cpython/Python/dynload_aix.c at 3.8 · python-emscripten/cpython · GitHub

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/* Support for dynamic loading of extension modules */

#include "Python.h"

#include "importdl.h"

#include <errno.h> /* for global errno */

#include <string.h> /* for strerror() */

#include <stdlib.h> /* for malloc(), free() */

#include <sys/ldr.h>

#ifdef AIX_GENUINE_CPLUSPLUS

#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 char *_PyImport_DynLoadFiletab[] = {".so", NULL};

static int

aix_getoldmodules(void **modlistptr)

{

ModulePtr modptr, prevmodptr;

struct ld_info *ldiptr;

char *ldibuf;

int errflag, bufsize = 1024;

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 void

aix_loaderror(const char *pathname)

{

char *message[1024], errbuf[1024];

PyObject *pathname_ob = NULL;

PyObject *errbuf_ob = NULL;

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 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 < Py_ARRAY_LENGTH(load_errtab); j++) {

if (nerr == load_errtab[j].errNo && load_errtab[j].errstr)

ERRBUF_APPEND(load_errtab[j].errstr);

}

while (Py_ISDIGIT(Py_CHARMASK(*message[i]))) message[i]++ ;

ERRBUF_APPEND(message[i]);

ERRBUF_APPEND("\n");

}

errbuf[strlen(errbuf)-1] = '\0'; /* trim off last newline */

pathname_ob = PyUnicode_FromString(pathname);

errbuf_ob = PyUnicode_FromString(errbuf);

PyErr_SetImportError(errbuf_ob, NULL, pathname);

Py_DECREF(pathname_ob);

Py_DECREF(errbuf_ob);

return;

}

dl_funcptr _PyImport_FindSharedFuncptr(const char *prefix,

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;

}

return p;

}

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