Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
+ Lesser General Public License for more details.
- You should have received a copy of the GNU General Public License
+ You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <glob.h>
#include <grp.h>
#include <sys/mman.h>
+#include <sys/statvfs.h>
#include "macro.h"
#include "util.h"
/* Does C style string escaping. */
- if (!(r = new(char, strlen(s)*4 + 1)))
+ r = new(char, strlen(s)*4 + 1);
+ if (!r)
return NULL;
for (f = s, t = r; *f; f++)
return vtnr_from_tty(tty) >= 0;
}
+bool tty_is_console(const char *tty) {
+ assert(tty);
+
+ if (startswith(tty, "/dev/"))
+ tty += 5;
+
+ return streq(tty, "console");
+}
+
int vtnr_from_tty(const char *tty) {
int i, r;
if (startswith(tty, "/dev/"))
tty += 5;
- /* Resolve where /dev/console is pointing to */
- if (streq(tty, "console"))
+ /* Resolve where /dev/console is pointing to, if /sys is
+ * actually ours (i.e. not read-only-mounted which is a sign
+ * for container setups) */
+ if (streq(tty, "console") && path_is_read_only_fs("/sys") <= 0)
if (read_one_line_file("/sys/class/tty/console/active", &active) >= 0) {
/* If multiple log outputs are configured the
* last one is what /dev/console points to */
return 1;
}
+
+int fork_agent(pid_t *pid, const int except[], unsigned n_except, const char *path, ...) {
+ pid_t parent_pid, agent_pid;
+ int fd;
+ bool stdout_is_tty, stderr_is_tty;
+ unsigned n, i;
+ va_list ap;
+ char **l;
+
+ assert(pid);
+ assert(path);
+
+ parent_pid = getpid();
+
+ /* Spawns a temporary TTY agent, making sure it goes away when
+ * we go away */
+
+ agent_pid = fork();
+ if (agent_pid < 0)
+ return -errno;
+
+ if (agent_pid != 0) {
+ *pid = agent_pid;
+ return 0;
+ }
+
+ /* In the child:
+ *
+ * Make sure the agent goes away when the parent dies */
+ if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0)
+ _exit(EXIT_FAILURE);
+
+ /* Check whether our parent died before we were able
+ * to set the death signal */
+ if (getppid() != parent_pid)
+ _exit(EXIT_SUCCESS);
+
+ /* Don't leak fds to the agent */
+ close_all_fds(except, n_except);
+
+ stdout_is_tty = isatty(STDOUT_FILENO);
+ stderr_is_tty = isatty(STDERR_FILENO);
+
+ if (!stdout_is_tty || !stderr_is_tty) {
+ /* Detach from stdout/stderr. and reopen
+ * /dev/tty for them. This is important to
+ * ensure that when systemctl is started via
+ * popen() or a similar call that expects to
+ * read EOF we actually do generate EOF and
+ * not delay this indefinitely by because we
+ * keep an unused copy of stdin around. */
+ fd = open("/dev/tty", O_WRONLY);
+ if (fd < 0) {
+ log_error("Failed to open /dev/tty: %m");
+ _exit(EXIT_FAILURE);
+ }
+
+ if (!stdout_is_tty)
+ dup2(fd, STDOUT_FILENO);
+
+ if (!stderr_is_tty)
+ dup2(fd, STDERR_FILENO);
+
+ if (fd > 2)
+ close(fd);
+ }
+
+ /* Count arguments */
+ va_start(ap, path);
+ for (n = 0; va_arg(ap, char*); n++)
+ ;
+ va_end(ap);
+
+ /* Allocate strv */
+ l = alloca(sizeof(char *) * (n + 1));
+
+ /* Fill in arguments */
+ va_start(ap, path);
+ for (i = 0; i <= n; i++)
+ l[i] = va_arg(ap, char*);
+ va_end(ap);
+
+ execv(path, l);
+ _exit(EXIT_FAILURE);
+}
+
+int setrlimit_closest(int resource, const struct rlimit *rlim) {
+ struct rlimit highest, fixed;
+
+ assert(rlim);
+
+ if (setrlimit(resource, rlim) >= 0)
+ return 0;
+
+ if (errno != EPERM)
+ return -errno;
+
+ /* So we failed to set the desired setrlimit, then let's try
+ * to get as close as we can */
+ assert_se(getrlimit(resource, &highest) == 0);
+
+ fixed.rlim_cur = MIN(rlim->rlim_cur, highest.rlim_max);
+ fixed.rlim_max = MIN(rlim->rlim_max, highest.rlim_max);
+
+ if (setrlimit(resource, &fixed) < 0)
+ return -errno;
+
+ return 0;
+}
+
+int path_is_read_only_fs(const char *path) {
+ struct statvfs st;
+
+ assert(path);
+
+ if (statvfs(path, &st) < 0)
+ return -errno;
+
+ return !!(st.f_flag & ST_RDONLY);
+}
~ianmdlvl / elogind.git / blobdiff