at/at-3.2.5-mailwithhostname.patch

diff -ur b/atd.c a/atd.c
--- b/atd.c	2022-02-22 15:21:06.649147600 +0100
+++ a/atd.c	2022-02-22 15:49:13.640184845 +0100
@@ -98,6 +98,10 @@
 #define BATCH_INTERVAL_DEFAULT 60
 #define CHECK_INTERVAL 3600
 
+#ifndef MAXHOSTNAMELEN
+#define MAXHOSTNAMELEN 64
+#endif
+
 /* Global variables */
 
 uid_t real_uid, effective_uid;
@@ -115,6 +119,7 @@
 static int nothing_to_do = 0;
 unsigned int batch_interval;
 static int run_as_daemon = 0;
+static int mail_with_hostname = 0;
 static int hupped = 0;
 
 static volatile sig_atomic_t term_signal = 0;
@@ -301,6 +306,7 @@
     char fmt[64];
     unsigned long jobno;
     int rc;
+    char hostbuf[MAXHOSTNAMELEN];
 #ifdef WITH_PAM
     int retcode;
 #endif
@@ -455,6 +461,11 @@
 
     write_string(fd_out, "Subject: Output from your job ");
     write_string(fd_out, jobbuf);
+    if (mail_with_hostname > 0) {
+        gethostname(hostbuf, MAXHOSTNAMELEN-1);
+        write_string(fd_out, " ");
+        write_string(fd_out, hostbuf);
+    }
     write_string(fd_out, "\nTo: ");
     write_string(fd_out, mailname);    
     write_string(fd_out, "\n\n");
@@ -905,7 +916,7 @@
     run_as_daemon = 1;
     batch_interval = BATCH_INTERVAL_DEFAULT;
 
-    while ((c = getopt(argc, argv, "sdl:b:f")) != EOF) {
+    while ((c = getopt(argc, argv, "sdnl:b:f")) != EOF) {
 	switch (c) {
 	case 'l':
 	    if (sscanf(optarg, "%lf", &load_avg) != 1)
@@ -927,6 +938,10 @@
 	    daemon_foreground++;
 	    break;
 
+	case 'n':
+	    mail_with_hostname=1;
+	    break;
+
 	case 's':
 	    run_as_daemon = 0;
 	    break;