+ case '\n':
+ *(t++) = '\\';
+ *(t++) = 'n';
+ break;
+ case '\r':
+ *(t++) = '\\';
+ *(t++) = 'r';
+ break;
+ case '\t':
+ *(t++) = '\\';
+ *(t++) = 't';
+ break;
+ case '\v':
+ *(t++) = '\\';
+ *(t++) = 'v';
+ break;
+ case '\\':
+ *(t++) = '\\';
+ *(t++) = '\\';
+ break;
+ case '"':
+ *(t++) = '\\';
+ *(t++) = '"';
+ break;
+ case '\'':
+ *(t++) = '\\';
+ *(t++) = '\'';
+ break;
+
+ default:
+ /* For special chars we prefer octal over
+ * hexadecimal encoding, simply because glib's
+ * g_strescape() does the same */
+ if ((*f < ' ') || (*f >= 127)) {
+ *(t++) = '\\';
+ *(t++) = octchar((unsigned char) *f >> 6);
+ *(t++) = octchar((unsigned char) *f >> 3);
+ *(t++) = octchar((unsigned char) *f);
+ } else
+ *(t++) = *f;
+ break;
+ }
+
+ *t = 0;
+
+ return r;
+}
+
+char *cunescape_length(const char *s, size_t length) {
+ char *r, *t;
+ const char *f;
+
+ assert(s);
+
+ /* Undoes C style string escaping */
+
+ if (!(r = new(char, length+1)))
+ return r;
+
+ for (f = s, t = r; f < s + length; f++) {
+
+ if (*f != '\\') {
+ *(t++) = *f;
+ continue;
+ }
+
+ f++;
+
+ switch (*f) {
+
+ case 'a':
+ *(t++) = '\a';
+ break;
+ case 'b':
+ *(t++) = '\b';
+ break;
+ case 'f':
+ *(t++) = '\f';
+ break;
+ case 'n':
+ *(t++) = '\n';
+ break;
+ case 'r':
+ *(t++) = '\r';
+ break;
+ case 't':
+ *(t++) = '\t';
+ break;
+ case 'v':
+ *(t++) = '\v';
+ break;
+ case '\\':
+ *(t++) = '\\';
+ break;
+ case '"':
+ *(t++) = '"';
+ break;
+ case '\'':
+ *(t++) = '\'';
+ break;
+
+ case 's':
+ /* This is an extension of the XDG syntax files */
+ *(t++) = ' ';
+ break;
+
+ case 'x': {
+ /* hexadecimal encoding */
+ int a, b;
+
+ if ((a = unhexchar(f[1])) < 0 ||
+ (b = unhexchar(f[2])) < 0) {
+ /* Invalid escape code, let's take it literal then */
+ *(t++) = '\\';
+ *(t++) = 'x';
+ } else {
+ *(t++) = (char) ((a << 4) | b);
+ f += 2;
+ }
+
+ break;
+ }
+
+ case '0':
+ case '1':
+ case '2':
+ case '3':
+ case '4':
+ case '5':
+ case '6':
+ case '7': {
+ /* octal encoding */
+ int a, b, c;
+
+ if ((a = unoctchar(f[0])) < 0 ||
+ (b = unoctchar(f[1])) < 0 ||
+ (c = unoctchar(f[2])) < 0) {
+ /* Invalid escape code, let's take it literal then */
+ *(t++) = '\\';
+ *(t++) = f[0];
+ } else {
+ *(t++) = (char) ((a << 6) | (b << 3) | c);
+ f += 2;
+ }
+
+ break;
+ }
+
+ case 0:
+ /* premature end of string.*/
+ *(t++) = '\\';
+ goto finish;
+
+ default:
+ /* Invalid escape code, let's take it literal then */
+ *(t++) = '\\';
+ *(t++) = *f;
+ break;
+ }
+ }
+
+finish:
+ *t = 0;
+ return r;
+}
+
+char *cunescape(const char *s) {
+ return cunescape_length(s, strlen(s));
+}
+
+char *xescape(const char *s, const char *bad) {
+ char *r, *t;
+ const char *f;
+
+ /* Escapes all chars in bad, in addition to \ and all special
+ * chars, in \xFF style escaping. May be reversed with
+ * cunescape. */
+
+ if (!(r = new(char, strlen(s)*4+1)))
+ return NULL;
+
+ for (f = s, t = r; *f; f++) {
+
+ if ((*f < ' ') || (*f >= 127) ||
