banan-os/libc/sys/select.cpp

#include <sys/select.h>
#include <sys/syscall.h>
#include <unistd.h>

int pselect(int nfds, fd_set* __restrict readfds, fd_set* __restrict writefds, fd_set* __restrict errorfds, const struct timespec* __restrict timeout, const sigset_t* __restrict sigmask)
{
	sys_pselect_t arguments {
		.nfds = nfds,
		.readfds = readfds,
		.writefds = writefds,
		.errorfds = errorfds,
		.timeout = timeout,
		.sigmask = sigmask
	};
	return syscall(SYS_PSELECT, &arguments);
}

int select(int nfds, fd_set* __restrict readfds, fd_set* __restrict writefds, fd_set* __restrict errorfds, struct timeval* __restrict timeout)
{
	timespec* pts = nullptr;
	timespec ts;
	if (timeout)
	{
		ts.tv_sec = timeout->tv_sec;
		ts.tv_nsec = timeout->tv_usec * 1000;
		pts = &ts;
	}

	// TODO: "select may update timeout", should we?
	return pselect(nfds, readfds, writefds, errorfds, pts, nullptr);
}