newlib/winsup/cygwin/syslog.cc

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/* syslog.cc
Copyright 1996, 1997, 1998 Cygnus Solutions.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
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#include <stdlib.h>
#include <stdio.h>
#include <syslog.h>
#include <stdarg.h>
#include <unistd.h>
#include "security.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygerrno.h"
#include "cygheap.h"
#include "thread.h"
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/* FIXME: These should probably be in the registry. */
/* FIXME: The Win95 path should be whatever slash is */
#define WIN95_EVENT_LOG_PATH "C:\\CYGWIN_SYSLOG.TXT"
#define CYGWIN_LOG_NAME "Cygwin"
/*
* Utility function to help enable moving
* WIN95_EVENT_LOG_PATH into registry later.
*/
static const char *
get_win95_event_log_path ()
{
return WIN95_EVENT_LOG_PATH;
}
/* FIXME: For MT safe code these will need to be replaced */
#ifdef _MT_SAFE
#define process_ident _reent_winsup()->_process_ident
#define process_logopt _reent_winsup()->_process_logopt
#define process_facility _reent_winsup()->_process_facility
/* Default priority logmask */
#define process_logmask _reent_winsup()->_process_logmask
#else
static char *process_ident = 0;
static int process_logopt = 0;
static int process_facility = 0;
/* Default priority logmask */
static int process_logmask = LOG_UPTO (LOG_DEBUG);
#endif
/*
* openlog: save the passed args. Don't open the
* system log (NT) or log file (95) yet.
*/
extern "C"
void
openlog (const char *ident, int logopt, int facility)
{
debug_printf ("openlog called with (%s, %d, %d)",
ident ? ident : "<NULL>", logopt, facility);
if (process_ident != NULL)
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{
free (process_ident);
process_ident = 0;
}
if (ident)
{
process_ident = (char *) malloc (strlen (ident) + 1);
if (process_ident == NULL)
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{
debug_printf ("failed to allocate memory for process_ident");
return;
}
strcpy (process_ident, ident);
}
process_logopt = logopt;
process_facility = facility;
}
/* setlogmask: set the log priority mask and return previous mask.
If maskpri is zero, just return previous. */
int
setlogmask (int maskpri)
{
if (maskpri == 0)
return process_logmask;
int old_mask = process_logmask;
process_logmask = maskpri & LOG_PRIMASK;
return old_mask;
}
/* Private class used to handle formatting of syslog message */
/* It is named pass_handler because it does a two-pass handling of log
strings. The first pass counts the length of the string, and the second
one builds the string. */
class pass_handler
{
private:
FILE *fp_;
char *message_;
int total_len_;
void shutdown ();
/* Explicitly disallow copies */
pass_handler (const pass_handler &);
pass_handler & operator = (const pass_handler &);
public:
pass_handler ();
~pass_handler ();
int initialize (int);
int print (const char *,...);
int print_va (const char *, va_list);
char *get_message () const { return message_; }
void set_message (char *s) { message_ = s; *message_ = '\0'; }
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};
pass_handler::pass_handler () : fp_ (0), message_ (0), total_len_ (0)
{
;
}
pass_handler::~pass_handler ()
{
shutdown ();
}
void
pass_handler::shutdown ()
{
if (fp_ != NULL)
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{
fclose (fp_);
fp_ = 0;
}
}
int
pass_handler::initialize (int pass_number)
{
shutdown ();
if (pass_number)
return total_len_ + 1;
fp_ = fopen ("/dev/null", "wb");
if (fp_ == NULL)
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{
debug_printf ("failed to open /dev/null");
return -1;
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}
total_len_ = 0;
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return 0;
}
int
pass_handler::print (const char *fmt, ...)
{
va_list ap;
va_start (ap, fmt);
int ret = print_va (fmt, ap);
va_end (ap);
return ret;
}
int
pass_handler::print_va (const char *fmt, va_list list)
{
if (fp_ != NULL)
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{
int len = vfprintf (fp_, fmt, list);
if (len < 0)
return -1;
total_len_ += len;
return 0;
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}
else if (message_ != NULL)
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{
char *printpos = &message_[strlen (message_)];
vsprintf (printpos, fmt, list);
return 0;
}
debug_printf ("FAILURE ! fp_ and message_ both 0!! ");
return -1;
}
/*
* syslog: creates the log message and writes to system
* log (NT) or log file (95). FIXME. WinNT log error messages
* don't look pretty, but in order to fix this we have to
* embed resources in the code and tell the NT registry
* where we are, blech (what happens if we move ?).
* We could, however, add the resources in Cygwin and
* always point to that.
*/
extern "C"
void
syslog (int priority, const char *message, ...)
