From: Davidlohr Bueso <dave@xxxxxxx>
This program uses the prlimit() system call to get and/or set resource limits for a given process.
Signed-off-by: Davidlohr Bueso <dave@xxxxxxx>
---
sys-utils/prlimit.c | 454 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 454 insertions(+), 0 deletions(-)
create mode 100644 sys-utils/prlimit.c
diff --git a/sys-utils/prlimit.c b/sys-utils/prlimit.c
new file mode 100644
index 0000000..33b47a4
--- /dev/null
+++ b/sys-utils/prlimit.c
@@ -0,0 +1,454 @@
+/*
+ * prlimit - get/set process resource limits.
+ *
+ * Copyright (C) 2011 Davidlohr Bueso <dave@xxxxxxx>
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, 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 "c.h"
+#include "nls.h"
+#include "tt.h"
+#include "xalloc.h"
+#include "strutils.h"
+
+struct prlimit {
+ char *name;
+ char *help;
+ int modify; /* are we changing the limit? */
+ int resource; /* RLIMIT_* id */
+ struct rlimit rlim; /* soft,hard limits */
+} default_lims[] = { /* when no --{resource_name} is passed */
+ {"AS", "address space limit", 0, RLIMIT_AS, {0, 0}},
+ {"CORE", "max core file size", 0, RLIMIT_CORE, {0, 0}},
+ {"CPU", "CPU time in secs", 0, RLIMIT_CPU, {0, 0}},
+ {"DATA", "max data size", 0, RLIMIT_DATA, {0, 0}},
+ {"FSIZE", "max file size", 0, RLIMIT_FSIZE, {0, 0}},
+ {"LOCKS", "max amount of file locks held", 0, RLIMIT_LOCKS, {0, 0}},
+ {"MEMLOCK", "max locked-in-memory address space", 0, RLIMIT_MEMLOCK, {0, 0}},
+ {"MSGQUEUE", "max bytes in POSIX mqueues", 0, RLIMIT_MSGQUEUE, {0, 0}},
+ {"NICE", "max nice prio allowed to raise", 0, RLIMIT_NICE, {0, 0}},
+ {"NOFILE", "max amount of open files", 0, RLIMIT_NOFILE, {0, 0}},
+ {"NPROC", "max number of processes", 0, RLIMIT_NPROC, {0, 0}},
+ {"RSS", "max resident set size", 0, RLIMIT_RSS, {0, 0}},
+ {"RTPRIO", "max real-time priority", 0, RLIMIT_RTPRIO, {0, 0}},
+ {"RTTIME", "timeout for real-time tasks", 0, RLIMIT_RTTIME, {0, 0}},
+ {"SIGPENDING", "max amount of pending signals", 0, RLIMIT_SIGPENDING, {0, 0}},
+ {"STACK", "max stack size", 0, RLIMIT_STACK, {0, 0}}
+};
+
+#define MAX_RESOURCES ARRAY_SIZE(default_lims)
+
+/* to reuse data, maintain the same order used in default_lims[] */
+enum {
+ AS,
+ CORE,
+ CPU,
+ DATA,
+ FSIZE,
+ LOCKS,
+ MEMLOCK,
+ MSGQUEUE,
+ NICE,
+ NOFILE,
+ NPROC,
+ RSS,
+ RTPRIO,
+ RTTIME,
+ SIGPENDING,
+ STACK
+};
+
+enum {
+ COL_HELP,
+ COL_RES,
+ COL_SOFT,
+ COL_HARD,
+ __NCOLUMNS
+};
+
+/* column names */
+struct colinfo {
+ const char *name; /* header */
+ double whint; /* width hint (N < 1 is in percent of termwidth) */
+ int flags; /* TT_FL_* */
+ const char *help;
+};
+
+/* columns descriptions */
+struct colinfo infos[__NCOLUMNS] = {
+ [COL_RES] = { "RESOURCE", 0.25, TT_FL_RIGHT, N_("resource name") },
+ [COL_HELP] = { "DESCRIPTION", 0.1, TT_FL_TRUNC, N_("resource description")},
+ [COL_SOFT] = { "SOFT", 0.1, TT_FL_TRUNC, N_("soft limit")},
+ [COL_HARD] = { "HARD", 1, TT_FL_RIGHT, N_("hard limit (ceiling)")},
