dgrove@google.com
4c0f559d23
git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@15 260f80e4-7a28-3924-810f-c04153c831b5
105 lines
2.7 KiB
C++
105 lines
2.7 KiB
C++
// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include "bin/fdutils.h"
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bool FDUtils::SetNonBlocking(intptr_t fd) {
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intptr_t status;
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status = fcntl(fd, F_GETFL);
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if (status < 0) {
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perror("fcntl F_GETFL failed");
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return false;
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}
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status = (status | O_NONBLOCK);
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if (fcntl(fd, F_SETFL, status) < 0) {
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perror("fcntl F_SETFL failed");
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return false;
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}
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return true;
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}
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bool FDUtils::IsBlocking(intptr_t fd, bool* is_blocking) {
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intptr_t status;
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status = fcntl(fd, F_GETFL);
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if (status < 0) {
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perror("fcntl F_GETFL failed");
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return false;
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}
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*is_blocking = (status & O_NONBLOCK) == 0;
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return true;
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}
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intptr_t FDUtils::AvailableBytes(intptr_t fd) {
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size_t available;
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int result = ioctl(fd, FIONREAD, &available);
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if (result < 0) {
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return result;
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}
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return available;
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}
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ssize_t FDUtils::ReadFromBlocking(int fd, void* buffer, size_t count) {
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#ifdef DEBUG
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bool is_blocking = false;
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ASSERT(FDUtils::IsBlocking(fd, &is_blocking));
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ASSERT(is_blocking);
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#endif
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size_t remaining = count;
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char* buffer_pos = reinterpret_cast<char*>(buffer);
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while (remaining > 0) {
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ssize_t bytes_read = read(fd, buffer_pos, remaining);
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if (bytes_read == 0) {
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return count - remaining;
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} else if (bytes_read == -1 && errno != EINTR) {
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// Error codes EAGAIN and EWOULDBLOCK should only happen for non
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// blocking file descriptors.
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ASSERT(errno != EAGAIN && errno != EWOULDBLOCK);
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return -1;
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} else if (bytes_read > 0) {
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remaining -= bytes_read;
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buffer_pos += bytes_read;
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} else {
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ASSERT(errno == EINTR);
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}
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}
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return count;
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}
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ssize_t FDUtils::WriteToBlocking(int fd, const void* buffer, size_t count) {
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#ifdef DEBUG
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bool is_blocking = false;
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ASSERT(FDUtils::IsBlocking(fd, &is_blocking));
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ASSERT(is_blocking);
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#endif
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size_t remaining = count;
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char* buffer_pos = const_cast<char*>(reinterpret_cast<const char*>(buffer));
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while (remaining > 0) {
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ssize_t bytes_written = write(fd, buffer_pos, remaining);
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if (bytes_written == 0) {
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return count - remaining;
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} else if (bytes_written == -1 && errno != EINTR) {
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// Error codes EAGAIN and EWOULDBLOCK should only happen for non
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// blocking file descriptors.
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ASSERT(errno != EAGAIN && errno != EWOULDBLOCK);
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return -1;
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} else if (bytes_written > 0) {
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remaining -= bytes_written;
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buffer_pos += bytes_written;
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} else {
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ASSERT(errno == EINTR);
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}
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}
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return count;
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}
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