[git commit] nproc: implement --all --ignore=N
Denys Vlasenko
vda.linux at googlemail.com
Fri Jul 6 14:19:04 UTC 2018
commit: https://git.busybox.net/busybox/commit/?id=4a85d56c4cda90d0c175f29eb320375d14ead507
branch: https://git.busybox.net/busybox/commit/?id=refs/heads/master
function old new delta
nproc_main 98 242 +144
packed_usage 32799 32816 +17
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 161/0) Total: 161 bytes
Signed-off-by: haroon maqsood <maqsood3525 at live.com>
Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
coreutils/nproc.c | 44 ++++++++++++++++++++++++++++++++++----------
1 file changed, 34 insertions(+), 10 deletions(-)
diff --git a/coreutils/nproc.c b/coreutils/nproc.c
index 336b176ca..0ea8d1001 100644
--- a/coreutils/nproc.c
+++ b/coreutils/nproc.c
@@ -14,10 +14,14 @@
//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"
@@ -26,13 +30,30 @@ int nproc_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int nproc_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
unsigned long mask[1024];
- unsigned i, count = 0;
-
- //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) {
@@ -42,8 +63,11 @@ int nproc_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
}
}
}
- if (count == 0)
- count++;
+
+ IF_LONG_OPTS(count -= ignore;)
+ if (count <= 0)
+ count = 1;
+
printf("%u\n", count);
return 0;
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