diff options
| -rw-r--r-- | AUTHORS | 3 | ||||
| -rw-r--r-- | coreutils/Config.in | 6 | ||||
| -rw-r--r-- | coreutils/Makefile.in | 1 | ||||
| -rw-r--r-- | coreutils/nice.c | 86 | ||||
| -rw-r--r-- | include/applets.h | 3 | ||||
| -rw-r--r-- | include/usage.h | 18 | ||||
| -rw-r--r-- | procps/renice.c | 132 |
7 files changed, 227 insertions, 22 deletions
@@ -88,7 +88,8 @@ Glenn McGrath <bug1@iinet.net.au> 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 diff --git a/coreutils/Config.in b/coreutils/Config.in index 4aff5ce..a299506 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 aacb813..6382365 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 0000000..b66f9d8 --- /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 <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); +} diff --git a/include/applets.h b/include/applets.h index 90d4195..1257032 100644 --- a/include/applets.h +++ b/include/applets.h @@ -412,6 +412,9 @@ #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 diff --git a/include/usage.h b/include/usage.h index c53ead0..fd0f681 100644 --- a/include/usage.h +++ b/include/usage.h @@ -1813,6 +1813,13 @@ "\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 \ @@ -2011,11 +2018,14 @@ "\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 \ "" diff --git a/procps/renice.c b/procps/renice.c index a6f0820..d4ce66d 100644 --- a/procps/renice.c +++ b/procps/renice.c @@ -1,8 +1,8 @@ +/* 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 @@ -20,35 +20,133 @@ * */ +/* 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; } |