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v0.8.1
https://github.com/python/cpython
Revision ef582abab461e306ac3fa0ad867b2db564fed3a5 authored by Guido van Rossum on 10 April 2003, 20:30:18 UTC, committed by Guido van Rossum on 10 April 2003, 20:30:18 UTC
PyErr_NormalizeException(): in the type==NULL test, we should simply
return.  Setting an exception can mess with the exception state, and
continuing is definitely wrong (since type is dereferenced later on).
Some code that calls this seems to be prepared for a NULL exception
type, so let's be safe rather than sorry and simply assume there's
nothing to normalize in this case.
1 parent d065a13
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Tip revision: ef582abab461e306ac3fa0ad867b2db564fed3a5 authored by Guido van Rossum on 10 April 2003, 20:30:18 UTC
Backport:
Tip revision: ef582ab
dynload_aix.c

/* Support for dynamic loading of extension modules */

#include <ctype.h>	/*  for isdigit()	  */
#include <errno.h>	/*  for global errno      */
#include <string.h>	/*  for strerror()        */
#include <stdlib.h>	/*  for malloc(), free()  */
#include <sys/ldr.h>

#include "Python.h"
#include "importdl.h"


#ifdef AIX_GENUINE_CPLUSPLUS
#include "/usr/lpp/xlC/include/load.h"
#define aix_load loadAndInit
#else
#define aix_load load
#endif


extern char *Py_GetProgramName(void);

typedef struct Module {
	struct Module *next;
	void          *entry;
} Module, *ModulePtr;

const struct filedescr _PyImport_DynLoadFiletab[] = {
	{".so", "rb", C_EXTENSION},
	{"module.so", "rb", C_EXTENSION},
	{0, 0}
};

static int
aix_getoldmodules(void **modlistptr)
{
	register ModulePtr       modptr, prevmodptr;
	register struct ld_info  *ldiptr;
	register char            *ldibuf;
	register int             errflag, bufsize = 1024;
	register unsigned int    offset;
	char *progname = Py_GetProgramName();
	
	/*
	-- Get the list of loaded modules into ld_info structures.
	*/
	if ((ldibuf = malloc(bufsize)) == NULL) {
		PyErr_SetString(PyExc_ImportError, strerror(errno));
		return -1;
	}
	while ((errflag = loadquery(L_GETINFO, ldibuf, bufsize)) == -1
	       && errno == ENOMEM) {
		free(ldibuf);
		bufsize += 1024;
		if ((ldibuf = malloc(bufsize)) == NULL) {
			PyErr_SetString(PyExc_ImportError, strerror(errno));
			return -1;
		}
	}
	if (errflag == -1) {
		PyErr_SetString(PyExc_ImportError, strerror(errno));
		return -1;
	}
	/*
	-- Make the modules list from the ld_info structures.
	*/
	ldiptr = (struct ld_info *)ldibuf;
	prevmodptr = NULL;
	do {
		if (strstr(progname, ldiptr->ldinfo_filename) == NULL &&
		    strstr(ldiptr->ldinfo_filename, "python") == NULL) {
			/*
			-- Extract only the modules belonging to the main
			-- executable + those containing "python" as a
			-- substring (like the "python[version]" binary or
			-- "libpython[version].a" in case it's a shared lib).
			*/
			offset = (unsigned int)ldiptr->ldinfo_next;
			ldiptr = (struct ld_info *)((char*)ldiptr + offset);
			continue;
		}
		if ((modptr = (ModulePtr)malloc(sizeof(Module))) == NULL) {
			PyErr_SetString(PyExc_ImportError, strerror(errno));
			while (*modlistptr) {
				modptr = (ModulePtr)*modlistptr;
				*modlistptr = (void *)modptr->next;
				free(modptr);
			}
			return -1;
		}
		modptr->entry = ldiptr->ldinfo_dataorg;
		modptr->next  = NULL;
		if (prevmodptr == NULL)
			*modlistptr = (void *)modptr;
		else
			prevmodptr->next = modptr;
		prevmodptr = modptr;
		offset = (unsigned int)ldiptr->ldinfo_next;
		ldiptr = (struct ld_info *)((char*)ldiptr + offset);
	} while (offset);
	free(ldibuf);
	return 0;
}

static int
aix_bindnewmodule(void *newmoduleptr, void *modlistptr)
{
	register ModulePtr modptr;

