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-rw-r--r--shell/builtin_ulimit.c227
1 files changed, 227 insertions, 0 deletions
diff --git a/shell/builtin_ulimit.c b/shell/builtin_ulimit.c
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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;
+}