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// This source code is released into the public domain.
module;
#include <expected>
#include <string>
#include "nihil.hh"
export module nihil.posix:fexecv;
import nihil.error;
import :argv;
import :executor;
import :fd;
namespace nihil {
#ifdef NIHIL_HAVE_FEXECVE
/*
* fexecv: use a file descriptor and an argument vector to call ::fexecve().
* This is the lowest-level executor which all others are implemented
* in terms of (if it's available).
*
* TODO: Should have a way to pass the environment (envp).
*/
export struct fexecv final
{
using tag = exec_tag;
fexecv(fd &&execfd, argv &&args) noexcept
: m_execfd(std::move(execfd))
, m_args(std::move(args))
{
}
[[nodiscard]] auto exec(this fexecv &self) -> std::expected<void, error>
{
::fexecve(self.m_execfd.get(), self.m_args.data(), environ);
return std::unexpected(error("fexecve failed", error(std::errc(errno))));
}
// Movable
fexecv(fexecv &&) noexcept = default;
auto operator=(this fexecv &, fexecv &&) noexcept -> fexecv & = default;
// Not copyable (because we hold the open fd object)
fexecv(fexecv const &) = delete;
auto operator=(this fexecv &, fexecv const &) -> fexecv & = delete;
private:
fd m_execfd;
argv m_args;
};
#endif // NIHIL_HAVE_FEXECVE
} // namespace nihil
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