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util: temporarily ignore SIGHUP while we are issuing TIOCSTTY

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This commit is contained in:
Lennart Poettering 2012-07-13 13:55:35 +02:00
parent 95ea1b90cc
commit 32c4bef882
1 changed files with 14 additions and 4 deletions
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18
src/shared/util.c
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@ -2387,6 +2387,7 @@ int acquire_terminal(
int fd = -1, notify = -1, r, wd = -1;
usec_t ts = 0;
struct sigaction sa_old, sa_new;
assert(name);
@ -2434,17 +2435,26 @@ int acquire_terminal(
if (fd < 0)
return fd;
/* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed
* if we already own the tty. */
zero(sa_new);
sa_new.sa_handler = SIG_IGN;
sa_new.sa_flags = SA_RESTART;
assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0);
/* First, try to get the tty */
r = ioctl(fd, TIOCSCTTY, force);
if (ioctl(fd, TIOCSCTTY, force) < 0)
r = -errno;
assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
/* Sometimes it makes sense to ignore TIOCSCTTY
* returning EPERM, i.e. when very likely we already
* are have this controlling terminal. */
if (r < 0 && errno == EPERM && ignore_tiocstty_eperm)
if (r < 0 && r == -EPERM && ignore_tiocstty_eperm)
r = 0;
if (r < 0 && (force || fail || errno != EPERM)) {
r = -errno;
if (r < 0 && (force || fail || r != -EPERM)) {
goto fail;
}