mirror of
https://github.com/sheumann/hush.git
synced 2024-11-19 08:31:11 +00:00
6ca409e0e4
trylink: explain how to modify link and drastically decrease amount of padding (unfortunately, needs hand editing ATM). *: add ALIGN1 / ALIGN2 to global strings and arrays of bytes and shorts size saving: 0.5k
129 lines
3.1 KiB
C
129 lines
3.1 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* renice implementation for busybox
|
|
*
|
|
* Copyright (C) 2005 Manuel Novoa III <mjn3@codepoet.org>
|
|
*
|
|
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
|
|
*/
|
|
|
|
/* 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 "libbb.h"
|
|
#include <sys/resource.h>
|
|
|
|
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)
|
|
{
|
|
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("bad value: %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;
|
|
}
|