uspace/lib/c/generic/io/logctl.c

   1 /*
   2  * Copyright (c) 2012 Vojtech Horky
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * - Redistributions of source code must retain the above copyright
  10  *   notice, this list of conditions and the following disclaimer.
  11  * - Redistributions in binary form must reproduce the above copyright
  12  *   notice, this list of conditions and the following disclaimer in the
  13  *   documentation and/or other materials provided with the distribution.
  14  * - The name of the author may not be used to endorse or promote products
  15  *   derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 /** @addtogroup libc
  30  * @{
  31  */
  32
  33 #include <assert.h>
  34 #include <errno.h>
  35 #include <io/logctl.h>
  36 #include <ipc/logger.h>
  37 #include <sysinfo.h>
  38 #include <ns.h>
  39 #include <str.h>
  40 #include <vfs/vfs.h>
  41
  42 /** IPC session with the logger service. */
  43 static async_sess_t *logger_session = NULL;
  44
  45 static int start_logger_exchange(async_exch_t **exchange_out)
  46 {
  47         assert(exchange_out != NULL);
  48
  49         if (logger_session == NULL) {
  50                 logger_session = service_connect_blocking(SERVICE_LOGGER,
  51                     INTERFACE_LOGGER_CONTROL, 0);
  52                 if (logger_session == NULL)
  53                         return ENOMEM;
  54         }
  55
  56         assert(logger_session != NULL);
  57
  58         async_exch_t *exchange = async_exchange_begin(logger_session);
  59         if (exchange == NULL)
  60                 return ENOMEM;
  61
  62         *exchange_out = exchange;
  63
  64         return EOK;
  65 }
  66
  67 /** Set default reported log level (global setting).
  68  *
  69  * This setting affects all logger clients whose reporting level was
  70  * not yet changed.
  71  *
  72  * If logging level of client A is changed with logctl_set_log_level()
  73  * to some level, this call will have no effect at that client's reporting
  74  * level. Even if the actual value of the reporting level of client A is
  75  * the same as current (previous) default log level.
  76  *
  77  * @param new_level New reported logging level.
  78  * @return Error code of the conversion or EOK on success.
  79  */
  80 int logctl_set_default_level(log_level_t new_level)
  81 {
  82         async_exch_t *exchange = NULL;
  83         int rc = start_logger_exchange(&exchange);
  84         if (rc != EOK)
  85                 return rc;
  86
  87         rc = (int) async_req_1_0(exchange,
  88             LOGGER_CONTROL_SET_DEFAULT_LEVEL, new_level);
  89
  90         async_exchange_end(exchange);
  91
  92         return rc;
  93 }
  94
  95 /** Set reported log level of a single log.
  96  *
  97  * @see logctl_set_default_level
  98  *
  99  * @param logname Log name.
 100  * @param new_level New reported logging level.
 101  * @return Error code of the conversion or EOK on success.
 102  */
 103 int logctl_set_log_level(const char *logname, log_level_t new_level)
 104 {
 105         async_exch_t *exchange = NULL;
 106         int rc = start_logger_exchange(&exchange);
 107         if (rc != EOK)
 108                 return rc;
 109
 110         aid_t reg_msg = async_send_1(exchange, LOGGER_CONTROL_SET_LOG_LEVEL,
 111             new_level, NULL);
 112         rc = async_data_write_start(exchange, logname, str_size(logname));
 113         sysarg_t reg_msg_rc;
 114         async_wait_for(reg_msg, &reg_msg_rc);
 115
 116         async_exchange_end(exchange);
 117
 118         if (rc != EOK)
 119                 return rc;
 120
 121         return (int) reg_msg_rc;
 122 }
 123
 124 /** Set logger's VFS root.
 125  *
 126  * @return Error code or EOK on success.
 127  */
 128 int logctl_set_root(void)
 129 {
 130         async_exch_t *exchange = NULL;
 131         int rc = start_logger_exchange(&exchange);
 132         if (rc != EOK)
 133                 return rc;
 134
 135         aid_t reg_msg = async_send_0(exchange, LOGGER_CONTROL_SET_ROOT, NULL);
 136         async_exch_t *vfs_exch = vfs_exchange_begin();
 137         rc = vfs_pass_handle(vfs_exch, vfs_root(), exchange);
 138         vfs_exchange_end(vfs_exch);
 139         sysarg_t reg_msg_rc;
 140         async_wait_for(reg_msg, &reg_msg_rc);
 141
 142         async_exchange_end(exchange);
 143
 144         if (rc != EOK)
 145                 return rc;
 146
 147         return (int) reg_msg_rc;
 148 }
 149
 150 /** @}
 151  */