*
* 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
- *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
/* Notes:
* following IDs (if any). Multiple switches are allowed.
*/
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <limits.h>
-#include <errno.h>
-#include <unistd.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;
+//usage:#define renice_trivial_usage
+//usage: "{{-n INCREMENT} | PRIORITY} [[-p | -g | -u] ID...]"
+//usage:#define renice_full_usage "\n\n"
+//usage: "Change scheduling priority for a running process\n"
+//usage: "\n -n Adjust current nice value (smaller is faster)"
+//usage: "\n -p Process id(s) (default)"
+//usage: "\n -g Process group id(s)"
+//usage: "\n -u Process user name(s) and/or id(s)"
- if (b < 0) {
- if (s > a) s = INT_MIN;
- } else {
- if (s < a) s = INT_MAX;
- }
+#include "libbb.h"
+#include <sys/resource.h>
- return s;
-}
+void BUG_bad_PRIO_PROCESS(void);
+void BUG_bad_PRIO_PGRP(void);
+void BUG_bad_PRIO_USER(void);
-int renice_main(int argc, char **argv)
+int renice_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int renice_main(int argc UNUSED_PARAM, char **argv)
{
- static const char Xetpriority_msg[] = "%d : %cetpriority";
+ static const char Xetpriority_msg[] ALIGN1 = "%cetpriority";
int retval = EXIT_SUCCESS;
- int which = PRIO_PROCESS; /* Default 'which' value. */
+ int which = PRIO_PROCESS; /* Default 'which' value. */
int use_relative = 0;
int adjustment, new_priority;
- id_t who;
+ unsigned who;
+ char *arg;
- ++argv;
+ /* Yes, they are not #defines in glibc 2.4! #if won't work */
+ if (PRIO_PROCESS < CHAR_MIN || PRIO_PROCESS > CHAR_MAX)
+ BUG_bad_PRIO_PROCESS();
+ if (PRIO_PGRP < CHAR_MIN || PRIO_PGRP > CHAR_MAX)
+ BUG_bad_PRIO_PGRP();
+ if (PRIO_USER < CHAR_MIN || PRIO_USER > CHAR_MAX)
+ BUG_bad_PRIO_USER();
+
+ arg = *++argv;
/* Check if we are using a relative adjustment. */
- if (argv[0] && (argv[0][0] == '-') && (argv[0][1] == 'n') && !argv[0][2]) {
+ if (arg && arg[0] == '-' && arg[1] == 'n') {
use_relative = 1;
- ++argv;
+ if (!arg[2])
+ arg = *++argv;
+ else
+ arg += 2;
}
- if (!*argv) { /* No args? Then show usage. */
+ if (!arg) { /* No args? Then show usage. */
bb_show_usage();
}
/* Get the priority adjustment (absolute or relative). */
- adjustment = bb_xgetlarg(*argv, 10, INT_MIN, INT_MAX);
+ adjustment = xatoi_range(arg, INT_MIN/2, INT_MAX/2);
- while (*++argv) {
+ while ((arg = *++argv) != NULL) {
/* 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]))) {
+ if (arg[0] == '-' && arg[1]) {
+ static const char opts[] ALIGN1 = {
+ 'p', 'g', 'u', 0, PRIO_PROCESS, PRIO_PGRP, PRIO_USER
+ };
+ const char *p = strchr(opts, arg[1]);
+ if (p) {
which = p[4];
- continue;
+ if (!arg[2])
+ continue;
+ arg += 2;
}
}
/* Process an ID arg. */
if (which == PRIO_USER) {
struct passwd *p;
- if (!(p = getpwnam(*argv))) {
- bb_error_msg("unknown user: %s", *argv);
+ p = getpwnam(arg);
+ if (!p) {
+ bb_error_msg("unknown user %s", arg);
goto HAD_ERROR;
}
who = p->pw_uid;
} else {
- char *e;
- errno = 0;
- who = strtoul(*argv, &e, 10);
- if (*e || (*argv == e) || errno) {
- bb_error_msg("bad value: %s", *argv);
+ who = bb_strtou(arg, NULL, 10);
+ if (errno) {
+ bb_error_msg("invalid number '%s'", arg);
goto HAD_ERROR;
}
}
if (use_relative) {
int old_priority;
- errno = 0; /* Needed for getpriority error detection. */
+ errno = 0; /* Needed for getpriority error detection. */
old_priority = getpriority(which, who);
if (errno) {
- bb_perror_msg(Xetpriority_msg, who, 'g');
+ bb_perror_msg(Xetpriority_msg, 'g');
goto HAD_ERROR;
}
- new_priority = int_add_no_wrap(old_priority, adjustment);
+ new_priority = old_priority + adjustment;
} else {
new_priority = adjustment;
}
continue;
}
- bb_perror_msg(Xetpriority_msg, who, 's');
- HAD_ERROR:
+ bb_perror_msg(Xetpriority_msg, 's');
+ HAD_ERROR:
retval = EXIT_FAILURE;
}
projects / platform / upstream / busybox.git / blobdiff