X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~mdw/git/disorder/blobdiff_plain/4942ee7d61bf22ba38bf026c7d05028cb7db0d54..92db088e5b292c1180a090ed369b9851e933e610:/lib/log.c

diff --git a/lib/log.c b/lib/log.c
index 00ec7cd..741059a 100644
--- a/lib/log.c
+++ b/lib/log.c
@@ -1,6 +1,6 @@
 /*
  * This file is part of DisOrder.
- * Copyright (C) 2004-2008 Richard Kettlewell
+ * Copyright (C) 2004-9, 2013 Richard Kettlewell
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -17,17 +17,18 @@
  */
 /** @file lib/log.c @brief Errors and logging
  *
- * All messages are initially emitted by one of the four functions below.
- * debug() is generally invoked via D() so that mostly you just do a test
- * rather than a complete subroutine call.
+ * All messages are initially emitted by one of the four functions
+ * below.  disorder_debug() is generally invoked via D() so that
+ * mostly you just do a test rather than a complete subroutine call.
  *
  * Messages are dispatched via @ref log_default.  This defaults to @ref
  * log_stderr.  daemonize() will turn off @ref log_stderr and use @ref
  * log_syslog instead.
  *
- * fatal() will call exitfn() with a nonzero status.  The default value is
- * exit(), but it should be set to _exit() anywhere but the 'main line' of the
- * program, to guarantee that exit() gets called at most once.
+ * disorder_fatal() will call exitfn() with a nonzero status.  The
+ * default value is exit(), but it should be set to _exit() anywhere
+ * but the 'main line' of the program, to guarantee that exit() gets
+ * called at most once.
  */
 
 #define NO_MEMORY_ALLOCATION
@@ -36,8 +37,19 @@
 #include "common.h"
 
 #include <errno.h>
-#include <syslog.h>
-#include <sys/time.h>
+#include <sys/types.h>
+#if HAVE_SYSLOG_H
+# include <syslog.h>
+#endif
+#if HAVE_SYS_TIME_H
+# include <sys/time.h>
+#endif
+#if HAVE_SYS_SOCKET_H
+# include <sys/socket.h>
+#endif
+#if HAVE_NETDB_H
+# include <netdb.h>
+#endif
 #include <time.h>
 
 #include "log.h"
@@ -155,6 +167,7 @@ static void logfp(int pri, const char *msg, void *user) {
   fputc('\n', fp);
 }
 
+#if HAVE_SYSLOG_H
 /** @brief Log to syslog */
 static void logsyslog(int pri, const char *msg,
 		      void attribute((unused)) *user) {
@@ -163,12 +176,15 @@ static void logsyslog(int pri, const char *msg,
   else
     syslog(pri, "%s:%d: %s", debug_filename, debug_lineno, msg);
 }
+#endif
 
 /** @brief Log output that writes to @c stderr */
 struct log_output log_stderr = { logfp, 0 };
 
+#if HAVE_SYSLOG_H
 /** @brief Log output that sends to syslog */
 struct log_output log_syslog = { logsyslog, 0 };
+#endif
 
 /** @brief Format and log a message */
 static void vlogger(int pri, const char *fmt, va_list ap) {
@@ -189,12 +205,14 @@ static void logger(int pri, const char *fmt, ...) {
 
 /** @brief Format and log a message
  * @param pri Message priority (as per syslog)
+ * @param ec Error class
  * @param fmt Format string
  * @param errno_value Errno value to include as a string, or 0
  * @param ap Argument list
  */
-void elog(int pri, int errno_value, const char *fmt, va_list ap) {
+void elog(int pri, enum error_class ec, int errno_value, const char *fmt, va_list ap) {
   char buffer[1024];
+  char errbuf[1024];
 
   if(errno_value == 0)
     vlogger(pri, fmt, ap);
@@ -202,7 +220,8 @@ void elog(int pri, int errno_value, const char *fmt, va_list ap) {
     memset(buffer, 0, sizeof buffer);
     byte_vsnprintf(buffer, sizeof buffer, fmt, ap);
     buffer[sizeof buffer - 1] = 0;
-    logger(pri, "%s: %s", buffer, strerror(errno_value));
+    logger(pri, "%s: %s", buffer,
+           format_error(ec, errno_value, errbuf, sizeof errbuf));
   }
 }
 
@@ -215,7 +234,22 @@ void disorder_fatal(int errno_value, const char *msg, ...) {
   va_list ap;
 
   va_start(ap, msg);
-  elog(LOG_CRIT, errno_value, msg, ap);
+  elog(LOG_CRIT, ec_errno, errno_value, msg, ap);
+  va_end(ap);
+  if(getenv("DISORDER_FATAL_ABORT")) abort();
+  exitfn(EXIT_FAILURE);
+}
+
+/** @brief Log an error and quit
+ *
+ * If @c ${DISORDER_FATAL_ABORT} is defined (as anything) then the process
+ * is aborted, so you can get a backtrace.
+ */
+void disorder_fatal_ec(enum error_class ec, int errno_value, const char *msg, ...) {
+  va_list ap;
+
+  va_start(ap, msg);
+  elog(LOG_CRIT, ec, errno_value, msg, ap);
   va_end(ap);
   if(getenv("DISORDER_FATAL_ABORT")) abort();
   exitfn(EXIT_FAILURE);
@@ -226,7 +260,16 @@ void disorder_error(int errno_value, const char *msg, ...) {
   va_list ap;
 
   va_start(ap, msg);
-  elog(LOG_ERR, errno_value, msg, ap);
+  elog(LOG_ERR, ec_errno, errno_value, msg, ap);
+  va_end(ap);
+}
+
+/** @brief Log an error */
+void disorder_error_ec(enum error_class ec, int errno_value, const char *msg, ...) {
+  va_list ap;
+
+  va_start(ap, msg);
+  elog(LOG_ERR, ec, errno_value, msg, ap);
   va_end(ap);
 }
 
@@ -235,7 +278,7 @@ void disorder_info(const char *msg, ...) {
   va_list ap;
 
   va_start(ap, msg);
-  elog(LOG_INFO, 0, msg, ap);
+  elog(LOG_INFO, ec_none, 0, msg, ap);
   va_end(ap);
 }
 
@@ -256,6 +299,27 @@ void set_progname(char **argv) {
     progname = argv[0];
 }
 
+/** @brief Format an error string
+ * @param ec Error class
+ * @param err Error code (interpretation defined by @p ec)
+ * @param buffer Output buffer
+ * @param bufsize Size of output buffer
+ * @return Pointer to error string
+ *
+ * The return value may or may not be @p buffer.
+ */
+#pragma GCC diagnostic ignored "-Wunused-parameter"
+const char *format_error(enum error_class ec, int err, char buffer[], size_t bufsize) {
+  switch(ec) {
+  default:
+    return strerror(err);
+  case ec_getaddrinfo:
+    return gai_strerror(err);
+  case ec_none:
+    return "(none)";
+  }
+}
+
 /*
 Local Variables:
 c-basic-offset:2