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zsh/Src/Builtins/rlimits.c
Tanaka Akira e74702b467 Initial revision
1999-04-15 18:05:38 +00:00

594 lines
16 KiB
C
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/*
* rlimits.c - resource limit builtins
*
* This file is part of zsh, the Z shell.
*
* Copyright (c) 1992-1997 Paul Falstad
* All rights reserved.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and to distribute modified versions of this software for any
* purpose, provided that the above copyright notice and the following
* two paragraphs appear in all copies of this software.
*
* In no event shall Paul Falstad or the Zsh Development Group be liable
* to any party for direct, indirect, special, incidental, or consequential
* damages arising out of the use of this software and its documentation,
* even if Paul Falstad and the Zsh Development Group have been advised of
* the possibility of such damage.
*
* Paul Falstad and the Zsh Development Group specifically disclaim any
* warranties, including, but not limited to, the implied warranties of
* merchantability and fitness for a particular purpose. The software
* provided hereunder is on an "as is" basis, and Paul Falstad and the
* Zsh Development Group have no obligation to provide maintenance,
* support, updates, enhancements, or modifications.
*
*/
#include "rlimits.mdh"
#include "rlimits.pro"
#if defined(HAVE_GETRLIMIT) && defined(RLIM_INFINITY)
/* Generated rec array containing limits required for the limit builtin. *
* They must appear in this array in numerical order of the RLIMIT_* macros. */
# include "rlimits.h"
# if defined(RLIM_T_IS_QUAD_T) || defined(RLIM_T_IS_UNSIGNED)
static rlim_t
zstrtorlimt(const char *s, char **t, int base)
{
rlim_t ret = 0;
if (!base)
if (*s != '0')
base = 10;
else if (*++s == 'x' || *s == 'X')
base = 16, s++;
else
base = 8;
if (base <= 10)
for (; *s >= '0' && *s < ('0' + base); s++)
ret = ret * base + *s - '0';
else
for (; idigit(*s) || (*s >= 'a' && *s < ('a' + base - 10))
|| (*s >= 'A' && *s < ('A' + base - 10)); s++)
ret = ret * base + (idigit(*s) ? (*s - '0') : (*s & 0x1f) + 9);
if (t)
*t = (char *)s;
return ret;
}
# else /* !RLIM_T_IS_QUAD_T && !RLIM_T_IS_UNSIGNED */
# define zstrtorlimt(a, b, c) zstrtol((a), (b), (c))
# endif /* !RLIM_T_IS_QUAD_T && !RLIM_T_IS_UNSIGNED */
/* Display resource limits. hard indicates whether `hard' or `soft' *
* limits should be displayed. lim specifies the limit, or may be -1 *
* to show all. */
/**/
static void
showlimits(int hard, int lim)
{
int rt;
rlim_t val;
/* main loop over resource types */
for (rt = 0; rt != ZSH_NLIMITS; rt++)
if (rt == lim || lim == -1) {
/* display limit for resource number rt */
printf("%-16s", recs[rt]);
val = (hard) ? limits[rt].rlim_max : limits[rt].rlim_cur;
if (val == RLIM_INFINITY)
printf("unlimited\n");
else if (rt==RLIMIT_CPU)
/* time-type resource -- display as hours, minutes and
seconds. */
printf("%d:%02d:%02d\n", (int)(val / 3600),
(int)(val / 60) % 60, (int)(val % 60));
# ifdef RLIMIT_NPROC
else if (rt == RLIMIT_NPROC)
/* pure numeric resource */
printf("%d\n", (int)val);
# endif /* RLIMIT_NPROC */
# ifdef RLIMIT_NOFILE
else if (rt == RLIMIT_NOFILE)
/* pure numeric resource */
printf("%d\n", (int)val);
# endif /* RLIMIT_NOFILE */
else if (val >= 1024L * 1024L)
/* memory resource -- display with `K' or `M' modifier */
# ifdef RLIM_T_IS_QUAD_T
printf("%qdMB\n", val / (1024L * 1024L));
else
printf("%qdkB\n", val / 1024L);
# else
printf("%ldMB\n", val / (1024L * 1024L));
else
printf("%ldkB\n", val / 1024L);
