|
| 1 | +/* |
| 2 | + * Copyright (C) 2018 Marco d'Itri |
| 3 | + * |
| 4 | + * Inspired by log.c from the cowdancer package by James Clarke. |
| 5 | + * |
| 6 | + * This program is free software; you can redistribute it and/or modify |
| 7 | + * it under the terms of the GNU General Public License as published by |
| 8 | + * the Free Software Foundation; either version 2 of the License, or |
| 9 | + * (at your option) any later version. |
| 10 | + * |
| 11 | + * This program is distributed in the hope that it will be useful, |
| 12 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | + * GNU General Public License for more details. |
| 15 | + * |
| 16 | + * You should have received a copy of the GNU General Public License |
| 17 | + * along with this program; if not, write to the Free Software |
| 18 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | + */ |
| 20 | + |
| 21 | +#include <stdio.h> |
| 22 | +#include <stdlib.h> |
| 23 | +#include <unistd.h> |
| 24 | +#include <string.h> |
| 25 | +#include <errno.h> |
| 26 | +#include <syslog.h> |
| 27 | + |
| 28 | +#include "log.h" |
| 29 | +#include "utils.h" |
| 30 | + |
| 31 | +static log_level filter_level = log_info; |
| 32 | + |
| 33 | +/* |
| 34 | + * Return the appropriate file handle (stdout vs. stderr) for the log level. |
| 35 | + */ |
| 36 | +static FILE *file_for_level(log_level level) |
| 37 | +{ |
| 38 | + if (level & log_stderr || filter_level & log_stderr) |
| 39 | + return stderr; |
| 40 | + |
| 41 | + if ((level & LOG_LEVEL_MASK) > log_warning) |
| 42 | + return stdout; |
| 43 | + else |
| 44 | + return stderr; |
| 45 | +} |
| 46 | + |
| 47 | +static void log_doit(log_level level, const char *format, va_list args) |
| 48 | +{ |
| 49 | + static int syslog_initialized; |
| 50 | + |
| 51 | + if ((level & LOG_LEVEL_MASK) > (filter_level & LOG_LEVEL_MASK)) |
| 52 | + return; |
| 53 | + |
| 54 | + if (level & log_syslog || filter_level & log_syslog) { |
| 55 | + if (!syslog_initialized) { |
| 56 | + openlog(NULL, LOG_PID, LOG_DAEMON); |
| 57 | + syslog_initialized = 1; |
| 58 | + } |
| 59 | + |
| 60 | + if (level & log_strerror) { |
| 61 | + int len = strlen(format); |
| 62 | + char *format2; |
| 63 | + |
| 64 | + format2 = NOFAIL(malloc(len + 4 + 1)); |
| 65 | + strcpy(format2, format); |
| 66 | + strcpy(format2 + len, ": %m"); |
| 67 | + vsyslog(level & LOG_LEVEL_MASK, format2, args); |
| 68 | + free(format2); |
| 69 | + } else { |
| 70 | + vsyslog(level & LOG_LEVEL_MASK, format, args); |
| 71 | + } |
| 72 | + return; |
| 73 | + } |
| 74 | + |
| 75 | + vfprintf(file_for_level(level), format, args); |
| 76 | + if (level & log_strerror) |
| 77 | + fprintf(file_for_level(level), ": %s", strerror(errno)); |
| 78 | + fprintf(file_for_level(level), "\n"); |
| 79 | +} |
| 80 | + |
| 81 | +log_level log_get_filter_level(void) |
| 82 | +{ |
| 83 | + return filter_level; |
| 84 | +} |
| 85 | + |
| 86 | +void log_set_options(log_level filter_level_new) |
| 87 | +{ |
| 88 | + filter_level = filter_level_new; |
| 89 | +} |
| 90 | + |
| 91 | +void log_printf(log_level level, const char *format, ...) |
| 92 | +{ |
| 93 | + va_list args; |
| 94 | + |
| 95 | + va_start(args, format); |
| 96 | + log_doit(level, format, args); |
| 97 | + va_end(args); |
| 98 | +} |
| 99 | + |
| 100 | +void log_printf_exit(int status, log_level level, const char *format, ...) |
| 101 | +{ |
| 102 | + va_list args; |
| 103 | + |
| 104 | + va_start(args, format); |
| 105 | + log_doit(level, format, args); |
| 106 | + va_end(args); |
| 107 | + |
| 108 | + exit(status); |
| 109 | +} |
| 110 | + |
| 111 | +void log_printf_err(log_level level, const char *format, ...) |
| 112 | +{ |
| 113 | + va_list args; |
| 114 | + |
| 115 | + va_start(args, format); |
| 116 | + log_doit(level | log_strerror, format, args); |
| 117 | + va_end(args); |
| 118 | +} |
| 119 | + |
| 120 | +void log_printf_err_exit(int status, log_level level, const char *format, ...) |
| 121 | +{ |
| 122 | + va_list args; |
| 123 | + |
| 124 | + va_start(args, format); |
| 125 | + log_doit(level | log_strerror, format, args); |
| 126 | + va_end(args); |
| 127 | + |
| 128 | + exit(status); |
| 129 | +} |
| 130 | + |
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