[master] 200f3060d jail: Move linux specific code from unix to linux jail

[Nils Goroll]

commit 200f3060daa5bf93e0ca821fec140dce30aa3a02
Author: Thibaut Artis <thibaut.artis at varnish-software.com>
Date:   Tue Jul 2 16:03:38 2024 +0200

    jail: Move linux specific code from unix to linux jail

diff --git a/bin/varnishd/mgt/mgt_jail_linux.c b/bin/varnishd/mgt/mgt_jail_linux.c
index f6c2a515b..1b18cf15b 100644
--- a/bin/varnishd/mgt/mgt_jail_linux.c
+++ b/bin/varnishd/mgt/mgt_jail_linux.c
@@ -40,6 +40,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <sys/prctl.h>
 #include <sys/stat.h>
 
 #include "mgt/mgt.h"
@@ -55,6 +56,14 @@ static void vjl_master(enum jail_master_e jme) {
 
 static void vjl_subproc(enum jail_subproc_e jse) {
 	jail_tech_unix.subproc(jse);
+	/*
+	 * On linux mucking about with uid/gid disables core-dumps,
+	 * reenable them again.
+	 */
+	if (prctl(PR_SET_DUMPABLE, 1) != 0) {
+		MGT_Complain(C_INFO,
+		    "Could not set dumpable bit.  Core dumps turned off");
+	}
 }
 
 static int vjl_make_subdir(const char *dname, const char *what, struct vsb *vsb) {
diff --git a/bin/varnishd/mgt/mgt_jail_unix.c b/bin/varnishd/mgt/mgt_jail_unix.c
index ecb51ffac..c6cab790a 100644
--- a/bin/varnishd/mgt/mgt_jail_unix.c
+++ b/bin/varnishd/mgt/mgt_jail_unix.c
@@ -44,10 +44,6 @@
 #include "mgt/mgt.h"
 #include "common/heritage.h"
 
-#ifdef __linux__
-#include <sys/prctl.h>
-#endif
-
 static gid_t vju_mgt_gid;
 static uid_t vju_uid;
 static gid_t vju_gid;
@@ -229,17 +225,6 @@ vju_subproc(enum jail_subproc_e jse)
 	} else {
 		AZ(setuid(vju_uid));
 	}
-
-#ifdef __linux__
-	/*
-	 * On linux mucking about with uid/gid disables core-dumps,
-	 * reenable them again.
-	 */
-	if (prctl(PR_SET_DUMPABLE, 1) != 0) {
-		MGT_Complain(C_INFO,
-		    "Could not set dumpable bit.  Core dumps turned off");
-	}
-#endif
 }
 
 static int v_matchproto_(jail_make_dir_f)