gdb/cli/cli-logging.c

   1 /* Command-line output logging for GDB, the GNU debugger.
   2
   3    Copyright (C) 2003-2020 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   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 3 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 #include "defs.h"
  21 #include "gdbcmd.h"
  22 #include "ui-out.h"
  23 #include "interps.h"
  24 #include "cli/cli-style.h"
  25
  26 static char *saved_filename;
  27
  28 static char *logging_filename;
  29 static void
  30 show_logging_filename (struct ui_file *file, int from_tty,
  31                        struct cmd_list_element *c, const char *value)
  32 {
  33   fprintf_filtered (file, _("The current logfile is \"%ps\".\n"),
  34                     styled_string (file_name_style.style (), value));
  35 }
  36
  37 static bool logging_overwrite;
  38
  39 static void
  40 maybe_warn_already_logging ()
  41 {
  42   if (saved_filename)
  43     warning (_("Currently logging to %s.  Turn the logging off and on to "
  44                "make the new setting effective."), saved_filename);
  45 }
  46
  47 static void
  48 set_logging_overwrite (const char *args,
  49                        int from_tty, struct cmd_list_element *c)
  50 {
  51   maybe_warn_already_logging ();
  52 }
  53
  54 static void
  55 show_logging_overwrite (struct ui_file *file, int from_tty,
  56                         struct cmd_list_element *c, const char *value)
  57 {
  58   fprintf_filtered (file,
  59                     _("Whether logging overwrites or "
  60                       "appends to the log file is %s.\n"),
  61                     value);
  62 }
  63
  64 /* Value as configured by the user.  */
  65 static bool logging_redirect;
  66 static bool debug_redirect;
  67
  68 static void
  69 set_logging_redirect (const char *args,
  70                       int from_tty, struct cmd_list_element *c)
  71 {
  72   maybe_warn_already_logging ();
  73 }
  74
  75 static void
  76 show_logging_redirect (struct ui_file *file, int from_tty,
  77                        struct cmd_list_element *c, const char *value)
  78 {
  79   fprintf_filtered (file, _("The logging output mode is %s.\n"), value);
  80 }
  81
  82 /* If we've pushed output files, close them and pop them.  */
  83 static void
  84 pop_output_files (void)
  85 {
  86   current_interp_set_logging (NULL, false, false);
  87
  88   /* Stay consistent with handle_redirections.  */
  89   if (!current_uiout->is_mi_like_p ())
  90     current_uiout->redirect (NULL);
  91 }
  92
  93 /* This is a helper for the `set logging' command.  */
  94 static void
  95 handle_redirections (int from_tty)
  96 {
  97   if (saved_filename != NULL)
  98     {
  99       fprintf_unfiltered (gdb_stdout, "Already logging to %s.\n",
 100                           saved_filename);
 101       return;
 102     }
 103
 104   stdio_file_up log (new no_terminal_escape_file ());
 105   if (!log->open (logging_filename, logging_overwrite ? "w" : "a"))
 106     perror_with_name (_("set logging"));
 107
 108   /* Redirects everything to gdb_stdout while this is running.  */
 109   if (from_tty)
 110     {
 111       if (!logging_redirect)
 112         fprintf_unfiltered (gdb_stdout, "Copying output to %s.\n",
 113                             logging_filename);
 114       else
 115         fprintf_unfiltered (gdb_stdout, "Redirecting output to %s.\n",
 116                             logging_filename);
 117
 118       if (!debug_redirect)
 119         fprintf_unfiltered (gdb_stdout, "Copying debug output to %s.\n",
 120                             logging_filename);
 121       else
 122         fprintf_unfiltered (gdb_stdout, "Redirecting debug output to %s.\n",
 123                             logging_filename);
 124     }
 125
 126   saved_filename = xstrdup (logging_filename);
 127
 128   /* Let the interpreter do anything it needs.  */
 129   current_interp_set_logging (std::move (log), logging_redirect,
 130                               debug_redirect);
 131
 132   /* Redirect the current ui-out object's output to the log.  Use
 133      gdb_stdout, not log, since the interpreter may have created a tee
 134      that wraps the log.  Don't do the redirect for MI, it confuses
 135      MI's ui-out scheme.  Note that we may get here with MI as current
 136      interpreter, but with the current ui_out as a CLI ui_out, with
 137      '-interpreter-exec console "set logging on"'.  */
 138   if (!current_uiout->is_mi_like_p ())
 139     current_uiout->redirect (gdb_stdout);
 140 }
 141
 142 static void
 143 set_logging_on (const char *args, int from_tty)
 144 {
 145   const char *rest = args;
 146
 147   if (rest && *rest)
 148     {
