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