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5409
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1 |
"{ Package: 'stx:libbasic' }"
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2 |
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4762
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OSFileHandle subclass:#UnixFileDescriptorHandle
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instanceVariableNames:''
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classVariableNames:''
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poolDictionaries:''
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category:'OS-Unix'
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!
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9 |
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!UnixFileDescriptorHandle primitiveDefinitions!
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%{
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#include <stdio.h>
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%}
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! !
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5415
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!UnixFileDescriptorHandle methodsFor:'input/output'!
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readBytes:count into:aByteBuffer startingAt:firstIndex
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"read count bytes into a byte-buffer;
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Return the number of bytes read (negative on error)"
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%{
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unsigned char *extPtr;
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int nRead = -1;
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INT fd = (INT)(__externalAddressVal(self));
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INT cnt, offs;
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int nInstBytes, objSize;
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#include <errno.h>
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if (! __bothSmallInteger(count, firstIndex)) {
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goto bad;
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}
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cnt = __smallIntegerVal(count);
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offs = __smallIntegerVal(firstIndex) - 1;
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if (fd < 0) {
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goto bad;
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}
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if (__isExternalBytes(aByteBuffer)) {
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OBJ sz;
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42 |
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nInstBytes = 0;
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extPtr = (char *)(__externalBytesAddress(aByteBuffer));
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sz = __externalBytesSize(aByteBuffer);
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if (__isSmallInteger(sz)) {
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objSize = __smallIntegerVal(sz);
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} else {
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objSize = -1; /* unknown */
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}
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} else {
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OBJ oClass;
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int nInstVars;
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oClass = __Class(aByteBuffer);
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switch (__smallIntegerVal(__ClassInstPtr(oClass)->c_flags) & ARRAYMASK) {
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case BYTEARRAY:
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case WORDARRAY:
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case LONGARRAY:
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case SWORDARRAY:
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case SLONGARRAY:
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case FLOATARRAY:
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case DOUBLEARRAY:
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break;
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default:
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goto bad;
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}
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extPtr = (char *)0;
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nInstVars = __smallIntegerVal(__ClassInstPtr(oClass)->c_ninstvars);
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nInstBytes = __OBJS2BYTES__(nInstVars);
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objSize = __Size(aByteBuffer) - OHDR_SIZE - nInstBytes;
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}
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if ((offs >= 0)
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&& (cnt >= 0)
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&& ((objSize == -1) || (objSize >= (cnt + offs)))) {
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nRead = 0;
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do {
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int n;
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if (extPtr) {
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n = read(fd, extPtr+offs, cnt);
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} else {
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char *bp;
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/*
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* on interrupt, anObject may be moved to another location.
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* So we recompute the byte-address here.
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*/
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bp = __ByteArrayInstPtr(aByteBuffer)->ba_element + nInstBytes;
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n = read(fd, bp + offs, cnt);
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}
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if (n > 0) {
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cnt -= n;
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offs += n;
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nRead += n;
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} else {
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if (n < 0) {
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if (errno == EINTR) {
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continue;
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}
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break;
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}
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}
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} while (cnt > 0);
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RETURN (__mkSmallInteger(nRead));
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}
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bad: ;
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%}.
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^ self primitiveFailed
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"
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|h buff n|
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h := self basicNew.
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h setFileDescriptor:0.
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buff := ByteArray new:10. buff inspect.
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n := h readBytes:10 into:buff startingAt:1.
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Transcript show:n; space; showCR:buff.
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"
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!
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writeBytes:count from:aByteBuffer startingAt:firstIndex
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"write count bytes from a byte-buffer;
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Return the number of bytes written (negative on error)"
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129 |
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%{
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unsigned char *extPtr;
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int nWritten = -1;
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INT fd = (INT)(__externalAddressVal(self));
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INT cnt, offs;
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int nInstBytes, objSize;
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#include <errno.h>
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if (! __bothSmallInteger(count, firstIndex)) {
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goto bad;
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}
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cnt = __smallIntegerVal(count);
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offs = __smallIntegerVal(firstIndex) - 1;
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if (fd < 0) {
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goto bad;
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}
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if (__isExternalBytes(aByteBuffer)) {
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OBJ sz;
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148 |
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nInstBytes = 0;
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extPtr = (char *)(__externalBytesAddress(aByteBuffer));
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sz = __externalBytesSize(aByteBuffer);
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if (__isSmallInteger(sz)) {
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objSize = __smallIntegerVal(sz);
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} else {
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objSize = -1; /* unknown */
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}
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} else {
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OBJ oClass;
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int nInstVars;
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160 |
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oClass = __Class(aByteBuffer);
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switch (__smallIntegerVal(__ClassInstPtr(oClass)->c_flags) & ARRAYMASK) {
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case BYTEARRAY:
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case WORDARRAY:
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case LONGARRAY:
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case SWORDARRAY:
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case SLONGARRAY:
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case FLOATARRAY:
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case DOUBLEARRAY:
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break;
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default:
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goto bad;
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}
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extPtr = (char *)0;
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nInstVars = __smallIntegerVal(__ClassInstPtr(oClass)->c_ninstvars);
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nInstBytes = __OBJS2BYTES__(nInstVars);
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objSize = __Size(aByteBuffer) - OHDR_SIZE - nInstBytes;
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}
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if ((offs >= 0)
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&& (cnt >= 0)
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&& ((objSize == -1) || (objSize >= (cnt + offs)))) {
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nWritten = 0;
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do {
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int n;
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if (extPtr) {
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n = write(fd, extPtr+offs, cnt);
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} else {
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char *bp;
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191 |
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192 |
/*
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* on interrupt, anObject may be moved to another location.
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* So we recompute the byte-address here.
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*/
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bp = __ByteArrayInstPtr(aByteBuffer)->ba_element + nInstBytes;
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n = write(fd, bp + offs, cnt);
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}
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if (n > 0) {
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cnt -= n;
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offs += n;
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nWritten += n;
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} else {
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if (n < 0) {
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if (errno == EINTR) {
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continue;
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}
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break;
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}
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}
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} while (cnt > 0);
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RETURN (__mkSmallInteger(nWritten));
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}
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bad: ;
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%}.
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^ self primitiveFailed
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"
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|h buff n|
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h := self basicNew.
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h setFileDescriptor:1.
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buff := '12345678901234567890'.
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n := h writeBytes:10 from:buff startingAt:1.
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"
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229 |
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! !
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231 |
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!UnixFileDescriptorHandle methodsFor:'private accessing'!
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233 |
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setFileDescriptor:anInteger
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235 |
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%{
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if (__isSmallInteger(anInteger)) {
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__externalAddressVal(self) = (OBJ)(__smallIntegerVal(anInteger));
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}
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%}
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241 |
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242 |
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243 |
! !
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244 |
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5413
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245 |
!UnixFileDescriptorHandle methodsFor:'release'!
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4762
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246 |
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5409
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247 |
closeFile
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248 |
"close the underlying file"
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4762
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249 |
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%{
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INT fd = (INT)(__externalAddressVal(self));
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252 |
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if (fd > 0) {
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__externalAddressVal(self) = (OBJ)-1;
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close(fd);
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}
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%}.
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258 |
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! !
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260 |
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!UnixFileDescriptorHandle class methodsFor:'documentation'!
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262 |
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263 |
version
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5415
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264 |
^ '$Header: /cvs/stx/stx/libbasic/UnixFileDescriptorHandle.st,v 1.4 2000-06-24 10:45:31 cg Exp $'
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4762
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265 |
! !
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