【Linux】start-stop-daemon 秒速五厘米 2023-03-13 02:20 19阅读 0赞 start-stop-daemon BusyBox v1.26.2 (2018-08-02 17:42:03 CST) multi-call binary. Usage: start-stop-daemon [OPTIONS] [-S|-K] ... [-- ARGS...] Search for matching processes, and then -K: stop all matching processes. -S: start a process unless a matching process is found. Process matching: -u,--user USERNAME|UID Match only this user's processes -n,--name NAME Match processes with NAME in comm field in /proc/PID/stat -x,--exec EXECUTABLE Match processes with this command in /proc/PID/{exe,cmdline} -p,--pidfile FILE Match a process with PID from the file All specified conditions must match -S only: -x,--exec EXECUTABLE Program to run -a,--startas NAME Zeroth argument -b,--background Background -N,--nicelevel N Change nice level -c,--chuid USER[:[GRP]] Change to user/group -m,--make-pidfile Write PID to the pidfile specified by -p -K only: -s,--signal SIG Signal to send -t,--test Match only, exit with 0 if a process is found Other: -o,--oknodo Exit with status 0 if nothing is done -v,--verbose Verbose -q,--quiet Quiet chad@ape:/$ start-stop-daemon --help Usage: start-stop-daemon [<option>...] <command> Commands: -S, --start -- <argument>... start a program and pass <arguments> to it -K, --stop stop a program -T, --status get the program status -H, --help print help information -V, --version print version Matching options (at least one is required): --pid <pid> pid to check --ppid <ppid> parent pid to check -p, --pidfile <pid-file> pid file to check -x, --exec <executable> program to start/check if it is running -n, --name <process-name> process name to check -u, --user <username|uid> process owner to check Options: -g, --group <group|gid> run process as this group -c, --chuid <name|uid[:group|gid]> change to this user/group before starting process -s, --signal <signal> signal to send (default TERM) -a, --startas <pathname> program to start (default is <executable>) -r, --chroot <directory> chroot to <directory> before starting -d, --chdir <directory> change to <directory> (default is /) -N, --nicelevel <incr> add incr to the process' nice level -P, --procsched <policy[:prio]> use <policy> with <prio> for the kernel process scheduler (default prio is 0) -I, --iosched <class[:prio]> use <class> with <prio> to set the IO scheduler (default prio is 4) -k, --umask <mask> change the umask to <mask> before starting -b, --background force the process to detach --notify-await wait for a readiness notification --notify-timeout <int> timeout after <int> seconds of notify wait -C, --no-close do not close any file descriptor -m, --make-pidfile create the pidfile before starting --remove-pidfile delete the pidfile after stopping -R, --retry <schedule> check whether processes die, and retry -t, --test test mode, don't do anything -o, --oknodo exit status 0 (not 1) if nothing done -q, --quiet be more quiet -v, --verbose be more verbose Retry <schedule> is <item>|/<item>/... where <item> is one of -<signal-num>|[-]<signal-name> send that signal <timeout> wait that many seconds forever repeat remainder forever or <schedule> may be just <timeout>, meaning <signal>/<timeout>/KILL/<timeout> The process scheduler <policy> can be one of: other, fifo or rr The IO scheduler <class> can be one of: real-time, best-effort or idle Exit status: 0 = done 1 = nothing done (=> 0 if --oknodo) 2 = with --retry, processes would not die 3 = trouble Exit status with --status: 0 = program is running 1 = program is not running and the pid file exists 3 = program is not running 4 = unable to determine status NAME **start-stop-daemon** \- start and stop system daemon programs SYNOPSIS start-stop-daemon \[option...\] command DESCRIPTION start-stop-daemon is used to control the creation and termination of system-level processes. Using one of the matching options, start-stop-daemon can be configured to find existing instances of a running process. Note: unless --pid or --pidfile are specified, start-stop-daemon behaves similar to killall(1). start-stop-daemon will scan the process table looking for any processes which match the process name, parent pid, uid, and/or gid (if specified). Any matching process will prevent --start from starting the daemon. All matching processes will be sent the TERM signal (or the one specified via --signal or --retry) if --stop is specified. For daemons which have long-lived children which need to live through a --stop, you must specify a pidfile. COMMANDS ** -S, --start \[--\] arguments** **Check for the existence of a specified process**. If such a process exists, start-stop-daemon does nothing, and exits with error status 1 (0 if --oknodo is specified). If such a process does not