+};
+
+/* array with IDs of enabled columns */
+static int columns[__NCOLUMNS], ncolumns;
+
+static void __attribute__ ((__noreturn__)) usage(FILE * out)
+{
+ size_t i;
+
+ fputs(_("\nUsage:\n"), out);
+ fprintf(out,
+ _(" %s [options]\n"), program_invocation_short_name);
+
+ fputs(_("\nGeneral Options:\n"), out);
+ fputs(_(" -p, --pid <pid> process id\n"
+ " -o, --output <type> define which output columns to use\n"
+ " -h, --help display this help and exit\n"
+ " -V, --version output version information and exit\n"), out);
+
+ fputs(_("\nResources Options:\n"), out);
+ fputs(_(" -a, --as address space limit\n"
+ " -c, --core max core file size\n"
+ " -C, --cpu CPU time in secs\n"
+ " -d, --data max data size\n"
+ " -f, --fsize max file size\n"
+ " -l, --locks max amount of file locks held\n"
+ " -m, --memlock max locked-in-memory address space\n"
+ " -M, --msgqueue max bytes in POSIX mqueues\n"
+ " -n, --nice max nice priority allowed to raise\n"
+ " -N, --nofile max amount of open files\n"
+ " -P, --nproc max number of processes\n"
+ " -r, --rss max resident set size\n"
+ " -R, --rtprio max real-time priority\n"
+ " -t, --rttime timeout for real-time teasks\n"
+ " -s, --sigpending max amount of pending signals\n"
+ " -S, --stack max stack size\n"), out);
+
+ fputs(_("\nAvailable columns (for --output):\n"), out);
+
+ for (i = 0; i < __NCOLUMNS; i++)
+ fprintf(out, " %11s %s\n", infos[i].name, _(infos[i].help));
+
+
+ fprintf(out, _("\nFor more information see prlimit(1).\n\n"));
+
+ exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
+}
+
+static inline int get_column_id(int num)
+{
+ assert(ARRAY_SIZE(columns) == __NCOLUMNS);
+ assert(num < ncolumns);
+ assert(columns[num] < __NCOLUMNS);
+
+ return columns[num];
+}
+
+static inline struct colinfo *get_column_info(int num)
+{
+ return &infos[ get_column_id(num) ];
+}
+
+static void add_tt_line(struct tt *tt, struct prlimit l)
+{
+ int i;
+ struct tt_line *line;
+
+ assert(tt);
+ assert(&l);
+
+ line = tt_add_line(tt, NULL);
+ if (!line) {
+ warn(_("failed to add line to output"));
+ return;
+ }
+
+ for (i = 0; i < ncolumns; i++) {
+ char *str = NULL;
+ int rc = 0;
+
+ switch (get_column_id(i)) {
+ case COL_RES:
+ rc = asprintf(&str, "%s", l.name);
+ break;
+ case COL_HELP:
+ rc = asprintf(&str, "%s", l.help);
+ break;
+ case COL_SOFT:
+ rc = l.rlim.rlim_cur == -1 ? asprintf(&str, "%s", "unlimited") :
+ asprintf(&str, "%lld", l.rlim.rlim_cur);
+ break;
+ case COL_HARD:
+ rc = l.rlim.rlim_max == -1 ? asprintf(&str, "%s", "unlimited") :
+ asprintf(&str, "%lld", l.rlim.rlim_max);
+ break;
+ default:
+ break;
+ }
+
+ if (rc || str)
+ tt_line_set_data(line, i, str);
+ }
+}
+
+static int column_name_to_id(const char *name, size_t namesz)
+{
+ int i;
+
+ assert(name);
+
+ for (i = 0; i < __NCOLUMNS; i++) {
+ const char *cn = infos[i].name;
+
+ if (!strncasecmp(name, cn, namesz) && !*(cn + namesz))
+ return i;
+ }
