func cgoNameinfoPTR(b []byte, sa *syscall.RawSockaddr, salen syscall.Socklen_t) (int, error) {
syscall.Entersyscall()
gerrno := libc_getnameinfo(sa, salen, &b[0], syscall.Size_t(len(b)), nil, 0, syscall.NI_NAMEREQD)
syscall.Exitsyscall()
var err error
if gerrno == syscall.EAI_SYSTEM {
errno := syscall.GetErrno()
if errno != 0 {
err = errno
}
}
return gerrno, err
}
func (k bufferKind) initialSize() syscall.Size_t {
sz, _ := syscall.Sysconf(int(k))
if sz == -1 {
// DragonFly and FreeBSD do not have _SC_GETPW_R_SIZE_MAX.
// Additionally, not all Linux systems have it, either. For
// example, the musl libc returns -1.
return 1024
}
if !isSizeReasonable(int64(sz)) {
// Truncate. If this truly isn't enough, retryWithBuffer will error on the first run.
return maxBufferSize
}
return syscall.Size_t(sz)
}