From 2c511609c4d92ee4e3e603d449c13579d1ea641a Mon Sep 17 00:00:00 2001 From: Manuel Novoa III Date: Sun, 13 Feb 2005 20:14:05 +0000 Subject: Add 'nice' and replace 'renice' with a new implementation. --- coreutils/Config.in | 6 ++++ coreutils/Makefile.in | 1 + coreutils/nice.c | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 93 insertions(+) create mode 100644 coreutils/nice.c (limited to 'coreutils') diff --git a/coreutils/Config.in b/coreutils/Config.in index 4aff5ce69..a299506e6 100644 --- a/coreutils/Config.in +++ b/coreutils/Config.in @@ -329,6 +329,12 @@ config CONFIG_MV 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 diff --git a/coreutils/Makefile.in b/coreutils/Makefile.in index aacb813b3..63823657f 100644 --- a/coreutils/Makefile.in +++ b/coreutils/Makefile.in @@ -58,6 +58,7 @@ COREUTILS-$(CONFIG_MKDIR) += mkdir.o COREUTILS-$(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 diff --git a/coreutils/nice.c b/coreutils/nice.c new file mode 100644 index 000000000..b66f9d82d --- /dev/null +++ b/coreutils/nice.c @@ -0,0 +1,86 @@ +/* vi: set sw=4 ts=4: */ +/* + * nice implementation for busybox + * + * Copyright (C) 2005 Manuel Novoa III + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#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); +} -- cgit v1.2.3