# endif /* RLIM_T_IS_QUAD_T */
}
}
/* Display a resource limit, in ulimit style. lim specifies which *
* limit should be displayed, and hard indicates whether the hard or *
* soft limit should be displayed. */
/**/
static void
printulimit(int lim, int hard, int head)
{
rlim_t limit;
/* get the limit in question */
limit = (hard) ? limits[lim].rlim_max : limits[lim].rlim_cur;
/* display the appropriate heading */
switch (lim) {
case RLIMIT_CPU:
if (head)
printf("cpu time (seconds) ");
break;
case RLIMIT_FSIZE:
if (head)
printf("file size (blocks) ");
if (limit != RLIM_INFINITY)
limit /= 512;
break;
case RLIMIT_DATA:
if (head)
printf("data seg size (kbytes) ");
if (limit != RLIM_INFINITY)
limit /= 1024;
break;
case RLIMIT_STACK:
if (head)
printf("stack size (kbytes) ");
if (limit != RLIM_INFINITY)
limit /= 1024;
break;
case RLIMIT_CORE:
if (head)
printf("core file size (blocks) ");
if (limit != RLIM_INFINITY)
limit /= 512;
break;
# ifdef RLIMIT_RSS
case RLIMIT_RSS:
if (head)
printf("resident set size (kbytes) ");
if (limit != RLIM_INFINITY)
limit /= 1024;
break;
# endif /* RLIMIT_RSS */
# ifdef RLIMIT_MEMLOCK
case RLIMIT_MEMLOCK:
if (head)
printf("locked-in-memory size (kb) ");
if (limit != RLIM_INFINITY)
limit /= 1024;
break;
# endif /* RLIMIT_MEMLOCK */
# ifdef RLIMIT_NPROC
case RLIMIT_NPROC:
if (head)
printf("processes ");
break;
# endif /* RLIMIT_NPROC */
# ifdef RLIMIT_NOFILE
case RLIMIT_NOFILE:
if (head)
printf("file descriptors ");
break;
# endif /* RLIMIT_NOFILE */
# ifdef RLIMIT_VMEM
case RLIMIT_VMEM:
if (head)
printf("virtual memory size (kb) ");
if (limit != RLIM_INFINITY)
limit /= 1024;
break;
# endif /* RLIMIT_VMEM */
# if defined RLIMIT_AS && RLIMIT_AS != RLIMIT_VMEM
case RLIMIT_AS:
if (head)
printf("address space (kb) ");
if (limit != RLIM_INFINITY)
limit /= 1024;
break;
# endif /* RLIMIT_AS */
# ifdef RLIMIT_TCACHE
case RLIMIT_TCACHE:
if (head)
printf("cached threads ");
break;
# endif /* RLIMIT_TCACHE */
}
/* display the limit */
if (limit == RLIM_INFINITY)
printf("unlimited\n");
else
printf("%ld\n", (long)limit);
}
/* limit: set or show resource limits. The variable hard indicates *
* whether `hard' or `soft' resource limits are being set/shown. */
/**/
static int
bin_limit(char *nam, char **argv, char *ops, int func)
{
char *s;
int hard, limnum, lim;
rlim_t val;
int ret = 0;
hard = ops['h'];
if (ops['s'] && !*argv)
return setlimits(NULL);
/* without arguments, display limits */
if (!*argv) {
showlimits(hard, -1);
return 0;
}
while ((s = *argv++)) {
/* Search for the appropriate resource name. When a name matches (i.e. *
* starts with) the argument, the lim variable changes from -1 to the *
* number of the resource. If another match is found, lim goes to -2. */
for (lim = -1, limnum = 0; limnum < ZSH_NLIMITS; limnum++)
if (!strncmp(recs[limnum], s, strlen(s))) {
if (lim != -1)
lim = -2;
else
lim = limnum;
}
/* lim==-1 indicates that no matches were found. *
* lim==-2 indicates that multiple matches were found. */
if (lim < 0) {
zwarnnam("limit",
(lim == -2) ? "ambiguous resource specification: %s"
: "no such resource: %s", s, 0);
return 1;
}
/* without value for limit, display the current limit */
if (!(s = *argv++)) {
showlimits(hard, lim);
return 0;
}
if (lim==RLIMIT_CPU) {
/* time-type resource -- may be specified as seconds, or minutes or *
* hours with the `m' and `h' modifiers, and `:' may be used to add *
* together more than one of these. It's easier to understand from *
* the code: */
val = zstrtorlimt(s, &s, 10);
if (*s)
if ((*s == 'h' || *s == 'H') && !s[1])
