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Add code to provide useful dynamic-linking error messages on OS X.

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This commit is contained in:
Tom Lane 2003-04-13 01:19:06 +00:00
parent e138630251
commit ff5456feae
1 changed files with 45 additions and 8 deletions
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53
src/backend/port/dynloader/darwin.c
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@ -3,31 +3,35 @@
* available with a PostgreSQL-compatible license. Kudos Wilfredo
* Sánchez <wsanchez@apple.com>.
*
* $Header: /cvsroot/pgsql/src/backend/port/dynloader/darwin.c,v 1.6 2002/10/01 05:06:44 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/port/dynloader/darwin.c,v 1.7 2003/04/13 01:19:06 tgl Exp $
*/
#include "postgres.h"
#include <mach-o/dyld.h>
#include "dynloader.h"
static NSObjectFileImageReturnCode cofiff_result = NSObjectFileImageFailure;
void *
pg_dlopen(char *filename)
{
NSObjectFileImage image;
if (NSCreateObjectFileImageFromFile(filename, &image) !=
NSObjectFileImageSuccess)
cofiff_result = NSCreateObjectFileImageFromFile(filename, &image);
if (cofiff_result != NSObjectFileImageSuccess)
return NULL;
return NSLinkModule(image, filename,
NSLINKMODULE_OPTION_BINDNOW |
NSLINKMODULE_OPTION_RETURN_ON_ERROR);
NSLINKMODULE_OPTION_BINDNOW |
NSLINKMODULE_OPTION_RETURN_ON_ERROR);
}
void
pg_dlclose(void *handle)
{
NSUnLinkModule(handle, FALSE);
return;
}
PGFunction
@ -53,5 +57,38 @@ pg_dlsym(void *handle, char *funcname)
char *
pg_dlerror(void)
{
return "no error message available";
NSLinkEditErrors c;
int errorNumber;
const char *fileName;
const char *errorString = NULL;
switch (cofiff_result)
{
case NSObjectFileImageSuccess:
/* must have failed in NSLinkModule */
NSLinkEditError(&c, &errorNumber, &fileName, &errorString);
if (errorString == NULL || *errorString == '\0')
errorString = "unknown link-edit failure";
break;
case NSObjectFileImageFailure:
errorString = "failed to open object file";
break;
case NSObjectFileImageInappropriateFile:
errorString = "inappropriate object file";
break;
case NSObjectFileImageArch:
errorString = "object file is for wrong architecture";
break;
case NSObjectFileImageFormat:
errorString = "object file has wrong format";
break;
case NSObjectFileImageAccess:
errorString = "insufficient permissions for object file";
break;
default:
errorString = "unknown failure to open object file";
break;
}
return (char *) errorString;
}