| 1 | //===-- Implementation file for writev ------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | #include "src/sys/uio/writev.h" |
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| 9 | #include "hdr/types/ssize_t.h" |
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| 10 | #include "hdr/types/struct_iovec.h" |
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| 11 | #include "src/__support/OSUtil/syscall.h" |
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| 12 | #include "src/__support/common.h" |
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| 13 | #include "src/__support/libc_errno.h" |
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| 14 | #include <sys/syscall.h> |
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| 15 | |
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| 16 | namespace LIBC_NAMESPACE_DECL { |
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| 17 | |
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| 18 | LLVM_LIBC_FUNCTION(ssize_t, writev, (int fd, const iovec *iov, int iovcnt)) { |
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| 19 | long ret = LIBC_NAMESPACE::syscall_impl<long>(SYS_writev, fd, iov, iovcnt); |
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| 20 | // On failure, return -1 and set errno. |
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| 21 | if (ret < 0) { |
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| 22 | libc_errno = static_cast<int>(-ret); |
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| 23 | return -1; |
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| 24 | } |
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| 25 | // On success, return number of bytes written. |
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| 26 | return static_cast<ssize_t>(ret); |
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| 27 | } |
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| 28 | |
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| 29 | } // namespace LIBC_NAMESPACE_DECL |
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| 30 | |
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