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/*
* License: BSD-style license
* Copyright: Radek Podgorny <radek@podgorny.cz>,
* Bernd Schubert <bernd.schubert@fastmail.fm>
*/
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <pthread.h>
#include "opts.h"
#include "debug.h"
static char default_debug_path[] = "./unionfs_debug.log";
static pthread_rwlock_t file_lock = PTHREAD_RWLOCK_INITIALIZER;
FILE* dbgfile = NULL;
int debug_init(void) {
FILE* old_dbgfile = dbgfile;
pthread_rwlock_wrlock(&file_lock); // LOCK file
pthread_rwlock_rdlock(&uopt.dbgpath_lock); // LOCK string
char *dbgpath = uopt.dbgpath;
if (!dbgpath) dbgpath = default_debug_path;
printf("Debug mode, log will be written to %s\n", dbgpath);
dbgfile = fopen(dbgpath, "w");
int res = 0;
if (!dbgfile) {
printf("Failed to open %s for writing: %s.\nAborting!\n",
dbgpath, strerror(errno));
dbgfile = old_dbgfile; // we can re-use the old file
res = 2;
} else if (old_dbgfile)
fclose(old_dbgfile);
setlinebuf(dbgfile); // line buffering
pthread_rwlock_unlock(&uopt.dbgpath_lock); // UNLOCK string
pthread_rwlock_unlock(&file_lock); // UNLOCK file
return res;
}
/**
* Read-lock dbgfile and return it.
*/
FILE* get_dbgfile(void)
{
pthread_rwlock_rdlock(&file_lock);
return dbgfile;
}
/**
* Unlock dbgfile
*/
void put_dbgfile(void)
{
pthread_rwlock_unlock(&file_lock);
}
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