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-rw-r--r--sys-utils/prlimit.c646
1 files changed, 646 insertions, 0 deletions
diff --git a/sys-utils/prlimit.c b/sys-utils/prlimit.c
new file mode 100644
index 0000000..6f80636
--- /dev/null
+++ b/sys-utils/prlimit.c
@@ -0,0 +1,646 @@
+/*
+ * prlimit - get/set process resource limits.
+ *
+ * Copyright (C) 2011 Davidlohr Bueso <dave@gnu.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <errno.h>
+#include <getopt.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <assert.h>
+#include <unistd.h>
+#include <sys/resource.h>
+
+#include <libsmartcols.h>
+
+#include "c.h"
+#include "nls.h"
+#include "xalloc.h"
+#include "strutils.h"
+#include "list.h"
+#include "closestream.h"
+
+#ifndef RLIMIT_RTTIME
+# define RLIMIT_RTTIME 15
+#endif
+
+enum {
+ AS,
+ CORE,
+ CPU,
+ DATA,
+ FSIZE,
+ LOCKS,
+ MEMLOCK,
+ MSGQUEUE,
+ NICE,
+ NOFILE,
+ NPROC,
+ RSS,
+ RTPRIO,
+ RTTIME,
+ SIGPENDING,
+ STACK
+};
+
+/* basic output flags */
+static int no_headings;
+static int raw;
+
+struct prlimit_desc {
+ const char *name;
+ const char *help;
+ const char *unit;
+ int resource;
+};
+
+static struct prlimit_desc prlimit_desc[] =
+{
+ [AS] = { "AS", N_("address space limit"), N_("bytes"), RLIMIT_AS },
+ [CORE] = { "CORE", N_("max core file size"), N_("bytes"), RLIMIT_CORE },
+ [CPU] = { "CPU", N_("CPU time"), N_("seconds"), RLIMIT_CPU },
+ [DATA] = { "DATA", N_("max data size"), N_("bytes"), RLIMIT_DATA },
+ [FSIZE] = { "FSIZE", N_("max file size"), N_("bytes"), RLIMIT_FSIZE },
+ [LOCKS] = { "LOCKS", N_("max number of file locks held"), N_("locks"), RLIMIT_LOCKS },
+ [MEMLOCK] = { "MEMLOCK", N_("max locked-in-memory address space"), N_("bytes"), RLIMIT_MEMLOCK },
+ [MSGQUEUE] = { "MSGQUEUE", N_("max bytes in POSIX mqueues"), N_("bytes"), RLIMIT_MSGQUEUE },
+ [NICE] = { "NICE", N_("max nice prio allowed to raise"), NULL, RLIMIT_NICE },
+ [NOFILE] = { "NOFILE", N_("max number of open files"), N_("files"), RLIMIT_NOFILE },
+ [NPROC] = { "NPROC", N_("max number of processes"), N_("processes"), RLIMIT_NPROC },
+ [RSS] = { "RSS", N_("max resident set size"), N_("bytes"), RLIMIT_RSS },
+ [RTPRIO] = { "RTPRIO", N_("max real-time priority"), NULL, RLIMIT_RTPRIO },
+ [RTTIME] = { "RTTIME", N_("timeout for real-time tasks"), N_("microsecs"), RLIMIT_RTTIME },
+ [SIGPENDING] = { "SIGPENDING", N_("max number of pending signals"), N_("signals"), RLIMIT_SIGPENDING },
+ [STACK] = { "STACK", N_("max stack size"), N_("bytes"), RLIMIT_STACK }
+};
+
+#define MAX_RESOURCES ARRAY_SIZE(prlimit_desc)
+
+struct prlimit {
+ struct list_head lims;
+
+ struct rlimit rlim;
+ struct prlimit_desc *desc;
+ int modify; /* PRLIMIT_{SOFT,HARD} mask */
+};
+
+#define PRLIMIT_EMPTY_LIMIT {{ 0, 0, }, NULL, 0 }
+
+enum {
+ COL_HELP,
+ COL_RES,
+ COL_SOFT,
+ COL_HARD,
+ COL_UNITS,
+};
+
+/* column names */
+struct colinfo {
+ const char *name; /* header */
+ double whint; /* width hint (N < 1 is in percent of termwidth) */
+ int flags; /* SCOLS_FL_* */
+ const char *help;
+};
+
+/* columns descriptions */
+static struct colinfo infos[] = {
+ [COL_RES] = { "RESOURCE", 0.25, SCOLS_FL_TRUNC, N_("resource name") },
+ [COL_HELP] = { "DESCRIPTION", 0.1, SCOLS_FL_TRUNC, N_("resource description")},
+ [COL_SOFT] = { "SOFT", 0.1, SCOLS_FL_RIGHT, N_("soft limit")},
