std.os read/write functions + sendfile#4612
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This changset adds a `sendfile(2)` syscall bindings to the linux bits component. Where available, the `sendfile64(2)` syscall will be transparently called. A wrapping function has also been added to the std.os to transform errno returns to Zig errors. Change-Id: I86769fc4382c0771e3656e7b21137bafd99a4411
* rework os.sendfile and add macosx support, and a fallback implementation for any OS. * fix sendto compile error * std.os write functions support partial writes. closes #3443. * std.os pread / pwrite functions can now return `error.Unseekable`. * std.fs.File read/write functions now have readAll/writeAll variants which loop to complete operations even when partial reads/writes happen. * Audit std.os read/write functions with respect to Linux returning EINVAL for lengths greater than 0x7fff0000. * std.os read/write shim functions do not unnecessarily loop. Since partial reads/writes are part of the API, the caller will be forced to loop anyway, and so that would just be code bloat. * Improve doc comments * Add a non-trivial test for std.os.sendfile * Fix std.os.pread on 32 bit Linux * Add missing SYS_sendfile bit on aarch64
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What about |
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That will be a nice separate enhancement |
daurnimator
reviewed
Mar 3, 2020
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| else => { | ||
| _ = unexpectedErrno(err); | ||
| const discard = unexpectedErrno(err); |
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Why does this need an assignment?
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hrm. why don't we support discarding error values (not error unions) via assignment to _?
andrewrk
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the
breaking
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FYI this broke zig hello world examples all over the place as |
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Shouldn't this optimization also exist on |
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This merges #4131 and then does the following:
implementation for any OS.
error.Unseekable.which loop to complete operations even when partial reads/writes
happen.
EINVAL for lengths greater than 0x7fff0000.
partial reads/writes are part of the API, the caller will be forced
to loop anyway, and so that would just be code bloat.