telnet/SOURCES/telnet-0.17-pty-retry.patch

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2021-11-03 20:51:13 +00:00
--- a/telnetd/telnetd.c
+++ b/telnetd/telnetd.c
@@ -772,7 +772,6 @@ void telnet(int f, int p)
int on = 1;
char *HE;
const char *IM;
- int pty_read_ok = 0; /* track whether the pty read has worked yet */
/*
* Initialize the slc mapping table.
@@ -1086,19 +1085,24 @@ void telnet(int f, int p)
* Something to read from the pty...
*/
if (FD_ISSET(p, &ibits)) {
+ int eio = 0;
+read_pty:
pcc = read(p, ptyibuf, BUFSIZ);
- /*
- * On some systems, if we try to read something
- * off the master side before the slave side is
- * opened, we get EIO.
- */
- if (pcc < 0 && (errno == EWOULDBLOCK || (errno == EIO && pty_read_ok == 0))) {
+ if (pcc < 0 && errno == EWOULDBLOCK) {
pcc = 0;
}
+ /*
+ * If we try to read something off the master side while the slave
+ * side is temporarily closed by login process, we get EIO.
+ */
+ else if (pcc < 0 && errno == EIO && eio < 1000) {
+ eio++;
+ poll(NULL, 0, 10);
+ goto read_pty;
+ }
else {
if (pcc <= 0)
break;
- pty_read_ok = 1; /* mark connection up for read */
#ifdef LINEMODE
/*
* If ioctl from pty, pass it through net