static __inline__ int __syscall_nice(int incr)
{
int old_priority;
# if 1
/* This should never fail. */
old_priority = getpriority(PRIO_PROCESS, 0);
# else
/* But if you want to be paranoid... */
int old_errno;
old_errno = errno;
__set_errno(0);
old_priority = getpriority(PRIO_PROCESS, 0);
if ((old_priority == -1) && errno) {
return -1;
}
__set_errno(old_errno);
# endif
if (setpriority(PRIO_PROCESS, 0, int_add_no_wrap(old_priority, incr))) {
__set_errno(EPERM); /* SUSv3 mandates EPERM for nice failure. */
return -1;
}
return 0;
}
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);
}
int renice_main(int argc, char **argv)
{
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;
++argv;
/* 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) {
/* 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;
}
}
/* 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 {
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;
}
/* 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;
}