| 1 | /* |
| 2 | * This file is part of DisOrder. |
| 3 | * Copyright (C) 2004, 2005 Richard Kettlewell |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, but |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
| 18 | * USA |
| 19 | */ |
| 20 | |
| 21 | #ifndef LOG_H |
| 22 | #define LOG_H |
| 23 | |
| 24 | /* All messages are initially emitted by one of the four functions below. |
| 25 | * debug() is generally invoked via D() so that mostly you just do a test |
| 26 | * rather than a complete subroutine call. |
| 27 | * |
| 28 | * Messages are dispatched via log_default. This defaults to log_stderr. |
| 29 | * daemonize() will turn off log_stderr and use log_syslog instead. |
| 30 | * |
| 31 | * fatal() will call exitfn() with a nonzero status. The default value is |
| 32 | * exit(), but it should be set to _exit() anywhere but the 'main line' of the |
| 33 | * program, to guarantee that exit() gets called at most once. |
| 34 | */ |
| 35 | |
| 36 | #include <stdarg.h> |
| 37 | |
| 38 | struct log_output; |
| 39 | |
| 40 | void set_progname(char **argv); |
| 41 | /* set progname from argv[0] */ |
| 42 | |
| 43 | void elog(int pri, int errno_value, const char *fmt, va_list ap); |
| 44 | /* internals of fatal/error/info/debug */ |
| 45 | |
| 46 | void fatal(int errno_value, const char *msg, ...) attribute((noreturn)) |
| 47 | attribute((format (printf, 2, 3))); |
| 48 | void error(int errno_value, const char *msg, ...) |
| 49 | attribute((format (printf, 2, 3))); |
| 50 | void info(const char *msg, ...) |
| 51 | attribute((format (printf, 1, 2))); |
| 52 | void debug(const char *msg, ...) |
| 53 | attribute((format (printf, 1, 2))); |
| 54 | /* report a message of the given class. @errno_value@ if present an |
| 55 | * non-zero is included. @fatal@ terminates the process. */ |
| 56 | |
| 57 | extern int debugging; |
| 58 | /* set when debugging enabled */ |
| 59 | |
| 60 | extern void (*exitfn)(int) attribute((noreturn)); |
| 61 | /* how to exit the program (for fatal) */ |
| 62 | |
| 63 | extern const char *progname; |
| 64 | /* program name */ |
| 65 | |
| 66 | extern struct log_output log_stderr, log_syslog, *log_default; |
| 67 | /* some typical outputs */ |
| 68 | |
| 69 | extern const char *debug_filename; |
| 70 | extern int debug_lineno; |
| 71 | |
| 72 | #define D(x) do { \ |
| 73 | if(debugging) { \ |
| 74 | debug_filename=__FILE__; \ |
| 75 | debug_lineno=__LINE__; \ |
| 76 | debug x; \ |
| 77 | } \ |
| 78 | } while(0) |
| 79 | |
| 80 | #endif /* LOG_H */ |
| 81 | |
| 82 | /* |
| 83 | Local Variables: |
| 84 | c-basic-offset:2 |
| 85 | comment-column:40 |
| 86 | fill-column:79 |
| 87 | End: |
| 88 | */ |