	/*
	-- Bind the new module with the list of loaded modules.
	*/
	for (modptr = (ModulePtr)modlistptr; modptr; modptr = modptr->next)
		if (loadbind(0, modptr->entry, newmoduleptr) != 0)
			return -1;
	return 0;
}

static void
aix_loaderror(const char *pathname)
{

	char *message[1024], errbuf[1024];
	register int i,j;

	struct errtab { 
		int errNo;
		char *errstr;
	} load_errtab[] = {
		{L_ERROR_TOOMANY,	"too many errors, rest skipped."},
		{L_ERROR_NOLIB,		"can't load library:"},
		{L_ERROR_UNDEF,		"can't find symbol in library:"},
		{L_ERROR_RLDBAD,
		 "RLD index out of range or bad relocation type:"},
		{L_ERROR_FORMAT,	"not a valid, executable xcoff file:"},
		{L_ERROR_MEMBER,
		 "file not an archive or does not contain requested member:"},
		{L_ERROR_TYPE,		"symbol table mismatch:"},
		{L_ERROR_ALIGN,		"text alignment in file is wrong."},
		{L_ERROR_SYSTEM,	"System error:"},
		{L_ERROR_ERRNO,		NULL}
	};

#define LOAD_ERRTAB_LEN	(sizeof(load_errtab)/sizeof(load_errtab[0]))
#define ERRBUF_APPEND(s) strncat(errbuf, s, sizeof(errbuf)-strlen(errbuf)-1)

	PyOS_snprintf(errbuf, sizeof(errbuf), "from module %.200s ", pathname);

	if (!loadquery(L_GETMESSAGES, &message[0], sizeof(message))) {
		ERRBUF_APPEND(strerror(errno));
		ERRBUF_APPEND("\n");
	}
	for(i = 0; message[i] && *message[i]; i++) {
		int nerr = atoi(message[i]);
		for (j=0; j<LOAD_ERRTAB_LEN ; j++) {
		    if (nerr == load_errtab[j].errNo && load_errtab[j].errstr)
			ERRBUF_APPEND(load_errtab[j].errstr);
		}
		while (isdigit(*message[i])) message[i]++ ; 
		ERRBUF_APPEND(message[i]);
		ERRBUF_APPEND("\n");
	}
	errbuf[strlen(errbuf)-1] = '\0';	/* trim off last newline */
	PyErr_SetString(PyExc_ImportError, errbuf); 
	return; 
}


dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
				    const char *pathname, FILE *fp)
{
	dl_funcptr p;

	/*
	-- Invoke load() with L_NOAUTODEFER leaving the imported symbols
	-- of the shared module unresolved. Thus we have to resolve them
	-- explicitly with loadbind. The new module is loaded, then we
	-- resolve its symbols using the list of already loaded modules
	-- (only those that belong to the python executable). Get these
	-- with loadquery(L_GETINFO).
	*/

	static void *staticmodlistptr = NULL;

	if (!staticmodlistptr)
		if (aix_getoldmodules(&staticmodlistptr) == -1)
			return NULL;
	p = (dl_funcptr) aix_load((char *)pathname, L_NOAUTODEFER, 0);
	if (p == NULL) {
		aix_loaderror(pathname);
		return NULL;
	}
	if (aix_bindnewmodule((void *)p, staticmodlistptr) == -1) {
		aix_loaderror(pathname);
		return NULL;
	}

	return p;
}
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