at-secprec

--- a/at.c  2015-12-06 16:45:10.000000000 +0100
+++ b/at.c  2016-02-20 11:36:22.000000000 +0100
@@ -122,7 +122,7 @@
 extern char **environ;
 int fcreated;
 char *namep;
-char atfile[] = ATJOB_DIR "/12345678901234";
+char atfile[] = ATJOB_DIR "/12345678901234567";

 char *atinput = (char *) 0;    /* where to get input from */
 char atqueue = 0;      /* which queue to examine for jobs (atq) */
@@ -244,6 +244,7 @@
     int kill_errno;
     int rc;
     int mailsize = 128;
+    char *shell_path;

 /* Install the signal handler for SIGINT; terminate after removing the
  * spool file if necessary
@@ -299,7 +300,7 @@
        perr("Cannot generate job number");

    (void)snprintf(ppos, sizeof(atfile) - (ppos - atfile),
-              "%c%5lx%8lx", queue, jobno, (unsigned long) (runtimer / 60));
+              "%c%5lx%8lx%2u", queue, jobno, (unsigned long) (runtimer / 60), (unsigned int) (runtimer % 60));

    for (ap = ppos; *ap != '\0'; ap++)
        if (*ap == ' ')
@@ -352,6 +353,19 @@
     if ((fp = fdopen(fd, "w")) == NULL)
    panic("Cannot reopen atjob file");

+   shell_path = getenv("SHELL");
+   if(shell_path == NULL || shell_path[0] == '\0')
+   {
+   /* POSIX.2 allows the shell specified by the user's SHELL environment
+      variable, the login shell from the user's password database entry,
+      or /bin/sh to be the command interpreter that processes the at-job.
+      It also alows a warning diagnostic to be printed.  Because of the
+      possible variance, we always output the diagnostic. */
+
+       shell_path = "/bin/sh";
+       fprintf(stderr, "warning: commands will be executed using %s\n", shell_path);
+   }
+
     /* Get the userid to mail to, first by trying getlogin(), which reads
      * /var/run/utmp, then from LOGNAME, finally from getpwuid().
      */
@@ -374,8 +388,8 @@
        perr("Cannot open input file %.500s", atinput);
     }

-    fprintf(fp, "#!/bin/sh\n# atrun uid=%d gid=%d\n# mail %s %d\n",
-       real_uid, real_gid, mailname, send_mail);
+    fprintf(fp, "#!%s\n# atrun uid=%d gid=%d\n# mail %s %d\n",
+       shell_path, real_uid, real_gid, mailname, send_mail);

     /* Write out the umask at the time of invocation
      */
@@ -574,6 +588,7 @@
     struct stat buf;
     struct tm *runtime;
     unsigned long ctm;
+    unsigned int  ctmsec;
     char queue;
     long jobno;
     time_t runtimer;
@@ -600,21 +615,25 @@
        || atverify)
        continue;

-   if (sscanf(dirent->d_name, "%c%5lx%8lx", &queue, &jobno, &ctm) != 3)
-       continue;
+   if (sscanf(dirent->d_name, "%c%5lx%8lx%2u", &queue, &jobno, &ctm, &ctmsec) != 4)
+   {
+       ctmsec = 0;
+       if (sscanf(dirent->d_name, "%c%5lx%8lx", &queue, &jobno, &ctm) != 3)
+           continue;
+   }

    if (atqueue && (queue != atqueue))
        continue;

-   runtimer = 60 * (time_t) ctm;
+   runtimer = (time_t) ctm * 60 + ctmsec;
    runtime = localtime(&runtimer);

    strftime(timestr, TIMESIZE, TIMEFORMAT_POSIX, runtime);

    if ((pwd = getpwuid(buf.st_uid)))
-     printf("%ld\t%s %c %s\n", jobno, timestr, queue, pwd->pw_name);
+     printf("%ld\t%s\tqueue=%c user=%s\n", jobno, timestr, queue, pwd->pw_name);
    else
-     printf("%ld\t%s %c\n", jobno, timestr, queue);
+     printf("%ld\t%s\tqueue=%c\n", jobno, timestr, queue);
     }
     PRIV_END
 }
@@ -857,8 +876,6 @@
        fprintf(stderr, "invalid date format: %s\n", optarg);
        exit(EXIT_FAILURE);
        }
-       /* drop seconds */
-       timer -= timer % 60;
        break;

    default:
@@ -937,14 +954,6 @@
        fprintf(stderr, "%s\n", asctime(tm));
    }

-   /* POSIX.2 allows the shell specified by the user's SHELL environment
-      variable, the login shell from the user's password database entry,
-      or /bin/sh to be the command interpreter that processes the at-job.
-      It also alows a warning diagnostic to be printed.  Because of the
-      possible variance, we always output the diagnostic. */
-
-   fprintf(stderr, "warning: commands will be executed using /bin/sh\n");
-
    writefile(timer, queue);
    break;