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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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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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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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An incorrect spec, rpc:yield/1, has been fixed.
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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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Signed-off-by: Tuncer Ayaz <[email protected]>
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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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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.
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