src/journal/journald-wall.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2014 Sebastian Thorarensen
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include "alloc-util.h"
  21 #include "format-util.h"
  22 #include "journald-server.h"
  23 #include "journald-wall.h"
  24 #include "process-util.h"
  25 #include "string-util.h"
  26 #include "utmp-wtmp.h"
  27
  28 void server_forward_wall(
  29                 Server *s,
  30                 int priority,
  31                 const char *identifier,
  32                 const char *message,
  33                 const struct ucred *ucred) {
  34
  35         _cleanup_free_ char *ident_buf = NULL, *l_buf = NULL;
  36         const char *l;
  37         int r;
  38
  39         assert(s);
  40         assert(message);
  41
  42         if (LOG_PRI(priority) > s->max_level_wall)
  43                 return;
  44
  45         if (ucred) {
  46                 if (!identifier) {
  47                         get_process_comm(ucred->pid, &ident_buf);
  48                         identifier = ident_buf;
  49                 }
  50
  51                 if (asprintf(&l_buf, "%s["PID_FMT"]: %s", strempty(identifier), ucred->pid, message) < 0) {
  52                         log_oom();
  53                         return;
  54                 }
  55
  56                 l = l_buf;
  57
  58         } else if (identifier) {
  59
  60                 l = l_buf = strjoin(identifier, ": ", message);
  61                 if (!l_buf) {
  62                         log_oom();
  63                         return;
  64                 }
  65         } else
  66                 l = message;
  67
  68         r = utmp_wall(l, "systemd-journald", NULL, NULL, NULL);
  69         if (r < 0)
  70                 log_debug_errno(r, "Failed to send wall message: %m");
  71 }