/[LeafOK_CVS]/lbbs/src/file_loader.c
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Revision 1.10 by sysadm, Fri May 23 14:11:38 2025 UTC Revision 1.21 by sysadm, Tue Nov 11 00:28:05 2025 UTC
# Line 1  Line 1 
1  /***************************************************************************  /* SPDX-License-Identifier: GPL-3.0-or-later */
2                                                  file_loader.c  -  description  /*
3                                                           -------------------   * file_loader
4          Copyright            : (C) 2004-2025 by Leaflet   *   - shared memory based file loader
5          Email                : leaflet@leafok.com   *
6   ***************************************************************************/   * Copyright (C) 2004-2025  Leaflet <leaflet@leafok.com>
7     */
8  /***************************************************************************  
9   *                                                                         *  #ifdef HAVE_CONFIG_H
10   *   This program is free software; you can redistribute it and/or modify  *  #include "config.h"
11   *   it under the terms of the GNU General Public License as published by  *  #endif
  *   the Free Software Foundation; either version 3 of the License, or     *  
  *   (at your option) any later version.                                   *  
  *                                                                         *  
  ***************************************************************************/  
12    
13  #include "file_loader.h"  #include "file_loader.h"
 #include "trie_dict.h"  
 #include "str_process.h"  
14  #include "log.h"  #include "log.h"
15  #include <fcntl.h>  #include "str_process.h"
16    #include "trie_dict.h"
17  #include <errno.h>  #include <errno.h>
18  #include <unistd.h>  #include <fcntl.h>
19  #include <stdlib.h>  #include <stdlib.h>
20  #include <string.h>  #include <string.h>
21  #include <time.h>  #include <time.h>
22    #include <unistd.h>
23    #include <sys/ipc.h>
24  #include <sys/mman.h>  #include <sys/mman.h>
 #include <sys/stat.h>  
25  #include <sys/shm.h>  #include <sys/shm.h>
26  #include <sys/ipc.h>  #include <sys/stat.h>
   
 #define MAX_SPLIT_FILE_LINES 65536  
27    
28  struct shm_header_t  struct shm_header_t
29  {  {
# Line 60  int file_loader_init() Line 54  int file_loader_init()
54    
55  static void trie_file_dict_cleanup_cb(const char *filename, int64_t value)  static void trie_file_dict_cleanup_cb(const char *filename, int64_t value)
56  {  {
57          const void *p_shm = (const void *)value;          int shmid = (int)value;
         int shmid = *((int *)p_shm);  
   
         if (shmdt(p_shm) == -1)  
         {  
                 log_error("shmdt(shmid=%d) error (%d)\n", shmid, errno);  
         }  
58    
59          if (shmctl(shmid, IPC_RMID, NULL) == -1)          if (shmid != 0 && shmctl(shmid, IPC_RMID, NULL) == -1)
60          {          {
61                  log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", shmid, errno);                  log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", shmid, errno);
62          }          }
# Line 82  void file_loader_cleanup(void) Line 70  void file_loader_cleanup(void)
70          }          }
71    
72          trie_dict_traverse(p_trie_file_dict, trie_file_dict_cleanup_cb);          trie_dict_traverse(p_trie_file_dict, trie_file_dict_cleanup_cb);
   
