aboutsummaryrefslogtreecommitdiffstats
path: root/erts/emulator/drivers/win32
AgeCommit message (Collapse)Author
2013-11-15Add sync option to file:open/2Joseph Blomstedt
The sync option adds the POSIX O_SYNC flag to the open system call on platforms that support the flag or its equivalent, e.g., FILE_FLAG_WRITE_THROUGH on Windows. For platforms that don't support it, file:open/2 returns {error, enotsup} if the sync option is passed in. The semantics of O_SYNC are platform-specific. For example, not all platforms guarantee that all file metadata are written to the disk along with the file data when the flag is in effect. This issue is noted in the documentation this commit adds for the sync option. Add a test for the sync option. Note however that the underlying OS semantics for O_SYNC can't be tested automatically in any practical way, so the test assumes the OS does the right thing with the flag when present. For manual verification, dtruss on OS X and strace on Linux were both run against beam processes to watch calls to open(), and file:open/2 was called in Erlang shells to open files for writing, both with and without the sync option. Both the dtruss output and the strace output showed that the O_SYNC flag was present in the open() calls when sync was specified and was clear when sync was not specified.
2013-09-12Remove ^L characters hidden randomly in the code. Not those used in text ↵Pierre Fenoll
files as delimiters. While working on a tool that processes Erlang code and testing it against this repo, I found out about those little sneaky 0xff. I thought it may be of help to other people build such tools to remove non-conforming-to-standard characters.
2013-08-23Initialize errno properly in win32 efile_may_openfilePatrik Nyblom
2013-06-12Update copyright yearsBjörn-Egil Dahlberg
2013-04-27Fix bogus DEBUGLOG() incantations in ttsl_drvAnthony Ramine
2013-02-22erts: Use correct type for ReadFile bytes readBjörn-Egil Dahlberg
Using a 64bit type for bytes read will not always clear the higher bits.
2013-01-25Update copyright yearsBjörn-Egil Dahlberg
2013-01-17Use share flags for all file operations on WindowsFilipe David Borba Manana
Some file operations provided by the Erlang file module didn't open the target file with all the file share flags. This made some concurrent file operations against the same file fail on Windows, while on other platforms such as GNU/Linux or Mac OS X they succeed. The operations will fail only if they're performed concurrently by different threads (async IO threads or scheduler threads). For example, one Erlang process does a file:delete/1 call while another Erlang process is doing a filelib:file_size/1 call. This made the former process get an eacces error from the file:delete/1 call. On GNU/Linux or Mac OS X the call would succeed. Another example is if one Erlang process attempts to open a file for reading while another one is in the middle of a file:read_file_info/1 call (after it opened the file and before it closed the file). It's easy to verify that if a file is not open with all the share flags, it's impossible for other threads (even if they belong to the same OS process) to open the file while the file is not closed by the first thread. The following test program shows this: #include <windows.h> #include <iostream> // Must be an existing file //#define SHARE_FLAGS (FILE_SHARE_READ) static DWORD WINAPI MyThreadFunction(LPVOID lpParam); static char *lastError(); int main(int argc, char *argv[]) { DWORD threadId; HANDLE threadHandle, hFile; hFile = CreateFile(FILENAME, GENERIC_READ, SHARE_FLAGS, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); if (hFile == INVALID_HANDLE_VALUE) { std::cerr << "File open error from main: " << lastError() << std::endl; return 1; } std::cout << "Main thread opened file successfully" << std::endl; threadHandle = CreateThread(NULL, 0, MyThreadFunction, NULL, 0, &threadId); if (threadHandle == INVALID_HANDLE_VALUE) { std::cerr << "Thread create error from main: " << lastError() << std::endl; return 1; } WaitForSingleObject(threadHandle, INFINITE); CloseHandle(threadHandle); CloseHandle(hFile); return 0; } static DWORD WINAPI MyThreadFunction( LPVOID lpParam ) { HANDLE hFile; hFile = CreateFile(FILENAME, GENERIC_READ, SHARE_FLAGS, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); if (hFile == INVALID_HANDLE_VALUE) { std::cerr << "File open error from second thread: " << lastError() << std::endl; return 1; } std::cout << "Second thread opened file successfully" << std::endl; CloseHandle(hFile); return 0; } static char *lastError() { static char *buf = NULL; DWORD dw = GetLastError(); if (buf != NULL) { LocalFree((LPTSTR) &buf); } FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, dw, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR) &buf, 0, NULL); return buf; } Rnning this program with SHARE_FLAGS set to 0 (as efile_fileinfo() does for e.g.), shows that the second thread is unable to open the file: C:\cygwin\home\fdmanana\tmp>touch foo.bar C:\cygwin\home\fdmanana\tmp>threads_fopen_test.exe Main thread opened file successfully File open error from second thread: The process cannot access the file because it is being used by another process. Changing the program's SHARE_FLAGS to FILE_SHARE_READ, shows that both threads are able to open the file: C:\cygwin\home\fdmanana\tmp>touch foo.bar C:\cygwin\home\fdmanana\tmp>threads_test.exe Main thread opened file successfully Second thread opened file successfully Same logic applies to opening files for writing or deleting and renaming files while they're open by some other thread that didn't specify the flags FILE_SHARE_WRITE and FILE_SHARE_DELETE.
