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-rw-r--r--sys-utils/choom.c159
1 files changed, 159 insertions, 0 deletions
diff --git a/sys-utils/choom.c b/sys-utils/choom.c
new file mode 100644
index 0000000..b3d3e4d
--- /dev/null
+++ b/sys-utils/choom.c
@@ -0,0 +1,159 @@
+/*
+ * choom - Change OOM score setting
+ *
+ * Copyright (C) 2018 Karel Zak <kzak@redhat.com>
+ *
+ * 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 would 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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <errno.h>
+
+#include "nls.h"
+#include "c.h"
+#include "path.h"
+#include "strutils.h"
+#include "closestream.h"
+
+static void __attribute__((__noreturn__)) usage(void)
+{
+ FILE *out = stdout;
+ fputs(USAGE_HEADER, out);
+ fprintf(out,
+ _(" %1$s [options] -p pid\n"
+ " %1$s [options] -n number -p pid\n"
+ " %1$s [options] -n number [--] command [args...]]\n"),
+ program_invocation_short_name);
+
+ fputs(USAGE_SEPARATOR, out);
+ fputs(_("Display and adjust OOM-killer score.\n"), out);
+
+ fputs(USAGE_OPTIONS, out);
+ fputs(_(" -n, --adjust <num> specify the adjust score value\n"), out);
+ fputs(_(" -p, --pid <num> process ID\n"), out);
+ fputs(USAGE_SEPARATOR, out);
+ printf(USAGE_HELP_OPTIONS(24));
+ printf(USAGE_MAN_TAIL("choom(1)"));
+ exit(EXIT_SUCCESS);
+}
+
+static int get_score(struct path_cxt *pc)
+{
+ int ret;
+
+ if (ul_path_read_s32(pc, &ret, "oom_score") != 0)
+ err(EXIT_FAILURE, _("failed to read OOM score value"));
+
+ return ret;
+}
+
+static int get_score_adj(struct path_cxt *pc)
+{
+ int ret;
+
+ if (ul_path_read_s32(pc, &ret, "oom_score_adj") != 0)
+ err(EXIT_FAILURE, _("failed to read OOM score adjust value"));
+
+ return ret;
+}
+
+static int set_score_adj(struct path_cxt *pc, int adj)
+{
+ return ul_path_write_s64(pc, adj, "oom_score_adj");
+}
+
+int main(int argc, char **argv)
+{
+ pid_t pid = 0;
+ int c, adj = 0, has_adj = 0;
+ struct path_cxt *pc = NULL;
+
+ static const struct option longopts[] = {
+ { "adjust", required_argument, NULL, 'n' },
+ { "pid", required_argument, NULL, 'p' },
+ { "help", no_argument, NULL, 'h' },
+ { "version", no_argument, NULL, 'V' },
+ { NULL, 0, NULL, 0 }
+ };
+
+ setlocale(LC_ALL, "");
+ bindtextdomain(PACKAGE, LOCALEDIR);
+ textdomain(PACKAGE);
+ close_stdout_atexit();
+
+ while ((c = getopt_long(argc, argv, "hn:p:V", longopts, NULL)) != -1) {
+ switch (c) {
+ case 'p':
+ pid = strtos32_or_err(optarg, _("invalid PID argument"));
+ break;
+ case 'n':
+ adj = strtos32_or_err(optarg, _("invalid adjust argument"));
+ has_adj = 1;
+ break;
+
+ case 'V':
+ print_version(EXIT_SUCCESS);
+ case 'h':
+ usage();
+ default:
+ errtryhelp(EXIT_FAILURE);
+ }
+ }
+
+ if (optind < argc && pid) {
+ warnx(_("invalid argument: %s"), argv[optind]);
+ errtryhelp(EXIT_FAILURE);
+ }
+ if (!pid && argc - optind < 1) {
+ warnx(_("no PID or COMMAND specified"));
+ errtryhelp(EXIT_FAILURE);
+ }
+ if (optind < argc && !has_adj) {
+ warnx(_("no OOM score adjust value specified"));
+ errtryhelp(EXIT_FAILURE);
+ }
+
+ pc = ul_new_path("/proc/%d", (int) (pid ? pid : getpid()));
+
+ /* Show */
+ if (!has_adj) {
+ printf(_("pid %d's current OOM score: %d\n"), pid, get_score(pc));
+ printf(_("pid %d's current OOM score adjust value: %d\n"), pid, get_score_adj(pc));
+
+ /* Change */
+ } else if (pid) {
+ int old = get_score_adj(pc);
+
+ if (set_score_adj(pc, adj))
+ err(EXIT_FAILURE, _("failed to set score adjust value"));
+
+ printf(_("pid %d's OOM score adjust value changed from %d to %d\n"), pid, old, adj);
+
+ /* Start new process */
+ } else {
+ if (set_score_adj(pc, adj))
+ err(EXIT_FAILURE, _("failed to set score adjust value"));
+ ul_unref_path(pc);
+ argv += optind;
+ execvp(argv[0], argv);
+ errexec(argv[0]);
+ }
+
+ ul_unref_path(pc);
+ return EXIT_SUCCESS;
+}