+ [COL_HARD] = { "HARD", 1, SCOLS_FL_RIGHT, N_("hard limit (ceiling)")},
+ [COL_UNITS] = { "UNITS", 0.1, SCOLS_FL_TRUNC, N_("units")},
+};
+
+static int columns[ARRAY_SIZE(infos) * 2];
+static int ncolumns;
+
+
+
+#define INFINITY_STR "unlimited"
+#define INFINITY_STRLEN (sizeof(INFINITY_STR) - 1)
+
+#define PRLIMIT_SOFT (1 << 1)
+#define PRLIMIT_HARD (1 << 2)
+
+static pid_t pid; /* calling process (default) */
+static int verbose;
+
+#ifndef HAVE_PRLIMIT
+# include <sys/syscall.h>
+static int prlimit(pid_t p, int resource,
+ const struct rlimit *new_limit,
+ struct rlimit *old_limit)
+{
+ return syscall(SYS_prlimit64, p, resource, new_limit, old_limit);
+}
+#endif
+
+static void __attribute__((__noreturn__)) usage(void)
+{
+ FILE *out = stdout;
+ size_t i;
+
+ fputs(USAGE_HEADER, out);
+
+ fprintf(out,
+ _(" %s [options] [-p PID]\n"), program_invocation_short_name);
+ fprintf(out,
+ _(" %s [options] COMMAND\n"), program_invocation_short_name);
+
+ fputs(USAGE_SEPARATOR, out);
+ fputs(_("Show or change the resource limits of a process.\n"), out);
+
+ fputs(_("\nGeneral Options:\n"), out);
+ fputs(_(" -p, --pid <pid> process id\n"
+ " -o, --output <list> define which output columns to use\n"
+ " --noheadings don't print headings\n"
+ " --raw use the raw output format\n"
+ " --verbose verbose output\n"
+ ), out);
+ printf(USAGE_HELP_OPTIONS(24));
+
+ fputs(_("\nResources Options:\n"), out);
+ fputs(_(" -c, --core maximum size of core files created\n"
+ " -d, --data maximum size of a process's data segment\n"
+ " -e, --nice maximum nice priority allowed to raise\n"
+ " -f, --fsize maximum size of files written by the process\n"
+ " -i, --sigpending maximum number of pending signals\n"
+ " -l, --memlock maximum size a process may lock into memory\n"
+ " -m, --rss maximum resident set size\n"
+ " -n, --nofile maximum number of open files\n"
+ " -q, --msgqueue maximum bytes in POSIX message queues\n"
+ " -r, --rtprio maximum real-time scheduling priority\n"
+ " -s, --stack maximum stack size\n"
+ " -t, --cpu maximum amount of CPU time in seconds\n"
+ " -u, --nproc maximum number of user processes\n"
+ " -v, --as size of virtual memory\n"
+ " -x, --locks maximum number of file locks\n"
+ " -y, --rttime CPU time in microseconds a process scheduled\n"
+ " under real-time scheduling\n"), out);
+
+ fputs(USAGE_COLUMNS, out);
+ for (i = 0; i < ARRAY_SIZE(infos); i++)
+ fprintf(out, " %11s %s\n", infos[i].name, _(infos[i].help));
+
+ printf(USAGE_MAN_TAIL("prlimit(1)"));
+
+ exit(EXIT_SUCCESS);
+}
+
+static inline int get_column_id(int num)
+{
+ assert(num < ncolumns);
+ assert(columns[num] < (int) ARRAY_SIZE(infos));
+
+ return columns[num];
+}
+
+static inline struct colinfo *get_column_info(unsigned num)
+{
+ return &infos[ get_column_id(num) ];
+}
+
+static void add_scols_line(struct libscols_table *table, struct prlimit *l)
+{
+ int i;
+ struct libscols_line *line;
+
+ assert(table);
+ assert(l);
+
+ line = scols_table_new_line(table, NULL);
+ if (!line)
+ err(EXIT_FAILURE, _("failed to allocate output line"));
+
+ for (i = 0; i < ncolumns; i++) {
+ char *str = NULL;
+
+ switch (get_column_id(i)) {
+ case COL_RES:
+ str = xstrdup(l->desc->name);
+ break;
+ case COL_HELP:
+ str = xstrdup(l->desc->help);
+ break;
+ case COL_SOFT:
+ if (l->rlim.rlim_cur == RLIM_INFINITY)
