for any given pid if reapStatus = true.
*
* Class: java_lang_ProcessHandleImpl
* Method: waitForProcessExit0
* Signature: (JZ)I
*/
JNIEXPORT jint JNICALL
Java_java_lang_ProcessHandleImpl_waitForProcessExit0(JNIEnv* env,
jclass junk,
jlong jpid,
jboolean reapStatus) {
pid_t pid = (pid_t)jpid;
errno = 0;
if (reapStatus != JNI_FALSE) {
/* Wait for the child process to exit.
* waitpid() is standard, so use it on all POSIX platforms.
* It is known to work when blocking to wait for the pid
* This returns immediately if the child has already exited.
*/
int status;
while (waitpid(pid, &status, 0) < 0) {
switch (errno) {
case ECHILD:
return java_lang_ProcessHandleImpl_NOT_A_CHILD; // No child
case EINTR: break;
default: return -1;
}
}
if (WIFEXITED(status)) {
return WEXITSTATUS(status);
} else if (WIFSIGNALED(status)) {
return WTERMSIG_RETURN(status);
} else {
return status;
}
} else {
/*
* Wait for the child process to exit without reaping the exitValue.
* waitid() is standard on all POSIX platforms.
* Note: waitid on Mac OS X 10.7 seems to be broken;
* it does not return the exit status consistently.
*/
siginfo_t siginfo;
int options = WEXITED | WNOWAIT;
memset(&siginfo, 0, sizeof siginfo);
while (waitid(P_PID, pid, &siginfo, options) < 0) {
switch (errno) {
case ECHILD:
return java_lang_ProcessHandleImpl_NOT_A_CHILD; // No child
case EINTR: break;
default: return -1;
}
}
if (siginfo.si_code == CLD_EXITED) {
/*
* The child exited normally; get its exit code.
*/
return siginfo.si_status;
} else if (siginfo.si_code == CLD_KILLED || siginfo.si_code == CLD_DUMPED) {
return WTERMSIG_RETURN(siginfo.si_status);
} else {
/*
* Unknown exit code; pass it through.
*/
return siginfo.si_status;
}
}
}
/*
* Class: java_lang_ProcessHandleImpl
* Method: getCurrentPid0
* Signature: ()J
*/
JNIEXPORT jlong JNICALL
Java_java_lang_ProcessHandleImpl_getCurrentPid0(JNIEnv *env, jclass clazz) {
pid_t pid = getpid();
return (jlong) pid;
}
/*
* Class: java_lang_ProcessHandleImpl
* Method: destroy0
* Signature: (JJZ)Z
*/
JNIEXPORT jboolean JNICALL
Java_java_lang_ProcessHandleImpl_destroy0(JNIEnv *env,
jobject obj,
jlong jpid,
jlong startTime,
jboolean force) {
pid_t pid = (pid_t) jpid;
int sig = (force == JNI_TRUE) ? SIGKILL : SIGTERM;
jlong start = Java_java_lang_ProcessHandleImpl_isAlive0(env, obj, jpid);
if (start == startTime || start == 0 || startTime == 0) {
return (kill(pid, sig) < 0) ? JNI_FALSE : JNI_TRUE;
} else {
return JNI_FALSE;
}
}
/*
* Returns the children of the requested pid and optionally each parent and
* start time.
* Accumulates any process who parent pid matches.
* The resulting pids are stored into the array of longs.
* The number of pids is returned if they all fit.
* If the array is too short, the negative of the desired length is returned.
* Class: java_lang_ProcessHandleImpl
* Method: getProcessPids0
* Signature: (J[J[J[J)I
*/
JNIEXPORT jint JNICALL
Java_java_lang_ProcessHandleImpl_getProcessPids0(JNIEnv *env,
jclass clazz,
jlong jpid,
jlongArray jarray,
jlongArray jparentArray,
jlongArray jstimesArray) {
return os_getChildren(env, jpid, jarray, jparentArray, jstimesArray);
}
/*
* Fill in the Info object from the OS information about the process.
*
* Class: java_lang_ProcessHandleImpl_Info
* Method: info0
* Signature: (Ljava/lang/ProcessHandle/Info;J)I
*/
JNIEXPORT void JNICALL
Java_java_lang_ProcessHandleImpl_00024Info_info0(JNIEnv *env,
jobject jinfo,
jlong jpid) {
pid_t pid = (pid_t) jpid;
pid_t ppid;
jlong totalTime = -1L;
jlong startTime = -1L;
ppid = os_getParentPidAndTimings(env, pid, &totalTime, &startTime);
if (ppid >= 0) {
(*env)->SetLongField(env, jinfo, ProcessHandleImpl_Info_totalTimeID, totalTime);
JNU_CHECK_EXCEPTION(env);
(*env)->SetLongField(env, jinfo, ProcessHandleImpl_Info_startTimeID, startTime);
JNU_CHECK_EXCEPTION(env);
}
os_getCmdlineAndUserInfo(env, jinfo, pid);
}
/*
* Check if a process is alive.