+ (*f == '\\') || strchr(bad, *f)) {
+ *(t++) = '\\';
+ *(t++) = 'x';
+ *(t++) = hexchar(*f >> 4);
+ *(t++) = hexchar(*f);
+ } else
+ *(t++) = *f;
+ }
+
+ *t = 0;
+
+ return r;
+}
+
+char *bus_path_escape(const char *s) {
+ char *r, *t;
+ const char *f;
+
+ assert(s);
+
+ /* Escapes all chars that D-Bus' object path cannot deal
+ * with. Can be reverse with bus_path_unescape() */
+
+ if (!(r = new(char, strlen(s)*3+1)))
+ return NULL;
+
+ for (f = s, t = r; *f; f++) {
+
+ if (!(*f >= 'A' && *f <= 'Z') &&
+ !(*f >= 'a' && *f <= 'z') &&
+ !(*f >= '0' && *f <= '9')) {
+ *(t++) = '_';
+ *(t++) = hexchar(*f >> 4);
+ *(t++) = hexchar(*f);
+ } else
+ *(t++) = *f;
+ }
+
+ *t = 0;
+
+ return r;
+}
+
+char *bus_path_unescape(const char *f) {
+ char *r, *t;
+
+ assert(f);
+
+ if (!(r = strdup(f)))
+ return NULL;
+
+ for (t = r; *f; f++) {
+
+ if (*f == '_') {
+ int a, b;
+
+ if ((a = unhexchar(f[1])) < 0 ||
+ (b = unhexchar(f[2])) < 0) {
+ /* Invalid escape code, let's take it literal then */
+ *(t++) = '_';
+ } else {
+ *(t++) = (char) ((a << 4) | b);
+ f += 2;
+ }
+ } else
+ *(t++) = *f;
+ }
+
+ *t = 0;
+
+ return r;
+}
+
+char *path_kill_slashes(char *path) {
+ char *f, *t;
+ bool slash = false;
+
+ /* Removes redundant inner and trailing slashes. Modifies the
+ * passed string in-place.
+ *
+ * ///foo///bar/ becomes /foo/bar
+ */
+
+ for (f = path, t = path; *f; f++) {
+
+ if (*f == '/') {
+ slash = true;
+ continue;
+ }
+
+ if (slash) {
+ slash = false;
+ *(t++) = '/';
+ }
+
+ *(t++) = *f;
+ }
+
+ /* Special rule, if we are talking of the root directory, a
+ trailing slash is good */
+
+ if (t == path && slash)
+ *(t++) = '/';
+
+ *t = 0;
+ return path;
+}
+
+bool path_startswith(const char *path, const char *prefix) {
+ assert(path);
+ assert(prefix);
+
+ if ((path[0] == '/') != (prefix[0] == '/'))
+ return false;
+
+ for (;;) {
+ size_t a, b;
+
+ path += strspn(path, "/");
+ prefix += strspn(prefix, "/");
+
+ if (*prefix == 0)
+ return true;
+
+ if (*path == 0)
+ return false;
+
+ a = strcspn(path, "/");
+ b = strcspn(prefix, "/");
+
+ if (a != b)
+ return false;
+
+ if (memcmp(path, prefix, a) != 0)
+ return false;
+
+ path += a;
+ prefix += b;
+ }
+}
+
+bool path_equal(const char *a, const char *b) {
+ assert(a);
+ assert(b);
+
+ if ((a[0] == '/') != (b[0] == '/'))
+ return false;
+
+ for (;;) {
+ size_t j, k;
+
+ a += strspn(a, "/");
+ b += strspn(b, "/");
+
+ if (*a == 0 && *b == 0)
+ return true;
+
+ if (*a == 0 || *b == 0)
+ return false;
+
+ j = strcspn(a, "/");
+ k = strcspn(b, "/");
+
+ if (j != k)
+ return false;
+
+ if (memcmp(a, b, j) != 0)
+ return false;
+
+ a += j;
+ b += k;
+ }
+}
+
+char *ascii_strlower(char *t) {
+ char *p;
+
+ assert(t);
+
+ for (p = t; *p; p++)
+ if (*p >= 'A' && *p <= 'Z')
+ *p = *p - 'A' + 'a';
+
+ return t;
+}
+
+bool ignore_file(const char *filename) {
+ assert(filename);
+
+ return
+ filename[0] == '.' ||
+ streq(filename, "lost+found") ||
