| 1 | /* -*- C -*- ***********************************************
|
|---|
| 2 | Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
|
|---|
| 3 | The Netherlands.
|
|---|
| 4 |
|
|---|
| 5 | All Rights Reserved
|
|---|
| 6 |
|
|---|
| 7 | Permission to use, copy, modify, and distribute this software and its
|
|---|
| 8 | documentation for any purpose and without fee is hereby granted,
|
|---|
| 9 | provided that the above copyright notice appear in all copies and that
|
|---|
| 10 | both that copyright notice and this permission notice appear in
|
|---|
| 11 | supporting documentation, and that the names of Stichting Mathematisch
|
|---|
| 12 | Centrum or CWI or Corporation for National Research Initiatives or
|
|---|
| 13 | CNRI not be used in advertising or publicity pertaining to
|
|---|
| 14 | distribution of the software without specific, written prior
|
|---|
| 15 | permission.
|
|---|
| 16 |
|
|---|
| 17 | While CWI is the initial source for this software, a modified version
|
|---|
| 18 | is made available by the Corporation for National Research Initiatives
|
|---|
| 19 | (CNRI) at the Internet address ftp://ftp.python.org.
|
|---|
| 20 |
|
|---|
| 21 | STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
|
|---|
| 22 | REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
|
|---|
| 23 | MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
|
|---|
| 24 | CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
|
|---|
| 25 | DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
|
|---|
| 26 | PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
|
|---|
| 27 | TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
|
|---|
| 28 | PERFORMANCE OF THIS SOFTWARE.
|
|---|
| 29 |
|
|---|
| 30 | ******************************************************************/
|
|---|
| 31 |
|
|---|
| 32 | /* This library implements dlopen() - Unix-like dynamic linking
|
|---|
| 33 | * emulation functions for OS/2 using DosLoadModule() and company.
|
|---|
| 34 | */
|
|---|
| 35 |
|
|---|
| 36 | #define INCL_DOS
|
|---|
| 37 | #define INCL_DOSERRORS
|
|---|
| 38 | #define INCL_DOSSESMGR
|
|---|
| 39 | #define INCL_WINPROGRAMLIST
|
|---|
| 40 | #define INCL_WINFRAMEMGR
|
|---|
| 41 | #include <os2.h>
|
|---|
| 42 |
|
|---|
| 43 | #include <stdio.h>
|
|---|
| 44 | #include <stdlib.h>
|
|---|
| 45 | #include <string.h>
|
|---|
| 46 | #include <malloc.h>
|
|---|
| 47 |
|
|---|
| 48 | typedef struct _track_rec {
|
|---|
| 49 | char *name;
|
|---|
| 50 | HMODULE handle;
|
|---|
| 51 | void *id;
|
|---|
| 52 | struct _track_rec *next;
|
|---|
| 53 | } tDLLchain, *DLLchain;
|
|---|
| 54 |
|
|---|
| 55 | static DLLchain dlload = NULL; /* A simple chained list of DLL names */
|
|---|
| 56 | static char dlerr [256]; /* last error text string */
|
|---|
| 57 | static void *last_id;
|
|---|
| 58 |
|
|---|