+ warnx(_("unknown column: %s"), name);
+ return -1;
+}
+
+static int show_limits(struct prlimit lims[], int tt_flags, int n)
+{
+ int i;
+ struct tt *tt;
+
+ tt = tt_new_table(tt_flags);
+ if (!tt) {
+ warn(_("failed to initialize output table"));
+ return -1;
+ }
+
+ for (i = 0; i < ncolumns; i++) {
+ struct colinfo *col = get_column_info(i);
+
+ if (!tt_define_column(tt, col->name, col->whint, col->flags)) {
+ warnx(_("failed to initialize output column"));
+ goto done;
+ }
+ }
+
+ for (i = 0; i < n; i++)
+ if (!lims[i].modify) /* only display old limits */
+ add_tt_line(tt, lims[i]);
+
+ tt_print_table(tt);
+done:
+ tt_free_table(tt);
+ return 0;
+}
+
+/*
+ * Obtain the soft and hard limits, from arguments in the form <soft>:<hard>
+ */
+static int parse_prlim(pid_t pid, struct rlimit *lim, int res, const char *ops, const char *errmsg)
+{
+ int soft, hard;
+
+ if (parse_range(ops, &soft, &hard, -3))
+ errx(EXIT_FAILURE, "%s", errmsg);
+
+ /*
+ * If one of the limits is -3 (default value for not being passed), we need
+ * to get the current limit and use it.
+ */
+ if (soft == -3 || hard == -3) {
+ struct rlimit old;
+
+ if (prlimit(pid, res, NULL, &old) == -1)
+ errx(EXIT_FAILURE, _("failed to get old limit"));
+
+ if (soft == -3)
+ soft = old.rlim_cur;
+ else if (hard == -3)
+ hard = old.rlim_max;
+ }
+
+ if (soft > hard)
+ errx(EXIT_FAILURE, _("the soft limit cannot exceed the ceiling value"));
+
+ lim->rlim_cur = (rlim_t) soft;
+ lim->rlim_max = (rlim_t) hard;
+
+ return 0;
+}
+
+static void do_prlimit(pid_t pid, struct prlimit lims[], const int n)
+{
+ int i;
+ struct rlimit *new;
+
+ for (i = 0; i < n; i++) {
+ new = lims[i].modify ? &lims[i].rlim : NULL;
+
+ if (prlimit(pid, lims[i].resource, new, &lims[i].rlim) == -1)
+ err(EXIT_FAILURE, _("failed to get resource limits for PID %d"), pid);
+ }
+
+ show_limits(lims, 0, n);
+}
+
+/*
+ * Add a resource limit to the limits array
+ */
+static int add_prlimit(pid_t pid, struct prlimit lims[], const char *ops,
+ int n, int id, const char *errmsg)
+{
+ /* setup basic data */
+ lims[n].name = default_lims[id].name;
+ lims[n].help = default_lims[id].help;
+ lims[n].resource = default_lims[id].resource;
+
+ if (ops) { /* planning on modifying a limit? */
+ lims[n].modify = 1;
+ parse_prlim(pid, &lims[n].rlim, lims[n].resource, ops, errmsg);
+ } else
+ lims[n].modify = 0;
+
+ return 0;
+}
+
+int main(int argc, char **argv)
+{
+ int opt, n = 0;
+ pid_t pid = 0; /* calling process (default) */
+ struct prlimit lims[MAX_RESOURCES];
+ static const struct option longopts[] = {
+ {"pid", required_argument, NULL, 'p'},
+ {"output", required_argument, NULL, 'o'},
+ {"as", optional_argument, NULL, 'a'},
+ {"core", optional_argument, NULL, 'c'},
+ {"cpu", optional_argument, NULL, 'C'},
+ {"data", optional_argument, NULL, 'd'},
+ {"fsize", optional_argument, NULL, 'f'},
+ {"locks", optional_argument, NULL, 'l'},
+ {"memlock", optional_argument, NULL, 'm'},
