Revert "cpuset: add --count"

The patch introduced a behavior change coming from getopt_long, namely
the entire argument array would be parsed looking for opts, which
affected uses spawning new processes without passing '--' to delimit
where cpuset arguments end. [1]

Apart from that turns out the change had a bug: using CPU_LEVEL_ROOT
instead of CPU_LEVEL_WHICH, returning a different cpuset than intended.
[2]

The intended functionality is provided with nproc(1), which landed after
this change.

As such, revert for the time being.

This reverts commit d9d5f2c042a51a9f0dd69eb1fc349efd81ffa483.

Reported by:	Mark Millard [1]
Reported by:	jbeich [2]

2 files changed, 2 insertions, 65 deletions

diff --git a/usr.bin/cpuset/cpuset.1 b/usr.bin/cpuset/cpuset.1
index 31a3e45134d7..1d0180c98991 100644
--- a/usr.bin/cpuset/cpuset.1
+++ b/usr.bin/cpuset/cpuset.1
@@ -25,7 +25,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd August 25, 2022
+.Dd July 3, 2018
 .Dt CPUSET 1
 .Os
 .Sh NAME
@@ -57,10 +57,6 @@
 .Fl g
 .Op Fl cir
 .Op Fl d Ar domain | Fl j Ar jail | Fl p Ar pid | Fl t Ar tid | Fl s Ar setid | Fl x Ar irq
-.Nm
-.Fl g
-.Fl -count
-.Fl p Ar pid
 .Sh DESCRIPTION
 The
 .Nm
@@ -176,16 +172,6 @@ Specifies a thread id as the target of the operation.
 .It Fl x Ar irq
 Specifies an irq as the target of the operation.
 .El
-.Pp
-The long options are as follows:
-.Bl -tag -width ".Fl -count"
-.It Fl -count
-Count the number of hardware threads included in the set. Requires
-.Fl g
-and
-.Fl p
-flags.
-.El
 .Sh EXIT STATUS
 .Ex -std
 .Sh EXAMPLES
diff --git a/usr.bin/cpuset/cpuset.c b/usr.bin/cpuset/cpuset.c
index 528cbc39bbc7..79c6c2b6ca79 100644
--- a/usr.bin/cpuset/cpuset.c
+++ b/usr.bin/cpuset/cpuset.c
@@ -44,7 +44,6 @@ __FBSDID("$FreeBSD$");
 #include <ctype.h>
 #include <err.h>
 #include <errno.h>
-#include <getopt.h>
 #include <jail.h>
 #include <limits.h>
 #include <stdio.h>
@@ -53,9 +52,6 @@ __FBSDID("$FreeBSD$");
 #include <unistd.h>
 #include <string.h>
 
-/*
- * Short opts.
- */
 static int Cflag;
 static int cflag;
 static int dflag;
@@ -69,24 +65,12 @@ static int rflag;
 static int sflag;
 static int tflag;
 static int xflag;
-
-/*
- * Long-only opts.
- */
-static int count_flag;
-
 static id_t id;
 static cpulevel_t level;
 static cpuwhich_t which;
 
-#define OPT_THREADCOUNT	(CHAR_MAX + 1)
 static void usage(void);
 
-static struct option long_opts[] = {
-	{ "count", no_argument, NULL, OPT_THREADCOUNT },
-	{ NULL,	0, NULL, 0 }
-};
-
 struct numa_policy {
 	const char 	*name;
 	int		policy;
@@ -299,18 +283,6 @@ printsetid(void)
 	    levelnames[level], setid);
 }
 
-static void
-printcpucount(void)
-{
-	cpuset_t mask;
-	CPU_ZERO(&mask);
-
-	if (cpuset_getaffinity(CPU_LEVEL_ROOT, CPU_WHICH_PID, id,
-	    sizeof(mask), &mask) != 0)
-		err(EXIT_FAILURE, "getaffinity");
-	printf("%d\n", CPU_COUNT(&mask));
-}
-
 int
 main(int argc, char *argv[])
 {
@@ -328,8 +300,7 @@ main(int argc, char *argv[])
 	level = CPU_LEVEL_WHICH;
 	which = CPU_WHICH_PID;
 	id = pid = tid = setid = -1;
-	while ((ch = getopt_long(argc, argv,
-	    "Ccd:gij:l:n:p:rs:t:x:", long_opts, NULL)) != -1) {
+	while ((ch = getopt(argc, argv, "Ccd:gij:l:n:p:rs:t:x:")) != -1) {
 		switch (ch) {
 		case 'C':
 			Cflag = 1;
@@ -388,30 +359,12 @@ main(int argc, char *argv[])
 			which = CPU_WHICH_IRQ;
 			id = atoi(optarg);
 			break;
-		case OPT_THREADCOUNT:
-			count_flag = 1;
-			break;
 		default:
 			usage();
 		}
 	}
 	argc -= optind;
 	argv += optind;
-
-	/*
-	 * count requires g and p flags and is incompatible with
-	 * everything else for simplicity.
-	 */
-	if (count_flag) {
-		if (!gflag || !pflag)
-			usage();
-		if (Cflag || cflag || dflag || iflag || jflag || lflag ||
-		    nflag || rflag || sflag || tflag || xflag)
-			usage();
-		printcpucount();
-		exit(EXIT_SUCCESS);
-	}
-
 	if (gflag) {
 		if (argc || Cflag || lflag || nflag)
 			usage();
@@ -518,7 +471,5 @@ usage(void)
 	fprintf(stderr,
     "       cpuset -g [-cir]\n"
     "              [-d domain | -j jailid | -p pid | -t tid | -s setid | -x irq]\n");
-	fprintf(stderr,
-    "       cpuset -g --count -p pid\n");
 	exit(1);
 }