+ streq(filename, "aquota.user") ||
+ streq(filename, "aquota.group") ||
+ endswith(filename, "~") ||
+ endswith(filename, ".rpmnew") ||
+ endswith(filename, ".rpmsave") ||
+ endswith(filename, ".rpmorig") ||
+ endswith(filename, ".dpkg-old") ||
+ endswith(filename, ".dpkg-new") ||
+ endswith(filename, ".swp");
+}
+
+int fd_nonblock(int fd, bool nonblock) {
+ int flags;
+
+ assert(fd >= 0);
+
+ if ((flags = fcntl(fd, F_GETFL, 0)) < 0)
+ return -errno;
+
+ if (nonblock)
+ flags |= O_NONBLOCK;
+ else
+ flags &= ~O_NONBLOCK;
+
+ if (fcntl(fd, F_SETFL, flags) < 0)
+ return -errno;
+
+ return 0;
+}
+
+int fd_cloexec(int fd, bool cloexec) {
+ int flags;
+
+ assert(fd >= 0);
+
+ if ((flags = fcntl(fd, F_GETFD, 0)) < 0)
+ return -errno;
+
+ if (cloexec)
+ flags |= FD_CLOEXEC;
+ else
+ flags &= ~FD_CLOEXEC;
+
+ if (fcntl(fd, F_SETFD, flags) < 0)
+ return -errno;
+
+ return 0;
+}
+
+int close_all_fds(const int except[], unsigned n_except) {
+ DIR *d;
+ struct dirent *de;
+ int r = 0;
+
+ if (!(d = opendir("/proc/self/fd")))
+ return -errno;
+
+ while ((de = readdir(d))) {
+ int fd = -1;
+
+ if (ignore_file(de->d_name))
+ continue;
+
+ if (safe_atoi(de->d_name, &fd) < 0)
+ /* Let's better ignore this, just in case */
+ continue;
+
+ if (fd < 3)
+ continue;
+
+ if (fd == dirfd(d))
+ continue;
+
+ if (except) {
+ bool found;
+ unsigned i;
+
+ found = false;
+ for (i = 0; i < n_except; i++)
+ if (except[i] == fd) {
+ found = true;
+ break;
+ }
+
+ if (found)
+ continue;
+ }
+
+ if (close_nointr(fd) < 0) {
+ /* Valgrind has its own FD and doesn't want to have it closed */
+ if (errno != EBADF && r == 0)
+ r = -errno;
+ }
+ }
+
+ closedir(d);
+ return r;
+}
+
+bool chars_intersect(const char *a, const char *b) {
+ const char *p;
+
+ /* Returns true if any of the chars in a are in b. */
+ for (p = a; *p; p++)
+ if (strchr(b, *p))
+ return true;
+
+ return false;
+}
+
+char *format_timestamp(char *buf, size_t l, usec_t t) {
+ struct tm tm;
+ time_t sec;
+
+ assert(buf);
+ assert(l > 0);
+
+ if (t <= 0)
+ return NULL;
+
+ sec = (time_t) (t / USEC_PER_SEC);
+
+ if (strftime(buf, l, "%a, %d %b %Y %H:%M:%S %z", localtime_r(&sec, &tm)) <= 0)
+ return NULL;
+
+ return buf;
+}
+
+char *format_timestamp_pretty(char *buf, size_t l, usec_t t) {
+ usec_t n, d;
+
+ n = now(CLOCK_REALTIME);
+
+ if (t <= 0 || t > n || t + USEC_PER_DAY*7 <= t)
+ return NULL;
+
+ d = n - t;
+
+ if (d >= USEC_PER_YEAR)
+ snprintf(buf, l, "%llu years and %llu months ago",
+ (unsigned long long) (d / USEC_PER_YEAR),
+ (unsigned long long) ((d % USEC_PER_YEAR) / USEC_PER_MONTH));
+ else if (d >= USEC_PER_MONTH)
+ snprintf(buf, l, "%llu months and %llu days ago",
+ (unsigned long long) (d / USEC_PER_MONTH),
+ (unsigned long long) ((d % USEC_PER_MONTH) / USEC_PER_DAY));
+ else if (d >= USEC_PER_WEEK)
+ snprintf(buf, l, "%llu weeks and %llu days ago",
+ (unsigned long long) (d / USEC_PER_WEEK),
+ (unsigned long long) ((d % USEC_PER_WEEK) / USEC_PER_DAY));
