// writer1 - send messages to a FIFO

#include "yadda.h"

int
main(int argc, char *argv[])
{
	char *fname, *message;
	int fd, exit_status = 0;
	size_t len;
	ssize_t amount;

	if (argc != 3) {
		fputs("Usage: writer1 fifo-name message\n", stderr);
		exit(1);
	}
	fname   = argv[1];
	message = argv[2];
	if ((len = strlen(message)) > MSG_MAX) {
		warnx("message is too long, truncating");
		len         = MSG_MAX;
		exit_status = 2;
	}

#ifdef __OpenBSD__
	if (pledge("dpath stdio rpath wpath unveil", NULL) == -1)
		err(1, "pledge");
	if (unveil(fname, "cw") == -1) err(1, "unveil");
	if (unveil(NULL, NULL) == -1) err(1, "unveil");
#endif

	if (mkfifo(fname, 0600) == -1 && errno != EEXIST)
		err(1, "mkfifo '%s'", fname);
	fd = open(fname, O_WRONLY | O_NDELAY);
	// whoops, there is no reader
	if (fd == -1) err(1, "open '%s'", fname);

	if ((amount = write(fd, message, len)) == -1) err(1, "write");
	if ((size_t) amount != len) {
		warnx("incomplete write (%ld,%lu)", amount, len);
		exit_status = 2;
	}
	exit(exit_status);
}