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build: block SIGTTOU before calling tcsetattr() #28535

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build: block SIGTTOU before calling tcsetattr() #28535

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14 changes: 10 additions & 4 deletions src/node.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -688,14 +688,20 @@ void ResetStdio() {
}

if (s.isatty) {
sigset_t sa;
int err;

// We might be a background job that doesn't own the TTY so block SIGTTOU
// before making the tcsetattr() call, otherwise that signal suspends us.
sigemptyset(&sa);
sigaddset(&sa, SIGTTOU);

CHECK_EQ(0, pthread_sigmask(SIG_BLOCK, &sa, nullptr));
do
err = tcsetattr(fd, TCSANOW, &s.termios);
while (err == -1 && errno == EINTR); // NOLINT
// EIO has been observed to be returned by the Linux kernel under some
// circumstances. Reading through drivers/tty/tty_io*.c, it seems to
// indicate the tty went away. Of course none of this is documented.
CHECK_IMPLIES(err == -1, errno == EIO);
CHECK_EQ(0, pthread_sigmask(SIG_UNBLOCK, &sa, nullptr));
CHECK_EQ(0, err);
}
}
#endif // __POSIX__
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