From b5bf6d68bdde5f5db1d72179f4e20dc1e21d20c4 Mon Sep 17 00:00:00 2001 From: Markus Goetz Date: Mon, 30 Nov 2009 15:28:47 +0100 Subject: Unix: Avoid stat() when opening a file The open() syscall can open directories for reading, which we in QFile and file engines don't support. However, there is no need for stat() to find out if it is a directory if we open() with a write flag because then the syscall will fail anyway. Reviewed-by: joao --- src/corelib/io/qfsfileengine_unix.cpp | 32 ++++++++++++++++++++------------ tests/auto/qfile/tst_qfile.cpp | 13 ++++++++++++- 2 files changed, 32 insertions(+), 13 deletions(-) diff --git a/src/corelib/io/qfsfileengine_unix.cpp b/src/corelib/io/qfsfileengine_unix.cpp index 8cbf6a3..71414ce 100644 --- a/src/corelib/io/qfsfileengine_unix.cpp +++ b/src/corelib/io/qfsfileengine_unix.cpp @@ -191,12 +191,16 @@ bool QFSFileEnginePrivate::nativeOpen(QIODevice::OpenMode openMode) return false; } - QT_STATBUF statBuf; - if (QT_FSTAT(fd, &statBuf) != -1) { - if ((statBuf.st_mode & S_IFMT) == S_IFDIR) { - q->setError(QFile::OpenError, QLatin1String("file to open is a directory")); - QT_CLOSE(fd); - return false; + if (!(openMode & QIODevice::WriteOnly)) { + // we don't need this check if we tried to open for writing because then + // we had received EISDIR anyway. + QT_STATBUF statBuf; + if (QT_FSTAT(fd, &statBuf) != -1) { + if ((statBuf.st_mode & S_IFMT) == S_IFDIR) { + q->setError(QFile::OpenError, QLatin1String("file to open is a directory")); + QT_CLOSE(fd); + return false; + } } } @@ -230,12 +234,16 @@ bool QFSFileEnginePrivate::nativeOpen(QIODevice::OpenMode openMode) return false; } - QT_STATBUF statBuf; - if (QT_FSTAT(fileno(fh), &statBuf) != -1) { - if ((statBuf.st_mode & S_IFMT) == S_IFDIR) { - q->setError(QFile::OpenError, QLatin1String("file to open is a directory")); - fclose(fh); - return false; + if (!(openMode & QIODevice::WriteOnly)) { + // we don't need this check if we tried to open for writing because then + // we had received EISDIR anyway. + QT_STATBUF statBuf; + if (QT_FSTAT(fileno(fh), &statBuf) != -1) { + if ((statBuf.st_mode & S_IFMT) == S_IFDIR) { + q->setError(QFile::OpenError, QLatin1String("file to open is a directory")); + fclose(fh); + return false; + } } } diff --git a/tests/auto/qfile/tst_qfile.cpp b/tests/auto/qfile/tst_qfile.cpp index cf46ce1..7ee5665 100644 --- a/tests/auto/qfile/tst_qfile.cpp +++ b/tests/auto/qfile/tst_qfile.cpp @@ -2783,10 +2783,21 @@ void tst_QFile::mapOpenMode() void tst_QFile::openDirectory() { - QFile f1("resources"); + QFile f1(SRCDIR "resources"); + // it's a directory, it must exist + QVERIFY(f1.exists()); + + // ...but not be openable QVERIFY(!f1.open(QIODevice::ReadOnly)); f1.close(); QVERIFY(!f1.open(QIODevice::ReadOnly|QIODevice::Unbuffered)); + f1.close(); + QVERIFY(!f1.open(QIODevice::ReadWrite)); + f1.close(); + QVERIFY(!f1.open(QIODevice::WriteOnly)); + f1.close(); + QVERIFY(!f1.open(QIODevice::WriteOnly|QIODevice::Unbuffered)); + f1.close(); } void tst_QFile::openStandardStreams() -- cgit v0.12