val *= 3600L;
else if ((*s == 'm' || *s == 'M') && !s[1])
val *= 60L;
else if (*s == ':')
val = val * 60 + zstrtorlimt(s + 1, &s, 10);
else {
zwarnnam("limit", "unknown scaling factor: %s", s, 0);
return 1;
}
}
# ifdef RLIMIT_NPROC
else if (lim == RLIMIT_NPROC)
/* pure numeric resource -- only a straight decimal number is
permitted. */
val = zstrtorlimt(s, &s, 10);
# endif /* RLIMIT_NPROC */
# ifdef RLIMIT_NOFILE
else if (lim == RLIMIT_NOFILE)
/* pure numeric resource -- only a straight decimal number is
permitted. */
val = zstrtorlimt(s, &s, 10);
# endif /* RLIMIT_NOFILE */
else {
/* memory-type resource -- `k' and `M' modifiers are permitted,
meaning (respectively) 2^10 and 2^20. */
val = zstrtorlimt(s, &s, 10);
if (!*s || ((*s == 'k' || *s == 'K') && !s[1]))
val *= 1024L;
else if ((*s == 'M' || *s == 'm') && !s[1])
val *= 1024L * 1024;
else {
zwarnnam("limit", "unknown scaling factor: %s", s, 0);
return 1;
}
}
/* new limit is valid and has been interpreted; apply it to the
specified resource */
if (hard) {
/* can only raise hard limits if running as root */
if (val > current_limits[lim].rlim_max && geteuid()) {
zwarnnam("limit", "can't raise hard limits", NULL, 0);
return 1;
} else {
limits[lim].rlim_max = val;
if (val < limits[lim].rlim_cur)
limits[lim].rlim_cur = val;
}
} else if (val > limits[lim].rlim_max) {
zwarnnam("limit", "limit exceeds hard limit", NULL, 0);
return 1;
} else
limits[lim].rlim_cur = val;
if (ops['s'] && zsetlimit(lim, "limit"))
ret++;
}
return ret;
}
/* unlimit: remove resource limits. Much of this code is the same as *
* that in bin_limit(). */
/**/
static int
bin_unlimit(char *nam, char **argv, char *ops, int func)
{
int hard, limnum, lim;
int ret = 0;
uid_t euid = geteuid();
hard = ops['h'];
/* Without arguments, remove all limits. */
if (!*argv) {
for (limnum = 0; limnum != RLIM_NLIMITS; limnum++) {
if (hard)
if (euid && current_limits[limnum].rlim_max != RLIM_INFINITY)
ret++;
else
limits[limnum].rlim_max = RLIM_INFINITY;
else
limits[limnum].rlim_cur = limits[limnum].rlim_max;
}
if (ops['s'])
ret += setlimits(nam);
if (ret)
zwarnnam(nam, "can't remove hard limits", NULL, 0);
} else {
for (; *argv; argv++) {
/* Search for the appropriate resource name. When a name *
* matches (i.e. starts with) the argument, the lim variable *
* changes from -1 to the number of the resource. If another *
* match is found, lim goes to -2. */
for (lim = -1, limnum = 0; limnum < ZSH_NLIMITS; limnum++)
if (!strncmp(recs[limnum], *argv, strlen(*argv))) {
if (lim != -1)
lim = -2;
else
lim = limnum;
}
/* lim==-1 indicates that no matches were found. *
* lim==-2 indicates that multiple matches were found. */
if (lim < 0) {
zwarnnam(nam,
(lim == -2) ? "ambiguous resource specification: %s"
: "no such resource: %s", *argv, 0);
return 1;
}
/* remove specified limit */
if (hard)
if (euid && current_limits[lim].rlim_max != RLIM_INFINITY) {
zwarnnam(nam, "can't remove hard limits", NULL, 0);
ret++;
} else
limits[lim].rlim_max = RLIM_INFINITY;
else
limits[lim].rlim_cur = limits[lim].rlim_max;
if (ops['s'] && zsetlimit(lim, nam))
ret++;
}
}
return ret;
}
/* ulimit: set or display resource limits */
/**/
static int
bin_ulimit(char *name, char **argv, char *ops, int func)
{
int res, resmask = 0, hard = 0, soft = 0, nres = 0;
char *options;
do {
options = *argv;
if (options && *options == '-' && !options[1]) {
zwarnnam(name, "missing option letter", NULL, 0);
return 1;
}
res = -1;
if (options && *options == '-') {
argv++;
while (*++options) {
if(*options == Meta)
*++options ^= 32;
res = -1;
