Manuel Novoa III <mjn3@codepoet.org>
cat, head, mkfifo, mknod, rmdir, sleep, tee, tty, uniq, usleep, wc, yes,
- mesg, vconfig, make_directory, parse_mode, dirname, mode_string,
+ mesg, vconfig, nice, renice,
+ make_directory, parse_mode, dirname, mode_string,
get_last_path_component, simplify_path, and a number trivial libbb routines
also bug fixes, partial rewrites, and size optimizations in
help
mv is used to move or rename files or directories.
+config CONFIG_NICE
+ bool "nice"
+ default n
+ help
+ nice runs a program with modified scheduling priority.
+
config CONFIG_OD
bool "od"
default n
COREUTILS-$(CONFIG_MKFIFO) += mkfifo.o
COREUTILS-$(CONFIG_MKNOD) += mknod.o
COREUTILS-$(CONFIG_MV) += mv.o
+COREUTILS-$(CONFIG_NICE) += nice.o
COREUTILS-$(CONFIG_OD) += od.o
COREUTILS-$(CONFIG_PRINTF) += printf.o
COREUTILS-$(CONFIG_PWD) += pwd.o
--- /dev/null
+/* vi: set sw=4 ts=4: */
+/*
+ * nice implementation for busybox
+ *
+ * Copyright (C) 2005 Manuel Novoa III <mjn3@codepoet.org>
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#include <errno.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include "busybox.h"
+
+static inline int int_add_no_wrap(int a, int b)
+{
+ int s = a + b;
+
+ if (b < 0) {
+ if (s > a) s = INT_MIN;
+ } else {
+ if (s < a) s = INT_MAX;
+ }
+
+ return s;
+}
+
+int nice_main(int argc, char **argv)
+{
+ static const char Xetpriority_msg[] = "cannot %cet priority";
+
+ int old_priority, adjustment;
+
+ errno = 0; /* Needed for getpriority error detection. */
+ old_priority = getpriority(PRIO_PROCESS, 0);
+ if (errno) {
+ bb_perror_msg_and_die(Xetpriority_msg, 'g');
+ }
+
+ if (!*++argv) { /* No args, so (GNU) output current nice value. */
+ bb_printf("%d\n", old_priority);
+ bb_fflush_stdout_and_exit(EXIT_SUCCESS);
+ }
+
+ adjustment = 10; /* Set default adjustment. */
+
+ if ((argv[0][0] == '-') && (argv[0][1] == 'n') && !argv[0][2]) { /* "-n" */
+ if (argc < 4) { /* Missing priority and/or utility! */
+ bb_show_usage();
+ }
+ adjustment = bb_xgetlarg(argv[1], 10, INT_MIN, INT_MAX);
+ argv += 2;
+ }
+
+ { /* Set our priority. Handle integer wrapping for old + adjust. */
+ int new_priority = int_add_no_wrap(old_priority, adjustment);
+
+ if (setpriority(PRIO_PROCESS, 0, new_priority) < 0) {
+ bb_perror_msg_and_die(Xetpriority_msg, 's');
+ }
+ }
+
+ execvp(*argv, argv); /* Now exec the desired program. */
+
+ /* The exec failed... */
+ bb_default_error_retval = (errno == ENOENT) ? 127 : 126; /* SUSv3 */
+ bb_perror_msg_and_die("%s", *argv);
+}
#ifdef CONFIG_NETSTAT
APPLET(netstat, netstat_main, _BB_DIR_BIN, _BB_SUID_NEVER)
#endif
+#ifdef CONFIG_NICE
+ APPLET(nice, nice_main, _BB_DIR_BIN, _BB_SUID_NEVER)
+#endif
#ifdef CONFIG_NSLOOKUP
APPLET(nslookup, nslookup_main, _BB_DIR_USR_BIN, _BB_SUID_NEVER)
#endif
"\t-w raw sockets\n" \
"\t-x unix sockets"
+#define nice_trivial_usage \
+ "[-n ADJUST] [COMMAND [ARG] ...]"
+#define nice_full_usage \
+ "Nice runs a program with modified scheduling priority.\n\n" \
+ "Options:\n" \
+ "\t-n ADJUST\tAdjust the scheduling priority by ADJUST.\n" \
+
#define nslookup_trivial_usage \
"[HOST] [SERVER]"
#define nslookup_full_usage \
"\t-d\t\tdelay interval for rebooting."
#define renice_trivial_usage \
- "priority pid [pid ...]"
+ "{{-n INCREMENT} | PRIORITY} [[ -p | -g | -u ] ID ...]"
#define renice_full_usage \
- "Changes priority of running processes. Allowed priorities range\n" \
- "from 20 (the process runs only when nothing else is running) to 0\n" \
- "(default priority) to -20 (almost nothing else ever gets to run)."
