mpd/src/myfprintf.c

/* the Music Player Daemon (MPD)
 * (c)2003-2004 by Warren Dukes (shank@mercury.chem.pitt.edu)
 * This project's homepage is: http://www.musicpd.org
 *
 * 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
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "myfprintf.h"
#include "interface.h"
#include "path.h"
#include "log.h"

#include <stdarg.h>
#include <sys/param.h>
#include <unistd.h>
#include <sys/select.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>

#define BUFFER_LENGTH	MAXPATHLEN+1024

int myfprintf_stdLogMode = 0;
FILE * myfprintf_out;
FILE * myfprintf_err;
char * myfprintf_outFilename;
char * myfprintf_errFilename;

void blockingWrite(int fd, char * string) {
	int len = strlen(string);
	int ret;

	while(len) {
		ret = write(fd,string,len);
		if(ret<0) {
			if(errno==EAGAIN || errno==EINTR) continue;
			return;
		}
		len-= ret;
		string+= ret;
	}
}

void myfprintfStdLogMode(FILE * out, FILE * err, char * outFilename,
                char * errFilename) 
{
	myfprintf_stdLogMode = 1;
	myfprintf_out = out;
	myfprintf_err = err;
        myfprintf_outFilename = prependCwdToPathDup(outFilename);
        myfprintf_errFilename = prependCwdToPathDup(errFilename);
}

void myfprintf(FILE * fp, char * format, ... ) {
	char buffer[BUFFER_LENGTH+1];
	va_list arglist;
	int fd = fileno(fp);
	int fcntlret;

	memset(buffer,0,BUFFER_LENGTH+1);

	va_start(arglist,format);
	while((fcntlret=fcntl(fd,F_GETFL))==-1 && errno==EINTR);
	if(myfprintf_stdLogMode && (fd==1 || fd==2)) {
		time_t t = time(NULL);
		if(fd==1) fp = myfprintf_out;
		else fp = myfprintf_err;
		strftime(buffer,14,"%b %e %R",localtime(&t));
		blockingWrite(fd,buffer);
		blockingWrite(fd," : ");
		vsnprintf(buffer,BUFFER_LENGTH,format,arglist);
		blockingWrite(fd,buffer);
	}
	else {
		vsnprintf(buffer,BUFFER_LENGTH,format,arglist);
		if(!(fcntlret & O_NONBLOCK) || 
				interfacePrintWithFD(fd,buffer)<0) 
		{
			blockingWrite(fd,buffer);
		}
	}

	va_end(arglist);
}

int myfprintfCloseAndOpenLogFile() {
        if(myfprintf_stdLogMode) {
                while(fclose(myfprintf_out)<0 && errno==EINTR);
                while(fclose(myfprintf_err)<0 && errno==EINTR);
                while((myfprintf_out = fopen(myfprintf_outFilename,"a+"))==NULL
                                && errno==EINTR);
                if(!myfprintf_out) {
                        ERROR("error re-opening log file: %s\n",
                                myfprintf_out);
                        return -1;
                }
                while((myfprintf_err = fopen(myfprintf_errFilename,"a+"))==NULL
                                && errno==EINTR);
                if(!myfprintf_out) {
                        ERROR("error re-opening log file: %s\n",
                                myfprintf_out);
                        return -1;
                }
                while(dup2(fileno(myfprintf_out),1)<0 && errno==EINTR);
                while(dup2(fileno(myfprintf_err),2)<0 && errno==EINTR);
        }

        return 0;
}
/* vim:set shiftwidth=4 tabstop=8 expandtab: */