switch (*options) {
case 'H':
hard = 1;
continue;
case 'S':
soft = 1;
continue;
case 'a':
if (*argv || options[1] || resmask) {
zwarnnam(name, "no arguments required after -a",
NULL, 0);
return 1;
}
resmask = (1 << RLIM_NLIMITS) - 1;
nres = RLIM_NLIMITS;
continue;
case 't':
res = RLIMIT_CPU;
break;
case 'f':
res = RLIMIT_FSIZE;
break;
case 'd':
res = RLIMIT_DATA;
break;
case 's':
res = RLIMIT_STACK;
break;
case 'c':
res = RLIMIT_CORE;
break;
# ifdef RLIMIT_RSS
case 'm':
res = RLIMIT_RSS;
break;
# endif /* RLIMIT_RSS */
# ifdef RLIMIT_MEMLOCK
case 'l':
res = RLIMIT_MEMLOCK;
break;
# endif /* RLIMIT_MEMLOCK */
# ifdef RLIMIT_NOFILE
case 'n':
res = RLIMIT_NOFILE;
break;
# endif /* RLIMIT_NOFILE */
# ifdef RLIMIT_NPROC
case 'u':
res = RLIMIT_NPROC;
break;
# endif /* RLIMIT_NPROC */
# ifdef RLIMIT_VMEM
case 'v':
res = RLIMIT_VMEM;
break;
# endif /* RLIMIT_VMEM */
default:
/* unrecognised limit */
zwarnnam(name, "bad option: -%c", NULL, *options);
return 1;
}
if (options[1]) {
resmask |= 1 << res;
nres++;
}
}
}
if (!*argv || **argv == '-') {
if (res < 0)
if (*argv || nres)
continue;
else
res = RLIMIT_FSIZE;
resmask |= 1 << res;
nres++;
continue;
}
if (res < 0)
res = RLIMIT_FSIZE;
if (strcmp(*argv, "unlimited")) {
/* set limit to specified value */
rlim_t limit;
limit = zstrtorlimt(*argv, NULL, 10);
/* scale appropriately */
switch (res) {
case RLIMIT_FSIZE:
case RLIMIT_CORE:
limit *= 512;
break;
case RLIMIT_DATA:
case RLIMIT_STACK:
# ifdef RLIMIT_RSS
case RLIMIT_RSS:
# endif /* RLIMIT_RSS */
# ifdef RLIMIT_MEMLOCK
case RLIMIT_MEMLOCK:
# endif /* RLIMIT_MEMLOCK */
# ifdef RLIMIT_VMEM
case RLIMIT_VMEM:
# endif /* RLIMIT_VMEM */
limit *= 1024;
break;
}
if (hard) {
/* can't raise hard limit unless running as root */
if (limit > current_limits[res].rlim_max && geteuid()) {
zwarnnam(name, "can't raise hard limits", NULL, 0);
return 1;
}
limits[res].rlim_max = limit;
if (limit < limits[res].rlim_cur)
limits[res].rlim_cur = limit;
}
if (!hard || soft) {
/* can't raise soft limit above hard limit */
if (limit > limits[res].rlim_max) {
if (limit > current_limits[res].rlim_max && geteuid()) {
zwarnnam(name, "value exceeds hard limit", NULL, 0);
return 1;
}
limits[res].rlim_max = limits[res].rlim_cur = limit;
} else
limits[res].rlim_cur = limit;
}
} else {
/* remove specified limit */
if (hard) {
/* can't remove hard limit unless running as root */
if (current_limits[res].rlim_max != RLIM_INFINITY && geteuid()) {
zwarnnam(name, "can't remove hard limits", NULL, 0);
return 1;
}
limits[res].rlim_max = RLIM_INFINITY;
}
if (!hard || soft)
/* `removal' of soft limit means setting it equal to the
corresponding hard limit */
limits[res].rlim_cur = limits[res].rlim_max;
}
if (zsetlimit(res, name))
return 1;
argv++;
} while (*argv);
for (res = 0; res < RLIM_NLIMITS; res++, resmask >>= 1)
if (resmask & 1)
printulimit(res, hard, nres > 1);
return 0;
}
#else /* !HAVE_GETRLIMIT || !RLIM_INFINITY */
# define bin_limit bin_notavail
# define bin_ulimit bin_notavail
# define bin_unlimit bin_notavail
#endif /* !HAVE_GETRLIMIT || !RLIM_INFINITY */
static struct builtin bintab[] = {
BUILTIN("limit", 0, bin_limit, 0, -1, 0, "sh", NULL),
BUILTIN("ulimit", 0, bin_ulimit, 0, -1, 0, NULL, NULL),
BUILTIN("unlimit", 0, bin_unlimit, 0, -1, 0, "hs", NULL),
};
/**/
int
boot_rlimits(Module m)
{
return !addbuiltins(m->nam, bintab, sizeof(bintab)/sizeof(*bintab));
}
#ifdef MODULE
/**/
int
cleanup_rlimits(Module m)
{
deletebuiltins(m->nam, bintab, sizeof(bintab)/sizeof(*bintab));
return 0;
}
#endif
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