[PATCH v3 02/14] mingw: implement syslog

[Erik Faye-Lund <kusmabite@gmail.com>]

From: Mike Pape <dotzenlabs@gmail.com>

Syslog does not usually exist on Windows, so we implement our own
using Window's ReportEvent mechanism.

Signed-off-by: Mike Pape <dotzenlabs@gmail.com>
Signed-off-by: Erik Faye-Lund <kusmabite@gmail.com>
---
 compat/mingw.c    |   60 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 compat/mingw.h    |   15 +++++++++++++
 daemon.c          |    2 -
 git-compat-util.h |    1 +
 4 files changed, 76 insertions(+), 2 deletions(-)

diff --git a/compat/mingw.c b/compat/mingw.c
index 563ef1f..cc5eb2c 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -1431,6 +1431,66 @@ int sigaction(int sig, struct sigaction *in, struct sigaction *out)
 	return 0;
 }
 
+static HANDLE ms_eventlog;
+
+void openlog(const char *ident, int logopt, int facility)
+{
+	if (ms_eventlog)
+		return;
+
+	ms_eventlog = RegisterEventSourceA(NULL, ident);
+
+	if (!ms_eventlog)
+		warning("RegisterEventSource() failed: %lu", GetLastError());
+}
+
+void syslog(int priority, const char *fmt, const char *arg)
+{
+	WORD logtype;
+
+	if (!ms_eventlog)
+		return;
+
+	if (strcmp(fmt, "%s")) {
+		warning("format string of syslog() not implemented");
+		return;
+	}
+
+	switch (priority) {
+	case LOG_EMERG:
+	case LOG_ALERT:
+	case LOG_CRIT:
+	case LOG_ERR:
+		logtype = EVENTLOG_ERROR_TYPE;
+		break;
+
+	case LOG_WARNING:
+		logtype = EVENTLOG_WARNING_TYPE;
+		break;
+
+	case LOG_NOTICE:
+	case LOG_INFO:
+	case LOG_DEBUG:
+	default:
+		logtype = EVENTLOG_INFORMATION_TYPE;
+		break;
+	}
+
+	/*
+	 * ReportEvent() doesn't handle strings containing %n, where n is
+	 * an integer. Such events must be reformatted by the caller.
+	 */
+	ReportEventA(ms_eventlog,
+	    logtype,
+	    0,
+	    0,
+	    NULL,
+	    1,
+	    0,
+	    (const char **)&arg,
+	    NULL);
+}
+
 #undef signal
 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
 {
diff --git a/compat/mingw.h b/compat/mingw.h
index a5bde82..bbfcc0c 100644
--- a/compat/mingw.h
+++ b/compat/mingw.h
@@ -51,6 +51,19 @@ typedef int socklen_t;
 #define EAFNOSUPPORT WSAEAFNOSUPPORT
 #define ECONNABORTED WSAECONNABORTED
 
+#define LOG_PID     0x01
+
+#define LOG_EMERG   0
+#define LOG_ALERT   1
+#define LOG_CRIT    2
+#define LOG_ERR     3
+#define LOG_WARNING 4
+#define LOG_NOTICE  5
+#define LOG_INFO    6
+#define LOG_DEBUG   7
+
+#define LOG_DAEMON  (3<<3)
+
 struct passwd {
 	char *pw_name;
 	char *pw_gecos;
@@ -185,6 +198,8 @@ struct passwd *getpwuid(uid_t uid);
 int setitimer(int type, struct itimerval *in, struct itimerval *out);
 int sigaction(int sig, struct sigaction *in, struct sigaction *out);
 int link(const char *oldpath, const char *newpath);
+void openlog(const char *ident, int logopt, int facility);
+void syslog(int priority, const char *fmt, const char *arg);
 
 /*
  * replacements of existing functions
diff --git a/daemon.c b/daemon.c
index d6e20c6..d594375 100644
--- a/daemon.c
+++ b/daemon.c
@@ -5,8 +5,6 @@
 #include "strbuf.h"
 #include "string-list.h"
 
-#include <syslog.h>
-
 #ifndef HOST_NAME_MAX
 #define HOST_NAME_MAX 256
 #endif
diff --git a/git-compat-util.h b/git-compat-util.h
index 2af8d3e..8770854 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -119,6 +119,7 @@
 #include <netdb.h>
 #include <pwd.h>
 #include <inttypes.h>
+#include <syslog.h>
 #if defined(__CYGWIN__)
 #undef _XOPEN_SOURCE
 #include <grp.h>
-- 
1.7.3.1.51.ge462f.dirty