| 59 | static DLLchain find_id(void *id)
|
|---|
| 60 | {
|
|---|
| 61 | DLLchain tmp;
|
|---|
| 62 |
|
|---|
| 63 | for (tmp = dlload; tmp; tmp = tmp->next)
|
|---|
| 64 | if (id == tmp->id)
|
|---|
| 65 | return tmp;
|
|---|
| 66 |
|
|---|
| 67 | return NULL;
|
|---|
| 68 | }
|
|---|
| 69 |
|
|---|
| 70 | /* load a dynamic-link library and return handle */
|
|---|
| 71 | void *dlopen(char *filename, int flags)
|
|---|
| 72 | {
|
|---|
| 73 | HMODULE hm;
|
|---|
| 74 | DLLchain tmp;
|
|---|
| 75 | char err[256];
|
|---|
| 76 | char *errtxt;
|
|---|
| 77 | int rc = 0, set_chain = 0;
|
|---|
| 78 |
|
|---|
| 79 | for (tmp = dlload; tmp; tmp = tmp->next)
|
|---|
| 80 | if (strnicmp(tmp->name, filename, 999) == 0)
|
|---|
| 81 | break;
|
|---|
| 82 |
|
|---|
| 83 | if (!tmp)
|
|---|
| 84 | {
|
|---|
| 85 | tmp = (DLLchain) malloc(sizeof(tDLLchain));
|
|---|
| 86 | if (!tmp)
|
|---|
| 87 | goto nomem;
|
|---|
| 88 | tmp->name = strdup(filename);
|
|---|
| 89 | tmp->next = dlload;
|
|---|
| 90 | set_chain = 1;
|
|---|
| 91 | }
|
|---|
| 92 |
|
|---|
| 93 | switch (rc = DosLoadModule((PSZ)&err, sizeof(err), filename, &hm))
|
|---|
| 94 | {
|
|---|
| 95 | case NO_ERROR:
|
|---|
| 96 | tmp->handle = hm;
|
|---|
| 97 | if (set_chain)
|
|---|
| 98 | {
|
|---|
| 99 | do
|
|---|
| 100 | last_id++;
|
|---|
| 101 | while ((last_id == 0) || (find_id(last_id)));
|
|---|
| 102 | tmp->id = last_id;
|
|---|
| 103 | dlload = tmp;
|
|---|
| 104 | }
|
|---|
| 105 | return tmp->id;
|
|---|
| 106 | case ERROR_FILE_NOT_FOUND:
|
|---|
| 107 | case ERROR_PATH_NOT_FOUND:
|
|---|
| 108 | errtxt = "module `%s' not found";
|
|---|
| 109 | break;
|
|---|
| 110 | case ERROR_TOO_MANY_OPEN_FILES:
|
|---|
| 111 | case ERROR_NOT_ENOUGH_MEMORY:
|
|---|
| 112 | case ERROR_SHARING_BUFFER_EXCEEDED:
|
|---|
| 113 | nomem:
|
|---|
| 114 | errtxt = "out of system resources";
|
|---|
| 115 | break;
|
|---|
| 116 | case ERROR_ACCESS_DENIED:
|
|---|
| 117 | errtxt = "access denied";
|
|---|
| 118 | break;
|
|---|
| 119 | case ERROR_BAD_FORMAT:
|
|---|
| 120 | case ERROR_INVALID_SEGMENT_NUMBER:
|
|---|
| 121 | case ERROR_INVALID_ORDINAL:
|
|---|
| 122 | case ERROR_INVALID_MODULETYPE:
|
|---|
| 123 | case ERROR_INVALID_EXE_SIGNATURE:
|
|---|
| 124 | case ERROR_EXE_MARKED_INVALID:
|
|---|
| 125 | case ERROR_ITERATED_DATA_EXCEEDS_64K:
|
|---|
| 126 | case ERROR_INVALID_MINALLOCSIZE:
|
|---|
| 127 | case ERROR_INVALID_SEGDPL:
|
|---|
| 128 | case ERROR_AUTODATASEG_EXCEEDS_64K:
|
|---|
| 129 | case ERROR_RELOCSRC_CHAIN_EXCEEDS_SEGLIMIT:
|
|---|
| 130 | errtxt = "invalid module format";
|
|---|
| 131 | break;
|
|---|
| 132 | case ERROR_INVALID_NAME:
|
|---|
| 133 | errtxt = "filename doesn't match module name";
|
|---|
| 134 | break;
|
|---|
| 135 | case ERROR_SHARING_VIOLATION:
|
|---|
| 136 | case ERROR_LOCK_VIOLATION:
|
|---|