2013-01-09Add file:allocate/3 operationFilipe David Manana
This operation allows pre-allocation of space for files. It succeeds only on systems that support such operation. The POSIX standard defines the optional system call posix_fallocate() to implement this feature. However, some systems implement more specific functions to accomplish the same operation. On Linux, if the more specific function fallocate() is implemented, it is used instead of posix_fallocate(), falling back to posix_fallocate() if the fallocate() call failed (it's only supported for the ext4, ocfs2, xfs and btrfs file systems at the moment). On Mac OS X it uses the specific fcntl() operation F_PREALLOCATE, falling back to posix_fallocate() if it's available (at the moment Mac OS X doesn't provide posix_fallocate()). On any other UNIX system, it uses posix_fallocate() if it's available. Any other system not providing this system call or any function to pre-allocate space for files, this operation always fails with the ENOTSUP POSIX error.
2012-09-07Replace sprintf with erts_snprintf in beamBjörn-Egil Dahlberg
2012-08-31Update copyright yearsBjörn-Egil Dahlberg
2012-08-30Teach VM not to dump core on long pathnamesPatrik Nyblom
Long input paths (longer than MAX_PATH) would get copied into a buffer of size MAX_PATH for read_link and altname in efile_drv. Also fixed misuse of size_t parameter as wchar_t * string length in win_efile:efile_readlink.
2012-08-14Teach caret to appear correctly after focus lossPatrik Nyblom
Incorrect window was used to calculate x position.
2011-12-20erts: rewrite efile_writev to handle partial writes correctlyRaimo Niskanen
2011-12-09Merge branch 'raimo/64-bit-driver-api/OTP-9795'Björn Gustavsson
* raimo/64-bit-driver-api/OTP-9795: (22 commits) driver_SUITE.erl: Fix sys info drivers emulator test drivers: Conform to updated driver API runtime_tools's drivers: Conform to updated driver API ws's xwe_driver.c: Conform to updated driver API megaco's flex scanner: Conform to updated driver API seq_trace_SUITE_data/echo_drv.c: Conform to updated driver API erl_interface tests: Conform port_call_drv.c updated driver API erl_drv_thread_SUITE_data/testcase_driver.c: Conform to updated driver API float_SUITE_data/fp_drv.c: Conform to updated driver API port_SUITE_data/*_drv.c: Conform to updated driver API port_bif_SUITE_data/control_drv.c: Conform to updated driver API send_term_SUITE_data/send_term_drv.c: Conform to updated driver API system_profile_SUITE_data/echo_drv.c: Conform to updated driver API trace_port_SUITE_data/echo_drv.c: Conform to updated driver API Remove support for old drivers without ERL_DRV_EXTENDED_MARKER built-in drivers: Add ERL_DRV_EXTENDED_MARKER and version numbers Bump driver version to 2.0 erl_driver.h: Enlarge type on return value from call erl_driver.h: Enlarge types on driver callbacks output, control and call erl_driver.h: Enlarge types in driver output functions ... Conflicts: erts/emulator/test/driver_SUITE_data/monitor_drv.c erts/emulator/test/driver_SUITE_data/timer_drv.c
2011-12-09built-in drivers: Add ERL_DRV_EXTENDED_MARKER and version numbersBjörn Gustavsson
2011-12-09erl_driver.h: Enlarge types on driver callbacks output, control and callRaimo Niskanen
2011-12-08Teach windows sys_localtime_rBjörn-Egil Dahlberg
2011-12-02Fix undefined ctime for invalid file handlesBjörn-Egil Dahlberg
* ctime were never defined for invalid file handles * fix epoch <-> fileinfo conversions
2011-12-02Fix EPOCH <-> FILETIME conversionBjörn-Egil Dahlberg
2011-12-02Teach win32 efile driver epochsBjörn-Egil Dahlberg
Conflicts: erts/emulator/drivers/win32/win_efile.c
2011-12-02Iron out bugs in Win64 found in daily buildsPatrik Nyblom
Almost all uses of the 'long' datatype is removed from VM and tests Emulator test now runs w/o drivers crashing Nasty abs bug fixed in VM as well as type errors in allocator debug functions Still one allocator test that fails, domain knowledge is needed to fix that. Fix type inconsistency in beam_load causing crashes
2011-12-02Build Win64 Erlang emulator using MSYSunknown
Still does not run, just compiles.