+ str = xstrdup(_("unlimited"));
+ else
+ xasprintf(&str, "%llu", (unsigned long long) l->rlim.rlim_cur);
+ break;
+ case COL_HARD:
+ if (l->rlim.rlim_max == RLIM_INFINITY)
+ str = xstrdup(_("unlimited"));
+ else
+ xasprintf(&str, "%llu", (unsigned long long) l->rlim.rlim_max);
+ break;
+ case COL_UNITS:
+ str = l->desc->unit ? xstrdup(_(l->desc->unit)) : NULL;
+ break;
+ default:
+ break;
+ }
+
+ if (str && scols_line_refer_data(line, i, str))
+ err(EXIT_FAILURE, _("failed to add output data"));
+ }
+}
+
+static int column_name_to_id(const char *name, size_t namesz)
+{
+ size_t i;
+
+ assert(name);
+
+ for (i = 0; i < ARRAY_SIZE(infos); i++) {
+ const char *cn = infos[i].name;
+
+ if (!strncasecmp(name, cn, namesz) && !*(cn + namesz))
+ return i;
+ }
+ warnx(_("unknown column: %s"), name);
+ return -1;
+}
+
+static void rem_prlim(struct prlimit *lim)
+{
+ if (!lim)
+ return;
+ list_del(&lim->lims);
+ free(lim);
+}
+
+static int show_limits(struct list_head *lims)
+{
+ int i;
+ struct list_head *p, *pnext;
+ struct libscols_table *table;
+
+ table = scols_new_table();
+ if (!table)
+ err(EXIT_FAILURE, _("failed to allocate output table"));
+
+ scols_table_enable_raw(table, raw);
+ scols_table_enable_noheadings(table, no_headings);
+
+ for (i = 0; i < ncolumns; i++) {
+ struct colinfo *col = get_column_info(i);
+
+ if (!scols_table_new_column(table, col->name, col->whint, col->flags))
+ err(EXIT_FAILURE, _("failed to allocate output column"));
+ }
+
+ list_for_each_safe(p, pnext, lims) {
+ struct prlimit *lim = list_entry(p, struct prlimit, lims);
+
+ add_scols_line(table, lim);
+ rem_prlim(lim);
+ }
+
+ scols_print_table(table);
+ scols_unref_table(table);
+ return 0;
+}
+
+/*
+ * If one of the limits is unknown (default value for not being passed), we
+ * need to get the current limit and use it. I see no other way other than
+ * using prlimit(2).
+ */
+static void get_unknown_hardsoft(struct prlimit *lim)
+{
+ struct rlimit old;
+
+ if (prlimit(pid, lim->desc->resource, NULL, &old) == -1)
+ err(EXIT_FAILURE, _("failed to get old %s limit"),
+ lim->desc->name);
+
+ if (!(lim->modify & PRLIMIT_SOFT))
+ lim->rlim.rlim_cur = old.rlim_cur;
+ else if (!(lim->modify & PRLIMIT_HARD))
+ lim->rlim.rlim_max = old.rlim_max;
+}
+
+static void do_prlimit(struct list_head *lims)
+{
+ struct list_head *p, *pnext;
+
+ list_for_each_safe(p, pnext, lims) {
+ struct rlimit *new = NULL, *old = NULL;
+ struct prlimit *lim = list_entry(p, struct prlimit, lims);
+
+ if (lim->modify) {
+ if (lim->modify != (PRLIMIT_HARD | PRLIMIT_SOFT))
+ get_unknown_hardsoft(lim);
+
+ if ((lim->rlim.rlim_cur > lim->rlim.rlim_max) &&
+ (lim->rlim.rlim_cur != RLIM_INFINITY ||
+ lim->rlim.rlim_max != RLIM_INFINITY))
+ errx(EXIT_FAILURE, _("the soft limit %s cannot exceed the hard limit"),
+ lim->desc->name);
+ new = &lim->rlim;
+ } else
+ old = &lim->rlim;
+
+ if (verbose && new) {
+ printf(_("New %s limit for pid %d: "), lim->desc->name,
+ pid ? pid : getpid());
+ if (new->rlim_cur == RLIM_INFINITY)
+ printf("<%s", _("unlimited"));
+ else
+ printf("<%ju", (uintmax_t)new->rlim_cur);
+
+ if (new->rlim_max == RLIM_INFINITY)
+ printf(":%s>\n", _("unlimited"));
+ else
+ printf(":%ju>\n", (uintmax_t)new->rlim_max);
+ }
+
+ if (prlimit(pid, lim->desc->resource, new, old) == -1)
+ err(EXIT_FAILURE, lim->modify ?
