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fs/io/FileOutputStream: add macro HAVE_O_TMPFILE

This commit is contained in:
Max Kellermann 2018-10-31 17:10:52 +01:00
parent 4b8ee58638
commit c60cf944f5
2 changed files with 11 additions and 7 deletions
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12
src/fs/io/FileOutputStream.cxx
View File

@ -138,7 +138,7 @@ FileOutputStream::Cancel() noexcept
#include <unistd.h>
#include <errno.h>
#ifdef __linux__
#ifdef HAVE_O_TMPFILE
#ifndef O_TMPFILE
/* supported since Linux 3.11 */
#define __O_TMPFILE 020000000
@ -159,12 +159,12 @@ OpenTempFile(FileDescriptor &fd, Path path)
return fd.Open(directory.c_str(), O_TMPFILE|O_WRONLY, 0666);
}
#endif /* __linux__ */
#endif /* HAVE_O_TMPFILE */
inline void
FileOutputStream::OpenCreate(bool visible)
{
#ifdef __linux__
#ifdef HAVE_O_TMPFILE
/* try Linux's O_TMPFILE first */
is_tmpfile = !visible && OpenTempFile(fd, GetPath());
if (!is_tmpfile) {
@ -175,7 +175,7 @@ FileOutputStream::OpenCreate(bool visible)
0666))
throw FormatErrno("Failed to create %s",
GetPath().c_str());
#ifdef __linux__
#ifdef HAVE_O_TMPFILE
}
#else
(void)visible;
@ -218,7 +218,7 @@ FileOutputStream::Commit()
{
assert(IsDefined());
#ifdef __linux__
#ifdef HAVE_O_TMPFILE
if (is_tmpfile) {
unlink(GetPath().c_str());
@ -251,7 +251,7 @@ FileOutputStream::Cancel() noexcept
switch (mode) {
case Mode::CREATE:
#ifdef __linux__
#ifdef HAVE_O_TMPFILE
if (!is_tmpfile)
#endif
unlink(GetPath().c_str());

6
src/fs/io/FileOutputStream.hxx
View File

@ -46,6 +46,10 @@
#include <windows.h>
#endif
#ifdef __linux__
#define HAVE_O_TMPFILE
#endif
class Path;
class FileOutputStream final : public OutputStream {
@ -57,7 +61,7 @@ class FileOutputStream final : public OutputStream {
FileDescriptor fd = FileDescriptor::Undefined();
#endif
#ifdef __linux__
#ifdef HAVE_O_TMPFILE
/**
* Was O_TMPFILE used? If yes, then linkat() must be used to
* create a link to this file.