+ else if (d >= 2*USEC_PER_DAY)
+ snprintf(buf, l, "%llu days ago", (unsigned long long) (d / USEC_PER_DAY));
+ else if (d >= 25*USEC_PER_HOUR)
+ snprintf(buf, l, "1 day and %lluh ago",
+ (unsigned long long) ((d - USEC_PER_DAY) / USEC_PER_HOUR));
+ else if (d >= 6*USEC_PER_HOUR)
+ snprintf(buf, l, "%lluh ago",
+ (unsigned long long) (d / USEC_PER_HOUR));
+ else if (d >= USEC_PER_HOUR)
+ snprintf(buf, l, "%lluh %llumin ago",
+ (unsigned long long) (d / USEC_PER_HOUR),
+ (unsigned long long) ((d % USEC_PER_HOUR) / USEC_PER_MINUTE));
+ else if (d >= 5*USEC_PER_MINUTE)
+ snprintf(buf, l, "%llumin ago",
+ (unsigned long long) (d / USEC_PER_MINUTE));
+ else if (d >= USEC_PER_MINUTE)
+ snprintf(buf, l, "%llumin %llus ago",
+ (unsigned long long) (d / USEC_PER_MINUTE),
+ (unsigned long long) ((d % USEC_PER_MINUTE) / USEC_PER_SEC));
+ else if (d >= USEC_PER_SEC)
+ snprintf(buf, l, "%llus ago",
+ (unsigned long long) (d / USEC_PER_SEC));
+ else if (d >= USEC_PER_MSEC)
+ snprintf(buf, l, "%llums ago",
+ (unsigned long long) (d / USEC_PER_MSEC));
+ else if (d > 0)
+ snprintf(buf, l, "%lluus ago",
+ (unsigned long long) d);
+ else
+ snprintf(buf, l, "now");
+
+ buf[l-1] = 0;
+ return buf;
+}
+
+char *format_timespan(char *buf, size_t l, usec_t t) {
+ static const struct {
+ const char *suffix;
+ usec_t usec;
+ } table[] = {
+ { "w", USEC_PER_WEEK },
+ { "d", USEC_PER_DAY },
+ { "h", USEC_PER_HOUR },
+ { "min", USEC_PER_MINUTE },
+ { "s", USEC_PER_SEC },
+ { "ms", USEC_PER_MSEC },
+ { "us", 1 },
+ };
+
+ unsigned i;
+ char *p = buf;
+
+ assert(buf);
+ assert(l > 0);
+
+ if (t == (usec_t) -1)
+ return NULL;
+
+ if (t == 0) {
+ snprintf(p, l, "0");
+ p[l-1] = 0;
+ return p;
+ }
+
+ /* The result of this function can be parsed with parse_usec */
+
+ for (i = 0; i < ELEMENTSOF(table); i++) {
+ int k;
+ size_t n;
+
+ if (t < table[i].usec)
+ continue;
+
+ if (l <= 1)
+ break;
+
+ k = snprintf(p, l, "%s%llu%s", p > buf ? " " : "", (unsigned long long) (t / table[i].usec), table[i].suffix);
+ n = MIN((size_t) k, l);
+
+ l -= n;
+ p += n;
+
+ t %= table[i].usec;
+ }
+
+ *p = 0;
+
+ return buf;
+}
+
+bool fstype_is_network(const char *fstype) {
+ static const char * const table[] = {
+ "cifs",
+ "smbfs",
+ "ncpfs",
+ "nfs",
+ "nfs4",
+ "gfs",
+ "gfs2"
+ };
+
+ unsigned i;
+
+ for (i = 0; i < ELEMENTSOF(table); i++)
+ if (streq(table[i], fstype))
+ return true;
+
+ return false;
+}
+
+int chvt(int vt) {
+ int fd, r = 0;
+
+ if ((fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC)) < 0)
+ return -errno;
+
+ if (vt < 0) {
+ int tiocl[2] = {
+ TIOCL_GETKMSGREDIRECT,
+ 0
+ };
+
+ if (ioctl(fd, TIOCLINUX, tiocl) < 0)
+ return -errno;
+
+ vt = tiocl[0] <= 0 ? 1 : tiocl[0];
+ }
+
+ if (ioctl(fd, VT_ACTIVATE, vt) < 0)
+ r = -errno;
+
+ close_nointr_nofail(r);
+ return r;
+}
+
+int read_one_char(FILE *f, char *ret, bool *need_nl) {
+ struct termios old_termios, new_termios;
+ char c;