2011-11-10Remove exec bit from files related to: XML, make, CRicardo Catalinas Jiménez
2011-05-10Add error code for cyclic symbolic links and make directory links readablePatrik Nyblom
2011-03-11Update copyright yearsBjörn-Egil Dahlberg
2011-02-09Fix win32 file drivers atime/mtimeBjörn-Egil Dahlberg
When setting file_info it will now correctly set access and modified time. Previously these entities were swapped.
2010-12-09Teach win_con.c about scroll wheelsPatrik Nyblom
2010-11-30Teach filelib to use re in unicode mode when filenames are not rawPatrik Nyblom
2010-11-30Adapt new soft and hard link routines on Windos to UnicodePatrik Nyblom
Also close find-handles in altname and other minor corrections to patch
2010-11-30Make Unicode filenames work on WindowsPatrik Nyblom
2010-11-29Merge branch 'jr/windows-file-append' into devPatrik Nyblom
* jr/windows-file-append: Fix appending to large files (>4GB) on Windows OTP-8958
2010-10-14Add Win32 support for hard and symbolic file system linksBlaine Whittle
Hard linking requires XP or later and a NTFS formatted drive. Symbolic linking requires Windows Vista, Windows Server 2008, Windows 7 or later. Symbolic linking on earlier versions of Windows will return {error, enotsup}. file:make_link/2, file:make_sym_link/2 and file:read_link/1 are all implemented. file:read_file_info/1 does NOT return the number of hard links on the file as this results in performance problems for read_file_info/1, however this can be enabled by uncommenting a few lines of code. The original path was submitted on 9/2/2009 by Alex Tearse-Doyle.
2010-09-30Fix appending to large files (>4GB) on WindowsJuhani Rankimies
Append mode doesn't work for files larger that 4GB on Windows. Caused by incorrect usage of SetFilePointer in win_efile.c. Fix uses OVERLAPPED structure to specify write position (EOF). http://msdn.microsoft.com/en-us/library/aa365747.aspx Opening file in append mode was also considered, but rejected, because it might cause backwards incompatibility by limiting applicable operations on the descriptor. SetFilePointerEx was not used because it would caused more system calls than using OVERLAPPED structure.
2010-08-17erts: Remove the unused mem_drv driverBjörn Gustavsson
The mem_drv driver was only useful when elib_malloc was active.
2010-06-04Support opening files in exclusive modeMichael Santos
Add an option that atomically tests for the existence of a file and creates it if the file does not exist, by passing the O_EXCL flag to open() on Unix and CREATE_NEW flag on Windows. Support for O_EXCL varies across platforms and filesystems. {ok, Fd} = file:open("/tmp/foo", [write,exclusive]), {error, eexist} = file:open("/tmp/foo", [write,exclusive]).
2010-06-02Windows: Open files with FILE_SHARE_DELETE to get closer to UNIX semanticsJan Lehnardt
See dwShareMode on http://msdn.microsoft.com/en-us/library/aa363858(VS.85).aspx
2010-05-24Merge branch 'fm/file-operations' into devErlang/OTP
* fm/file-operations: Update preloaded modules Add file:advise/4 - a wrapper to the POSIX syscall posix_fadvise Add file:datasync/1 for syncing file contents only sys.h: Correct the get_int64() macro OTP-8637 fm/file-operations The functions file:advise/4 and file:datasync/1 have been added. (Thanks to Filipe David Manana.)
2010-05-20Add file:advise/4 - a wrapper to the POSIX syscall posix_fadviseFilipe David Manana
Useful for informing the Operating System about the access pattern for a file's data, so that it can adapt the caching strategy to maximize disk IO performance.
2010-05-20Add file:datasync/1 for syncing file contents onlyFilipe David Manana
file:datasync/1 invokes the POSIX system call "int fdatasync(int fd)". This system call is similar to "fsync" but, unlike fsync, it does not update the metadata associated with the file (like the access time for example). It's used by many DBMSs (MySQL and SQLite of example) to increase disk IO performance, as it avoids disk seeks and disk write operations compared to fsync. More details on it at: http://linux.die.net/man/2/fdatasync An example, from the MySQL source: http://bazaar.launchpad.net/~mysql/mysql-server/mysql-5.1-telco-6.1/annotate/head%3A/mysys/my_sync.c#L61 This new function just calls fsync on systems not implementing fdatasync.
2009-11-20The R13B03 release.OTP_R13B03Erlang/OTP
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 19:06:07 +0000