exist, it starts an instance, using either the executable specified by --exec or, if specified, by --startas. Any arguments given after -- on the command line are passed unmodified to the program being started. -K, --stop Checks for the existence of a specified process. If such a process exists, start-stop-daemon sends it the signal specified by --signal, and exits with error status 0. If such a process does not exist, start-stop-daemon exits with error status 1 (0 if --oknodo is specified). If --retry is specified, then start-stop-daemon will check that the process(es) have terminated. -T, --status Check for the existence of a specified process, and returns an exit status code, according to the LSB Init Script Actions (since version 1.16.1). -H, --help Show usage information and exit. -V, --version Show the program version and exit. OPTIONS Matching options --pid pid Check for a process with the specified pid (since version 1.17.6). The pid must be a number greater than 0. --ppid ppid Check for a process with the specified parent pid ppid (since version 1.17.7). The ppid must be a number greater than 0. ** -p, --pidfile pid-file** Check whether a process has created the file pid-file. Note: using this matching option alone might cause unintended processes to be acted on, if the old process terminated without being able to remove the pid-file. ** -x, --exec executable** **Check for processes that are instances of this executable. The executable argument should be an absolute pathname. Note: this might not work as intended with interpreted scripts, as the executable will point to the interpreter. Take into account processes running from inside a chroot will also be matched, so other match restrictions might be needed.** -n, --name process-name Check for processes with the name process-name. The process-name is usually the process filename, but it could have been changed by the process itself. Note: on most systems this information is retrieved from the process comm name from the kernel, which tends to have a relatively short length limit (assuming more than 15 characters is non-portable). -u, --user username|uid Check for processes owned by the user specified by username or uid. Note: using this matching option alone will cause all processes matching the user to be acted on. Generic options -g, --group group|gid Change to group or gid when starting the process. -s, --signal signal With --stop, specifies the signal to send to processes being stopped (default TERM). **-b, --background** Typically used with programs that don't detach on their own. This option will force start-stop-daemon to fork before starting the process, and force it into the background. Warning: start-stop-daemon cannot check the exit status if the process fails to execute for any reason. This is a last resort, and is only meant for programs that either make no sense forking on their own, or where it's not feasible to add the code for them to do this themselves. -C, --no-close Do not close any file descriptor when forcing the daemon into the background (since version 1.16.5). Used for debugging purposes to see the process output, or to redirect file descriptors to log the process output. Only relevant when using --background. -N, --nicelevel int This alters the priority of the process before starting it. -P, --procsched policy:priority This alters the process scheduler policy and priority of the process before starting it (since version 1.15.0). The priority can be optionally specified by appending a : followed by the value. The default priority is 0. The currently supported policy values are other, fifo and rr. -I, --iosched class:priority This alters the IO scheduler class and priority of the process before starting it (since version 1.15.0). The priority can be optionally specified by appending a : followed by the value. The default priority is 4, unless class is idle, then priority will always be 7. The currently supported values for class are idle, best- effort and real-time. -k, --umask mask This sets the umask of the process before starting it (since version 1.13.22). **-m, --make-pidfile** Used when starting a program that does not create its own pid file. This option will make start-stop-daemon create the file referenced with --pidfile and place the pid into it just before executing the process. Note, the file will only be removed when stopping the program if --remove-pidfile is used. Note: This feature may not work in all cases. Most notably when the program being executed forks from its main process. Because of this, it is usually only useful when combined with the --background option.
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