summaryrefslogtreecommitdiffstats
path: root/schedutils/ionice.c
diff options
context:
space:
mode:
Diffstat (limited to 'schedutils/ionice.c')
-rw-r--r--schedutils/ionice.c269
1 files changed, 269 insertions, 0 deletions
diff --git a/schedutils/ionice.c b/schedutils/ionice.c
new file mode 100644
index 0000000..8be83df
--- /dev/null
+++ b/schedutils/ionice.c
@@ -0,0 +1,269 @@
+/*
+ * ionice: set or get process io scheduling class and priority
+ *
+ * Copyright (C) 2005 Jens Axboe <jens@axboe.dk>
+ *
+ * Released under the terms of the GNU General Public License version 2
+ *
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <getopt.h>
+#include <unistd.h>
+#ifdef HAVE_SYS_SYSCALL_H
+#include <sys/syscall.h>
+#endif
+#include <ctype.h>
+
+#include "nls.h"
+#include "strutils.h"
+#include "c.h"
+#include "closestream.h"
+
+static int tolerant;
+
+static inline int ioprio_set(int which, int who, int ioprio)
+{
+ return syscall(SYS_ioprio_set, which, who, ioprio);
+}
+
+static inline int ioprio_get(int which, int who)
+{
+ return syscall(SYS_ioprio_get, which, who);
+}
+
+enum {
+ IOPRIO_CLASS_NONE,
+ IOPRIO_CLASS_RT,
+ IOPRIO_CLASS_BE,
+ IOPRIO_CLASS_IDLE,
+};
+
+enum {
+ IOPRIO_WHO_PROCESS = 1,
+ IOPRIO_WHO_PGRP,
+ IOPRIO_WHO_USER,
+};
+
+#define IOPRIO_CLASS_SHIFT (13)
+#define IOPRIO_PRIO_MASK ((1UL << IOPRIO_CLASS_SHIFT) - 1)
+
+#define IOPRIO_PRIO_CLASS(mask) ((mask) >> IOPRIO_CLASS_SHIFT)
+#define IOPRIO_PRIO_DATA(mask) ((mask) & IOPRIO_PRIO_MASK)
+#define IOPRIO_PRIO_VALUE(class, data) (((class) << IOPRIO_CLASS_SHIFT) | data)
+
+static const char *to_prio[] = {
+ [IOPRIO_CLASS_NONE] = "none",
+ [IOPRIO_CLASS_RT] = "realtime",
+ [IOPRIO_CLASS_BE] = "best-effort",
+ [IOPRIO_CLASS_IDLE] = "idle"
+};
+
+static int parse_ioclass(const char *str)
+{
+ size_t i;
+
+ for (i = 0; i < ARRAY_SIZE(to_prio); i++)
+ if (!strcasecmp(str, to_prio[i]))
+ return i;
+ return -1;
+}
+
+static void ioprio_print(int pid, int who)
+{
+ int ioprio = ioprio_get(who, pid);
+
+ if (ioprio == -1)
+ err(EXIT_FAILURE, _("ioprio_get failed"));
+ else {
+ int ioclass = IOPRIO_PRIO_CLASS(ioprio);
+ const char *name = _("unknown");
+
+ if (ioclass >= 0 && (size_t) ioclass < ARRAY_SIZE(to_prio))
+ name = to_prio[ioclass];
+
+ if (ioclass != IOPRIO_CLASS_IDLE)
+ printf(_("%s: prio %lu\n"), name,
+ IOPRIO_PRIO_DATA(ioprio));
+ else
+ printf("%s\n", name);
+ }
+}
+
+static void ioprio_setid(int which, int ioclass, int data, int who)
+{
+ int rc = ioprio_set(who, which,
+ IOPRIO_PRIO_VALUE(ioclass, data));
+
+ if (rc == -1 && !tolerant)
+ err(EXIT_FAILURE, _("ioprio_set failed"));
+}
+
+static void __attribute__((__noreturn__)) usage(void)
+{
+ FILE *out = stdout;
+ fputs(USAGE_HEADER, out);
+ fprintf(out, _(" %1$s [options] -p <pid>...\n"
+ " %1$s [options] -P <pgid>...\n"
+ " %1$s [options] -u <uid>...\n"
+ " %1$s [options] <command>\n"), program_invocation_short_name);
+
+ fputs(USAGE_SEPARATOR, out);
+ fputs(_("Show or change the I/O-scheduling class and priority of a process.\n"), out);
+
+ fputs(USAGE_OPTIONS, out);
+ fputs(_(" -c, --class <class> name or number of scheduling class,\n"
+ " 0: none, 1: realtime, 2: best-effort, 3: idle\n"), out);
+ fputs(_(" -n, --classdata <num> priority (0..7) in the specified scheduling class,\n"
+ " only for the realtime and best-effort classes\n"), out);
+ fputs(_(" -p, --pid <pid>... act on these already running processes\n"), out);
+ fputs(_(" -P, --pgid <pgrp>... act on already running processes in these groups\n"), out);
