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prlimit: add support for executing a command 

prlimit.c: Alternatively to applying the limits to an existing process via the
--pid option, allow a command to be executed. Adapted usage() accordingly.

prlimit.1: mention new syntax.

Signed-off-by: Bernhard Voelker <mail@bernhard-voelker.de>
This commit is contained in:
Bernhard Voelker 2011-11-16 17:57:27 +01:00 committed by Karel Zak
parent 0459a7b389
commit 53e1f461f9
2 changed files with 26 additions and 5 deletions
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14
sys-utils/prlimit.1
View File

@ -9,12 +9,22 @@ get and set a process resource limits.
.SH SYNOPSIS
.B prlimit
.RB [options]
.RB [ \-\-{resource_name}[=limits] ]
.RB [ \-\-{resource_name}[=limits]
.RB [ \-\-pid\ PID]
.B prlimit
.RB [options]
.RB [ \-\-{resource_name}[=limits]]
.RB "command " [ argument ...]
.SH DESCRIPTION
Given a process id and one or more resources, \fBprlimit\fP tries to retrieve
and/or modify the limits.
When \fIcommand\fR is given,
.B prlimit
will run this command with the given arguments.
The \fIlimits\fP format is composed by a soft and a hard (ceiling) value, separated
by a semicolon (:), in order to modify the existing value(s). If no limits are
used, \fBprlimit\fP will only display the current values. If one of the values
@ -92,6 +102,8 @@ of open files to 1024 and 4095, respectively.
Modify only the soft limit for the amount of processes.
.IP "\fBprlimit \-\-pid $$ --nproc=unlimited\fP"
Set the amount of processes for both soft and ceiling values to unlimited.
.IP "\fBprlimit --cpu=10 sort -u hugefile\fP"
Set the soft and hard CPU time limit and run 'sort'.
.SH "SEE ALSO"
.BR prlimit (2),

17
sys-utils/prlimit.c
View File

@ -152,7 +152,9 @@ static void __attribute__ ((__noreturn__)) usage(FILE * out)
fputs(USAGE_HEADER, out);
fprintf(out,
_(" %s [options]\n"), program_invocation_short_name);
_(" %s [options] [-p PID]\n"), program_invocation_short_name);
fprintf(out,
_(" %s [options] COMMAND\n"), program_invocation_short_name);
fputs(_("\nGeneral Options:\n"), out);
fputs(_(" -p, --pid <pid> process id\n"
@ -521,7 +523,7 @@ int main(int argc, char **argv)
assert(MAX_RESOURCES == STACK + 1);
while((opt = getopt_long(argc, argv,
"c::d::e::f::i::l::m::n::q::r::s::t::u::v::x::y::p:o:vVh",
"+c::d::e::f::i::l::m::n::q::r::s::t::u::v::x::y::p:o:vVh",
longopts, NULL)) != -1) {
switch(opt) {
case 'c':
@ -608,8 +610,9 @@ int main(int argc, char **argv)
break;
}
}
if (argc > optind)
usage(stderr);
if (argc > optind && pid)
errx(EXIT_FAILURE,
_("--pid option and COMMAND are mutually exclusive"));
if (!ncolumns) {
/* default columns */
@ -633,5 +636,11 @@ int main(int argc, char **argv)
if (!list_empty(&lims))
show_limits(&lims, tt_flags);
if (argc > optind) {
/* prlimit [options] COMMAND */
execvp(argv[optind], &argv[optind]);
err(EXIT_FAILURE, _("executing %s failed"), argv[optind]);
}
return EXIT_SUCCESS;
}