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	ptty: add event loop to handle input and output for future tests - scroll - scr…
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	---
	commit 6010f1f28817ad49ed50eca2a0b3a8a90126fd95
	parent 4c4aa0e7eb7df99f1bcad885432141dc1cf43dc7
	Author: Jan Klemkow <[email protected]>
	Date: Wed, 15 Apr 2020 22:07:56 +0200

	ptty: add event loop to handle input and output for future tests

	Diffstat:
	M ptty.c \| 39 ++++++++++++++++++++++++++---…

	1 file changed, 33 insertions(+), 6 deletions(-)
	---
	diff --git a/ptty.c b/ptty.c
	@@ -3,6 +3,7 @@
	#include <errno.h>
	#include <inttypes.h>
	#include <limits.h>
	+#include <poll.h>
	#include <stdarg.h>
	#include <stdbool.h>
	#include <stdio.h>
	@@ -88,16 +89,42 @@ main(int argc, char *argv[])
	}

	/* parent */
	- FILE *fh = fdopen(mfd, "rw");
	- if (fh == NULL)
	- die("fdopen");

	if (closeflag && close(mfd) == -1)
	die("close:");

	- char buf[BUFSIZ];
	- while (fgets(buf, sizeof buf, fh) != NULL)
	- fputs(buf, stdout);
	+ struct pollfd pfd[2] = {
	+ { STDIN_FILENO, POLLIN, 0},
	+ { mfd, POLLIN, 0}
	+ };
	+
	+ for (;;) {
	+ char buf[BUFSIZ];
	+ ssize_t n;
	+ int r;
	+
	+ if ((r = poll(pfd, 2, -1)) == -1)
	+ die("poll:");
	+
	+ if (pfd[0].revents & POLLIN) {
	+ if ((n = read(STDIN_FILENO, buf, sizeof buf)) == -1)
	+ die("read:");
	+ if (n == 0) break;
	+ if (write(mfd, buf, n) == -1)
	+ die("write:");
	+ }
	+
	+ if (pfd[1].revents & POLLIN) {
	+ if ((n = read(mfd, buf, sizeof buf)) == -1)
	+ die("read:");
	+ if (n == 0) break;
	+ if (write(STDOUT_FILENO, buf, n) == -1)
	+ die("write:");
	+ }
	+
	+ if (pfd[0].revents & POLLHUP \|\| pfd[1].revents & POLLHUP)
	+ break;
	+ }

	int status;
	waitpid(pid, &status, 0);