 149       xfree (logging_filename);
 150       logging_filename = xstrdup (rest);
 151     }
 152   handle_redirections (from_tty);
 153 }
 154
 155 static void
 156 set_logging_off (const char *args, int from_tty)
 157 {
 158   if (saved_filename == NULL)
 159     return;
 160
 161   pop_output_files ();
 162   if (from_tty)
 163     fprintf_unfiltered (gdb_stdout, "Done logging to %s.\n", saved_filename);
 164   xfree (saved_filename);
 165   saved_filename = NULL;
 166 }
 167
 168 static void
 169 set_logging_command (const char *args, int from_tty)
 170 {
 171   printf_unfiltered (_("\"set logging\" lets you log output to a file.\n"
 172                        "Usage: set logging on [FILENAME]\n"
 173                        "       set logging off\n"
 174                        "       set logging file FILENAME\n"
 175                        "       set logging overwrite [on|off]\n"
 176                        "       set logging redirect [on|off]\n"));
 177 }
 178
 179 static void
 180 show_logging_command (const char *args, int from_tty)
 181 {
 182   if (saved_filename)
 183     printf_unfiltered (_("Currently logging to \"%s\".\n"), saved_filename);
 184   if (saved_filename == NULL
 185       || strcmp (logging_filename, saved_filename) != 0)
 186     printf_unfiltered (_("Future logs will be written to %s.\n"),
 187                        logging_filename);
 188
 189   if (logging_overwrite)
 190     printf_unfiltered (_("Logs will overwrite the log file.\n"));
 191   else
 192     printf_unfiltered (_("Logs will be appended to the log file.\n"));
 193
 194   if (logging_redirect)
 195     printf_unfiltered (_("Output will be sent only to the log file.\n"));
 196   else
 197     printf_unfiltered (_("Output will be logged and displayed.\n"));
 198
 199   if (debug_redirect)
 200     printf_unfiltered (_("Debug output will be sent only to the log file.\n"));
 201   else
 202     printf_unfiltered (_("Debug output will be logged and displayed.\n"));
 203 }
 204
 205 void
 206 _initialize_cli_logging (void)
 207 {
 208   static struct cmd_list_element *set_logging_cmdlist, *show_logging_cmdlist;
 209
 210   add_prefix_cmd ("logging", class_support, set_logging_command,
 211                   _("Set logging options."), &set_logging_cmdlist,
 212                   "set logging ", 0, &setlist);
 213   add_prefix_cmd ("logging", class_support, show_logging_command,
 214                   _("Show logging options."), &show_logging_cmdlist,
 215                   "show logging ", 0, &showlist);
 216   add_setshow_boolean_cmd ("overwrite", class_support, &logging_overwrite, _("\
 217 Set whether logging overwrites or appends to the log file."), _("\
 218 Show whether logging overwrites or appends to the log file."), _("\
 219 If set, logging overrides the log file."),
 220                            set_logging_overwrite,
 221                            show_logging_overwrite,
 222                            &set_logging_cmdlist, &show_logging_cmdlist);
 223   add_setshow_boolean_cmd ("redirect", class_support, &logging_redirect, _("\
 224 Set the logging output mode."), _("\
 225 Show the logging output mode."), _("\
 226 If redirect is off, output will go to both the screen and the log file.\n\
 227 If redirect is on, output will go only to the log file."),
 228                            set_logging_redirect,
 229                            show_logging_redirect,
 230                            &set_logging_cmdlist, &show_logging_cmdlist);
 231   add_setshow_boolean_cmd ("debugredirect", class_support,
 232                            &debug_redirect, _("\
 233 Set the logging debug output mode."), _("\
 234 Show the logging debug output mode."), _("\
 235 If debug redirect is off, debug will go to both the screen and the log file.\n\
 236 If debug redirect is on, debug will go only to the log file."),
 237                            set_logging_redirect,
 238                            show_logging_redirect,
 239                            &set_logging_cmdlist, &show_logging_cmdlist);
 240   add_setshow_filename_cmd ("file", class_support, &logging_filename, _("\
 241 Set the current logfile."), _("\
 242 Show the current logfile."), _("\
 243 The logfile is used when directing GDB's output."),
 244                             NULL,
 245                             show_logging_filename,
 246                             &set_logging_cmdlist, &show_logging_cmdlist);
 247   add_cmd ("on", class_support, set_logging_on,
 248            _("Enable logging."), &set_logging_cmdlist);
 249   add_cmd ("off", class_support, set_logging_off,
 250            _("Disable logging."), &set_logging_cmdlist);
 251
 252   logging_filename = xstrdup ("gdb.txt");
 253 }