src/jdk.hotspot.agent/linux/native/libsaproc/LinuxDebuggerLocal.c

*** 1,7 ****
  /*
!  * Copyright (c) 2002, 2013, 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.
--- 1,7 ----
  /*
!  * Copyright (c) 2002, 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.
*** 64,73 ****
--- 64,75 ----
  static jmethodID createClosestSymbol_ID = 0;
  static jmethodID createLoadObject_ID = 0;
  static jmethodID getThreadForThreadId_ID = 0;
  static jmethodID listAdd_ID = 0;
  
+ static char *saaltroot = NULL;
+ 
  #define CHECK_EXCEPTION_(value) if ((*env)->ExceptionOccurred(env)) { return value; }
  #define CHECK_EXCEPTION if ((*env)->ExceptionOccurred(env)) { return;}
  #define THROW_NEW_DEBUGGER_EXCEPTION_(str, value) { throw_new_debugger_exception(env, str); return value; }
  #define THROW_NEW_DEBUGGER_EXCEPTION(str) { throw_new_debugger_exception(env, str); return;}
  
*** 209,233 ****
  }
  
  
  /*
   * Class:     sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal
   * Method:    attach0
!  * Signature: (I)V
   */
! JNIEXPORT void JNICALL Java_sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal_attach0__I
!   (JNIEnv *env, jobject this_obj, jint jpid) {
  
    // For bitness checking, locate binary at /proc/jpid/exe
    char buf[PATH_MAX];
    snprintf((char *) &buf, PATH_MAX, "/proc/%d/exe", jpid);
    verifyBitness(env, (char *) &buf);
    CHECK_EXCEPTION;
  
    char err_buf[200];
    struct ps_prochandle* ph;
!   if ( (ph = Pgrab(jpid, err_buf, sizeof(err_buf))) == NULL) {
      char msg[230];
      snprintf(msg, sizeof(msg), "Can't attach to the process: %s", err_buf);
      THROW_NEW_DEBUGGER_EXCEPTION(msg);
    }
    (*env)->SetLongField(env, this_obj, p_ps_prochandle_ID, (jlong)(intptr_t)ph);
--- 211,258 ----
  }
  
  
  /*
   * Class:     sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal
+  * Method:    setSAAltRoot0
+  * Signature: (Ljava/lang/String;)V
+  */
+ JNIEXPORT void JNICALL Java_sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal_setSAAltRoot0
+   (JNIEnv *env, jobject this_obj, jstring altroot) {
+   if (saaltroot != NULL) {
+     free(saaltroot);
+   }
+   const char *path = (*env)->GetStringUTFChars(env, altroot, JNI_FALSE);
+   /*
+    * `saaltroot` is used for putenv().
+    * So we need to keep this memory.
+    */
+   static const char *PREFIX = "SA_ALTROOT=";
+   size_t len = strlen(PREFIX) + strlen(path) + 1;
+   saaltroot = (char *)malloc(len);
+   snprintf(saaltroot, len, "%s%s", PREFIX, path);
+   putenv(saaltroot);
+   (*env)->ReleaseStringUTFChars(env, altroot, path);
+ }
+ 
+ /*
+  * Class:     sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal
   * Method:    attach0
!  * Signature: (IZ)V
   */
! JNIEXPORT void JNICALL Java_sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal_attach0__IZ
!   (JNIEnv *env, jobject this_obj, jint jpid, jboolean is_in_container) {
  
    // For bitness checking, locate binary at /proc/jpid/exe
    char buf[PATH_MAX];
    snprintf((char *) &buf, PATH_MAX, "/proc/%d/exe", jpid);
    verifyBitness(env, (char *) &buf);
    CHECK_EXCEPTION;
  
    char err_buf[200];
    struct ps_prochandle* ph;
!   if ( (ph = Pgrab(jpid, err_buf, sizeof(err_buf), is_in_container)) == NULL) {
      char msg[230];
      snprintf(msg, sizeof(msg), "Can't attach to the process: %s", err_buf);
      THROW_NEW_DEBUGGER_EXCEPTION(msg);
    }
    (*env)->SetLongField(env, this_obj, p_ps_prochandle_ID, (jlong)(intptr_t)ph);
*** 274,283 ****
--- 299,312 ----
    (JNIEnv *env, jobject this_obj) {
    struct ps_prochandle* ph = get_proc_handle(env, this_obj);
    if (ph != NULL) {
       Prelease(ph);
    }
+   if (saaltroot != NULL) {
+     free(saaltroot);
+     saaltroot = NULL;
+   }
  }
  
  /*
   * Class:     sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal
   * Method:    lookupByName0