+ "Changes priority of running processes.\n\n" \
+ "Options:\n" \
+ "\t-n\tadjusts current nice value (smaller is faster)\n" \
+ "\t-p\tprocess id(s) (default)\n" \
+ "\t-g\tprocess group id(s)\n" \
+ "\t-u\tprocess user name(s) and/or id(s)"
#define reset_trivial_usage \
""
+/* vi: set sw=4 ts=4: */
/*
- * Mini renice implementation for busybox
+ * renice implementation for busybox
*
- *
- * Copyright (C) 2000 Dave 'Kill a Cop' Cinege <dcinege@psychosis.com>
+ * Copyright (C) 2005 Manuel Novoa III <mjn3@codepoet.org>
*
* 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
*
*/
+/* Notes:
+ * Setting an absolute priority was obsoleted in SUSv2 and removed
+ * in SUSv3. However, the common linux version of renice does
+ * absolute and not relative. So we'll continue supporting absolute,
+ * although the stdout logging has been removed since both SUSv2 and
+ * SUSv3 specify that stdout isn't used.
+ *
+ * This version is lenient in that it doesn't require any IDs. The
+ * options -p, -g, and -u are treated as mode switches for the
+ * following IDs (if any). Multiple switches are allowed.
+ */
+
#include <stdio.h>
-#include <errno.h>
#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#include <errno.h>
+#include <unistd.h>
#include <sys/time.h>
#include <sys/resource.h>
#include "busybox.h"
+#if (PRIO_PROCESS < CHAR_MIN) || (PRIO_PROCESS > CHAR_MAX)
+#error Assumption violated : PRIO_PROCESS value
+#endif
+#if (PRIO_PGRP < CHAR_MIN) || (PRIO_PGRP > CHAR_MAX)
+#error Assumption violated : PRIO_PGRP value
+#endif
+#if (PRIO_USER < CHAR_MIN) || (PRIO_USER > CHAR_MAX)
+#error Assumption violated : PRIO_USER value
+#endif
+
+static inline int int_add_no_wrap(int a, int b)
+{
+ int s = a + b;
+
+ if (b < 0) {
+ if (s > a) s = INT_MIN;
+ } else {
+ if (s < a) s = INT_MAX;
+ }
-extern int renice_main(int argc, char **argv)
+ return s;
+}
+
+int renice_main(int argc, char **argv)
{
- int prio, status = EXIT_SUCCESS;
+ static const char Xetpriority_msg[] = "%d : %cetpriority";
+
+ int retval = EXIT_SUCCESS;
+ int which = PRIO_PROCESS; /* Default 'which' value. */
+ int use_relative = 0;
+ int adjustment, new_priority;
+ id_t who;
- if (argc < 3) bb_show_usage();
+ ++argv;
- prio = atoi(*++argv);
- if (prio > 20) prio = 20;
- if (prio < -20) prio = -20;
+ /* Check if we are using a relative adjustment. */
+ if (argv[0] && (argv[0][0] == '-') && (argv[0][1] == 'n') && !argv[0][2]) {
+ use_relative = 1;
+ ++argv;
+ }
+
+ if (!*argv) { /* No args? Then show usage. */
+ bb_show_usage();
+ }
+
+ /* Get the priority adjustment (absolute or relative). */
+ adjustment = bb_xgetlarg(*argv, 10, INT_MIN, INT_MAX);
while (*++argv) {
- int ps = atoi(*argv);
- int oldp = getpriority(PRIO_PROCESS, ps);
+ /* Check for a mode switch. */
+ if ((argv[0][0] == '-') && argv[0][1] && !argv[0][2]) {
+ static const char opts[]
+ = { 'p', 'g', 'u', 0, PRIO_PROCESS, PRIO_PGRP, PRIO_USER };
+ const char *p;
+ if ((p = strchr(opts, argv[0][1]))) {
+ which = p[4];
+ continue;
+ }
+ }
- if (setpriority(PRIO_PROCESS, ps, prio) == 0) {
- printf("%d: old priority %d, new priority %d\n", ps, oldp, prio );
+ /* Process an ID arg. */
+ if (which == PRIO_USER) {
+ struct passwd *p;
+ if (!(p = getpwnam(*argv))) {
+ bb_error_msg("unknown user: %s", *argv);
+ goto HAD_ERROR;
+ }
+ who = p->pw_uid;
} else {
- bb_perror_msg("%d: setpriority", ps);
- status = EXIT_FAILURE;
+ char *e;
+ errno = 0;
+ who = strtoul(*argv, &e, 10);
+ if (*e || (*argv == e) || errno) {
+ bb_error_msg("bad value: %s", *argv);
+ goto HAD_ERROR;
+ }
}
+
+ /* Get priority to use, and set it. */
+ if (use_relative) {
+ int old_priority;
+
+ errno = 0; /* Needed for getpriority error detection. */
+ old_priority = getpriority(which, who);
+ if (errno) {
+ bb_perror_msg(Xetpriority_msg, who, 'g');
+ goto HAD_ERROR;
+ }
+
+ new_priority = int_add_no_wrap(old_priority, adjustment);
+ } else {
+ new_priority = adjustment;
+ }
+
+ if (setpriority(which, who, new_priority) == 0) {
+ continue;
+ }
+
+ bb_perror_msg(Xetpriority_msg, who, 's');
+ HAD_ERROR:
+ retval = EXIT_FAILURE;
}
- return status;
+ /* No need to check for errors outputing to stderr since, if it
+ * was used, the HAD_ERROR label was reached and retval was set. */
+
+ return retval;
}
projects / platform / upstream / busybox.git / commitdiff