* Return the start time (ms since 1970) if it is available.
* If the start time is not available return 0.
* If the pid is invalid, return -1.
*
* Class: java_lang_ProcessHandleImpl
* Method: isAlive0
* Signature: (J)J
*/
JNIEXPORT jlong JNICALL
Java_java_lang_ProcessHandleImpl_isAlive0(JNIEnv *env, jobject obj, jlong jpid) {
pid_t pid = (pid_t) jpid;
jlong startTime = 0L;
jlong totalTime = 0L;
pid_t ppid = os_getParentPidAndTimings(env, pid, &totalTime, &startTime);
return (ppid < 0) ? -1 : startTime;
}
/*
* Returns the parent pid of the requested pid.
* The start time of the process must match (or be ANY).
*
* Class: java_lang_ProcessHandleImpl
* Method: parent0
* Signature: (JJ)J
*/
JNIEXPORT jlong JNICALL
Java_java_lang_ProcessHandleImpl_parent0(JNIEnv *env,
jobject obj,
jlong jpid,
jlong startTime) {
pid_t pid = (pid_t) jpid;
pid_t ppid;
if (pid == getpid()) {
ppid = getppid();
} else {
jlong start = 0L;
jlong total = 0L; // unused
ppid = os_getParentPidAndTimings(env, pid, &total, &start);
if (start != startTime && start != 0 && startTime != 0) {
ppid = -1;
}
}
return (jlong) ppid;
}
/**
* Construct the argument array by parsing the arguments from the sequence
* of arguments.
*/
void unix_fillArgArray(JNIEnv *env, jobject jinfo, int nargs, char *cp,
char *argsEnd, jstring cmdexe, char *cmdline) {
jobject argsArray;
int i;
(*env)->SetObjectField(env, jinfo, ProcessHandleImpl_Info_commandID, cmdexe);
JNU_CHECK_EXCEPTION(env);
if (nargs >= 1) {
// Create a String array for nargs-1 elements
jclass clazzString = JNU_ClassString(env);
CHECK_NULL(clazzString);
argsArray = (*env)->NewObjectArray(env, nargs - 1, clazzString, NULL);
CHECK_NULL(argsArray);
for (i = 0; i < nargs - 1; i++) {
jstring str = NULL;
cp += strlen(cp) + 1;
if (cp > argsEnd || *cp == '\0') {
return; // Off the end pointer or an empty argument is an error
}
CHECK_NULL((str = JNU_NewStringPlatform(env, cp)));
(*env)->SetObjectArrayElement(env, argsArray, i, str);
JNU_CHECK_EXCEPTION(env);
}
(*env)->SetObjectField(env, jinfo, ProcessHandleImpl_Info_argumentsID, argsArray);
JNU_CHECK_EXCEPTION(env);
}
if (cmdline != NULL) {
jstring commandLine = NULL;
CHECK_NULL((commandLine = JNU_NewStringPlatform(env, cmdline)));
(*env)->SetObjectField(env, jinfo, ProcessHandleImpl_Info_commandLineID, commandLine);
JNU_CHECK_EXCEPTION(env);
}
}
void unix_getUserInfo(JNIEnv* env, jobject jinfo, uid_t uid) {
int result = 0;
char* pwbuf;
jstring name = NULL;
/* allocate buffer for password record */
pwbuf = (char*)malloc(getpw_buf_size);
if (pwbuf == NULL) {
JNU_ThrowOutOfMemoryError(env, "Unable to open getpwent");
} else {
struct passwd pwent;
struct passwd* p = NULL;
RESTARTABLE(getpwuid_r(uid, &pwent, pwbuf, (size_t)getpw_buf_size, &p), result);
// Create the Java String if a name was found
if (result == 0 && p != NULL &&
p->pw_name != NULL && *(p->pw_name) != '\0') {
name = JNU_NewStringPlatform(env, p->pw_name);
}
free(pwbuf);
}
if (name != NULL) {
(*env)->SetObjectField(env, jinfo, ProcessHandleImpl_Info_userID, name);
}
}
/*
* The following functions are common on Solaris, Linux and AIX.
