diff -uNr at-3.2.1/atd.c at-3.2.1.mod/atd.c
--- at-3.2.1/atd.c	2019-08-04 15:16:16.000000000 +0300
+++ at-3.2.1.mod/atd.c	2020-01-02 20:33:14.106959504 +0200
@@ -92,7 +92,7 @@
 /* Macros */
 
 #define BATCH_INTERVAL_DEFAULT 60
-#define CHECK_INTERVAL 3600
+#define CHECK_INTERVAL 5
 
 /* Global variables */
 
@@ -321,7 +321,7 @@
      * fact and return.
      */
     PRIV_START
-    rc = link(filename, newname);
+    rc = symlink(filename, newname);
     PRIV_END
     if (rc == -1) {
 	syslog(LOG_WARNING, "could not lock job %lu: %m", jobno);
@@ -397,7 +397,7 @@
      * NFS and works with local file systems.  It's not clear where
      * the bug is located.  -Joey
      */
-    sprintf(fmt, "#!/bin/sh\n# atrun uid=%%d gid=%%d\n# mail %%%ds %%d",
+    sprintf(fmt, "#!@TERMUX_PREFIX@/bin/sh\n# atrun uid=%%d gid=%%d\n# mail %%%ds %%d",
 	mailsize );
 
     if (fscanf(stream, fmt,
@@ -409,9 +409,11 @@
 	pabort("illegal mail name %.300s in job %8lu (%.300s)", mailname,
 	       jobno, filename);
 
+#ifndef __ANDROID__
     if (nuid != uid)
 	pabort("Job %8lu (%.500s) - userid %d does not match file uid %d",
 	       jobno, filename, nuid, uid);
+#endif
 
     /* We are now committed to executing this script.  Unlink the
      * original.
@@ -435,11 +437,14 @@
     if ((fd_out = open(filename,
 		    O_RDWR | O_CREAT | O_EXCL, S_IWUSR | S_IRUSR)) < 0)
 	perr("Cannot create output file");
+
+#ifndef __ANDROID__
     PRIV_START
     if (fchown(fd_out, uid, ngid) == -1)
         syslog(LOG_WARNING, "Warning: could not change owner of output file for job %li to %i:%i: %s",
                 jobno, uid, ngid, strerror(errno));
     PRIV_END
+#endif
 
     write_string(fd_out, "Subject: Output from your job ");
     write_string(fd_out, jobbuf);
@@ -503,6 +508,7 @@
 	    }
 #endif
 
+#ifndef __ANDROID__
 	    if (initgroups(pentry->pw_name, pentry->pw_gid))
 		perr("Cannot initialize the supplementary group access list");
 
@@ -511,11 +517,12 @@
 
 	    if (setuid(uid) < 0)
 		perr("Cannot set user id");
+#endif
 
 	    chdir("/");
 
-	    if (execle("/bin/sh", "sh", (char *) NULL, nenvp) != 0)
-		perr("Exec failed for /bin/sh");
+	    if (execle("@TERMUX_PREFIX@/bin/sh", "sh", (char *) NULL, nenvp) != 0)
+		perr("Exec failed for @TERMUX_PREFIX@/bin/sh");
 
 	PRIV_END
     }
@@ -571,6 +578,7 @@
 
 	PRIV_START
 
+#ifndef __ANDROID__
 	    if (initgroups(pentry->pw_name, pentry->pw_gid))
 		perr("Cannot initialize the supplementary group access list");
 
@@ -579,6 +587,7 @@
 
 	    if (setuid(uid) < 0)
 		perr("Cannot set user id");
+#endif
 
 	    chdir ("/");
 
@@ -804,6 +813,7 @@
  * daemon is fine.
  */
 
+#ifndef __ANDROID__
     if ((pwe = getpwnam(DAEMON_USERNAME)) == NULL)
 	perr("Cannot get uid for " DAEMON_USERNAME);
 
@@ -815,6 +825,7 @@
     daemon_gid = ge->gr_gid;
 
     RELINQUISH_PRIVS_ROOT(daemon_uid, daemon_gid)
+#endif
 
 #ifndef LOG_CRON
 #define LOG_CRON	LOG_DAEMON