[apache/incubator-teaclave-sgx-sdk] Repair "write_vectored "caused segmentfault (#257)

[Zha0Chan <no...@github.com>]

`      let f = File::create("foo.txt");
        assert!(f.is_ok());
        let send = b"Hello, World!";
        let vecs = [IoSlice::new(&send[..]),
        IoSlice::new(&send[..])];
        let result = f.unwrap().write_vectored(&vecs);`

Using this test case will result in a segmentfault, which is caused by the "**copy_nonoverlapping**" parameter error in the "**writev**" or "**pwritev64**" in the SDK
You can view, comment on, or merge this pull request online at:

  https://github.com/apache/incubator-teaclave-sgx-sdk/pull/257

-- Commit Summary --

  * Repair "write_vectored "caused segment error

-- File Changes --

    M sgx_libc/src/linux/x86_64/ocall.rs (30)

-- Patch Links --

https://github.com/apache/incubator-teaclave-sgx-sdk/pull/257.patch
https://github.com/apache/incubator-teaclave-sgx-sdk/pull/257.diff

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Re: [apache/incubator-teaclave-sgx-sdk] fix "write_vectored "caused segmentfault (#257)

[Yu Ding <no...@github.com>]

Merged #257 into master.

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Re: [apache/incubator-teaclave-sgx-sdk] fix "write_vectored "caused segmentfault (#257)

[Yu Ding <no...@github.com>]

thanks!!

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