| 137 | errtxt = "sharing violation";
|
|---|
| 138 | break;
|
|---|
| 139 | case ERROR_INIT_ROUTINE_FAILED:
|
|---|
| 140 | errtxt = "module initialization failed";
|
|---|
| 141 | break;
|
|---|
| 142 | default:
|
|---|
| 143 | errtxt = "cause `%s', error code = %d";
|
|---|
| 144 | break;
|
|---|
| 145 | }
|
|---|
| 146 | snprintf(dlerr, sizeof(dlerr), errtxt, &err, rc);
|
|---|
| 147 | if (tmp)
|
|---|
| 148 | {
|
|---|
| 149 | if (tmp->name)
|
|---|
| 150 | free(tmp->name);
|
|---|
| 151 | free(tmp);
|
|---|
| 152 | }
|
|---|
| 153 | return 0;
|
|---|
| 154 | }
|
|---|
| 155 |
|
|---|
| 156 | /* return a pointer to the `symbol' in DLL */
|
|---|
| 157 | void *dlsym(void *handle, char *symbol)
|
|---|
| 158 | {
|
|---|
| 159 | int rc = 0;
|
|---|
| 160 | PFN addr;
|
|---|
| 161 | char *errtxt;
|
|---|
| 162 | int symord = 0;
|
|---|
| 163 | DLLchain tmp = find_id(handle);
|
|---|
| 164 |
|
|---|
| 165 | if (!tmp)
|
|---|
| 166 | goto inv_handle;
|
|---|
| 167 |
|
|---|
| 168 | if (*symbol == '#')
|
|---|
| 169 | symord = atoi(symbol + 1);
|
|---|
| 170 |
|
|---|
| 171 | switch (rc = DosQueryProcAddr(tmp->handle, symord, symbol, &addr))
|
|---|
| 172 | {
|
|---|
| 173 | case NO_ERROR:
|
|---|
| 174 | return (void *)addr;
|
|---|
| 175 | case ERROR_INVALID_HANDLE:
|
|---|
| 176 | inv_handle:
|
|---|
| 177 | errtxt = "invalid module handle";
|
|---|
| 178 | break;
|
|---|
| 179 | case ERROR_PROC_NOT_FOUND:
|
|---|
| 180 | case ERROR_INVALID_NAME:
|
|---|
| 181 | errtxt = "no symbol `%s' in module";
|
|---|
| 182 | break;
|
|---|
| 183 | default:
|
|---|
| 184 | errtxt = "symbol `%s', error code = %d";
|
|---|
| 185 | break;
|
|---|
| 186 | }
|
|---|
| 187 | snprintf(dlerr, sizeof(dlerr), errtxt, symbol, rc);
|
|---|
| 188 | return NULL;
|
|---|
| 189 | }
|
|---|
| 190 |
|
|---|
| 191 | /* free dynamically-linked library */
|
|---|
| 192 | int dlclose(void *handle)
|
|---|
| 193 | {
|
|---|
| 194 | int rc;
|
|---|
| 195 | DLLchain tmp = find_id(handle);
|
|---|
| 196 |
|
|---|
| 197 | if (!tmp)
|
|---|
| 198 | goto inv_handle;
|
|---|
| 199 |
|
|---|
| 200 | switch (rc = DosFreeModule(tmp->handle))
|
|---|
| 201 | {
|
|---|
| 202 | case NO_ERROR:
|
|---|
| 203 | free(tmp->name);
|
|---|
| 204 | dlload = tmp->next;
|
|---|
| 205 | free(tmp);
|
|---|
| 206 | return 0;
|
|---|
| 207 | case ERROR_INVALID_HANDLE:
|
|---|
| 208 | inv_handle:
|
|---|
| 209 | strcpy(dlerr, "invalid module handle");
|
|---|
| 210 | return -1;
|
|---|
| 211 | case ERROR_INVALID_ACCESS:
|
|---|
| 212 | strcpy(dlerr, "access denied");
|
|---|
| 213 | return -1;
|
|---|
| 214 | default:
|
|---|
| 215 | return -1;
|
|---|
| 216 | }
|
|---|
| 217 | }
|
|---|
| 218 |
|
|---|
| 219 | /* return a string describing last occurred dl error */
|
|---|
| 220 | char *dlerror()
|
|---|
| 221 | {
|
|---|
| 222 | return dlerr;
|
|---|
| 223 | }
|
|---|
