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/* $OpenBSD: c_ulimit.c,v 1.15 2006/03/12 00:26:58 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 "sh.h"
#include <sys/resource.h>
#define SOFT 0x1
#define HARD 0x2
int
c_ulimit(char **wp)
{
static const struct limits {
const char *name;
enum { RLIMIT, ULIMIT } which;
int gcmd; /* get command */
int scmd; /* set command (or -1, if no set command) */
int factor; /* multiply by to get rlim_{cur,max} values */
char option;
} limits[] = {
/* Do not use options -H, -S or -a */
{ "time(cpu-seconds)", RLIMIT, RLIMIT_CPU, RLIMIT_CPU, 1, 't' },
{ "file(blocks)", RLIMIT, RLIMIT_FSIZE, RLIMIT_FSIZE, 512, 'f' },
{ "coredump(blocks)", RLIMIT, RLIMIT_CORE, RLIMIT_CORE, 512, 'c' },
{ "data(kbytes)", RLIMIT, RLIMIT_DATA, RLIMIT_DATA, 1024, 'd' },
{ "stack(kbytes)", RLIMIT, RLIMIT_STACK, RLIMIT_STACK, 1024, 's' },
{ "lockedmem(kbytes)", RLIMIT, RLIMIT_MEMLOCK, RLIMIT_MEMLOCK,
1024, 'l' },
{ "memory(kbytes)", RLIMIT, RLIMIT_RSS, RLIMIT_RSS, 1024, 'm' },
{ "nofiles(descriptors)", RLIMIT, RLIMIT_NOFILE, RLIMIT_NOFILE,
1, 'n' },
{ "processes", RLIMIT, RLIMIT_NPROC, RLIMIT_NPROC, 1, 'p' },
#ifdef RLIMIT_VMEM
{ "vmemory(kbytes)", RLIMIT, RLIMIT_VMEM, RLIMIT_VMEM, 1024, 'v' },
#endif /* RLIMIT_VMEM */
{ (char *) 0 }
};
static char options[3 + NELEM(limits)];
rlim_t val = 0;
int how = SOFT | HARD;
const struct limits *l;
int set, all = 0;
int optc, what;
struct rlimit limit;
if (!options[0]) {
/* build options string on first call - yuck */
char *p = options;
*p++ = 'H'; *p++ = 'S'; *p++ = 'a';
for (l = limits; l->name; l++)
*p++ = l->option;
*p = '\0';
}
what = 'f';
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:
what = optc;
}
for (l = limits; l->name && l->option != what; l++)
;
if (!l->name) {
internal_errorf(0, "ulimit: %c", what);
return 1;
}
wp += builtin_opt.optind;
set = *wp ? 1 : 0;
if (set) {
if (all || wp[1]) {
bi_errorf("too many arguments");
return 1;
}
if (strcmp(wp[0], "unlimited") == 0)
val = RLIM_INFINITY;
else {
long rval;
if (!evaluate(wp[0], &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(wp[0][0])) {
bi_errorf("invalid limit: %s", wp[0]);
return 1;
}
val = rval * l->factor;
}
}
if (all) {
for (l = limits; l->name; l++) {
if (l->which == RLIMIT) {
getrlimit(l->gcmd, &limit);
if (how & SOFT)
val = limit.rlim_cur;
else if (how & HARD)
val = limit.rlim_max;
}
shprintf("%-20s ", l->name);
if (val == RLIM_INFINITY)
shprintf("unlimited\n");
else {
val /= l->factor;
shprintf("%ld\n", (long) val);
}
}
return 0;
}
if (l->which == RLIMIT) {
getrlimit(l->gcmd, &limit);
if (set) {
if (how & SOFT)
limit.rlim_cur = val;
if (how & HARD)
limit.rlim_max = val;
if (setrlimit(l->scmd, &limit) < 0) {
if (errno == EPERM)
bi_errorf("exceeds allowable limit");
else
bi_errorf("bad limit: %s",
strerror(errno));
return 1;
}
} else {
if (how & SOFT)
val = limit.rlim_cur;
else if (how & HARD)
val = limit.rlim_max;
}
}
if (!set) {
if (val == RLIM_INFINITY)
shprintf("unlimited\n");
else {
val /= l->factor;
shprintf("%ld\n", (long) val);
}
}
return 0;
}
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