#include <config.h>
#include "daemon.h"
+#include "daemon-private.h"
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
VLOG_DEFINE_THIS_MODULE(daemon_unix);
/* --detach: Should we run in the background? */
-static bool detach; /* Was --detach specified? */
+bool detach; /* Was --detach specified? */
static bool detached; /* Have we already detached? */
/* --pidfile: Name of pidfile (null if none). */
-static char *pidfile;
+char *pidfile;
/* Device and inode of pidfile, so we can avoid reopening it. */
static dev_t pidfile_dev;
* it dies due to an error signal? */
static bool monitor;
-/* For each of the standard file descriptors, whether to replace it by
- * /dev/null (if false) or keep it for the daemon to use (if true). */
-static bool save_fds[3];
-
static void check_already_running(void);
static int lock_pidfile(FILE *, int command);
-static char *make_pidfile_name(const char *name);
static pid_t fork_and_clean_up(void);
static void daemonize_post_detach(void);
/* Returns the file name that would be used for a pidfile if 'name' were
* provided to set_pidfile(). The caller must free the returned string. */
-static char *
+char *
make_pidfile_name(const char *name)
{
return (!name
: abs_file_name(ovs_rundir(), name));
}
-/* Sets up a following call to daemonize() to create a pidfile named 'name'.
- * If 'name' begins with '/', then it is treated as an absolute path.
- * Otherwise, it is taken relative to RUNDIR, which is $(prefix)/var/run by
- * default.
- *
- * If 'name' is null, then program_name followed by ".pid" is used. */
-void
-set_pidfile(const char *name)
-{
- assert_single_threaded();
- free(pidfile);
- pidfile = make_pidfile_name(name);
-}
-
/* Sets that we do not chdir to "/". */
void
set_no_chdir(void)
detach = true;
}
-/* Will daemonize() really detach? */
-bool
-get_detach(void)
-{
- return detach;
-}
-
/* Sets up a following call to daemonize() to fork a supervisory process to
* monitor the daemon and restart it if it dies due to an error signal. */
void
monitor = true;
}
-/* A daemon doesn't normally have any use for the file descriptors for stdin,
- * stdout, and stderr after it detaches. To keep these file descriptors from
- * e.g. holding an SSH session open, by default detaching replaces each of
- * these file descriptors by /dev/null. But a few daemons expect the user to
- * redirect stdout or stderr to a file, in which case it is desirable to keep
- * these file descriptors. This function, therefore, disables replacing 'fd'
- * by /dev/null when the daemon detaches. */
-void
-daemon_save_fd(int fd)
-{
- ovs_assert(fd == STDIN_FILENO ||
- fd == STDOUT_FILENO ||
- fd == STDERR_FILENO);
- save_fds[fd] = true;
-}
-
/* If a pidfile has been configured, creates it and stores the running
* process's pid in it. Ensures that the pidfile will be deleted when the
* process exits. */
free(tmpfile);
}
-/* If configured with set_pidfile() or set_detach(), creates the pid file and
- * detaches from the foreground session. */
-void
-daemonize(void)
-{
- daemonize_start();
- daemonize_complete();
-}
-
/* Calls fork() and on success returns its return value. On failure, logs an
* error and exits unsuccessfully.
*
set_subprogram_name("");
}
-/* Returns a readable and writable fd for /dev/null, if successful, otherwise
- * a negative errno value. The caller must not close the returned fd (because
- * the same fd will be handed out to subsequent callers). */
-static int
-get_null_fd(void)
-{
- static int null_fd;
-
- if (!null_fd) {
- null_fd = open("/dev/null", O_RDWR);
- if (null_fd < 0) {
- int error = errno;
- VLOG_ERR("could not open /dev/null: %s", ovs_strerror(error));
- null_fd = -error;
- }
- }
-
- return null_fd;
-}
-
-/* Close standard file descriptors (except any that the client has requested we
- * leave open by calling daemon_save_fd()). If we're started from e.g. an SSH
- * session, then this keeps us from holding that session open artificially. */
-static void
-close_standard_fds(void)
-{
- int null_fd = get_null_fd();
- if (null_fd >= 0) {
- int fd;
-
- for (fd = 0; fd < 3; fd++) {
- if (!save_fds[fd]) {
- dup2(null_fd, fd);
- }
- }
- }
-
- /* Disable logging to stderr to avoid wasting CPU time. */
- vlog_set_levels(NULL, VLF_CONSOLE, VLL_OFF);
-}
-
/* If daemonization is configured, then starts daemonization, by forking and
* returning in the child process. The parent process hangs around until the
* child lets it know either that it completed startup successfully (by calling
git://git.onelab.eu / sliver-openvswitch.git / blobdiff