lib/libalpm/log.c

   1 /*
   2  *  log.c
   3  *
   4  *  Copyright (c) 2006-2011 Pacman Development Team <pacman-dev@archlinux.org>
   5  *  Copyright (c) 2002-2006 by Judd Vinet <jvinet@zeroflux.org>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "config.h"
  22
  23 #include <stdio.h>
  24 #include <stdarg.h>
  25 #include <errno.h>
  26
  27 /* libalpm */
  28 #include "log.h"
  29 #include "handle.h"
  30 #include "util.h"
  31 #include "alpm.h"
  32
  33 /** \addtogroup alpm_log Logging Functions
  34  * @brief Functions to log using libalpm
  35  * @{
  36  */
  37
  38 /** A printf-like function for logging.
  39  * @param handle the context handle
  40  * @param fmt output format
  41  * @return 0 on success, -1 on error (pm_errno is set accordingly)
  42  */
  43 int SYMEXPORT alpm_logaction(alpm_handle_t *handle, const char *fmt, ...)
  44 {
  45         int ret;
  46         va_list args;
  47
  48         ASSERT(handle != NULL, return -1);
  49
  50         /* check if the logstream is open already, opening it if needed */
  51         if(handle->logstream == NULL) {
  52                 handle->logstream = fopen(handle->logfile, "a");
  53                 /* if we couldn't open it, we have an issue */
  54                 if(handle->logstream == NULL) {
  55                         if(errno == EACCES) {
  56                                 handle->pm_errno = ALPM_ERR_BADPERMS;
  57                         } else if(errno == ENOENT) {
  58                                 handle->pm_errno = ALPM_ERR_NOT_A_DIR;
  59                         } else {
  60                                 handle->pm_errno = ALPM_ERR_SYSTEM;
  61                         }
  62                         return -1;
  63                 }
  64         }
  65
  66         va_start(args, fmt);
  67         ret = _alpm_logaction(handle, fmt, args);
  68         va_end(args);
  69
  70         /* TODO We should add a prefix to log strings depending on who called us.
  71          * If logaction was called by the frontend:
  72          *   USER: <the frontend log>
  73          * and if called internally:
  74          *   ALPM: <the library log>
  75          * Moreover, the frontend should be able to choose its prefix
  76          * (USER by default?):
  77          *   pacman: "PACMAN"
  78          *   kpacman: "KPACMAN"
  79          * This would allow us to share the log file between several frontends
  80          * and know who does what */
  81         return ret;
  82 }
  83
  84 /** @} */
  85
  86 void _alpm_log(alpm_handle_t *handle, alpm_loglevel_t flag, const char *fmt, ...)
  87 {
  88         va_list args;
  89
  90         if(handle == NULL || handle->logcb == NULL) {
  91                 return;
  92         }
  93
  94         va_start(args, fmt);
  95         handle->logcb(flag, fmt, args);
  96         va_end(args);
  97 }
  98
  99 /* vim: set ts=2 sw=2 noet: */