G. Pape
runit
chpst - runs a program with a changed process state
chpst [-vP012]
[-u user] [-U user] [-e dir] [-/ root] [-n inc] [-l|-L lock] [-m bytes] [-d bytes]
[-o n] [-p n] [-f bytes] [-c bytes] prog
prog consists of one or
more arguments.
chpst changes the process state according to the given options,
and runs prog.
- -u user[:group]
- setuidgid. Set uid and gid to the user’s
uid and gid. If user is followed by a colon and a group, set the gid to
group’s gid instead of user’s gid. If group consists of a colon-separated list
of group names, chpst sets the group ids of all listed groups. All initial
supplementary groups are removed.
- -U user[:group]
- envuidgid. Set the environment
variables $UID and $GID to the user’s uid and gid. If user is followed by
a colon and a group, set $GID to the group’s gid instead of user’s gid.
- -e
dir
- envdir. Set various environment variables as specified by files in the
directory dir: If dir contains a file named k whose first line is v, chpst
removes the environment variable k if it exists, and then adds the environment
variable k with the value v. The name k must not contain =. Spaces and tabs
at the end of v are removed, and nulls in v are changed to newlines. If
the file k is empty (0 bytes long), chpst removes the environment variable
k if it exists, without adding a new variable.
- -/ root
- chroot. Change the
root directory to root before starting prog.
- -n inc
- nice. Add inc to the nice(2)
value before starting prog. inc must be an integer, and may start with a
minus or plus.
- -l lock
- lock. Open the file lock for writing, and obtain an
exclusive lock on it. lock will be created if it does not exist. If lock
is locked by another process, wait until a new lock can be obtained.
- -L lock
- The same as -l, but fail immediately if lock is locked by another process.
- -m bytes
- limit memory. Limit the data segment, stack segment, locked physical
pages, and total of all segment per process to bytes bytes each.
- -d bytes
- limit data segment. Limit the data segment per process to bytes bytes.
- -o
n
- limit open files. Limit the number of open file descriptors per process
to n.
- -p n
- limit processes. Limit the number of processes per uid to n.
- -f bytes
- limit output size. Limit the output file size to bytes bytes.
- -c bytes
- limit
core size. Limit the core file size to bytes bytes.
- -v
- verbose. Print verbose
messages to standard error. This includes warnings about limits unsupported
by the system.
- -P
- pgrphack. Run prog in a new process group.
- -0
- Close standard
input before starting prog.
- -1
- Close standard output before starting prog.
- -2
- Close standard error before starting prog.
chpst exits 100 when
called with wrong options. It prints an error message and exits 111 if it
has trouble changing the process state. Otherwise its exit code is the same
as that of prog.
If chpst is called as envdir, envuidgid, pgrphack,
setlock, setuidgid, or softlimit, it emulates the functionality of these
programs from the daemontools package respectively.
sv(8), runsv(8),
setsid(2), runit(8), runit-init(8), runsvdir(8), runsvchdir(8)
http://smarden.org/runit/
http://cr.yp.to/daemontools.html
Gerrit Pape <pape@smarden.org>
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