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only call ioctl to export new termsize if process is in the foreground

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Closes #4477.

(cherry picked from commit 216c4b811a)
This commit is contained in:
David Adam 2017-10-16 12:13:30 +08:00
parent ac79a6b0c7
commit 805e4b31a1
1 changed files with 4 additions and 1 deletions
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5
src/common.cpp
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@ -1592,7 +1592,10 @@ static void export_new_termsize(struct winsize *new_termsize) {
env_set(L"LINES", buf, ENV_GLOBAL | (lines.missing_or_empty() ? 0 : ENV_EXPORT));
#ifdef HAVE_WINSIZE
ioctl(STDOUT_FILENO, TIOCSWINSZ, new_termsize);
// Only write the new terminal size if we are in the foreground (#4477)
if (tcgetpgrp(STDOUT_FILENO) == getpgrp()) {
ioctl(STDOUT_FILENO, TIOCSWINSZ, new_termsize);
}
#endif
}