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/* vi: set sw=4 ts=4: */
/*
* ulimit builtin
*
* Adapted from ash applet code
*
* This code, originally by Doug Gwyn, Doug Kingston, Eric Gisin, and
* Michael Rendell was ripped from pdksh 5.0.8 and hacked for use with
* ash by J.T. Conklin.
*
* Public domain.
*
* Copyright (c) 2010 Tobias Klauser
* Split from ash.c and slightly adapted.
*
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*/
#include "libbb.h"
#include "builtin_ulimit.h"
struct limits {
uint8_t cmd; /* RLIMIT_xxx fit into it */
uint8_t factor_shift; /* shift by to get rlim_{cur,max} values */
char option;
const char *name;
};
static const struct limits limits_tbl[] = {
#ifdef RLIMIT_FSIZE
{ RLIMIT_FSIZE, 9, 'f', "file size (blocks)" },
#endif
#ifdef RLIMIT_CPU
{ RLIMIT_CPU, 0, 't', "cpu time (seconds)" },
#endif
#ifdef RLIMIT_DATA
{ RLIMIT_DATA, 10, 'd', "data seg size (kb)" },
#endif
#ifdef RLIMIT_STACK
{ RLIMIT_STACK, 10, 's', "stack size (kb)" },
#endif
#ifdef RLIMIT_CORE
{ RLIMIT_CORE, 9, 'c', "core file size (blocks)" },
#endif
#ifdef RLIMIT_RSS
{ RLIMIT_RSS, 10, 'm', "resident set size (kb)" },
#endif
#ifdef RLIMIT_MEMLOCK
{ RLIMIT_MEMLOCK, 10, 'l', "locked memory (kb)" },
#endif
#ifdef RLIMIT_NPROC
{ RLIMIT_NPROC, 0, 'p', "processes" },
#endif
#ifdef RLIMIT_NOFILE
{ RLIMIT_NOFILE, 0, 'n', "file descriptors" },
#endif
#ifdef RLIMIT_AS
{ RLIMIT_AS, 10, 'v', "address space (kb)" },
#endif
#ifdef RLIMIT_LOCKS
{ RLIMIT_LOCKS, 0, 'w', "locks" },
#endif
};
enum {
OPT_hard = (1 << 0),
OPT_soft = (1 << 1),
};
/* "-": treat args as parameters of option with ASCII code 1 */
static const char ulimit_opt_string[] = "-HSa"
#ifdef RLIMIT_FSIZE
"f::"
#endif
#ifdef RLIMIT_CPU
"t::"
#endif
#ifdef RLIMIT_DATA
"d::"
#endif
#ifdef RLIMIT_STACK
"s::"
#endif
#ifdef RLIMIT_CORE
"c::"
#endif
#ifdef RLIMIT_RSS
"m::"
#endif
#ifdef RLIMIT_MEMLOCK
"l::"
#endif
#ifdef RLIMIT_NPROC
"p::"
#endif
#ifdef RLIMIT_NOFILE
"n::"
#endif
#ifdef RLIMIT_AS
"v::"
#endif
#ifdef RLIMIT_LOCKS
"w::"
#endif
;
static void printlim(unsigned opts, const struct rlimit *limit,
const struct limits *l)
{
rlim_t val;
val = limit->rlim_max;
if (!(opts & OPT_hard))
val = limit->rlim_cur;
if (val == RLIM_INFINITY)
printf("unlimited\n");
else {
val >>= l->factor_shift;
printf("%llu\n", (long long) val);
}
}
int FAST_FUNC shell_builtin_ulimit(char **argv)
{
unsigned opts;
unsigned argc;
/* We can't use getopt32: need to handle commands like
* ulimit 123 -c2 -l 456
*/
/* In case getopt was already called:
* reset the libc getopt() function, which keeps internal state.
*/
#ifdef __GLIBC__
optind = 0;
#else /* BSD style */
optind = 1;
/* optreset = 1; */
#endif
/* optarg = NULL; opterr = 0; optopt = 0; - do we need this?? */
argc = 1;
while (argv[argc])
argc++;
opts = 0;
while (1) {
struct rlimit limit;
const struct limits *l;
int opt_char = getopt(argc, argv, ulimit_opt_string);
if (opt_char == -1)
break;
if (opt_char == 'H') {
opts |= OPT_hard;
continue;
}
if (opt_char == 'S') {
opts |= OPT_soft;
continue;
}
if (opt_char == 'a') {
for (l = limits_tbl; l != &limits_tbl[ARRAY_SIZE(limits_tbl)]; l++) {
getrlimit(l->cmd, &limit);
printf("-%c: %-30s ", l->option, l->name);
printlim(opts, &limit, l);
}
continue;
}
if (opt_char == 1)
opt_char = 'f';
for (l = limits_tbl; l != &limits_tbl[ARRAY_SIZE(limits_tbl)]; l++) {
if (opt_char == l->option) {
char *val_str = optarg ? optarg : (argv[optind] && argv[optind][0] != '-' ? argv[optind] : NULL);
getrlimit(l->cmd, &limit);
if (val_str) {
rlim_t val;
if (!optarg) /* -c NNN: make getopt skip NNN */
optind++;
if (strcmp(val_str, "unlimited") == 0)
val = RLIM_INFINITY;
else {
if (sizeof(val) == sizeof(int))
val = bb_strtou(val_str, NULL, 10);
else if (sizeof(val) == sizeof(long))
val = bb_strtoul(val_str, NULL, 10);
else
val = bb_strtoull(val_str, NULL, 10);
if (errno) {
bb_error_msg("bad number");
return EXIT_FAILURE;
}
val <<= l->factor_shift;
}
//bb_error_msg("opt %c val_str:'%s' val:%lld", opt_char, val_str, (long long)val);
if (opts & OPT_hard)
limit.rlim_max = val;
if ((opts & OPT_soft) || opts == 0)
limit.rlim_cur = val;
//bb_error_msg("setrlimit(%d, %lld, %lld)", l->cmd, (long long)limit.rlim_cur, (long long)limit.rlim_max);
if (setrlimit(l->cmd, &limit) < 0) {
bb_perror_msg("error setting limit");
return EXIT_FAILURE;
}
} else {
printlim(opts, &limit, l);
}
break;
}
} /* for (every possible opt) */
if (l == &limits_tbl[ARRAY_SIZE(limits_tbl)]) {
/* bad option. getopt already complained. */
break;
}
} /* while (there are options) */
return 0;
}
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