| 1 | /* -*- C -*- ***********************************************
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| 2 | Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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| 3 | The Netherlands.
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| 4 |
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| 5 | All Rights Reserved
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| 6 |
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| 7 | Permission to use, copy, modify, and distribute this software and its
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| 8 | documentation for any purpose and without fee is hereby granted,
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| 9 | provided that the above copyright notice appear in all copies and that
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| 10 | both that copyright notice and this permission notice appear in
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| 11 | supporting documentation, and that the names of Stichting Mathematisch
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| 12 | Centrum or CWI or Corporation for National Research Initiatives or
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| 13 | CNRI not be used in advertising or publicity pertaining to
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| 14 | distribution of the software without specific, written prior
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| 15 | permission.
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| 16 |
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| 17 | While CWI is the initial source for this software, a modified version
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| 18 | is made available by the Corporation for National Research Initiatives
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| 19 | (CNRI) at the Internet address ftp://ftp.python.org.
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| 20 |
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| 21 | STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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| 22 | REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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| 23 | MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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| 24 | CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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| 25 | DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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| 26 | PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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| 27 | TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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| 28 | PERFORMANCE OF THIS SOFTWARE.
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| 29 |
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| 30 | ******************************************************************/
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| 31 |
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| 32 | /* This library implements dlopen() - Unix-like dynamic linking
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| 33 | * emulation functions for OS/2 using DosLoadModule() and company.
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| 34 | */
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| 35 |
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| 36 | #define INCL_DOS
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| 37 | #define INCL_DOSERRORS
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| 38 | #define INCL_DOSSESMGR
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| 39 | #define INCL_WINPROGRAMLIST
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| 40 | #define INCL_WINFRAMEMGR
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| 41 | #include <os2.h>
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| 42 |
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| 43 | #include <stdio.h>
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| 44 | #include <stdlib.h>
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| 45 | #include <string.h>
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| 46 | #include <malloc.h>
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| 47 |
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| 48 | typedef struct _track_rec {
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| 49 | char *name;
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| 50 | HMODULE handle;
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| 51 | void *id;
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| 52 | struct _track_rec *next;
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| 53 | } tDLLchain, *DLLchain;
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| 54 |
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| 55 | static DLLchain dlload = NULL; /* A simple chained list of DLL names */
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| 56 | static char dlerr [256]; /* last error text string */
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| 57 | static void *last_id;
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| 58 |
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| 59 | static DLLchain find_id(void *id)
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| 60 | {
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| 61 | DLLchain tmp;
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| 62 |
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| 63 | for (tmp = dlload; tmp; tmp = tmp->next)
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| 64 | if (id == tmp->id)
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| 65 | return tmp;
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| 66 |
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| 67 | return NULL;
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| 68 | }
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| 69 |
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| 70 | /* load a dynamic-link library and return handle */
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| 71 | void *dlopen(char *filename, int flags)
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| 72 | {
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| 73 | HMODULE hm;
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| 74 | DLLchain tmp;
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| 75 | char err[256];
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| 76 | char *errtxt;
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| 77 | int rc = 0, set_chain = 0;
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| 78 |
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| 79 | for (tmp = dlload; tmp; tmp = tmp->next)
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| 80 | if (strnicmp(tmp->name, filename, 999) == 0)
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| 81 | break;
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| 82 |
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| 83 | if (!tmp)
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| 84 | {
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| 85 | tmp = (DLLchain) malloc(sizeof(tDLLchain));
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| 86 | if (!tmp)
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| 87 | goto nomem;
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| 88 | tmp->name = strdup(filename);
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| 89 | tmp->next = dlload;
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| 90 | set_chain = 1;
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| 91 | }
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| 92 |
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| 93 | switch (rc = DosLoadModule((PSZ)&err, sizeof(err), filename, &hm))
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| 94 | {
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| 95 | case NO_ERROR:
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| 96 | tmp->handle = hm;
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| 97 | if (set_chain)
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| 98 | {
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| 99 | do
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| 100 | last_id++;
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| 101 | while ((last_id == 0) || (find_id(last_id)));
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| 102 | tmp->id = last_id;
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| 103 | dlload = tmp;
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| 104 | }
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| 105 | return tmp->id;
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| 106 | case ERROR_FILE_NOT_FOUND:
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| 107 | case ERROR_PATH_NOT_FOUND:
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| 108 | errtxt = "module `%s' not found";
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| 109 | break;
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| 110 | case ERROR_TOO_MANY_OPEN_FILES:
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| 111 | case ERROR_NOT_ENOUGH_MEMORY:
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| 112 | case ERROR_SHARING_BUFFER_EXCEEDED:
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| 113 | nomem:
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| 114 | errtxt = "out of system resources";
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| 115 | break;
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| 116 | case ERROR_ACCESS_DENIED:
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| 117 | errtxt = "access denied";
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| 118 | break;
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| 119 | case ERROR_BAD_FORMAT:
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| 120 | case ERROR_INVALID_SEGMENT_NUMBER:
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| 121 | case ERROR_INVALID_ORDINAL:
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| 122 | case ERROR_INVALID_MODULETYPE:
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| 123 | case ERROR_INVALID_EXE_SIGNATURE:
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| 124 | case ERROR_EXE_MARKED_INVALID:
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| 125 | case ERROR_ITERATED_DATA_EXCEEDS_64K:
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| 126 | case ERROR_INVALID_MINALLOCSIZE:
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| 127 | case ERROR_INVALID_SEGDPL:
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| 128 | case ERROR_AUTODATASEG_EXCEEDS_64K:
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| 129 | case ERROR_RELOCSRC_CHAIN_EXCEEDS_SEGLIMIT:
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| 130 | errtxt = "invalid module format";
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| 131 | break;
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| 132 | case ERROR_INVALID_NAME:
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| 133 | errtxt = "filename doesn't match module name";
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| 134 | break;
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| 135 | case ERROR_SHARING_VIOLATION:
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| 136 | case ERROR_LOCK_VIOLATION:
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| 137 | errtxt = "sharing violation";
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| 138 | break;
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| 139 | case ERROR_INIT_ROUTINE_FAILED:
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| 140 | errtxt = "module initialization failed";
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| 141 | break;
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| 142 | default:
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| 143 | errtxt = "cause `%s', error code = %d";
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| 144 | break;
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| 145 | }
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| 146 | snprintf(dlerr, sizeof(dlerr), errtxt, &err, rc);
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| 147 | if (tmp)
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| 148 | {
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