Implement the "ulimit" builtin. This is the analogon to csh's "limit"
command and badly needed in sh(1) for everybody who wants to modify the system-wide limits from inside /etc/rc. The options are similar to other system's implemantations of this command, with the FreeBSD additions for -m (memoryuse) and -p (max processes) that are not available on other systems.
This commit is contained in:
Joerg Wunsch
parent
c2cb0dfbf0
commit
7a2afe644c
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=11571
@ -35,7 +35,7 @@
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# SUCH DAMAGE.
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#
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# @(#)builtins 8.1 (Berkeley) 5/31/93
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# $Id$
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# $Id: builtins,v 1.2 1994/09/24 02:57:23 davidg Exp $
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#
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# This file lists all the builtin commands. The first column is the name
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@ -83,6 +83,7 @@ setvarcmd setvar
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shiftcmd shift
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trapcmd trap
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truecmd : true
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ulimitcmd ulimit
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umaskcmd umask
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unaliascmd unalias
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unsetcmd unset
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@ -4,6 +4,7 @@
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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* The ulimit() builtin has been contributed by Joerg Wunsch.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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@ -33,7 +34,7 @@
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id$
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* $Id: miscbltin.c,v 1.2 1994/09/24 02:57:52 davidg Exp $
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*/
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#ifndef lint
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@ -52,6 +53,18 @@ static char sccsid[] = "@(#)miscbltin.c 8.2 (Berkeley) 4/16/94";
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#include "error.h"
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#include "mystring.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#if BSD
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#include <limits.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#endif
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#undef eflag
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extern char **argptr; /* argument list for builtin command */
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@ -166,3 +179,203 @@ umaskcmd(argc, argv) char **argv; {
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}
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return 0;
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}
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#if BSD
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struct restab {
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int resource;
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int scale;
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char *descript;
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};
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/* multi-purpose */
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#define RLIMIT_UNSPEC (-2)
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/* resource */
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#define RLIMIT_ALL (-1)
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/* mode */
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#define RLIMIT_SHOW 0
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#define RLIMIT_SET 1
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/* what */
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#define RLIMIT_SOFT 1
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#define RLIMIT_HARD 2
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static struct restab restab[] = {
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{RLIMIT_CORE, 512, "coredump(512-blocks) "},
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{RLIMIT_CPU, 1, "time(seconds) "},
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{RLIMIT_DATA, 1024, "datasize(kilobytes) "},
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{RLIMIT_FSIZE, 512, "filesize(512-blocks) "},
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{RLIMIT_MEMLOCK, 1024, "lockedmem(kilobytes) "},
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{RLIMIT_NOFILE, 1, "nofiles(descriptors) "},
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{RLIMIT_NPROC, 1, "processes(max) "},
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{RLIMIT_RSS, 1024, "memoryuse(kilobytes) "},
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{RLIMIT_STACK, 1024, "stacksize(kilobytes) "}
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};
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/* get entry into above table */
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static struct restab *
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find_resource(resource) {
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int i;
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struct restab *rp;
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for(i = 0, rp = restab;
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i < sizeof restab / sizeof(struct restab);
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i++, rp++)
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if(rp->resource == resource)
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return rp;
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error("internal error: resource not in table");
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return 0;
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}
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static void
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print_resource(rp, what, with_descript) struct restab *rp; {
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struct rlimit rlim;
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quad_t val;
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(void)getrlimit(rp->resource, &rlim);
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val = (what == RLIMIT_SOFT)?
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rlim.rlim_cur: rlim.rlim_max;
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if(with_descript)
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out1str(rp->descript);
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if(val == RLIM_INFINITY)
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out1str("unlimited\n");
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else {
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val /= (quad_t)rp->scale;
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if(val > (quad_t)ULONG_MAX)
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out1fmt("> %lu\n", (unsigned long)ULONG_MAX);
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else
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out1fmt("%lu\n", (unsigned long)val);
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}
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}
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ulimitcmd(argc, argv) char **argv; {
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struct rlimit rlim;
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char *p;
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int i;
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int resource = RLIMIT_UNSPEC;
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quad_t val;
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int what = RLIMIT_UNSPEC;
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int mode = RLIMIT_UNSPEC;
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int errs = 0, arg = 1;
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struct restab *rp;
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extern int optreset; /* XXX should be declared in <stdlib.h> */
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opterr = 0; /* use own error processing */
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optreset = 1;
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optind = 1;
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while ((i = getopt(argc, argv, "HSacdfnstmlp")) != EOF) {
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arg++;
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switch(i) {
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case 'H':
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if(what == RLIMIT_UNSPEC) what = 0;
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what |= RLIMIT_HARD;
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break;
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case 'S':
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if(what == RLIMIT_UNSPEC) what = 0;
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what |= RLIMIT_SOFT;
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break;
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case 'a':
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if(resource != RLIMIT_UNSPEC) errs++;
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resource = RLIMIT_ALL;
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mode = RLIMIT_SHOW;
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break;
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case 'c':
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if(resource != RLIMIT_UNSPEC) errs++;
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resource = RLIMIT_CORE;
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break;
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case 'd':
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if(resource != RLIMIT_UNSPEC) errs++;
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resource = RLIMIT_DATA;
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break;
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case 'f':
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if(resource != RLIMIT_UNSPEC) errs++;
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resource = RLIMIT_FSIZE;
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break;
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case 'n':
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if(resource != RLIMIT_UNSPEC) errs++;
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resource = RLIMIT_NOFILE;
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break;
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case 's':
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if(resource != RLIMIT_UNSPEC) errs++;
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resource = RLIMIT_STACK;
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break;
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case 't':
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if(resource != RLIMIT_UNSPEC) errs++;
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resource = RLIMIT_CPU;
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break;
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case 'm':
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if(resource != RLIMIT_UNSPEC) errs++;
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resource = RLIMIT_RSS;
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break;
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case 'l':
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if(resource != RLIMIT_UNSPEC) errs++;
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resource = RLIMIT_MEMLOCK;
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break;
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case 'p':
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if(resource != RLIMIT_UNSPEC) errs++;
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resource = RLIMIT_NPROC;
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break;
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case '?':
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error("illegal option -%c", optopt);
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}
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}
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argc -= optind;
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argv += optind;
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if(argc > 1)
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error("too many arguments");
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if(argc == 0)
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mode = RLIMIT_SHOW;
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else if (resource == RLIMIT_ALL)
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errs++;
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else
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mode = RLIMIT_SET;
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if(mode == RLIMIT_UNSPEC)
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mode = RLIMIT_SHOW;
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if(resource == RLIMIT_UNSPEC)
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resource = RLIMIT_FSIZE;
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if(what == RLIMIT_UNSPEC)
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what = (mode == RLIMIT_SHOW)?
