mirror of https://github.com/ceph/go-ceph
61 lines
1.2 KiB
Go
61 lines
1.2 KiB
Go
package cutil
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/*
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#include <stdlib.h>
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#include <sys/uio.h>
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*/
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import "C"
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import (
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"unsafe"
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)
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// Iovec is a slice of iovec structs. Might have allocated C memory, so it must
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// be freed with the Free() method.
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type Iovec struct {
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iovec []C.struct_iovec
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sbs []*SyncBuffer
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}
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const iovecSize = C.sizeof_struct_iovec
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// ByteSlicesToIovec creates an Iovec and links it to Go buffers in data.
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func ByteSlicesToIovec(data [][]byte) (v Iovec) {
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n := len(data)
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iovecMem := C.malloc(iovecSize * C.size_t(n))
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v.iovec = (*[MaxIdx]C.struct_iovec)(iovecMem)[:n:n]
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for i, b := range data {
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sb := NewSyncBuffer(CPtr(&v.iovec[i].iov_base), b)
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v.sbs = append(v.sbs, sb)
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v.iovec[i].iov_len = C.size_t(len(b))
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}
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return
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}
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// Sync makes sure the slices contain the same as the C buffers
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func (v *Iovec) Sync() {
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for _, sb := range v.sbs {
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sb.Sync()
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}
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}
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// Pointer returns a pointer to the iovec
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func (v *Iovec) Pointer() unsafe.Pointer {
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return unsafe.Pointer(&v.iovec[0])
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}
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// Len returns a pointer to the iovec
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func (v *Iovec) Len() int {
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return len(v.iovec)
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}
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// Free the C memory in the Iovec.
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func (v *Iovec) Free() {
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for _, sb := range v.sbs {
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sb.Release()
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}
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if len(v.iovec) != 0 {
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C.free(unsafe.Pointer(&v.iovec[0]))
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}
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v.iovec = nil
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}
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