+ _("failed to set the %s resource limit") :
+ _("failed to get the %s resource limit"),
+ lim->desc->name);
+
+ if (lim->modify)
+ rem_prlim(lim); /* modify only; don't show */
+ }
+}
+
+static int get_range(char *str, rlim_t *soft, rlim_t *hard, int *found)
+{
+ char *end = NULL;
+
+ if (!str)
+ return 0;
+
+ *found = errno = 0;
+ *soft = *hard = RLIM_INFINITY;
+
+ if (!strcmp(str, INFINITY_STR)) { /* <unlimited> */
+ *found |= PRLIMIT_SOFT | PRLIMIT_HARD;
+ return 0;
+
+ } else if (*str == ':') { /* <:hard> */
+ str++;
+
+ if (strcmp(str, INFINITY_STR) != 0) {
+ *hard = strtoull(str, &end, 10);
+
+ if (errno || !end || *end || end == str)
+ return -1;
+ }
+ *found |= PRLIMIT_HARD;
+ return 0;
+
+ }
+
+ if (strncmp(str, INFINITY_STR, INFINITY_STRLEN) == 0) {
+ /* <unlimited> or <unlimited:> */
+ end = str + INFINITY_STRLEN;
+ } else {
+ /* <value> or <soft:> */
+ *hard = *soft = strtoull(str, &end, 10);
+ if (errno || !end || end == str)
+ return -1;
+ }
+
+ if (*end == ':' && !*(end + 1)) /* <soft:> */
+ *found |= PRLIMIT_SOFT;
+
+ else if (*end == ':') { /* <soft:hard> */
+ str = end + 1;
+
+ if (!strcmp(str, INFINITY_STR))
+ *hard = RLIM_INFINITY;
+ else {
+ end = NULL;
+ errno = 0;
+ *hard = strtoull(str, &end, 10);
+
+ if (errno || !end || *end || end == str)
+ return -1;
+ }
+ *found |= PRLIMIT_SOFT | PRLIMIT_HARD;
+
+ } else /* <value> */
+ *found |= PRLIMIT_SOFT | PRLIMIT_HARD;
+
+ return 0;
+}
+
+
+static int parse_prlim(struct rlimit *lim, char *ops, size_t id)
+{
+ rlim_t soft, hard;
+ int found = 0;
+
+ if (get_range(ops, &soft, &hard, &found))
+ errx(EXIT_FAILURE, _("failed to parse %s limit"),
+ prlimit_desc[id].name);
+
+ lim->rlim_cur = soft;
+ lim->rlim_max = hard;
+
+ return found;
+}
+
+static int add_prlim(char *ops, struct list_head *lims, size_t id)
+{
+ struct prlimit *lim = xcalloc(1, sizeof(*lim));
+
+ INIT_LIST_HEAD(&lim->lims);
+ lim->desc = &prlimit_desc[id];
+
+ if (ops)
+ lim->modify = parse_prlim(&lim->rlim, ops, id);
+
+ list_add_tail(&lim->lims, lims);
+ return 0;
+}
+
+int main(int argc, char **argv)
+{
+ int opt;
+ struct list_head lims;
+
+ enum {
+ VERBOSE_OPTION = CHAR_MAX + 1,
+ RAW_OPTION,
+ NOHEADINGS_OPTION
+ };
+
+ static const struct option longopts[] = {
+ { "pid", required_argument, NULL, 'p' },
+ { "output", required_argument, NULL, 'o' },
+ { "as", optional_argument, NULL, 'v' },
+ { "core", optional_argument, NULL, 'c' },
+ { "cpu", optional_argument, NULL, 't' },
+ { "data", optional_argument, NULL, 'd' },
+ { "fsize", optional_argument, NULL, 'f' },
+ { "locks", optional_argument, NULL, 'x' },
+ { "memlock", optional_argument, NULL, 'l' },
+ { "msgqueue", optional_argument, NULL, 'q' },
+ { "nice", optional_argument, NULL, 'e' },
+ { "nofile", optional_argument, NULL, 'n' },
+ { "nproc", optional_argument, NULL, 'u' },
+ { "rss", optional_argument, NULL, 'm' },
+ { "rtprio", optional_argument, NULL, 'r' },
+ { "rttime", optional_argument, NULL, 'y' },
+ { "sigpending", optional_argument, NULL, 'i' },
+ { "stack", optional_argument, NULL, 's' },
+ { "version", no_argument, NULL, 'V' },
+ { "help", no_argument, NULL, 'h' },
+ { "noheadings", no_argument, NULL, NOHEADINGS_OPTION },
+ { "raw", no_argument, NULL, RAW_OPTION },
+ { "verbose", no_argument, NULL, VERBOSE_OPTION },
+ { NULL, 0, NULL, 0 }
+ };
+
+ setlocale(LC_ALL, "");
+ bindtextdomain(PACKAGE, LOCALEDIR);
+ textdomain(PACKAGE);
+ atexit(close_stdout);
+
+ INIT_LIST_HEAD(&lims);
+
+ /*
+ * Something is very wrong if this doesn't succeed,
+ * assuming STACK is the last resource, of course.