+ {"msgqueue", optional_argument, NULL, 'M'},
+ {"nice", optional_argument, NULL, 'n'},
+ {"nofile", optional_argument, NULL, 'N'},
+ {"nproc", optional_argument, NULL, 'P'},
+ {"rss", optional_argument, NULL, 'r'},
+ {"rtprio", optional_argument, NULL, 'R'},
+ {"rttime", optional_argument, NULL, 't'},
+ {"sigpending", optional_argument, NULL, 's'},
+ {"stack", optional_argument, NULL, 'S'},
+ {"version", no_argument, NULL, 'V'},
+ {"help", no_argument, NULL, 'h'},
+ {NULL, 0, NULL, 0}
+ };
+
+ setlocale(LC_ALL, "");
+ bindtextdomain(PACKAGE, LOCALEDIR);
+ textdomain(PACKAGE);
+
+ memset(lims, 0, sizeof(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,
+ "a::c::C::d::f::l::m::M::n::N::P::r::R::t::s::S::p:o:vVh",
+ longopts, NULL)) != -1) {
+ switch(opt) {
+ case 'p':
+ pid = strtol_or_err(optarg, _("cannot parse PID"));
+ break;
+ case 'a':
+ add_prlimit(pid, lims, optarg, n++, AS, "failed to parse AS limit");
+ break;
+ case 'c':
+ add_prlimit(pid, lims, optarg, n++, CORE, "failed to parse CORE limit");
+ break;
+ case 'C':
+ add_prlimit(pid, lims, optarg, n++, CPU, "failed to parse CPU limit");
+ break;
+ case 'd':
+ add_prlimit(pid, lims, optarg, n++, DATA, "failed to parse DATA limit");
+ break;
+ case 'f':
+ add_prlimit(pid, lims, optarg, n++, FSIZE, "failed to parse FSIZE limit");
+ break;
+ case 'l':
+ add_prlimit(pid, lims, optarg, n++, LOCKS, "failed to parse LOCKS limit");
+ break;
+ case 'm':
+ add_prlimit(pid, lims, optarg, n++, MEMLOCK, "failed to parse MEMLOCK limit");
+ break;
+ case 'M':
+ add_prlimit(pid, lims, optarg, n++, MSGQUEUE, "failed to parse MSGQUEUE limit");
+ break;
+ case 'n':
+ add_prlimit(pid, lims, optarg, n++, NICE, "failed to parse NICE limit");
+ break;
+ case 'N':
+ add_prlimit(pid, lims, optarg, n++, NOFILE, "failed to parse NOFILE limit");
+ break;
+ case 'P':
+ add_prlimit(pid, lims, optarg, n++, NPROC, "failed to parse NPROC limit");
+ break;
+ case 'r':
+ add_prlimit(pid, lims, optarg, n++, RSS, "failed to parse RSS limit");
+ break;
+ case 'R':
+ add_prlimit(pid, lims, optarg, n++, RTPRIO, "failed to parse RTPRIO limit");
+ break;
+ case 't':
+ add_prlimit(pid, lims, optarg, n++, RTTIME, "failed to parse RTTIME limit");
+ break;
+ case 's':
+ add_prlimit(pid, lims, optarg, n++, SIGPENDING, "failed to parse SIGPENDING limit");
+ break;
+ case 'S':
+ add_prlimit(pid, lims, optarg, n++, STACK, "failed to parse STACK limit");
+ break;
+ case 'h':
+ usage(stdout);
+ break;
+ 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;
+ default:
+ usage(stderr);
+ break;
+ }
+ }
+
+ if (argc == 1)
+ usage(stderr);
+
+ if (!ncolumns) {
+ columns[ncolumns++] = COL_RES;
+ columns[ncolumns++] = COL_HELP;
+ columns[ncolumns++] = COL_SOFT;
+ columns[ncolumns++] = COL_HARD;
+ }
+
+ n == 0 ? do_prlimit(pid, default_lims, MAX_RESOURCES) :
+ do_prlimit(pid, lims, n);
+
+ return EXIT_SUCCESS;
+}
--
1.7.7
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