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start_stop_daemon: add -N <nice> compat

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[re]nice: add support for -nNNN w/o spaces, -NNN (nice only),
          simplified code
This commit is contained in:
Denis Vlasenko
2006-10-08 23:36:17 +00:00
parent 7039a66b58
commit ca3c981c07
6 changed files with 87 additions and 92 deletions
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55
procps/renice.c
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@@ -38,68 +38,61 @@
#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;
}
return s;
}
int renice_main(int argc, char **argv)
{
static const char Xetpriority_msg[] = "%d: %cetpriority";
static const char Xetpriority_msg[] = "%cetpriority";
int retval = EXIT_SUCCESS;
int which = PRIO_PROCESS; /* Default 'which' value. */
int use_relative = 0;
int adjustment, new_priority;
unsigned who;
char *arg;
++argv;
arg = *++argv;
/* Check if we are using a relative adjustment. */
if (argv[0] && (argv[0][0] == '-') && (argv[0][1] == 'n') && !argv[0][2]) {
if (arg && arg[0] == '-' && arg[1] == 'n') {
use_relative = 1;
++argv;
if (!arg[2])
arg = *++argv;
else
arg += 2;
}
if (!*argv) { /* No args? Then show usage. */
if (!arg) { /* No args? Then show usage. */
bb_show_usage();
}
/* Get the priority adjustment (absolute or relative). */
adjustment = xatoi(*argv);
adjustment = xatoi_range(arg, INT_MIN/2, INT_MAX/2);
while (*++argv) {
while ((arg = *++argv) != NULL) {
/* Check for a mode switch. */
if ((argv[0][0] == '-') && argv[0][1] && !argv[0][2]) {
if (arg[0] == '-' && arg[1]) {
static const char opts[]
= { 'p', 'g', 'u', 0, PRIO_PROCESS, PRIO_PGRP, PRIO_USER };
const char *p = strchr(opts, argv[0][1]);
const char *p = strchr(opts, arg[1]);
if (p) {
which = p[4];
continue;
if (!arg[2])
continue;
arg += 2;
}
}
/* Process an ID arg. */
if (which == PRIO_USER) {
struct passwd *p;
p = getpwnam(*argv);
p = getpwnam(arg);
if (!p) {
bb_error_msg("unknown user: %s", *argv);
bb_error_msg("unknown user: %s", arg);
goto HAD_ERROR;
}
who = p->pw_uid;
} else {
if (safe_strtou(*argv, &who)) {
bb_error_msg("bad value: %s", *argv);
if (safe_strtou(arg, &who)) {
bb_error_msg("bad value: %s", arg);
goto HAD_ERROR;
}
}
@@ -111,11 +104,11 @@ int renice_main(int argc, char **argv)
errno = 0; /* Needed for getpriority error detection. */
old_priority = getpriority(which, who);
if (errno) {
bb_perror_msg(Xetpriority_msg, who, 'g');
bb_perror_msg(Xetpriority_msg, 'g');
goto HAD_ERROR;
}
new_priority = int_add_no_wrap(old_priority, adjustment);
new_priority = old_priority + adjustment;
} else {
new_priority = adjustment;
}
@@ -124,8 +117,8 @@ int renice_main(int argc, char **argv)
continue;
}
bb_perror_msg(Xetpriority_msg, who, 's');
HAD_ERROR:
bb_perror_msg(Xetpriority_msg, 's');
HAD_ERROR:
retval = EXIT_FAILURE;
}