Index: busybox-1.31.1/miscutils/crond.c
===================================================================
--- busybox-1.31.1.orig/miscutils/crond.c	2021-04-01 18:02:00.570226000 +0800
+++ busybox-1.31.1/miscutils/crond.c	2021-04-01 18:30:02.992527721 +0800
@@ -74,6 +74,8 @@
 //usage:	)
 //usage:     "\n	-L FILE	Log to FILE"
 //usage:     "\n	-c DIR	Cron dir. Default:"CONFIG_FEATURE_CROND_DIR"/crontabs"
+//usage:     "\n	-p PID	file (default is /var/run/crond.pid)"
+
 
 #include "libbb.h"
 #include "common_bufsiz.h"
@@ -103,6 +105,9 @@
 #ifndef MAXLINES
 # define MAXLINES       256  /* max lines in non-root crontabs */
 #endif
+#ifndef PIDFILENAME
+#define PIDFILENAME     "/var/run/crond.pid"
+#endif
 
 
 typedef struct CronFile {
@@ -145,6 +150,7 @@
 	OPT_S = (1 << 4),
 	OPT_c = (1 << 5),
 	OPT_d = (1 << 6) * ENABLE_FEATURE_CROND_D,
+	OPT_p = (1 << 7)
 };
 
 struct globals {
@@ -160,12 +166,14 @@
 	char *env_var_shell;
 	char *env_var_logname;
 #endif
+	char *pid_filename;
 } FIX_ALIASING;
 #define G (*(struct globals*)bb_common_bufsiz1)
 #define INIT_G() do { \
 	setup_common_bufsiz(); \
 	G.log_level = 8; \
 	G.crontab_dir_name = CRONTABS; \
+	G.pid_filename = (char *)PIDFILENAME; \
 } while (0)
 
 /* Log levels:
@@ -1020,7 +1028,7 @@
 	INIT_G();
 
 	opts = getopt32(argv, "^"
-			"l:L:fbSc:" IF_FEATURE_CROND_D("d:")
+			"l:L:fbSc:p:" IF_FEATURE_CROND_D("d:")
 			"\0"
 			/* "-b after -f is ignored", and so on for every pair a-b */
 			"f-b:b-f:S-L:L-S" IF_FEATURE_CROND_D(":d-l")
@@ -1028,7 +1036,7 @@
 			":l+" IF_FEATURE_CROND_D(":d+")
 			,
 			&G.log_level, &G.log_filename, &G.crontab_dir_name
-			IF_FEATURE_CROND_D(,&G.log_level)
+			IF_FEATURE_CROND_D(,&G.log_level), &G.pid_filename
 	);
 	/* both -d N and -l N set the same variable: G.log_level */
 
@@ -1054,7 +1062,10 @@
 
 	log8("crond (busybox "BB_VER") started, log level %d", G.log_level);
 	rescan_crontab_dir();
-	write_pidfile_std_path_and_ext("crond");
+	if(strlen(G.pid_filename))
+		write_pidfile((const char *)G.pid_filename);
+	else
+		write_pidfile_std_path_and_ext("crond");
 #if ENABLE_FEATURE_CROND_SPECIAL_TIMES
 	if (touch_reboot_file())
 		start_jobs(START_ME_REBOOT); /* start @reboot entries, if any */