//config: help
//config: Print number of CPUs
-//applet:IF_NPROC(APPLET(nproc, BB_DIR_USR_BIN, BB_SUID_DROP))
+//applet:IF_NPROC(APPLET_NOFORK(nproc, nproc, BB_DIR_USR_BIN, BB_SUID_DROP, nproc))
//kbuild:lib-$(CONFIG_NPROC) += nproc.o
//usage:#define nproc_trivial_usage
-//usage: ""
-//TODO: "[--all] [--ignore=N]"
+//usage: ""IF_LONG_OPTS("--all --ignore=N")
//usage:#define nproc_full_usage "\n\n"
-//usage: "Print number of CPUs"
+//usage: "Print number of available CPUs"
+//usage: IF_LONG_OPTS(
+//usage: "\n"
+//usage: "\n --all Number of installed CPUs"
+//usage: "\n --ignore=N Exclude N CPUs"
+//usage: )
#include <sched.h>
#include "libbb.h"
int nproc_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
unsigned long mask[1024];
- unsigned i, count = 0;
-
- //applet_long_options = ...;
- //getopt32(argv, "");
-
- //if --all, count /sys/devices/system/cpu/cpuN dirs, else:
+ int count = 0;
+#if ENABLE_LONG_OPTS
+ int ignore = 0;
+ int opts = getopt32long(argv, "\xfe:+",
+ "ignore\0" Required_argument "\xfe"
+ "all\0" No_argument "\xff"
+ , &ignore
+ );
+ if (opts & (1 << 1)) {
+ DIR *cpusd = opendir("/sys/devices/system/cpu");
+ if (cpusd) {
+ struct dirent *de;
+ while (NULL != (de = readdir(cpusd))) {
+ char *cpuid = strstr(de->d_name, "cpu");
+ if (cpuid && isdigit(cpuid[strlen(cpuid) - 1]))
+ count++;
+ }
+ closedir(cpusd);
+ }
+ } else
+#endif
if (sched_getaffinity(0, sizeof(mask), (void*)mask) == 0) {
+ int i;
for (i = 0; i < ARRAY_SIZE(mask); i++) {
unsigned long m = mask[i];
while (m) {
}
}
}
- if (count == 0)
- count++;
+
+ IF_LONG_OPTS(count -= ignore;)
+ if (count <= 0)
+ count = 1;
+
printf("%u\n", count);
return 0;