6 files changed, 60 insertions, 32 deletions
diff --git a/lib/libbz2/Makefile b/lib/libbz2/Makefile
index d773f202dd67..2aedbaed4328 100644
--- a/lib/libbz2/Makefile
+++ b/lib/libbz2/Makefile
@@ -13,4 +13,17 @@ CFLAGS+=	-I${BZ2DIR}
 
 WARNS?=		3
 
+BZIP2_VERSION!=	sed -n '/bzip2\/libbzip2 version /{s/.*version //;s/ of.*//p;q;}' ${BZ2DIR}/bzlib.h
+
+bzip2.pc: bzip2.pc.in
+	sed -e 's,@prefix@,/usr,g ; \
+		s,@exec_prefix@,$${prefix},g ; \
+		s,@libdir@,${LIBDIR},g ; \
+		s,@sharedlibdir@,${SHLIBDIR},g ; \
+		s,@includedir@,${INCLUDEDIR},g ; \
+		s,@VERSION@,${BZIP2_VERSION},g ;' \
+		${.ALLSRC} > ${.TARGET}
+
+PCFILES=	bzip2.pc
+
 .include <bsd.lib.mk>
diff --git a/lib/libbz2/bzip2.pc.in b/lib/libbz2/bzip2.pc.in
new file mode 100644
index 000000000000..d91c9931a58a
--- /dev/null
+++ b/lib/libbz2/bzip2.pc.in
@@ -0,0 +1,11 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+sharedlibdir=@sharedlibdir@
+includedir=@includedir@
+
+Name: bzip2
+Description: bzip2 compression library
+Version: @VERSION@
+Libs: -L${libdir} -lbz2
+Cflags: -I${includedir}
diff --git a/lib/libc/gen/getgrouplist.3 b/lib/libc/gen/getgrouplist.3
index e3939fc2481a..9e05ff7e7a29 100644
--- a/lib/libc/gen/getgrouplist.3
+++ b/lib/libc/gen/getgrouplist.3
@@ -33,7 +33,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd August 29, 2025
+.Dd October 9, 2025
 .Dt GETGROUPLIST 3
 .Os
 .Sh NAME
@@ -48,30 +48,37 @@
 .Sh DESCRIPTION
 The
 .Fn getgrouplist
-function reads through the group database to retrieve the supplementary groups
-for the user specified in
-.Fa name ,
+function retrieves from the group database the supplementary groups for the user
+specified in
+.Fa name
 and returns the effective group list, whose first group is the value of
 .Fa basegid
-and the others are the retrieved supplementary groups.
+and the others are the supplementary groups.
 .Fa basegid
-typically is the user's group number from the password database.
+typically is the user's initial numerical group ID from the password database.
 .Pp
 The effective group list is returned in the array pointed to by
 .Fa groups .
-The caller specifies the size of the
+The caller specifies the length of the
 .Fa groups
 array in the integer pointed to by
-.Fa ngroups ;
-the actual number of groups found is returned in
+.Fa ngroups .
+The number of groups of the effective group list, which may be greater than the
+.Fa groups
+array's length, is returned through
 .Fa ngroups .
 .Sh RETURN VALUES
 The
 .Fn getgrouplist
-function
-returns 0 on success and \-1 if the size of the group list is too small to
-hold all the user's groups.
-Here, the group array will be filled with as many groups as will fit.
+function returns 0 on success and \-1 if the length of the group list is too
+small to hold all the user's groups.
+In the latter case, the
+.Fa groups
+array is filled with as many groups as possible from the start of the effective
+group list, and the length pointed to by
+.Fa ngroups
+is set to the full length of the latter, thus to a value strictly greater than
+before the call.
 .Sh FILES
 .Bl -tag -width /etc/group -compact
 .It Pa /etc/group
diff --git a/lib/libc/gen/initgroups.3 b/lib/libc/gen/initgroups.3
index 4f538fb180ec..74133e7d7048 100644
--- a/lib/libc/gen/initgroups.3
+++ b/lib/libc/gen/initgroups.3
@@ -33,7 +33,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd September 17, 2025
+.Dd October 9, 2025
 .Dt INITGROUPS 3
 .Os
 .Sh NAME
@@ -67,9 +67,9 @@ The
 .Fn initgroups
 function may fail and set
 .Va errno
-to any of the errors specified for the library function
-.Xr setgroups 2 .
-It may also return:
+to any of the errors specified for the
+.Xr setgroups 2
+system call, or to:
 .Bl -tag -width Er
 .It Bq Er ENOMEM
 The
diff --git a/lib/libcasper/services/cap_fileargs/cap_fileargs.h b/lib/libcasper/services/cap_fileargs/cap_fileargs.h
index 8207671d9753..d3a0150044d7 100644
--- a/lib/libcasper/services/cap_fileargs/cap_fileargs.h
+++ b/lib/libcasper/services/cap_fileargs/cap_fileargs.h
@@ -75,7 +75,7 @@ fileargs_init(int argc __unused, char *argv[] __unused, int flags, mode_t mode,
     cap_rights_t *rightsp __unused, int operations __unused) {
 	fileargs_t *fa;
 
-	fa = malloc(sizeof(*fa));
+	fa = (fileargs_t *)malloc(sizeof(*fa));
 	if (fa != NULL) {
 		fa->fa_flags = flags;
 		fa->fa_mode = mode;
diff --git a/lib/libsys/getgroups.2 b/lib/libsys/getgroups.2
index 4881a65d532e..4e94b32d4e7b 100644
--- a/lib/libsys/getgroups.2
+++ b/lib/libsys/getgroups.2
@@ -33,7 +33,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd September 17, 2025
+.Dd October 10, 2025
 .Dt GETGROUPS 2
 .Os
 .Sh NAME
@@ -107,10 +107,8 @@ array.
 The
 .Fn getgroups
 system call conforms to
-.St -p1003.1-2008
-with the additional properties that supplementary groups are reported in
-strictly ascending order and the returned size coincides with the cardinal of
-the set.
+.St -p1003.1-2008 ,
+not reporting the effective group ID.
 .Sh HISTORY
 The
 .Fn getgroups
@@ -121,8 +119,8 @@ Since
 .Fx 14.3 ,
 the
 .Fn getgroups
-system call has treated the supplementary groups as a set, reporting them in
-strictly ascending order and returning the cardinal of the set.
+system call has been reporting the supplementary groups in strictly ascending
+order.
 .Pp
 Before
 .Fx 15.0 ,
@@ -138,15 +136,14 @@ system call gets the supplementary groups set in the
 array.
 In particular, as evoked in
 .Sx HISTORY ,
-it does not anymore retrieve the effective GID in the first slot of
+it does not anymore retrieve the effective group ID in the first slot of
 .Fa gidset .
-Programs should not make any assumption about which group is placed in the first
-slot of
-.Fa gidset
-other than it being the supplementary group with smallest GID.
+Programs that process this slot in a specific way must be modified to obtain the
+effective group ID through other means, such as a call to
+.Xr getegid 2 .
 .Pp
-The effective GID is present in the supplementary groups set if and only if it
-was explicitly set as a supplementary group.
+The effective group ID is present in the supplementary groups set if and only if
+it was explicitly set as a supplementary group.
 The function
 .Fn initgroups
 enforces that, while the