A Go package for implementing a FUSE file system (fork with 'almost' zero-copy read/write)
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fusego/writev.go

29 lines
512 B

package fuse
import (
"syscall"
"unsafe"
)
func writev(fd int, packet [][]byte) (n int, err error) {
iovecs := make([]syscall.Iovec, 0, len(packet))
for _, v := range packet {
if len(v) == 0 {
continue
}
vec := syscall.Iovec{
Base: &v[0],
}
vec.SetLen(len(v))
iovecs = append(iovecs, vec)
}
n1, _, e1 := syscall.Syscall(
syscall.SYS_WRITEV,
uintptr(fd), uintptr(unsafe.Pointer(&iovecs[0])), uintptr(len(iovecs)),
)
n = int(n1)
if e1 != 0 {
err = syscall.Errno(e1)
}
return
}