lowat-dgram.c
glebius (Gleb Smirnoff)
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	glebius
	Jun 2 2022, 6:42 PM

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649 B

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lowat-dgram.c
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	#include <sys/types.h>
	#include <sys/select.h>
	#include <sys/socket.h>
	#include <stdio.h>
	#include <err.h>

	static int fd[2];

	void
	test(void)
	{
	char buf[50];
	fd_set rfds;

	if (send(fd[0], buf, 50, 0) != 50)
	err(1, "send");

	FD_ZERO(&rfds);
	FD_SET(fd[1], &rfds);
	if (select(fd[1] + 1, &rfds, NULL, NULL, NULL) != 1)
	err(1, "select");

	if (recv(fd[1], buf, 50, 0) != 50)
	err(1, "receive");
	}

	int
	main(int argc, char *argv[])
	{
	int v;

	if (socketpair(PF_UNIX, SOCK_DGRAM, 0, fd) != 0)
	err(1, "socketpair");

	test();

	v = 100;
	if (setsockopt(fd[1], SOL_SOCKET, SO_RCVLOWAT, &v, sizeof(v)) != 0)
	err(1, "setsockopt");

	test();
	}