As previously dicussed [1] here comes the patch for executing a command
(alternatively to setting limits for a running process via --pid).
[1] http://article.gmane.org/gmane.linux.utilities.util-linux-ng/5038,
Have fun,
Berny
>From cd30ce6baa45fe9b58c50fea0caf3ab8bd81a066 Mon Sep 17 00:00:00 2001
From: Bernhard Voelker <mail@xxxxxxxxxxxxxxxxxxx>
Date: Wed, 16 Nov 2011 17:42:01 +0100
Subject: [PATCH] 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@xxxxxxxxxxxxxxxxxxx>
---
sys-utils/prlimit.1 | 14 +++++++++++++-
sys-utils/prlimit.c | 17 +++++++++++++----
2 files changed, 26 insertions(+), 5 deletions(-)
diff --git a/sys-utils/prlimit.1 b/sys-utils/prlimit.1
index cc40ac4..6b91214 100644
--- a/sys-utils/prlimit.1
+++ b/sys-utils/prlimit.1
@@ -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),
diff --git a/sys-utils/prlimit.c b/sys-utils/prlimit.c
index bcbfb5a..1d91909 100644
--- a/sys-utils/prlimit.c
+++ b/sys-utils/prlimit.c
@@ -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 */
@@ -632,6 +635,12 @@ 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;
}
--
1.7.3.4