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RLIMIT_SOFT: (RLIMIT_SOFT|RLIMIT_HARD);
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if(mode == RLIMIT_SHOW && what == (RLIMIT_SOFT|RLIMIT_HARD))
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errs++;
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if(errs)
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error("Wrong option combination");
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if(resource == RLIMIT_ALL)
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for(i = 0; i < sizeof restab / sizeof(struct restab); i++)
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print_resource(restab + i, what, 1);
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else if(mode == RLIMIT_SHOW)
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print_resource(find_resource(resource), what, 0);
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else {
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rp = find_resource(resource);
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if(strcmp(argv[0], "unlimited") == 0)
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val = RLIM_INFINITY;
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else {
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val = 0;
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p = argv[0];
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do {
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if((i = *p - '0') < 0 || i > 9)
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error("Illegal number: %s", argv[0]);
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val = (10 * val) + (quad_t)i;
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} while (*++p != '\0');
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val *= (quad_t)rp->scale;
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}
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(void)getrlimit(resource, &rlim);
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if(what & RLIMIT_HARD)
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rlim.rlim_max = val;
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if(what & RLIMIT_SOFT)
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rlim.rlim_cur = val;
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if(setrlimit(resource, &rlim) == -1) {
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outfmt(&errout, "ulimit: bad limit: %s\n",
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strerror(errno));
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return 1;
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}
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}
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return 0;
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}
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#else /* !BSD */
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#error ulimit() not implemented
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#endif /* BSD */
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54
bin/sh/sh.1
54
bin/sh/sh.1
@ -33,7 +33,9 @@
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)sh.1 8.4 (Berkeley) 4/18/94
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.\" $Id: sh.1,v 1.2 1994/09/24 02:58:13 davidg Exp $
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.\" $Id: sh.1,v 1.3 1995/05/05 16:49:15 adam Exp $
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.\"
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.\"
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.\"
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.na
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.TH SH 1
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@ -1277,6 +1279,56 @@ resets trapped (but not ignored) signals to the
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default action. The trap command has no effect on
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signals that were ignored on entry to the shell.
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.TP
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ulimit [ -HSacdflmnpst ] [ limit ]
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Set or display resource limits (see getrlimit(2)).
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If ``limit'' is specified, the named resource will be set;
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otherwise the current resource value will be displayed.
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.br
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If ``-H'' is specified, the hard limits will be
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set or displayed. While everybody is allowed to reduce a
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hard limit, only the superuser can increase it. Option ``-S''
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specifies the soft limits instead. When displaying limits,
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only one of ``-S'' or ``-H'' can be given. The default is
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to display the soft limits, and to set both, the hard and
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the soft limits.
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.br
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Option ``-a'' requests to display all resources. The parameter
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``limit'' is not acceptable in this mode.
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.br
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The remaining options specify which resource value is to be
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displayed or modified. They are mutually exclusive.
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.RS +.7i
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.TP 2
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-c coredumpsize
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The maximal size of core dump files, in 512-byte blocks.
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.TP 2
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-d datasize
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The maximal size of the data segment of a process, in kilobytes.
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.TP 2
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-f filesize
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The maximal size of a file, in 512-byte blocks. This is the
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default.
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.TP 2
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-l lockedmem
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The maximal size of memory that can be locked by a process, in
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kilobytes.
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.TP 2
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-m memoryuse
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The maximal resident set size of a process, in kilobytes.
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.TP 2
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-n nofiles
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The maximal number of descriptors that could be opened by a process.
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.TP 2
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-p procmax
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The maximal number of simultaneous processes for this user ID.
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.TP 2
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-s stacksize
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The maximal size of the stack segment, in kilobytes.
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.TP 2
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-t time
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The maximal amount of CPU time to be used by each process, in seconds.
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.RE
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.TP
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umask [ mask ]
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Set the value of umask (see umask(2)) to the specified octal value.
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If the argument is omitted, the
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