diff options
Diffstat (limited to 'sys-utils/choom.c')
| -rw-r--r-- | sys-utils/choom.c | 159 |
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..eff95b6 --- /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); + atexit(close_stdout); + + 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': + printf(UTIL_LINUX_VERSION); + return 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; +} |