73          trie_dict_destroy(p_trie_file_dict);          trie_dict_destroy(p_trie_file_dict);
74    
75          p_trie_file_dict = NULL;          p_trie_file_dict = NULL;
76  }  }
77    
78  int load_file_shm(const char *filename)  int load_file(const char *filename)
79  {  {
80          int fd;          int fd;
81          struct stat sb;          struct stat sb;
# Line 102  int load_file_shm(const char *filename) Line 90  int load_file_shm(const char *filename)
90          long line_offsets[MAX_SPLIT_FILE_LINES];          long line_offsets[MAX_SPLIT_FILE_LINES];
91          long *p_line_offsets;          long *p_line_offsets;
92          int64_t shmid_old;          int64_t shmid_old;
         void *p_shm_old;  
93    
94          if ((fd = open(filename, O_RDONLY)) < 0)          if ((fd = open(filename, O_RDONLY)) < 0)
95          {          {
# Line 130  int load_file_shm(const char *filename) Line 117  int load_file_shm(const char *filename)
117                  return -1;                  return -1;
118          }          }
119    
120          line_total = split_data_lines(p_data, SCREEN_COLS, line_offsets, MAX_SPLIT_FILE_LINES);          line_total = split_data_lines(p_data, SCREEN_COLS, line_offsets, MAX_SPLIT_FILE_LINES, 1, NULL);
         if (line_total >= MAX_SPLIT_FILE_LINES)  
         {  
                 log_error("split_data_lines() truncated over limit lines\n");  
         }  
121    
122          // Allocate shared memory          // Allocate shared memory
123          proj_id = (int)(time(NULL) % getpid());          proj_id = (int)(time(NULL) % getpid());
# Line 162  int load_file_shm(const char *filename) Line 145  int load_file_shm(const char *filename)
145          ((struct shm_header_t *)p_shm)->shmid = shmid;          ((struct shm_header_t *)p_shm)->shmid = shmid;
146          ((struct shm_header_t *)p_shm)->data_len = data_len;          ((struct shm_header_t *)p_shm)->data_len = data_len;
147          ((struct shm_header_t *)p_shm)->line_total = line_total;          ((struct shm_header_t *)p_shm)->line_total = line_total;
148          memcpy(p_shm + sizeof(struct shm_header_t), p_data, data_len);          memcpy((char *)p_shm + sizeof(struct shm_header_t), p_data, data_len);
149    
150          if (munmap(p_data, data_len) < 0)          if (munmap(p_data, data_len) < 0)
151          {          {
# Line 170  int load_file_shm(const char *filename) Line 153  int load_file_shm(const char *filename)
153                  return -2;                  return -2;
154          }          }
155    
156          p_data = p_shm + sizeof(struct shm_header_t);          p_data = (char *)p_shm + sizeof(struct shm_header_t);
157          p_line_offsets = p_data + data_len + 1;          p_line_offsets = (long *)((char *)p_data + data_len + 1);
158          memcpy(p_line_offsets, line_offsets, sizeof(long) * (size_t)(line_total + 1));          memcpy(p_line_offsets, line_offsets, sizeof(long) * (size_t)(line_total + 1));
159    
160          // Remap shared memory in read-only mode          if (shmdt(p_shm) == -1)
         p_shm = shmat(shmid, p_shm, SHM_RDONLY | SHM_REMAP);  
         if (p_shm == (void *)-1)  
161          {          {
162                  log_error("shmat(shmid=%d) error (%d)\n", shmid, errno);                  log_error("shmdt(shmid=%d) error (%d)\n", shmid, errno);
163                  return -3;                  return -3;
164          }          }
165    
166          if (trie_dict_get(p_trie_file_dict, filename, (int64_t *)&p_shm_old) == 1)          if (trie_dict_get(p_trie_file_dict, filename, &shmid_old) == 1)
167          {          {
                 shmid_old = *((int *)p_shm_old);  
   
                 if (shmdt(p_shm_old) == -1)  
                 {  
                         log_error("shmdt(shmid=%d) error (%d)\n", shmid_old, errno);  
                         return -3;  
                 }  
   
