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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.
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Expect modifications, additions and corrections.
There is a kludge in file_io_server and
erl_scan:continuation_location() that's not so pleasing.
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The mode() type is used in path_open and copy, two functions that
do _not_ accept the ram option (or is at least not supposed to),
why I moved the option 'ram' from the type down to the spec for
open itself. That also makes the option visible directly under open/2
in the documentation.
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* maint:
Fix chunk usage check
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Conflicts:
erts/emulator/beam/beam_emu.c
erts/emulator/beam/bif.tab
erts/preloaded/ebin/prim_file.beam
lib/hipe/cerl/erl_bif_types.erl
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User tags in a dynamic trace enabled VM are spread throughout the system
in the same way as seq_trace tokens. This is used by the file module
and various other modules to get hold of the tag from the user process
without changing the protocol.
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Add probes to (mostly) the efile_drv.c driver and other
file I/O-related source files.
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* ta/sendfile/OTP-9240:
Do not use async threads on DARWIN
Fix cleanup when sendfile process crashes
Return {error,closed} from sendfile if closed
Do not use SFV_NOWAIT as it does not exist on all solaris
Clarify some code comments
Make solaris use sendfilev
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* egil/file-info-opt-utc/OTP-7687: (39 commits)
Remove time_t specific test in prim_file_SUITE
Update prim_file.beam and prim_zip.beam
Add types for posixtime_to_universaltime and the reverse
Set BASEYEAR to 1902
Set lower limit of years handled to 1601
Emulate localtime, gmtime and mktime to enable negative time_t
Document file:*_file_info/2
Fix compiler warning in unix_efile.c
Change name of bif universaltime_to_seconds/1
Change options to prim_file:*_file_info/*
Remove dead code
Catch errors from prim_file:*_file_info
Testcase for utc <-> seconds conversion
Fix negative time in seconds_to_universaltime/1
Remove OS taint from datetime conversion
Add utc <-> seconds conversions bifs
Let prim_file validate ctime in file_info
Teach #file_info spec unix epochs for file times
Add file_info_opt tests in prim_file_SUITE
unix_efile: Zero is a valid number in utime
...
Conflicts:
erts/emulator/beam/erl_time_sup.c
erts/emulator/sys/win32/erl_win_sys.h
erts/emulator/sys/win32/sys_time.c
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* file:read_file_info/2
* file:write_file_info/3
Document options and time behavior.
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If the socket is closed by the remote end, sendfile
now returns {error,closed}.
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* ta/docs:
Fix misspelling of chosen
Fix typos in erl(1)
Fix misspelling of 'turn off'
Fix typo in reltool(3)
Fix typo in gen_sctp(3)
Fix typo in mod_responsecontrol.erl
Fix typo in erts_alloc(3)
Fix typos in ssl_cipher.erl
Fix typos in expressions.xml
file: correct make_link/2 and make_symlink/2 docs
Fix typo in test_server(3)
Fix typos in io_protocol.xml
Fix typo in erlang(3)
Fix typos in tar_SUITE
Fix typos in erts/preloaded/src
OTP-9787
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* ao/fix-change-time-inval-dates:
Fix a crash when file:change_time/2,3 are called with invalid dates
OTP-9785
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Since the API for headers/trailers seem to be very awkward to
work with when using non-blocking io the feature is dropped
for now. See unix_efile.c for more details.
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Since sendfile could in theory be used to send to any type
of file descriptor in *nix, it is a better fit to have it
in file.
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Created erlang fallback for sendfile in gen_tcp and
moved sendfile from file to gen_tcp. Also created testcases
for testing all different options to sendfile.
For info about how sendfile should work see the BSD man pages
as they contain a more complete API than other *nixes.
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Allow Erlang code to use sendfile() where available by wrapping it as
file:sendfile/4 and file:sendfile/2.
sendfile(2) - Linux man page:
"sendfile() copies data between one file descriptor and another.
Because this copying is done within the kernel, sendfile() is more
efficient than the combination of read(2) and write(2), which would
require transferring data to and from user space."
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Calling file:change_time/2,3 with an invalid date tuple
(e.g file:change_time("file.txt", {undefined, undefined}))
will cause file_server_2 to crash.
error_logger will shutdown and the whole VM will stop.
Change behavior to validate given dates on system boundaries.
(i.e before issuing a server call).
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In the location information tables in the run-time system, source
filenames that are the same as the module name plus ".erl" extension
are not stored explicitly, thus saving memory.
To take advantage of that optimization, avoid complicating the names of
files in the current working directory; specifically, make sure that
"./" is not prepended to the name.
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An incorrect spec, rpc:yield/1, has been fixed.
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Change type for second parameter from binary() to iodata(), since the
function explicitly takes steps to accept lists as well as binaries.
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* ks/erl_bif_types-cleanup/OTP-8961:
Fix type information of 'file' and 'code' modules
Conflicts:
lib/hipe/cerl/erl_bif_types.erl
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Dialyzer for a long time now has had hard-coded type information about
key functions of the 'file' and 'code' modules in 'erl_bif_types'.
Some of this information was not up-to-date according to the published
Erlang/OTP documentation, while some other part contained small errors.
Now that specs are available, this information should be moved to the
corresponding files, not be hard-coded in erl_bif_types.
This change takes out all information for the 'file' module and fixes
some small errors in type information for the 'code' module.
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Although the {encoding, encoding()} set of options is documented in
the manual page of the 'file' module, they do not appear in the Mode
description on that page nor in the mode() type declaration.
The patch adds this information in both the code of the module and
the documentation of the module.
To avoid duplication, the declaration of the encoding() type is added
to the 'unicode' module where it most probably belongs.
While at it, added a proper declaration for posix(), took out the
now superfluous information about the types of file:open/2 from the
erl_bif_types module, and corrected the return type of file:open/2
so that it corresponds to the published documentation.
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* ms/file-exclusive-mode:
Update preloaded modules
Support opening files in exclusive mode
OTP-8670 ms/file-exclusive-mode
There is a new option 'exclusive' to file:open/2 that uses the OS O_EXCL
flag where supported to open the file in exclusive mode.
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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]).
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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.
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