diff options
Diffstat (limited to 'src/shared/util.c')
| -rw-r--r-- | src/shared/util.c | 58 |
1 files changed, 48 insertions, 10 deletions
diff --git a/src/shared/util.c b/src/shared/util.c index 67ec5ae747..041a63bb4b 100644 --- a/src/shared/util.c +++ b/src/shared/util.c @@ -2305,12 +2305,14 @@ int open_terminal(const char *name, int mode) { */ for (;;) { - if ((fd = open(name, mode)) >= 0) + fd = open(name, mode); + if (fd >= 0) break; if (errno != EIO) return -errno; + /* Max 1s in total */ if (c >= 20) return -errno; @@ -2321,7 +2323,8 @@ int open_terminal(const char *name, int mode) { if (fd < 0) return -errno; - if ((r = isatty(fd)) < 0) { + r = isatty(fd); + if (r < 0) { close_nointr_nofail(fd); return -errno; } @@ -2373,8 +2376,15 @@ int flush_fd(int fd) { } } -int acquire_terminal(const char *name, bool fail, bool force, bool ignore_tiocstty_eperm) { +int acquire_terminal( + const char *name, + bool fail, + bool force, + bool ignore_tiocstty_eperm, + usec_t timeout) { + int fd = -1, notify = -1, r, wd = -1; + usec_t ts = 0; assert(name); @@ -2391,27 +2401,35 @@ int acquire_terminal(const char *name, bool fail, bool force, bool ignore_tiocst * on the same tty as an untrusted user this should not be a * problem. (Which he probably should not do anyway.) */ + if (timeout != (usec_t) -1) + ts = now(CLOCK_MONOTONIC); + if (!fail && !force) { - if ((notify = inotify_init1(IN_CLOEXEC)) < 0) { + notify = inotify_init1(IN_CLOEXEC | (timeout != (usec_t) -1 ? IN_NONBLOCK : 0)); + if (notify < 0) { r = -errno; goto fail; } - if ((wd = inotify_add_watch(notify, name, IN_CLOSE)) < 0) { + wd = inotify_add_watch(notify, name, IN_CLOSE); + if (wd < 0) { r = -errno; goto fail; } } for (;;) { - if (notify >= 0) - if ((r = flush_fd(notify)) < 0) + if (notify >= 0) { + r = flush_fd(notify); + if (r < 0) goto fail; + } /* We pass here O_NOCTTY only so that we can check the return * value TIOCSCTTY and have a reliable way to figure out if we * successfully became the controlling process of the tty */ - if ((fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC)) < 0) + fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); + if (fd < 0) return fd; /* First, try to get the tty */ @@ -2440,9 +2458,29 @@ int acquire_terminal(const char *name, bool fail, bool force, bool ignore_tiocst ssize_t l; struct inotify_event *e; - if ((l = read(notify, inotify_buffer, sizeof(inotify_buffer))) < 0) { + if (timeout != (usec_t) -1) { + usec_t n; + + n = now(CLOCK_MONOTONIC); + if (ts + timeout < n) { + r = -ETIMEDOUT; + goto fail; + } + + r = fd_wait_for_event(fd, POLLIN, ts + timeout - n); + if (r < 0) + goto fail; + + if (r == 0) { + r = -ETIMEDOUT; + goto fail; + } + } + + l = read(notify, inotify_buffer, sizeof(inotify_buffer)); + if (l < 0) { - if (errno == EINTR) + if (errno == EINTR || errno == EAGAIN) continue; r = -errno; |