ptty: add event loop to handle input and output for future tests - scroll - scrollbackbuffer program for st
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---
(DIR) commit 6010f1f28817ad49ed50eca2a0b3a8a90126fd95
(DIR) parent 4c4aa0e7eb7df99f1bcad885432141dc1cf43dc7
(HTM) Author: Jan Klemkow <j.klemkow@wemelug.de>
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(-)
---
(DIR) 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);