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/* $OpenBSD: c_ulimit.c,v 1.29 2019/06/28 13:34:59 deraadt Exp $ */
/*
ulimit -- handle "ulimit" builtin
Reworked to use getrusage() and ulimit() at once (as needed on
some schizophrenic systems, eg, HP-UX 9.01), made argument parsing
conform to at&t ksh, added autoconf support. Michael Rendell, May, '94
Eric Gisin, September 1988
Adapted to PD KornShell. Removed AT&T code.
last edit: 06-Jun-1987 D A Gwyn
This started out as the BRL UNIX System V system call emulation
for 4.nBSD, and was later extended by Doug Kingston to handle
the extended 4.nBSD resource limits. It now includes the code
that was originally under case SYSULIMIT in source file "xec.c".
*/
#include <sys/resource.h>
#include <ctype.h>
#include <errno.h>
#include <inttypes.h>
#include <string.h>
#include "sh.h"
#define SOFT 0x1
#define HARD 0x2
struct limits {
const char *name;
int resource; /* resource to get/set */
int factor; /* multiply by to get rlim_{cur,max} values */
char option; /* option character (-d, -f, ...) */
};
static void print_ulimit(const struct limits *, int);
static int set_ulimit(const struct limits *, const char *, int);
int
c_ulimit(char **wp)
{
static const struct limits limits[] = {
/* Do not use options -H, -S or -a or change the order. */
{ "time(cpu-seconds)", RLIMIT_CPU, 1, 't' },
{ "file(blocks)", RLIMIT_FSIZE, 512, 'f' },
{ "coredump(blocks)", RLIMIT_CORE, 512, 'c' },
{ "data(kbytes)", RLIMIT_DATA, 1024, 'd' },
{ "stack(kbytes)", RLIMIT_STACK, 1024, 's' },
{ "lockedmem(kbytes)", RLIMIT_MEMLOCK, 1024, 'l' },
{ "memory(kbytes)", RLIMIT_RSS, 1024, 'm' },
{ "nofiles(descriptors)", RLIMIT_NOFILE, 1, 'n' },
{ "processes", RLIMIT_NPROC, 1, 'p' },
{ NULL }
};
const char *options = "HSat#f#c#d#s#l#m#n#p#";
int how = SOFT | HARD;
const struct limits *l;
int optc, all = 0;
/* First check for -a, -H and -S. */
while ((optc = ksh_getopt(wp, &builtin_opt, options)) != -1)
switch (optc) {
case 'H':
how = HARD;
break;
case 'S':
how = SOFT;
break;
case 'a':
all = 1;
break;
case '?':
return 1;
default:
break;
}
if (wp[builtin_opt.optind] != NULL) {
bi_errorf("usage: ulimit [-acdfHlmnpSst] [value]");
return 1;
}
/* Then parse and act on the actual limits, one at a time */
ksh_getopt_reset(&builtin_opt, GF_ERROR);
while ((optc = ksh_getopt(wp, &builtin_opt, options)) != -1)
switch (optc) {
case 'a':
case 'H':
case 'S':
break;
case '?':
return 1;
default:
for (l = limits; l->name && l->option != optc; l++)
;
if (!l->name) {
internal_warningf("%s: %c", __func__, optc);
return 1;
}
if (builtin_opt.optarg) {
if (set_ulimit(l, builtin_opt.optarg, how))
return 1;
} else
print_ulimit(l, how);
break;
}
wp += builtin_opt.optind;
if (all) {
for (l = limits; l->name; l++) {
shprintf("%-20s ", l->name);
print_ulimit(l, how);
}
} else if (builtin_opt.optind == 1) {
/* No limit specified, use file size */
l = &limits[1];
if (wp[0] != NULL) {
if (set_ulimit(l, wp[0], how))
return 1;
wp++;
} else {
print_ulimit(l, how);
}
}
return 0;
}
static int
set_ulimit(const struct limits *l, const char *v, int how)
{
rlim_t val = 0;
struct rlimit limit;
if (strcmp(v, "unlimited") == 0)
val = RLIM_INFINITY;
else {
int64_t rval;
if (!evaluate(v, &rval, KSH_RETURN_ERROR, false))
return 1;
/*
* Avoid problems caused by typos that evaluate misses due
* to evaluating unset parameters to 0...
* If this causes problems, will have to add parameter to
* evaluate() to control if unset params are 0 or an error.
*/
if (!rval && !digit(v[0])) {
bi_errorf("invalid limit: %s", v);
return 1;
}
val = (rlim_t)rval * l->factor;
}
getrlimit(l->resource, &limit);
if (how & SOFT)
limit.rlim_cur = val;
if (how & HARD)
limit.rlim_max = val;
if (setrlimit(l->resource, &limit) == -1) {
if (errno == EPERM)
bi_errorf("-%c exceeds allowable limit", l->option);
else
bi_errorf("bad -%c limit: %s", l->option,
strerror(errno));
return 1;
}
return 0;
}
static void
print_ulimit(const struct limits *l, int how)
{
rlim_t val = 0;
struct rlimit limit;
getrlimit(l->resource, &limit);
if (how & SOFT)
val = limit.rlim_cur;
else if (how & HARD)
val = limit.rlim_max;
if (val == RLIM_INFINITY)
shprintf("unlimited\n");
else {
val /= l->factor;
shprintf("%" PRIi64 "\n", (int64_t) val);
}
}
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