+ */
+ assert(MAX_RESOURCES == STACK + 1);
+
+ while((opt = getopt_long(argc, argv,
+ "+c::d::e::f::i::l::m::n::q::r::s::t::u::v::x::y::p:o:vVh",
+ longopts, NULL)) != -1) {
+ switch(opt) {
+ case 'c':
+ add_prlim(optarg, &lims, CORE);
+ break;
+ case 'd':
+ add_prlim(optarg, &lims, DATA);
+ break;
+ case 'e':
+ add_prlim(optarg, &lims, NICE);
+ break;
+ case 'f':
+ add_prlim(optarg, &lims, FSIZE);
+ break;
+ case 'i':
+ add_prlim(optarg, &lims, SIGPENDING);
+ break;
+ case 'l':
+ add_prlim(optarg, &lims, MEMLOCK);
+ break;
+ case 'm':
+ add_prlim(optarg, &lims, RSS);
+ break;
+ case 'n':
+ add_prlim(optarg, &lims, NOFILE);
+ break;
+ case 'q':
+ add_prlim(optarg, &lims, MSGQUEUE);
+ break;
+ case 'r':
+ add_prlim(optarg, &lims, RTPRIO);
+ break;
+ case 's':
+ add_prlim(optarg, &lims, STACK);
+ break;
+ case 't':
+ add_prlim(optarg, &lims, CPU);
+ break;
+ case 'u':
+ add_prlim(optarg, &lims, NPROC);
+ break;
+ case 'v':
+ add_prlim(optarg, &lims, AS);
+ break;
+ case 'x':
+ add_prlim(optarg, &lims, LOCKS);
+ break;
+ case 'y':
+ add_prlim(optarg, &lims, RTTIME);
+ break;
+
+ case 'p':
+ if (pid)
+ errx(EXIT_FAILURE, _("option --pid may be specified only once"));
+ pid = strtos32_or_err(optarg, _("invalid PID argument"));
+ break;
+ case 'h':
+ usage();
+ case 'o':
+ ncolumns = string_to_idarray(optarg,
+ columns, ARRAY_SIZE(columns),
+ column_name_to_id);
+ if (ncolumns < 0)
+ return EXIT_FAILURE;
+ break;
+ case 'V':
+ printf(UTIL_LINUX_VERSION);
+ return EXIT_SUCCESS;
+
+ case NOHEADINGS_OPTION:
+ no_headings = 1;
+ break;
+ case VERBOSE_OPTION:
+ verbose++;
+ break;
+ case RAW_OPTION:
+ raw = 1;
+ break;
+ default:
+ errtryhelp(EXIT_FAILURE);
+ }
+ }
+ if (argc > optind && pid)
+ errx(EXIT_FAILURE, _("options --pid and COMMAND are mutually exclusive"));
+ if (!ncolumns) {
+ /* default columns */
+ columns[ncolumns++] = COL_RES;
+ columns[ncolumns++] = COL_HELP;
+ columns[ncolumns++] = COL_SOFT;
+ columns[ncolumns++] = COL_HARD;
+ columns[ncolumns++] = COL_UNITS;
+ }
+
+ scols_init_debug(0);
+
+ if (list_empty(&lims)) {
+ /* default is to print all resources */
+ size_t n;
+
+ for (n = 0; n < MAX_RESOURCES; n++)
+ add_prlim(NULL, &lims, n);
+ }
+
+ do_prlimit(&lims);
+
+ if (!list_empty(&lims))
+ show_limits(&lims);
+
+ if (argc > optind) {
+ /* prlimit [options] COMMAND */
+ execvp(argv[optind], &argv[optind]);
+ errexec(argv[optind]);
+ }
+
+ return EXIT_SUCCESS;
+}
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