diff options
| -rw-r--r-- | util-linux/chrt.c | 62 |
1 files changed, 34 insertions, 28 deletions
diff --git a/util-linux/chrt.c b/util-linux/chrt.c index 28e65457c..ede92310f 100644 --- a/util-linux/chrt.c +++ b/util-linux/chrt.c @@ -17,16 +17,16 @@ //kbuild:lib-$(CONFIG_CHRT) += chrt.o //usage:#define chrt_trivial_usage -//usage: "[-prfombi] [PRIO] [PID | PROG ARGS]" +//usage: "-m | -p [PRIO] PID | [-rfobi] PRIO PROG [ARGS]" //usage:#define chrt_full_usage "\n\n" //usage: "Change scheduling priority and class for a process\n" +//usage: "\n -m Show min/max priorities" //usage: "\n -p Operate on PID" //usage: "\n -r Set SCHED_RR class" //usage: "\n -f Set SCHED_FIFO class" //usage: "\n -o Set SCHED_OTHER class" //usage: "\n -b Set SCHED_BATCH class" //usage: "\n -i Set SCHED_IDLE class" -//usage: "\n -m Show min/max priorities" //usage: //usage:#define chrt_example_usage //usage: "$ chrt -r 4 sleep 900; x=$!\n" @@ -39,28 +39,32 @@ # define SCHED_IDLE 5 #endif -static const struct { - char name[sizeof("SCHED_OTHER")]; -} policies[] = { - { "SCHED_OTHER" }, /* 0:SCHED_OTHER */ - { "SCHED_FIFO" }, /* 1:SCHED_FIFO */ - { "SCHED_RR" }, /* 2:SCHED_RR */ - { "SCHED_BATCH" }, /* 3:SCHED_BATCH */ - { "" }, /* 4:SCHED_ISO */ - { "SCHED_IDLE" }, /* 5:SCHED_IDLE */ - /* 6:SCHED_DEADLINE */ -}; +static const char *policy_name(int pol) +{ + if (pol > 6) + return utoa(pol); + return nth_string( + "OTHER" "\0" /* 0:SCHED_OTHER */ + "FIFO" "\0" /* 1:SCHED_FIFO */ + "RR" "\0" /* 2:SCHED_RR */ + "BATCH" "\0" /* 3:SCHED_BATCH */ + "ISO" "\0" /* 4:SCHED_ISO */ + "IDLE" "\0" /* 5:SCHED_IDLE */ + "DEADLINE", /* 6:SCHED_DEADLINE */ + pol + ); +} static void show_min_max(int pol) { - const char *fmt = "%s min/max priority\t: %u/%u\n"; + const char *fmt = "SCHED_%s min/max priority\t: %u/%u\n"; int max, min; max = sched_get_priority_max(pol); min = sched_get_priority_min(pol); if ((max|min) < 0) - fmt = "%s not supported\n"; - printf(fmt, policies[pol].name, min, max); + fmt = "SCHED_%s not supported\n"; + printf(fmt, policy_name(pol), min, max); } #define OPT_m (1<<0) @@ -112,11 +116,11 @@ int chrt_main(int argc UNUSED_PARAM, char **argv) bb_show_usage(); if (opt & OPT_p) { pid_str = *argv++; - if (*argv) { /* "-p <priority> <pid> [...]" */ + if (*argv) { /* "-p PRIO PID [...]" */ priority = pid_str; pid_str = *argv; } - /* else "-p <pid>", and *argv == NULL */ + /* else "-p PID", and *argv == NULL */ pid = xatoul_range(pid_str, 1, ((unsigned)(pid_t)ULONG_MAX) >> 1); } else { priority = *argv++; @@ -130,16 +134,18 @@ int chrt_main(int argc UNUSED_PARAM, char **argv) print_rt_info: pol = sched_getscheduler(pid); if (pol < 0) - bb_perror_msg_and_die("can't %cet pid %d's policy", 'g', (int)pid); - printf("pid %d's %s scheduling policy: %s\n", - pid, current_new, policies[pol].name); + bb_perror_msg_and_die("can't %cet pid %u's policy", 'g', (int)pid); + printf("pid %u's %s scheduling policy: SCHED_%s\n", + pid, current_new, policy_name(pol) + ); if (sched_getparam(pid, &sp)) - bb_perror_msg_and_die("can't get pid %d's attributes", (int)pid); - printf("pid %d's %s scheduling priority: %d\n", - (int)pid, current_new, sp.sched_priority); + bb_perror_msg_and_die("can't get pid %u's attributes", (int)pid); + printf("pid %u's %s scheduling priority: %d\n", + (int)pid, current_new, sp.sched_priority + ); if (!*argv) { - /* Either it was just "-p <pid>", - * or it was "-p <priority> <pid>" and we came here + /* Either it was just "-p PID", + * or it was "-p PRIO PID" and we came here * for the second time (see goto below) */ return EXIT_SUCCESS; } @@ -152,9 +158,9 @@ int chrt_main(int argc UNUSED_PARAM, char **argv) ); if (sched_setscheduler(pid, policy, &sp) < 0) - bb_perror_msg_and_die("can't %cet pid %d's policy", 's', (int)pid); + bb_perror_msg_and_die("can't %cet pid %u's policy", 's', (int)pid); - if (!argv[0]) /* "-p <priority> <pid> [...]" */ + if (!argv[0]) /* "-p PRIO PID [...]" */ goto print_rt_info; BB_EXECVP_or_die(argv); |