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src/java.base/share/native/libjava/io_util.c

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rev 53271 : 8216981: Per thread IO statistics in JFR


  33 #include "io_util.h"
  34 #include "io_util_md.h"
  35 
  36 /* IO helper functions */
  37 
  38 jint
  39 readSingle(JNIEnv *env, jobject this, jfieldID fid) {
  40     jint nread;
  41     char ret;
  42     FD fd = GET_FD(this, fid);
  43     if (fd == -1) {
  44         JNU_ThrowIOException(env, "Stream Closed");
  45         return -1;
  46     }
  47     nread = IO_Read(fd, &ret, 1);
  48     if (nread == 0) { /* EOF */
  49         return -1;
  50     } else if (nread == -1) { /* error */
  51         JNU_ThrowIOExceptionWithLastError(env, "Read error");
  52     }



  53     return ret & 0xFF;
  54 }
  55 
  56 /* The maximum size of a stack-allocated buffer.
  57  */
  58 #define BUF_SIZE 8192
  59 
  60 /*
  61  * Returns true if the array slice defined by the given offset and length
  62  * is out of bounds.
  63  */
  64 static int
  65 outOfBounds(JNIEnv *env, jint off, jint len, jbyteArray array) {
  66     return ((off < 0) ||
  67             (len < 0) ||
  68             // We are very careful to avoid signed integer overflow,
  69             // the result of which is undefined in C.
  70             ((*env)->GetArrayLength(env, array) - off < len));
  71 }
  72 


  92     if (len == 0) {
  93         return 0;
  94     } else if (len > BUF_SIZE) {
  95         buf = malloc(len);
  96         if (buf == NULL) {
  97             JNU_ThrowOutOfMemoryError(env, NULL);
  98             return 0;
  99         }
 100     } else {
 101         buf = stackBuf;
 102     }
 103 
 104     fd = GET_FD(this, fid);
 105     if (fd == -1) {
 106         JNU_ThrowIOException(env, "Stream Closed");
 107         nread = -1;
 108     } else {
 109         nread = IO_Read(fd, buf, len);
 110         if (nread > 0) {
 111             (*env)->SetByteArrayRegion(env, bytes, off, nread, (jbyte *)buf);

 112         } else if (nread == -1) {
 113             JNU_ThrowIOExceptionWithLastError(env, "Read error");
 114         } else { /* EOF */
 115             nread = -1;
 116         }
 117     }
 118 
 119     if (buf != stackBuf) {
 120         free(buf);
 121     }
 122     return nread;
 123 }
 124 
 125 void
 126 writeSingle(JNIEnv *env, jobject this, jint byte, jboolean append, jfieldID fid) {
 127     // Discard the 24 high-order bits of byte. See OutputStream#write(int)
 128     char c = (char) byte;
 129     jint n;
 130     FD fd = GET_FD(this, fid);
 131     if (fd == -1) {
 132         JNU_ThrowIOException(env, "Stream Closed");
 133         return;
 134     }
 135     if (append == JNI_TRUE) {
 136         n = IO_Append(fd, &c, 1);
 137     } else {
 138         n = IO_Write(fd, &c, 1);
 139     }
 140     if (n == -1) {
 141         JNU_ThrowIOExceptionWithLastError(env, "Write error");
 142     }

 143 }
 144 
 145 void
 146 writeBytes(JNIEnv *env, jobject this, jbyteArray bytes,
 147            jint off, jint len, jboolean append, jfieldID fid)
 148 {
 149     jint n;
 150     char stackBuf[BUF_SIZE];
 151     char *buf = NULL;
 152     FD fd;
 153 
 154     if (IS_NULL(bytes)) {
 155         JNU_ThrowNullPointerException(env, NULL);
 156         return;
 157     }
 158 
 159     if (outOfBounds(env, off, len, bytes)) {
 160         JNU_ThrowByName(env, "java/lang/IndexOutOfBoundsException", NULL);
 161         return;
 162     }


 178     if (!(*env)->ExceptionOccurred(env)) {
 179         off = 0;
 180         while (len > 0) {
 181             fd = GET_FD(this, fid);
 182             if (fd == -1) {
 183                 JNU_ThrowIOException(env, "Stream Closed");
 184                 break;
 185             }
 186             if (append == JNI_TRUE) {
 187                 n = IO_Append(fd, buf+off, len);
 188             } else {
 189                 n = IO_Write(fd, buf+off, len);
 190             }
 191             if (n == -1) {
 192                 JNU_ThrowIOExceptionWithLastError(env, "Write error");
 193                 break;
 194             }
 195             off += n;
 196             len -= n;
 197         }

 198     }
 199     if (buf != stackBuf) {
 200         free(buf);
 201     }
 202 }
 203 
 204 void
 205 throwFileNotFoundException(JNIEnv *env, jstring path)
 206 {
 207     char buf[256];
 208     size_t n;
 209     jobject x;
 210     jstring why = NULL;
 211 
 212     n = getLastErrorString(buf, sizeof(buf));
 213     if (n > 0) {
 214         why = JNU_NewStringPlatform(env, buf);
 215         CHECK_NULL(why);
 216     }
 217     x = JNU_NewObjectByName(env,


