From 0cecbe7d5de237a6c699c67ae53ae2e2481eff43 Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Wed, 12 Apr 2017 14:16:29 +0200 Subject: Sort more misplaced applets into coreutils or util-linux No code changes Surprisingly, nice and renice are coming from different packages :) Signed-off-by: Denys Vlasenko --- util-linux/renice.c | 148 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 148 insertions(+) create mode 100644 util-linux/renice.c (limited to 'util-linux/renice.c') diff --git a/util-linux/renice.c b/util-linux/renice.c new file mode 100644 index 000000000..64213c680 --- /dev/null +++ b/util-linux/renice.c @@ -0,0 +1,148 @@ +/* vi: set sw=4 ts=4: */ +/* + * renice implementation for busybox + * + * Copyright (C) 2005 Manuel Novoa III + * + * Licensed under GPLv2 or later, see file LICENSE in this source tree. + */ + +/* 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. + */ +//config:config RENICE +//config: bool "renice" +//config: default y +//config: help +//config: Renice alters the scheduling priority of one or more running +//config: processes. + +//applet:IF_RENICE(APPLET(renice, BB_DIR_USR_BIN, BB_SUID_DROP)) + +//kbuild:lib-$(CONFIG_RENICE) += renice.o + +//usage:#define renice_trivial_usage +//usage: "[-n] PRIORITY [[-p | -g | -u] ID...]..." +//usage:#define renice_full_usage "\n\n" +//usage: "Change scheduling priority of a running process\n" +//usage: "\n -n Add PRIORITY to current nice value" +//usage: "\n Without -n, nice value is set to PRIORITY" +//usage: "\n -p Process ids (default)" +//usage: "\n -g Process group ids" +//usage: "\n -u Process user names" + +#include "libbb.h" +#include + +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) MAIN_EXTERNALLY_VISIBLE; +int renice_main(int argc UNUSED_PARAM, char **argv) +{ + static const char Xetpriority_msg[] ALIGN1 = "%cetpriority"; + + int retval = EXIT_SUCCESS; + int which = PRIO_PROCESS; /* Default 'which' value. */ + int use_relative = 0; + int adjustment, new_priority; + unsigned who; + char *arg; + + /* 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 (arg && arg[0] == '-' && arg[1] == 'n') { + use_relative = 1; + if (!arg[2]) + arg = *++argv; + else + arg += 2; + } + + if (!arg) { /* No args? Then show usage. */ + bb_show_usage(); + } + + /* Get the priority adjustment (absolute or relative). */ + adjustment = xatoi_range(arg, INT_MIN/2, INT_MAX/2); + + while ((arg = *++argv) != NULL) { + /* Check for a mode switch. */ + 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]; + if (!arg[2]) + continue; + arg += 2; + } + } + + /* Process an ID arg. */ + if (which == PRIO_USER) { + struct passwd *p; + p = getpwnam(arg); + if (!p) { + bb_error_msg("unknown user %s", arg); + goto HAD_ERROR; + } + who = p->pw_uid; + } else { + who = bb_strtou(arg, NULL, 10); + if (errno) { + bb_error_msg("invalid number '%s'", arg); + 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, 'g'); + goto HAD_ERROR; + } + + new_priority = old_priority + adjustment; + } else { + new_priority = adjustment; + } + + if (setpriority(which, who, new_priority) == 0) { + continue; + } + + bb_perror_msg(Xetpriority_msg, 's'); + HAD_ERROR: + retval = EXIT_FAILURE; + } + + /* 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; +} -- cgit v1.2.3