+ char line[LINE_MAX];
+
+ assert(f);
+ assert(ret);
+
+ if (tcgetattr(fileno(f), &old_termios) >= 0) {
+ new_termios = old_termios;
+
+ new_termios.c_lflag &= ~ICANON;
+ new_termios.c_cc[VMIN] = 1;
+ new_termios.c_cc[VTIME] = 0;
+
+ if (tcsetattr(fileno(f), TCSADRAIN, &new_termios) >= 0) {
+ size_t k;
+
+ k = fread(&c, 1, 1, f);
+
+ tcsetattr(fileno(f), TCSADRAIN, &old_termios);
+
+ if (k <= 0)
+ return -EIO;
+
+ if (need_nl)
+ *need_nl = c != '\n';
+
+ *ret = c;
+ return 0;
+ }
+ }
+
+ if (!(fgets(line, sizeof(line), f)))
+ return -EIO;
+
+ truncate_nl(line);
+
+ if (strlen(line) != 1)
+ return -EBADMSG;
+
+ if (need_nl)
+ *need_nl = false;
+
+ *ret = line[0];
+ return 0;
+}
+
+int ask(char *ret, const char *replies, const char *text, ...) {
+ bool on_tty;
+
+ assert(ret);
+ assert(replies);
+ assert(text);
+
+ on_tty = isatty(STDOUT_FILENO);
+
+ for (;;) {
+ va_list ap;
+ char c;
+ int r;
+ bool need_nl = true;
+
+ if (on_tty)
+ fputs("\x1B[1m", stdout);
+
+ va_start(ap, text);
+ vprintf(text, ap);
+ va_end(ap);
+
+ if (on_tty)
+ fputs("\x1B[0m", stdout);
+
+ fflush(stdout);
+
+ if ((r = read_one_char(stdin, &c, &need_nl)) < 0) {
+
+ if (r == -EBADMSG) {
+ puts("Bad input, please try again.");
+ continue;
+ }
+
+ putchar('\n');
+ return r;
+ }
+
+ if (need_nl)
+ putchar('\n');
+
+ if (strchr(replies, c)) {
+ *ret = c;
+ return 0;
+ }
+
+ puts("Read unexpected character, please try again.");
+ }
+}
+
+int reset_terminal_fd(int fd) {
+ struct termios termios;
+ int r = 0;
+ long arg;
+
+ /* Set terminal to some sane defaults */
+
+ assert(fd >= 0);
+
+ /* We leave locked terminal attributes untouched, so that
+ * Plymouth may set whatever it wants to set, and we don't
+ * interfere with that. */
+
+ /* Disable exclusive mode, just in case */
+ ioctl(fd, TIOCNXCL);
+
+ /* Enable console unicode mode */
+ arg = K_UNICODE;
+ ioctl(fd, KDSKBMODE, &arg);
+
+ if (tcgetattr(fd, &termios) < 0) {
+ r = -errno;
+ goto finish;
+ }
+
+ /* We only reset the stuff that matters to the software. How
+ * hardware is set up we don't touch assuming that somebody
+ * else will do that for us */
+
+ termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC);
+ termios.c_iflag |= ICRNL | IMAXBEL | IUTF8;
+ termios.c_oflag |= ONLCR;
+ termios.c_cflag |= CREAD;
+ termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE;
+
+ termios.c_cc[VINTR] = 03; /* ^C */
+ termios.c_cc[VQUIT] = 034; /* ^\ */
+ termios.c_cc[VERASE] = 0177;
+ termios.c_cc[VKILL] = 025; /* ^X */
+ termios.c_cc[VEOF] = 04; /* ^D */
+ termios.c_cc[VSTART] = 021; /* ^Q */
+ termios.c_cc[VSTOP] = 023; /* ^S */
+ termios.c_cc[VSUSP] = 032; /* ^Z */
+ termios.c_cc[VLNEXT] = 026; /* ^V */
+ termios.c_cc[VWERASE] = 027; /* ^W */
+ termios.c_cc[VREPRINT] = 022; /* ^R */
+ termios.c_cc[VEOL] = 0;
+ termios.c_cc[VEOL2] = 0;
+
+ termios.c_cc[VTIME] = 0;
+ termios.c_cc[VMIN] = 1;
+
+ if (tcsetattr(fd, TCSANOW, &termios) < 0)
+ r = -errno;
