lib/libalpm/log.c

   1 /*
   2  *  log.c
   3  *
   4  *  Copyright (c) 2006-2012 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 <stdio.h>
  22 #include <stdarg.h>
  23 #include <errno.h>
  24
  25 /* libalpm */
  26 #include "log.h"
  27 #include "handle.h"
  28 #include "util.h"
  29 #include "alpm.h"
  30
  31 /** \addtogroup alpm_log Logging Functions
  32  * @brief Functions to log using libalpm
  33  * @{
  34  */
  35
  36 /** A printf-like function for logging.
  37  * @param handle the context handle
  38  * @param fmt output format
  39  * @return 0 on success, -1 on error (pm_errno is set accordingly)
  40  */
  41 int SYMEXPORT alpm_logaction(alpm_handle_t *handle, const char *fmt, ...)
  42 {
  43         int ret;
  44         va_list args;
  45
  46         ASSERT(handle != NULL, return -1);
  47
  48         /* check if the logstream is open already, opening it if needed */
  49         if(handle->logstream == NULL) {
  50                 handle->logstream = fopen(handle->logfile, "a");
  51                 /* if we couldn't open it, we have an issue */
  52                 if(handle->logstream == NULL) {
  53                         if(errno == EACCES) {
  54                                 handle->pm_errno = ALPM_ERR_BADPERMS;
  55                         } else if(errno == ENOENT) {
  56                                 handle->pm_errno = ALPM_ERR_NOT_A_DIR;
  57                         } else {
  58                                 handle->pm_errno = ALPM_ERR_SYSTEM;
  59                         }
  60                         return -1;
  61                 }
  62         }
  63
  64         va_start(args, fmt);
  65         ret = _alpm_logaction(handle, fmt, args);
  66         va_end(args);
  67
  68         /* TODO We should add a prefix to log strings depending on who called us.
  69          * If logaction was called by the frontend:
  70          *   USER: <the frontend log>
  71          * and if called internally:
  72          *   ALPM: <the library log>
  73          * Moreover, the frontend should be able to choose its prefix
  74          * (USER by default?):
  75          *   pacman: "PACMAN"
  76          *   kpacman: "KPACMAN"
  77          * This would allow us to share the log file between several frontends
  78          * and know who does what */
  79         return ret;
  80 }
  81
  82 /** @} */
  83
  84 void _alpm_log(alpm_handle_t *handle, alpm_loglevel_t flag, const char *fmt, ...)
  85 {
  86         va_list args;
  87
  88         if(handle == NULL || handle->logcb == NULL) {
  89                 return;
  90         }
  91
  92         va_start(args, fmt);
  93         handle->logcb(flag, fmt, args);
  94         va_end(args);
  95 }
  96
  97 /* vim: set ts=2 sw=2 noet: */