ionice: new applet, adapted from Linux kernel' example by Walter Harms
text data bss dec hex filename
1050316 924 10952 1062192 103530 busybox_old
1050758 924 10952 1062634 1036ea busybox_unstripped
diff --git a/miscutils/Config.in b/miscutils/Config.in
index 68732e6..94174de 100644
--- a/miscutils/Config.in
+++ b/miscutils/Config.in
@@ -238,6 +238,13 @@
"NN" (ASCII decimal number) - percentage to show on progress bar
"exit" - well you guessed it
+config IONICE
+ bool "ionice"
+ default n
+ help
+ Set/set program io scheduling class and priority
+ Requires kernel >= 2.6.13
+
config INOTIFYD
bool "inotifyd"
default n
diff --git a/miscutils/Kbuild b/miscutils/Kbuild
index e6e4347..7665130 100644
--- a/miscutils/Kbuild
+++ b/miscutils/Kbuild
@@ -16,6 +16,7 @@
lib-$(CONFIG_DEVMEM) += devmem.o
lib-$(CONFIG_EJECT) += eject.o
lib-$(CONFIG_FBSPLASH) += fbsplash.o
+lib-$(CONFIG_IONICE) += ionice.o
lib-$(CONFIG_HDPARM) += hdparm.o
lib-$(CONFIG_INOTIFYD) += inotifyd.o
lib-$(CONFIG_FEATURE_LAST_SMALL)+= last.o
diff --git a/miscutils/ionice.c b/miscutils/ionice.c
new file mode 100644
index 0000000..88d771c
--- /dev/null
+++ b/miscutils/ionice.c
@@ -0,0 +1,99 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * ionice implementation for busybox based on linux-utils-ng 2.14
+ *
+ * Copyright (C) 2008 by <u173034@informatik.uni-oldenburg.de>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include <sys/syscall.h>
+#include <asm/unistd.h>
+#include "libbb.h"
+
+static int ioprio_set(int which, int who, int ioprio)
+{
+ return syscall(SYS_ioprio_set, which, who, ioprio);
+}
+
+static int ioprio_get(int which, int who)
+{
+ return syscall(SYS_ioprio_get, which, who);
+}
+
+enum {
+ IOPRIO_WHO_PROCESS = 1,
+ IOPRIO_WHO_PGRP,
+ IOPRIO_WHO_USER
+};
+
+enum {
+ IOPRIO_CLASS_NONE,
+ IOPRIO_CLASS_RT,
+ IOPRIO_CLASS_BE,
+ IOPRIO_CLASS_IDLE
+};
+
+static const char to_prio[] = "none\0realtime\0best-effort\0idle";
+
+#define IOPRIO_CLASS_SHIFT 13
+
+int ionice_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int ionice_main(int argc UNUSED_PARAM, char **argv)
+{
+ /* Defaults */
+ int ioclass = 0;
+ int pri = 0;
+ int pid = 0; /* affect own porcess */
+ int opt;
+ enum {
+ OPT_n = 1,
+ OPT_c = 2,
+ OPT_p = 4,
+ };
+
+ /* Numeric params */
+ opt_complementary = "n+:c+:p+";
+ /* '+': stop at first non-option */
+ opt = getopt32(argv, "+n:c:p:", &pri, &ioclass, &pid);
+ argv += optind;
+
+ if (opt & OPT_c) {
+ if (ioclass > 3)
+ bb_error_msg_and_die("bad class %d", ioclass);
+// Do we need this (compat?)?
+// if (ioclass == IOPRIO_CLASS_NONE)
+// ioclass = IOPRIO_CLASS_BE;
+// if (ioclass == IOPRIO_CLASS_IDLE) {
+// //if (opt & OPT_n)
+// // bb_error_msg("ignoring priority for idle class");
+// pri = 7;
+// }
+ }
+
+ if (!(opt & (OPT_n|OPT_c))) {
+ if (!(opt & OPT_p) && *argv)
+ pid = xatoi_u(*argv);
+
+ pri = ioprio_get(IOPRIO_WHO_PROCESS, pid);
+ if (pri == -1)
+ bb_perror_msg_and_die("ioprio_%cet", 'g');
+
+ ioclass = (pri >> IOPRIO_CLASS_SHIFT) & 0x3;
+ pri &= 0xff;
+ printf((ioclass == IOPRIO_CLASS_IDLE) ? "%s\n" : "%s: prio %d\n",
+ nth_string(to_prio, ioclass), pri);
+ } else {
+//printf("pri=%d class=%d val=%x\n",
+//pri, ioclass, pri | (ioclass << IOPRIO_CLASS_SHIFT));
+ pri |= (ioclass << IOPRIO_CLASS_SHIFT);
+ if (ioprio_set(IOPRIO_WHO_PROCESS, pid, pri) == -1)
+ bb_perror_msg_and_die("ioprio_%cet", 's');
+ if (*argv) {
+ BB_EXECVP(*argv, argv);
+ bb_simple_perror_msg_and_die(*argv);
+ }
+ }
+
+ return EXIT_SUCCESS;
+}