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44864: Avoid inifinite loop in tty init.

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If we can't grab the terminal in interactive mode, give
up after 100 goes.  This is a completely arbitrary choice;
we simply don't know what in the system could change the
result of looping further.
This commit is contained in:
Peter Stephenson 2019-10-28 11:56:19 +00:00
parent 5be28dac5d
commit 8c25d92e11
2 changed files with 20 additions and 2 deletions
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4
ChangeLog
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@ -1,5 +1,9 @@
2019-10-28 Peter Stephenson <p.stephenson@samsung.com>
* 44864: Src/jobs.c: Avoid infinite loop in interactive mode
when trying to grab terminal. Fail after 100 goes (arbitrary
choice).
* Sebastian: 44865: configure.ac: Try harder to link in curses
even if not needed for termcap variables.

18
Src/jobs.c
View file

@ -2933,6 +2933,7 @@ acquire_pgrp(void)
sigaddset(&blockset, SIGTTOU);
sigaddset(&blockset, SIGTSTP);
oldset = signal_block(blockset);
int loop_count = 0;
while ((ttpgrp = gettygrp()) != -1 && ttpgrp != mypgrp) {
mypgrp = GETPGRP();
if (mypgrp == mypid) {
@ -2948,8 +2949,21 @@ acquire_pgrp(void)
if (read(0, NULL, 0) != 0) {} /* Might generate SIGT* */
signal_block(blockset);
mypgrp = GETPGRP();
if (mypgrp == lastpgrp && !interact)
break; /* Unlikely that pgrp will ever change */
if (mypgrp == lastpgrp) {
if (!interact)
break; /* Unlikely that pgrp will ever change */
if (++loop_count == 100)
{
/*
* It's time to give up. The count is arbitrary;
* this is just to fix up unusual cases, so it's
* left large in an attempt not to break normal
* cases where there's some delay in the system
* setting up the terminal.
*/
break;
}
}
lastpgrp = mypgrp;
}
if (mypgrp != mypid) {