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/*********************************************************************
* Copyright 1993, UCAR/Unidata
* See netcdf/COPYRIGHT file for copying and redistribution conditions.
* Derived from poco library from Boost Software: see nccpoco/LICENSE file.
*********************************************************************/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#ifdef HAVE_DLFCN_H
#include <dlfcn.h>
#endif
#ifdef USE_MUTEX
#include <pthread.h>
#endif
#include "netcdf.h"
#include "ncpoco.h"
#include "ncpathmgr.h"
#undef DEBUG
/* Note: cygwin is missing RTLD_LOCAL, set it to 0 */
#if !defined(RTLD_LOCAL)
#define RTLD_LOCAL 0
#endif
#if !defined(RTLD_GLOBAL)
#define RTLD_GLOBAL 0
#endif
#if !defined(RTLD_LAZY)
#define RTLD_LAZY 1
#endif
#if !defined(RTLD_NOW)
#define RTLD_NOW 2
#endif
#ifdef USE_MUTEX
static pthread_mutex_t mutex;
#endif
static void
ncperr(const char* fcn, NCPSharedLib* lib)
{
const char* msg = dlerror();
lib->err.msg[0] = '\0';
if(msg != NULL) {
strlcat(lib->err.msg,fcn,sizeof(lib->err.msg));
strlcat(lib->err.msg,": ",sizeof(lib->err.msg));
strlcat(lib->err.msg,msg,sizeof(lib->err.msg));
#ifdef DEBUG
fprintf(stderr,">>> %s\n",lib->err.msg);
#endif
}
}
int
ncp_unix_initialize(void)
{
int ret = 1;
#ifdef USE_MUTEX
pthread_mutexattr_t attr;
pthread_mutexattr_init(&attr);
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_NORMAL);
if(pthread_mutex_init(&mutex, &attr)) {
fprintf(stderr,"cp_unix: Cannot create mutext\n");
ret = 1;
}
pthread_mutexattr_destroy(&attr);
#endif
return ret;
}
int
ncp_unix_finalize(void)
{
#ifdef USE_MUTEX
pthread_mutex_destroy(&mutex);
#endif
return 1;
}
/**************************************************/
#ifdef USE_MUTEX
static void lock(void) {pthread_mutex_lock(&mutex);}
#else
#define lock()
#endif
#ifdef USE_MUTEX
static void unlock(void) {pthread_mutex_unlock(&mutex);}
#else
#define unlock()
#endif
/**************************************************/
static int
init(NCPSharedLib* lib)
{
int ret = NC_NOERR;
return ret;
}
static int
reclaim(NCPSharedLib* lib)
{
int ret = NC_NOERR;
return ret;
}
static int
load(NCPSharedLib* lib , const char* path0, int flags)
{
int ret = NC_NOERR;
int realflags = RTLD_LAZY; /* versus RTLD_NOW which does not appear to work */
char* path = NULL;
if((path = NCpathcvt(path0))==NULL) {ret = NC_ENOMEM; goto done;}
lock();
if(lib->state.handle != NULL)
{ret = NC_EEXIST; goto ldone;}
lib->path = nulldup(path);
lib->flags = flags;
if(flags & NCP_LOCAL)
realflags |= RTLD_LOCAL;
else
realflags |= RTLD_GLOBAL;
lib->state.flags = realflags;
lib->state.handle = dlopen(lib->path, lib->state.flags);
if(lib->state.handle == NULL) {
ncperr("dlopen",lib);
ret = NC_ENOTFOUND;
goto ldone;
}
ldone:
unlock();
done:
nullfree(path);
return ret;
}
static int
unload(NCPSharedLib* lib)
{
int ret = NC_NOERR;
lock();
if(lib->state.handle != NULL) {
dlclose(lib->state.handle);
lib->state.handle = NULL;
}
unlock();
return ret;
}
static int
isLoaded(NCPSharedLib* lib)
{
return lib->state.handle != NULL;
}
static void*
getsymbol(NCPSharedLib* lib, const char* name)
{
void* result = NULL;
lock();
if(lib->state.handle != NULL) {
result = dlsym(lib->state.handle, name);
if(result == NULL) {
ncperr("dlsym",lib);
}
}
unlock();
return result;
}
static const char*
getpath(NCPSharedLib* lib)
{
return lib->path;
}
struct NCPAPI ncp_unix_api = {
init,
reclaim,
load,
unload,
isLoaded,
getsymbol,
getpath,
};
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