{
debug_printf ("%x %s", priority, message);
/* If the priority fails the current mask, reject */
if (((priority & LOG_PRIMASK) & process_logmask) == 0)
{
debug_printf ("failing message %x due to priority mask %x",
priority, process_logmask);
return;
}
/* Translate %m in the message to error text */
char *errtext = strerror (get_errno ());
int errlen = strlen (errtext);
int numfound = 0;
for (const char *cp = message; *cp; cp++)
if (*cp == '%' && cp[1] == 'm')
numfound++;
char *newmessage = (char *) alloca (strlen (message) +
(errlen * numfound) + 1);
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if (newmessage == NULL)
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{
debug_printf ("failed to allocate newmessage");
return;
}
char *dst = newmessage;
for (const char *cp2 = message; *cp2; cp2++)
if (*cp2 == '%' && cp2[1] == 'm')
{
cp2++;
strcpy (dst, errtext);
while (*dst)
dst++;
}
else
*dst++ = *cp2;
*dst = '\0';
message = newmessage;
/* Work out the priority type - we ignore the facility for now.. */
WORD eventType;
switch (LOG_PRI (priority))
{
case LOG_ERR:
eventType = EVENTLOG_ERROR_TYPE;
break;
case LOG_WARNING:
eventType = EVENTLOG_WARNING_TYPE;
break;
case LOG_INFO:
eventType = EVENTLOG_INFORMATION_TYPE;
break;
default:
eventType = EVENTLOG_ERROR_TYPE;
break;
}
/* We need to know how long the buffer needs to be.
The only legal way I can see of doing this is to
do a vfprintf to /dev/null, and count the bytes
output, then do it again to a malloc'ed string. This
is ugly, slow, but prevents core dumps :-).
*/
va_list ap;
pass_handler pass;
for (int pass_number = 0; pass_number < 2; ++pass_number)
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{
int n = pass.initialize (pass_number);
if (n == -1)
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return;
else if (n > 0)
pass.set_message ((char *) alloca (n));
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/* Deal with ident_string */
if (process_ident != NULL)
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{
if (pass.print ("%s : ", process_ident) == -1)
return;
}
if (process_logopt & LOG_PID)
{
if (pass.print ("Win32 Process Id = 0x%X : Cygwin Process Id = 0x%X : ",
GetCurrentProcessId(), getpid ()) == -1)
return;
}
if (!iswinnt)
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{
/* Add a priority string - not needed for NT
as NT has its own priority codes. */
switch (LOG_PRI (priority))
{
case LOG_ERR:
pass.print ("%s : ", "LOG_ERR");
break;
case LOG_WARNING:
pass.print ("%s : ", "LOG_WARNING");
break;
case LOG_INFO:
pass.print ("%s : ", "LOG_INFO");
break;
default:
pass.print ("%s : ", "LOG_ERR");
break;
}
}
/* Print out the variable part */
va_start (ap, message);
if (pass.print_va (message, ap) == -1)
return;
va_end (ap);
}
const char *msg_strings[1];
char *total_msg = pass.get_message ();
int len = strlen (total_msg);
if (len != 0 && (total_msg[len - 1] == '\n'))
total_msg[len - 1] = '\0';
msg_strings[0] = total_msg;
if (iswinnt)
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{
/* For NT, open the event log and send the message */
HANDLE hEventSrc = RegisterEventSourceA (NULL, (process_ident != NULL) ?
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process_ident : CYGWIN_LOG_NAME);
if (hEventSrc == NULL)
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{
debug_printf ("RegisterEventSourceA failed with %E");
return;
}
ReportEventA (hEventSrc, eventType, 0, 0,
cygheap->user.sid (), 1, 0, msg_strings, NULL);
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DeregisterEventSource (hEventSrc);
}
else
{
/* Under Windows 95, append the message to the log file */
FILE *fp = fopen (get_win95_event_log_path (), "a");
if (fp == NULL)
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{
debug_printf ("failed to open file %s",
get_win95_event_log_path ());
return;
}
/* Now to prevent several syslog messages from being
interleaved, we must lock the first byte of the file
This works on Win32 even if we created the file above.
*/
HANDLE fHandle = cygheap->fdtab[fileno (fp)]->get_handle ();
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if (LockFile (fHandle, 0, 0, 1, 0) == FALSE)
{
debug_printf ("failed to lock file %s", get_win95_event_log_path());
fclose (fp);
return;
}
fputs (msg_strings[0], fp);
fputc ('\n', fp);
UnlockFile (fHandle, 0, 0, 1, 0);
if (ferror (fp))
{
debug_printf ("error in writing syslog");
}
fclose (fp);
}
}
extern "C"
void
closelog (void)
{
;
}