ager@google.com
c3f89c46ec
The signal handler could unblock the main thread. The main thread could delete the Process object the signal handler is holding a pointer to. The signal handler could then close a file descriptor it got from the deleted memory. The whole process exit handling infrastructure is pretty fragile. We should attempt to come up with something simpler. R=sgjesse@google.com BUG= TEST= Review URL: https://chromiumcodereview.appspot.com//9225019 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@3652 260f80e4-7a28-3924-810f-c04153c831b5
110 lines
2.9 KiB
C++
110 lines
2.9 KiB
C++
// Copyright (c) 2012, 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 = TEMP_FAILURE_RETRY(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 (TEMP_FAILURE_RETRY(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 = TEMP_FAILURE_RETRY(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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int available; // ioctl for FIONREAD expects an 'int*' argument.
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int result = TEMP_FAILURE_RETRY(ioctl(fd, FIONREAD, &available));
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if (result < 0) {
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perror("ioctl FIONREAD failed");
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return result;
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}
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#ifdef DEBUG
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ASSERT(available >= 0);
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#endif
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return static_cast<intptr_t>(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 = TEMP_FAILURE_RETRY(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) {
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ASSERT(EAGAIN == EWOULDBLOCK);
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// Error code EWOULDBLOCK should only happen for non blocking
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// file descriptors.
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ASSERT(errno != EWOULDBLOCK);
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return -1;
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} else {
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ASSERT((bytes_read > 0));
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remaining -= bytes_read;
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buffer_pos += bytes_read;
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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 =
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TEMP_FAILURE_RETRY(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) {
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ASSERT(EAGAIN == EWOULDBLOCK);
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// Error code EWOULDBLOCK should only happen for non blocking
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// file descriptors.
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ASSERT(errno != EWOULDBLOCK);
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return -1;
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} else {
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ASSERT(bytes_written > 0);
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remaining -= bytes_written;
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buffer_pos += bytes_written;
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}
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}
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return count;
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}
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