  33 #include "io_util.h"
  34 #include "io_util_md.h"
  35 
  36 /* IO helper functions */
  37 
  38 jint
  39 readSingle(JNIEnv *env, jobject this, jfieldID fid) {
  40     jint nread;
  41     char ret;
  42     FD fd = GET_FD(this, fid);
  43     if (fd == -1) {
  44         JNU_ThrowIOException(env, "Stream Closed");
  45         return -1;
  46     }
  47     nread = IO_Read(fd, &ret, 1);
  48     if (nread == 0) { /* EOF */
  49         return -1;
  50     } else if (nread == -1) { /* error */
  51         JNU_ThrowIOExceptionWithLastError(env, "Read error");
  52     }
  53 
  54     JVM_callFileReadBytes(env, 1);
  55 
  56     return ret & 0xFF;
  57 }
  58 
  59 /* The maximum size of a stack-allocated buffer.
  60  */
  61 #define BUF_SIZE 8192
  62 
  63 /*
  64  * Returns true if the array slice defined by the given offset and length
  65  * is out of bounds.
  66  */
  67 static int
  68 outOfBounds(JNIEnv *env, jint off, jint len, jbyteArray array) {
  69     return ((off < 0) ||
  70             (len < 0) ||
  71             // We are very careful to avoid signed integer overflow,
  72             // the result of which is undefined in C.
  73             ((*env)->GetArrayLength(env, array) - off < len));
  74 }
  75 


  95     if (len == 0) {
  96         return 0;
  97     } else if (len > BUF_SIZE) {
  98         buf = malloc(len);
  99         if (buf == NULL) {
 100             JNU_ThrowOutOfMemoryError(env, NULL);
 101             return 0;
 102         }
 103     } else {
 104         buf = stackBuf;
 105     }
 106 
 107     fd = GET_FD(this, fid);
 108     if (fd == -1) {
 109         JNU_ThrowIOException(env, "Stream Closed");
 110         nread = -1;
 111     } else {
 112         nread = IO_Read(fd, buf, len);
 113         if (nread > 0) {
 114             (*env)->SetByteArrayRegion(env, bytes, off, nread, (jbyte *)buf);
 115             JVM_callFileReadBytes(env, nread);
 116         } else if (nread == -1) {
 117             JNU_ThrowIOExceptionWithLastError(env, "Read error");
 118         } else { /* EOF */
 119             nread = -1;
 120         }
 121     }
 122 
 123     if (buf != stackBuf) {
 124         free(buf);
 125     }
 126     return nread;
 127 }
 128 
 129 void
 130 writeSingle(JNIEnv *env, jobject this, jint byte, jboolean append, jfieldID fid) {
 131     // Discard the 24 high-order bits of byte. See OutputStream#write(int)
 132     char c = (char) byte;
 133     jint n;
 134     FD fd = GET_FD(this, fid);
 135     if (fd == -1) {
 136         JNU_ThrowIOException(env, "Stream Closed");
 137         return;
 138     }
 139     if (append == JNI_TRUE) {
 140         n = IO_Append(fd, &c, 1);
 141     } else {
 142         n = IO_Write(fd, &c, 1);
 143     }
 144     if (n == -1) {
 145         JNU_ThrowIOExceptionWithLastError(env, "Write error");
 146     }
 147     JVM_callFileWriteBytes(env, 1);
 148 }
 149 
 150 void
 151 writeBytes(JNIEnv *env, jobject this, jbyteArray bytes,
 152            jint off, jint len, jboolean append, jfieldID fid)
 153 {
 154     jint n;
 155     char stackBuf[BUF_SIZE];
 156     char *buf = NULL;
 157     FD fd;
 158 
 159     if (IS_NULL(bytes)) {
 160         JNU_ThrowNullPointerException(env, NULL);
 161         return;
 162     }
 163 
 164     if (outOfBounds(env, off, len, bytes)) {
 165         JNU_ThrowByName(env, "java/lang/IndexOutOfBoundsException", NULL);
 166         return;
 167     }


 183     if (!(*env)->ExceptionOccurred(env)) {
 184         off = 0;
 185         while (len > 0) {
 186             fd = GET_FD(this, fid);
 187             if (fd == -1) {
 188                 JNU_ThrowIOException(env, "Stream Closed");
 189                 break;
 190             }
 191             if (append == JNI_TRUE) {
 192                 n = IO_Append(fd, buf+off, len);
 193             } else {
 194                 n = IO_Write(fd, buf+off, len);
 195             }
 196             if (n == -1) {
 197                 JNU_ThrowIOExceptionWithLastError(env, "Write error");
 198                 break;
 199             }
 200             off += n;
 201             len -= n;
 202         }
 203         JVM_callFileWriteBytes(env, off);
 204     }
 205     if (buf != stackBuf) {
 206         free(buf);
 207     }
 208 }
 209 
 210 void
 211 throwFileNotFoundException(JNIEnv *env, jstring path)
 212 {
 213     char buf[256];
 214     size_t n;
 215     jobject x;
 216     jstring why = NULL;
 217 
 218     n = getLastErrorString(buf, sizeof(buf));
 219     if (n > 0) {
 220         why = JNU_NewStringPlatform(env, buf);
 221         CHECK_NULL(why);
 222     }
 223     x = JNU_NewObjectByName(env,
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