ntpd: default to FEATURE_NTP_AUTH=y

[oweals/busybox.git] / coreutils / nice.c

diff --git a/coreutils/nice.c b/coreutils/nice.c
index b66f9d82d824f411d250483b90ecf67cb4f110e5..da1696c4201e41b9e5c2229e752faa9425b9b502 100644 (file)
--- a/coreutils/nice.c
+++ b/coreutils/nice.c
@@ -4,83 +4,65 @@
  *
  * 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.
  */
+//config:config NICE
+//config:      bool "nice (1.8 kb)"
+//config:      default y
+//config:      help
+//config:      nice runs a program with modified scheduling priority.
 
-#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"
+//applet:IF_NICE(APPLET_NOEXEC(nice, nice, BB_DIR_BIN, BB_SUID_DROP, nice))
 
-static inline int int_add_no_wrap(int a, int b)
-{
-       int s = a + b;
+//kbuild:lib-$(CONFIG_NICE) += nice.o
 
-       if (b < 0) {
-               if (s > a) s = INT_MIN;
-       } else {
-               if (s < a) s = INT_MAX;
-       }
+//usage:#define nice_trivial_usage
+//usage:       "[-n ADJUST] [PROG ARGS]"
+//usage:#define nice_full_usage "\n\n"
+//usage:       "Change scheduling priority, run PROG\n"
+//usage:     "\n       -n ADJUST       Adjust priority by ADJUST"
 
-       return s;
-}
+#include "libbb.h"
 
-int nice_main(int argc, char **argv)
+int nice_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int nice_main(int argc UNUSED_PARAM, 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);
+       if (!*++argv) { /* No args, so (GNU) output current nice value. */
+               printf("%d\n", old_priority);
+               fflush_stdout_and_exit(EXIT_SUCCESS);
        }
 
-       adjustment = 10;                        /* Set default adjustment. */
+       adjustment = 10;  /* Set default adjustment. */
+
+       if (argv[0][0] == '-') {
+               char *nnn = argv[0] + 1;
+               if (nnn[0] == 'n') { /* -n */
+                       nnn += 1;
+                       if (!nnn[0]) { /* "-n NNN" */
+                               nnn = *++argv;
+                       }
+                       /* else: "-nNNN" (w/o space) */
+               }
+               /* else: "-NNN" (NNN may be negative) - same as "-n NNN" */
 
-       if ((argv[0][0] == '-') && (argv[0][1] == 'n') && !argv[0][2]) { /* "-n" */
-               if (argc < 4) {                 /* Missing priority and/or utility! */
+               if (!nnn || !argv[1]) {  /* Missing priority or PROG! */
                        bb_show_usage();
                }
-               adjustment = bb_xgetlarg(argv[1], 10, INT_MIN, INT_MAX);
-               argv += 2;
+               adjustment = xatoi_range(nnn, INT_MIN/2, INT_MAX/2);
+               argv++;
        }
 
-       {  /* Set our priority.  Handle integer wrapping for old + adjust. */
-               int new_priority = int_add_no_wrap(old_priority, adjustment);
+       {  /* Set our priority. */
+               int prio = old_priority + adjustment;
 
-               if (setpriority(PRIO_PROCESS, 0, new_priority) < 0) {
-                       bb_perror_msg_and_die(Xetpriority_msg, 's');
+               if (setpriority(PRIO_PROCESS, 0, prio) < 0) {
+                       bb_perror_msg_and_die("setpriority(%d)", prio);
                }
        }
-       
-       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);
+       BB_EXECVP_or_die(argv);
 }