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/*
* This source code is released into the public domain.
*/
module;
#include <coroutine>
#include <expected>
#include <format>
#include <string>
#include <utility>
#include <err.h>
#include <fcntl.h>
#include <unistd.h>
extern char **environ;
module nihil.posix;
import nihil.error;
import nihil.monad;
namespace nihil {
fexecv::fexecv(fd &&execfd, argv &&args) noexcept
: m_execfd(std::move(execfd))
, m_args(std::move(args))
{
}
auto fexecv::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))));
}
fexecv::fexecv(fexecv &&) noexcept = default;
auto fexecv::operator=(this fexecv &, fexecv &&) noexcept -> fexecv& = default;
auto execv(std::string_view path, argv &&argv)
-> std::expected<fexecv, error>
{
auto file = co_await open(path, O_EXEC)
.transform_error([&] (error cause) {
return error(std::format("could not open {}", path),
std::move(cause));
});
co_return fexecv(std::move(file), std::move(argv));
}
auto execvp(std::string_view file, argv &&argv)
-> std::expected<fexecv, error>
{
auto execfd = find_in_path(file);
if (!execfd)
return std::unexpected(error(
std::format("executable not found in path: {}", file)));
return fexecv(std::move(*execfd), std::move(argv));
}
auto shell(std::string_view const &command)
-> std::expected<fexecv, error>
{
return execl("/bin/sh", "sh", "-c", command);
}
} // namespace nihil
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