+ fputs(_(" -t, --ignore ignore failures\n"), out);
+ fputs(_(" -u, --uid <uid>... act on already running processes owned by these users\n"), out);
+
+ fputs(USAGE_SEPARATOR, out);
+ printf(USAGE_HELP_OPTIONS(24));
+
+ printf(USAGE_MAN_TAIL("ionice(1)"));
+
+ exit(EXIT_SUCCESS);
+}
+
+int main(int argc, char **argv)
+{
+ int data = 4, set = 0, ioclass = IOPRIO_CLASS_BE, c;
+ int which = 0, who = 0;
+ const char *invalid_msg = NULL;
+
+ static const struct option longopts[] = {
+ { "classdata", required_argument, NULL, 'n' },
+ { "class", required_argument, NULL, 'c' },
+ { "help", no_argument, NULL, 'h' },
+ { "ignore", no_argument, NULL, 't' },
+ { "pid", required_argument, NULL, 'p' },
+ { "pgid", required_argument, NULL, 'P' },
+ { "uid", required_argument, NULL, 'u' },
+ { "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, "+n:c:p:P:u:tVh", longopts, NULL)) != EOF)
+ switch (c) {
+ case 'n':
+ data = strtos32_or_err(optarg, _("invalid class data argument"));
+ set |= 1;
+ break;
+ case 'c':
+ if (isdigit(*optarg))
+ ioclass = strtos32_or_err(optarg,
+ _("invalid class argument"));
+ else {
+ ioclass = parse_ioclass(optarg);
+ if (ioclass < 0)
+ errx(EXIT_FAILURE,
+ _("unknown scheduling class: '%s'"),
+ optarg);
+ }
+ set |= 2;
+ break;
+ case 'p':
+ if (who)
+ errx(EXIT_FAILURE,
+ _("can handle only one of pid, pgid or uid at once"));
+ invalid_msg = _("invalid PID argument");
+ which = strtos32_or_err(optarg, invalid_msg);
+ who = IOPRIO_WHO_PROCESS;
+ break;
+ case 'P':
+ if (who)
+ errx(EXIT_FAILURE,
+ _("can handle only one of pid, pgid or uid at once"));
+ invalid_msg = _("invalid PGID argument");
+ which = strtos32_or_err(optarg, invalid_msg);
+ who = IOPRIO_WHO_PGRP;
+ break;
+ case 'u':
+ if (who)
+ errx(EXIT_FAILURE,
+ _("can handle only one of pid, pgid or uid at once"));
+ invalid_msg = _("invalid UID argument");
+ which = strtos32_or_err(optarg, invalid_msg);
+ who = IOPRIO_WHO_USER;
+ break;
+ case 't':
+ tolerant = 1;
+ break;
+
+ case 'V':
+ print_version(EXIT_SUCCESS);
+ case 'h':
+ usage();
+ default:
+ errtryhelp(EXIT_FAILURE);
+ }
+
+ switch (ioclass) {
+ case IOPRIO_CLASS_NONE:
+ if ((set & 1) && !tolerant)
+ warnx(_("ignoring given class data for none class"));
+ data = 0;
+ break;
+ case IOPRIO_CLASS_RT:
+ case IOPRIO_CLASS_BE:
+ break;
+ case IOPRIO_CLASS_IDLE:
+ if ((set & 1) && !tolerant)
+ warnx(_("ignoring given class data for idle class"));
+ data = 7;
+ break;
+ default:
+ if (!tolerant)
+ warnx(_("unknown prio class %d"), ioclass);
+ break;
+ }
+
+ if (!set && !which && optind == argc)
+ /*
+ * ionice without options, print the current ioprio
+ */
+ ioprio_print(0, IOPRIO_WHO_PROCESS);
+ else if (!set && who) {
+ /*
+ * ionice -p|-P|-u ID [ID ...]
+ */
+ ioprio_print(which, who);
+
+ for(; argv[optind]; ++optind) {
+ which = strtos32_or_err(argv[optind], invalid_msg);
+ ioprio_print(which, who);
+ }
+ } else if (set && who) {
+ /*
+ * ionice -c CLASS -p|-P|-u ID [ID ...]
+ */
+ ioprio_setid(which, ioclass, data, who);
+
+ for(; argv[optind]; ++optind) {
+ which = strtos32_or_err(argv[optind], invalid_msg);
+ ioprio_setid(which, ioclass, data, who);
+ }
+ } else if (argv[optind]) {
+ /*
+ * ionice [-c CLASS] COMMAND
+ */
+ ioprio_setid(0, ioclass, data, IOPRIO_WHO_PROCESS);
+ execvp(argv[optind], &argv[optind]);
+ errexec(argv[optind]);
+ } else {
+ warnx(_("bad usage"));
+ errtryhelp(EXIT_FAILURE);
+ }
+
+ return EXIT_SUCCESS;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-19 09:08:17 +0000