168                  if (shmctl((int)shmid_old, IPC_RMID, NULL) == -1)                  if (shmctl((int)shmid_old, IPC_RMID, NULL) == -1)
169                  {                  {
170                          log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", (int)shmid_old, errno);                          log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", (int)shmid_old, errno);
# Line 199  int load_file_shm(const char *filename) Line 172  int load_file_shm(const char *filename)
172                  }                  }
173          }          }
174    
175          if (trie_dict_set(p_trie_file_dict, filename, (int64_t)p_shm) != 1)          if (trie_dict_set(p_trie_file_dict, filename, (int64_t)shmid) != 1)
176          {          {
177                  log_error("trie_dict_set(%s) error\n", filename);                  log_error("trie_dict_set(%s) error\n", filename);
178    
179                  if (shmctl(shmid, IPC_RMID, NULL) == -1)                  if (shmid != 0 && shmctl(shmid, IPC_RMID, NULL) == -1)
180                  {                  {
181                          log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", shmid, errno);                          log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", shmid, errno);
182                  }                  }
# Line 214  int load_file_shm(const char *filename) Line 187  int load_file_shm(const char *filename)
187          return 0;          return 0;
188  }  }
189    
190  int unload_file_shm(const char *filename)  int unload_file(const char *filename)
191  {  {
192          const void *p_shm;          int64_t shmid;
         int shmid;  
193    
194          if (trie_dict_get(p_trie_file_dict, filename, (int64_t *)&p_shm) != 1)          if (trie_dict_get(p_trie_file_dict, filename, &shmid) != 1)
195          {          {
196                  log_error("trie_dict_get(%s) not found\n", filename);                  log_error("trie_dict_get(%s) not found\n", filename);
197                  return -1;                  return -1;
198          }          }
199    
         shmid = *((int *)p_shm);  
   
         if (shmdt(p_shm) == -1)  
         {  
                 log_error("shmdt(shmid=%d) error (%d)\n", shmid, errno);  
         }  
   
200          if (shmctl((int)shmid, IPC_RMID, NULL) == -1)          if (shmctl((int)shmid, IPC_RMID, NULL) == -1)
201          {          {
202                  log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", (int)shmid, errno);                  log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", (int)shmid, errno);
# Line 246  int unload_file_shm(const char *filename Line 211  int unload_file_shm(const char *filename
211          return 0;          return 0;
212  }  }
213    
214  const void *get_file_shm(const char *filename, size_t *p_data_len, long *p_line_total, const void **pp_data, const long **pp_line_offsets)  const void *get_file_shm_readonly(const char *filename, size_t *p_data_len, long *p_line_total, const void **pp_data, const long **pp_line_offsets)
215  {  {
216            int64_t shmid;
217          const void *p_shm;          const void *p_shm;
218    
219          if (p_trie_file_dict == NULL)          if (p_trie_file_dict == NULL)
# Line 256  const void *get_file_shm(const char *fil Line 222  const void *get_file_shm(const char *fil
222                  return NULL;                  return NULL;
223          }          }
224    
225          if (trie_dict_get(p_trie_file_dict, filename, (int64_t *)&p_shm) != 1) // Not exist          if (trie_dict_get(p_trie_file_dict, filename, &shmid) != 1) // Not exist
226          {          {
227                  log_error("trie_dict_get(%s) not found\n", filename);                  log_error("trie_dict_get(%s) not found\n", filename);
228                  return NULL;                  return NULL;
229          }          }
230    
231            p_shm = shmat((int)shmid, NULL, SHM_RDONLY);
232            if (p_shm == (void *)-1)
233            {
234                    log_error("shmat(shmid=%d) error (%d)\n", (int)shmid, errno);
235                    return NULL;
236            }
237    
238          *p_data_len = ((struct shm_header_t *)p_shm)->data_len;          *p_data_len = ((struct shm_header_t *)p_shm)->data_len;
239          *p_line_total = ((struct shm_header_t *)p_shm)->line_total;          *p_line_total = ((struct shm_header_t *)p_shm)->line_total;
240          *pp_data = p_shm + sizeof(struct shm_header_t);          *pp_data = (char *)p_shm + sizeof(struct shm_header_t);
241          *pp_line_offsets = *pp_data + *p_data_len + 1;          *pp_line_offsets = (const long *)((const char *)(*pp_data) + *p_data_len + 1);
242    
243          return p_shm;          return p_shm;
244  }  }
245    
246    int detach_file_shm(const void *p_shm)
247    {
248            if (p_shm == NULL)
249            {
250                    return -2;
251            }
252    
253            if (shmdt(p_shm) == -1)
254            {
255                    log_error("shmdt() error (%d)\n", errno);
256                    return -1;
257            }
258    
259            return 0;
260    }

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