+
+finish:
+ /* Just in case, flush all crap out */
+ tcflush(fd, TCIOFLUSH);
+
+ return r;
+}
+
+int reset_terminal(const char *name) {
+ int fd, r;
+
+ fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
+ if (fd < 0)
+ return fd;
+
+ r = reset_terminal_fd(fd);
+ close_nointr_nofail(fd);
+
+ return r;
+}
+
+int open_terminal(const char *name, int mode) {
+ int fd, r;
+ unsigned c = 0;
+
+ /*
+ * If a TTY is in the process of being closed opening it might
+ * cause EIO. This is horribly awful, but unlikely to be
+ * changed in the kernel. Hence we work around this problem by
+ * retrying a couple of times.
+ *
+ * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245
+ */
+
+ for (;;) {
+ if ((fd = open(name, mode)) >= 0)
+ break;
+
+ if (errno != EIO)
+ return -errno;
+
+ if (c >= 20)
+ return -errno;
+
+ usleep(50 * USEC_PER_MSEC);
+ c++;
+ }
+
+ if (fd < 0)
+ return -errno;
+
+ if ((r = isatty(fd)) < 0) {
+ close_nointr_nofail(fd);
+ return -errno;
+ }
+
+ if (!r) {
+ close_nointr_nofail(fd);
+ return -ENOTTY;
+ }
+
+ return fd;
+}
+
+int flush_fd(int fd) {
+ struct pollfd pollfd;
+
+ zero(pollfd);
+ pollfd.fd = fd;
+ pollfd.events = POLLIN;
+
+ for (;;) {
+ char buf[LINE_MAX];
+ ssize_t l;
+ int r;
+
+ if ((r = poll(&pollfd, 1, 0)) < 0) {
+
+ if (errno == EINTR)
+ continue;
+
+ return -errno;
+ }
+
+ if (r == 0)
+ return 0;
+
+ if ((l = read(fd, buf, sizeof(buf))) < 0) {
+
+ if (errno == EINTR)
+ continue;
+
+ if (errno == EAGAIN)
+ return 0;
+
+ return -errno;
+ }
+
+ if (l <= 0)
+ return 0;
+ }
+}
+
+int acquire_terminal(const char *name, bool fail, bool force, bool ignore_tiocstty_eperm) {
+ int fd = -1, notify = -1, r, wd = -1;
+
+ assert(name);
+
+ /* We use inotify to be notified when the tty is closed. We
+ * create the watch before checking if we can actually acquire
+ * it, so that we don't lose any event.
+ *
+ * Note: strictly speaking this actually watches for the
+ * device being closed, it does *not* really watch whether a
+ * tty loses its controlling process. However, unless some
+ * rogue process uses TIOCNOTTY on /dev/tty *after* closing
+ * its tty otherwise this will not become a problem. As long
+ * as the administrator makes sure not configure any service
+ * on the same tty as an untrusted user this should not be a
+ * problem. (Which he probably should not do anyway.) */
+
+ if (!fail && !force) {
+ if ((notify = inotify_init1(IN_CLOEXEC)) < 0) {
+ r = -errno;
+ goto fail;
+ }
+
+ if ((wd = inotify_add_watch(notify, name, IN_CLOSE)) < 0) {
+ r = -errno;
+ goto fail;
+ }
+ }
+
+ for (;;) {
+ if (notify >= 0)
+ if ((r = flush_fd(notify)) < 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)
+ return fd;
+
+ /* First, try to get the tty */
+ r = ioctl(fd, TIOCSCTTY, force);
+
+ /* 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)
+ r = 0;
+
+ if (r < 0 && (force || fail || errno != EPERM)) {
+ r = -errno;
+ goto fail;
+ }
+
+ if (r >= 0)