chpst - runs a program with a changed process state
chpst [-vP012] [-u user] [-U user] [-b argv0] [-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.
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)
- -u [:]user[:group]
- setuidgid. Set uid and gid to the user's uid and gid, as found in
/etc/passwd. If user is followed by a colon and a
group, set the gid to group's gid, as found in
/etc/group, 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. If user is prefixed with a colon, the
user and all group arguments are interpreted as uid and gids
respectivly, and not looked up in the password or group file. All initial
supplementary groups are removed.
- -U [:]user[:group]
- envuidgid. Set the environment variables $UID and $GID to the
user's uid and gid, as found in /etc/passwd. If user
is followed by a colon and a group, set $GID to the group's
gid, as found in /etc/group, instead of user's gid. If
user is prefixed with a colon, the user and group
arguments are interpreted as uid and gid respectivly, and not looked up in
the password or group file.
- -b argv0
- argv0. Run prog with argv0 as the 0th argument.
- -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
- -/ root
- chroot. Change the root directory to root before starting
- -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
- -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
- -m bytes
- limit memory. Limit the data segment, stack segment, locked physical
pages, and total of all segment per process to bytes bytes
- -d bytes
- limit data segment. Limit the data segment per process to bytes
- -o n
- limit open files. Limit the number of open file descriptors per process to
- -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.
- verbose. Print verbose messages to standard error. This includes warnings
about limits unsupported by the system.
- pgrphack. Run prog in a new process group.
- Close standard input before starting prog.
- Close standard output before starting prog.
- Close standard error before starting prog.
Gerrit Pape <email@example.com>