*/
#if defined(__solaris__) || defined (__linux__) || defined(_AIX)
/*
* Returns the children of the requested pid and optionally each parent and
* start time.
* Reads /proc and accumulates any process who parent pid matches.
* The resulting pids are stored into the array of longs.
* The number of pids is returned if they all fit.
* If the array is too short, the negative of the desired length is returned.
*/
jint unix_getChildren(JNIEnv *env, jlong jpid, jlongArray jarray,
jlongArray jparentArray, jlongArray jstimesArray) {
DIR* dir;
struct dirent* ptr;
pid_t pid = (pid_t) jpid;
jlong* pids = NULL;
jlong* ppids = NULL;
jlong* stimes = NULL;
jsize parentArraySize = 0;
jsize arraySize = 0;
jsize stimesSize = 0;
jsize count = 0;
arraySize = (*env)->GetArrayLength(env, jarray);
JNU_CHECK_EXCEPTION_RETURN(env, -1);
if (jparentArray != NULL) {
parentArraySize = (*env)->GetArrayLength(env, jparentArray);
JNU_CHECK_EXCEPTION_RETURN(env, -1);
if (arraySize != parentArraySize) {
JNU_ThrowIllegalArgumentException(env, "array sizes not equal");
return 0;
}
}
if (jstimesArray != NULL) {
stimesSize = (*env)->GetArrayLength(env, jstimesArray);
JNU_CHECK_EXCEPTION_RETURN(env, -1);
if (arraySize != stimesSize) {
JNU_ThrowIllegalArgumentException(env, "array sizes not equal");
return 0;
}
}
/*
* To locate the children we scan /proc looking for files that have a
* position integer as a filename.
*/
if ((dir = opendir("/proc")) == NULL) {
JNU_ThrowByNameWithLastError(env,
"java/lang/RuntimeException", "Unable to open /proc");
return -1;
}
do { // Block to break out of on Exception
pids = (*env)->GetLongArrayElements(env, jarray, NULL);
if (pids == NULL) {
break;
}
if (jparentArray != NULL) {
ppids = (*env)->GetLongArrayElements(env, jparentArray, NULL);
if (ppids == NULL) {
break;
}
}
if (jstimesArray != NULL) {
stimes = (*env)->GetLongArrayElements(env, jstimesArray, NULL);
if (stimes == NULL) {
break;
}
}
while ((ptr = readdir(dir)) != NULL) {
pid_t ppid = 0;
jlong totalTime = 0L;
jlong startTime = 0L;
/* skip files that aren't numbers */
pid_t childpid = (pid_t) atoi(ptr->d_name);
if ((int) childpid <= 0) {
continue;
}
// Get the parent pid, and start time
ppid = os_getParentPidAndTimings(env, childpid, &totalTime, &startTime);
if (ppid >= 0 && (pid == 0 || ppid == pid)) {
if (count < arraySize) {
// Only store if it fits
pids[count] = (jlong) childpid;
if (ppids != NULL) {
// Store the parentPid
ppids[count] = (jlong) ppid;
}
if (stimes != NULL) {
// Store the process start time
stimes[count] = startTime;
}
}
count++; // Count to tabulate size needed
}
}
} while (0);
if (pids != NULL) {
(*env)->ReleaseLongArrayElements(env, jarray, pids, 0);
}
if (ppids != NULL) {
(*env)->ReleaseLongArrayElements(env, jparentArray, ppids, 0);
}
if (stimes != NULL) {
(*env)->ReleaseLongArrayElements(env, jstimesArray, stimes, 0);
}
closedir(dir);
// If more pids than array had size for; count will be greater than array size
return count;
}
#endif // defined(__solaris__) || defined (__linux__) || defined(_AIX)
/*
* The following functions are common on Solaris and AIX.
*/
#if defined(__solaris__) || defined(_AIX)
/**
* Helper function to get the 'psinfo_t' data from "/proc/%d/psinfo".
* Returns 0 on success and -1 on error.
*/
static int getPsinfo(pid_t pid, psinfo_t *psinfo) {
FILE* fp;
char fn[32];
int ret;
/*
* Try to open /proc/%d/psinfo
*/
snprintf(fn, sizeof fn, "/proc/%d/psinfo", pid);
fp = fopen(fn, "r");
if (fp == NULL) {
return -1;
}
ret = fread(psinfo, 1, sizeof(psinfo_t), fp);
fclose(fp);
if (ret < sizeof(psinfo_t)) {
return -1;
}
return 0;
}
/**
* Read /proc/<pid>/psinfo and return the ppid, total cputime and start time.
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