6 * Copyright 1987 by the Student Information Processing Board
7 * of the Massachusetts Institute of Technology
9 * Permission to use, copy, modify, and distribute this software and
10 * its documentation for any purpose is hereby granted, provided that
11 * the names of M.I.T. and the M.I.T. S.I.P.B. not be used in
12 * advertising or publicity pertaining to distribution of the software
13 * without specific, written prior permission. M.I.T. and the
14 * M.I.T. S.I.P.B. make no representations about the suitability of
15 * this software for any purpose. It is provided "as is" without
16 * express or implied warranty.
24 #ifdef HAVE_SYS_PRCTL_H
25 #include <sys/prctl.h>
27 #define PR_GET_DUMPABLE 3
29 #if (!defined(HAVE_PRCTL) && defined(linux))
30 #include <sys/syscall.h>
32 #ifdef HAVE_SEMAPHORE_H
33 #include <semaphore.h>
42 #include <sys/types.h>
45 #include "error_table.h"
49 #define THREAD_LOCAL static TLS
51 #define THREAD_LOCAL static
54 THREAD_LOCAL char buffer[25];
56 struct et_list * _et_list = (struct et_list *) NULL;
57 struct et_list * _et_dynamic_list = (struct et_list *) NULL;
60 #define COMERR_ATTR(x) __attribute__(x)
62 #define COMERR_ATTR(x)
66 static sem_t _et_lock;
67 static int _et_lock_initialized;
69 static void COMERR_ATTR((constructor)) setup_et_lock(void)
71 sem_init(&_et_lock, 0, 1);
72 _et_lock_initialized = 1;
75 static void COMERR_ATTR((destructor)) fini_et_lock(void)
77 sem_destroy(&_et_lock);
78 _et_lock_initialized = 0;
83 int et_list_lock(void)
86 if (!_et_lock_initialized)
88 return sem_wait(&_et_lock);
94 int et_list_unlock(void)
97 if (_et_lock_initialized)
98 return sem_post(&_et_lock);
103 typedef char *(*gettextf) (const char *);
105 static gettextf com_err_gettext = NULL;
107 gettextf set_com_err_gettext(gettextf new_proc)
109 gettextf x = com_err_gettext;
111 com_err_gettext = new_proc;
117 const char * error_message (errcode_t code)
125 offset = (int) (code & ((1<<ERRCODE_RANGE)-1));
126 table_num = code - offset;
128 #ifdef HAS_SYS_ERRLIST
129 if (offset < sys_nerr)
130 return(sys_errlist[offset]);
134 cp = strerror(offset);
142 for (et = _et_list; et; et = et->next) {
143 if ((et->table->base & 0xffffffL) == (table_num & 0xffffffL)) {
144 /* This is the right table */
145 if (et->table->n_msgs <= offset) {
148 const char *msg = et->table->msgs[offset];
151 return (*com_err_gettext)(msg);
157 for (et = _et_dynamic_list; et; et = et->next) {
158 if ((et->table->base & 0xffffffL) == (table_num & 0xffffffL)) {
159 /* This is the right table */
160 if (et->table->n_msgs <= offset) {
163 const char *msg = et->table->msgs[offset];
166 return (*com_err_gettext)(msg);
174 strcpy (buffer, "Unknown code ");
176 strcat (buffer, error_table_name (table_num));
177 strcat (buffer, " ");
179 for (cp = buffer; *cp; cp++)
182 *cp++ = '0' + offset / 100;
186 if (started || offset >= 10) {
187 *cp++ = '0' + offset / 10;
190 *cp++ = '0' + offset;
196 * This routine will only return a value if the we are not running as
197 * a privileged process.
199 static char *safe_getenv(const char *arg)
202 if ((getuid() != geteuid()) || (getgid() != getegid()))
206 if (prctl(PR_GET_DUMPABLE, 0, 0, 0, 0) == 0)
209 #if (defined(linux) && defined(SYS_prctl))
210 if (syscall(SYS_prctl, PR_GET_DUMPABLE, 0, 0, 0, 0) == 0)
215 #if defined(HAVE_SECURE_GETENV)
216 return secure_getenv(arg);
217 #elif defined(HAVE___SECURE_GETENV)
218 return __secure_getenv(arg);
224 #define DEBUG_INIT 0x8000
225 #define DEBUG_ADDREMOVE 0x0001
227 static int debug_mask = 0;
228 static FILE *debug_f = 0;
230 static void init_debug(void)
232 char *dstr, *fn, *tmp;
235 if (debug_mask & DEBUG_INIT)
238 dstr = getenv("COMERR_DEBUG");
240 debug_mask = strtoul(dstr, &tmp, 0);
245 debug_mask |= DEBUG_INIT;
246 if (debug_mask == DEBUG_INIT)
249 fn = safe_getenv("COMERR_DEBUG_FILE");
251 debug_f = fopen(fn, "a");
253 debug_f = fopen("/dev/tty", "a");
255 fd = fileno(debug_f);
256 #if defined(HAVE_FCNTL)
258 flags = fcntl(fd, F_GETFD);
260 fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
264 debug_mask = DEBUG_INIT;
269 * New interface provided by krb5's com_err library
271 errcode_t add_error_table(const struct error_table * et)
275 if (!(el = (struct et_list *) malloc(sizeof(struct et_list))))
278 if (et_list_lock() != 0) {
284 el->next = _et_dynamic_list;
285 _et_dynamic_list = el;
288 if (debug_mask & DEBUG_ADDREMOVE)
289 fprintf(debug_f, "add_error_table: %s (0x%p)\n",
290 error_table_name(et->base),
298 * New interface provided by krb5's com_err library
300 errcode_t remove_error_table(const struct error_table * et)
303 struct et_list *el2 = 0;
305 if (et_list_lock() != 0)
308 el = _et_dynamic_list;
311 if (el->table->base == et->base) {
312 if (el2) /* Not the beginning of the list */
313 el2->next = el->next;
315 _et_dynamic_list = el->next;
317 if (debug_mask & DEBUG_ADDREMOVE)
319 "remove_error_table: %s (0x%p)\n",
320 error_table_name(et->base),
328 if (debug_mask & DEBUG_ADDREMOVE)
329 fprintf(debug_f, "remove_error_table FAILED: %s (0x%p)\n",
330 error_table_name(et->base),
337 * Variant of the interface provided by Heimdal's com_err library
340 add_to_error_table(struct et_list *new_table)
342 add_error_table(new_table->table);