/[LeafOK_CVS]/lbbs/src/file_loader.c
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Revision 1.5 by sysadm, Sat May 17 15:39:51 2025 UTC Revision 1.19 by sysadm, Tue Nov 4 14:30:44 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 by Leaflet <leaflet@leafok.com>
7     */
 /***************************************************************************  
  *                                                                         *  
  *   This program is free software; you can redistribute it and/or modify  *  
  *   it under the terms of the GNU General Public License as published by  *  
  *   the Free Software Foundation; either version 3 of the License, or     *  
  *   (at your option) any later version.                                   *  
  *                                                                         *  
  ***************************************************************************/  
8    
9  #include "file_loader.h"  #include "file_loader.h"
 #include "trie_dict.h"  
 #include "str_process.h"  
10  #include "log.h"  #include "log.h"
11  #include <fcntl.h>  #include "str_process.h"
12    #include "trie_dict.h"
13  #include <errno.h>  #include <errno.h>
14  #include <unistd.h>  #include <fcntl.h>
15  #include <stdlib.h>  #include <stdlib.h>
16  #include <string.h>  #include <string.h>
17  #include <time.h>  #include <time.h>
18    #include <unistd.h>
19    #include <sys/ipc.h>
20  #include <sys/mman.h>  #include <sys/mman.h>
 #include <sys/stat.h>  
21  #include <sys/shm.h>  #include <sys/shm.h>
22  #include <sys/ipc.h>  #include <sys/stat.h>
23    
24  #define MAX_SPLIT_FILE_LINES 65536  struct shm_header_t
25    {
26            int shmid;
27            size_t data_len;
28            long line_total;
29    };
30    
31  static TRIE_NODE *p_trie_file_dict = NULL;  static TRIE_NODE *p_trie_file_dict = NULL;
32    
# Line 51  int file_loader_init() Line 48  int file_loader_init()
48          return 0;          return 0;
49  }  }
50    
51  static void trie_file_dict_cleanup_cb(const char *filename, int64_t shmid)  static void trie_file_dict_cleanup_cb(const char *filename, int64_t value)
52  {  {
53          if (shmctl((int)shmid, IPC_RMID, NULL) == -1)          int shmid = (int)value;
54    
55            if (shmid != 0 && shmctl(shmid, IPC_RMID, NULL) == -1)
56          {          {
57                  log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", (int)shmid, errno);                  log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", shmid, errno);
58          }          }
59  }  }
60    
# Line 68  void file_loader_cleanup(void) Line 67  void file_loader_cleanup(void)
67    
68          trie_dict_traverse(p_trie_file_dict, trie_file_dict_cleanup_cb);          trie_dict_traverse(p_trie_file_dict, trie_file_dict_cleanup_cb);
69          trie_dict_destroy(p_trie_file_dict);          trie_dict_destroy(p_trie_file_dict);
70    
71            p_trie_file_dict = NULL;
72  }  }
73    
74  int load_file_shm(const char *filename)  int load_file(const char *filename)
75  {  {
76          int fd;          int fd;
77          struct stat sb;          struct stat sb;
# Line 80  int load_file_shm(const char *filename) Line 81  int load_file_shm(const char *filename)
81          key_t key;          key_t key;
82          size_t size;          size_t size;
83          int shmid;          int shmid;
         int64_t shmid_old;  
84          void *p_shm;          void *p_shm;
85          long line_total;          long line_total;
86          long line_offsets[MAX_SPLIT_FILE_LINES];          long line_offsets[MAX_SPLIT_FILE_LINES];
87          long *p_line_offsets;          long *p_line_offsets;
88            int64_t shmid_old;
89    
90          if ((fd = open(filename, O_RDONLY)) < 0)          if ((fd = open(filename, O_RDONLY)) < 0)
91          {          {
# Line 112  int load_file_shm(const char *filename) Line 113  int load_file_shm(const char *filename)
113                  return -1;                  return -1;
114          }          }
115    
116          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");  
         }  
117    
118          // Allocate shared memory          // Allocate shared memory
119          proj_id = (int)(time(NULL) % getpid());          proj_id = (int)(time(NULL) % getpid());
# Line 127  int load_file_shm(const char *filename) Line 124  int load_file_shm(const char *filename)
124                  return -2;                  return -2;
125          }          }
126    
127          size = sizeof(data_len) + sizeof(line_total) + data_len + 1 + sizeof(long) * (size_t)(line_total + 1);          size = sizeof(struct shm_header_t) + data_len + 1 + sizeof(long) * (size_t)(line_total + 1);
128          shmid = shmget(key, size, IPC_CREAT | IPC_EXCL | 0600);          shmid = shmget(key, size, IPC_CREAT | IPC_EXCL | 0600);
129          if (shmid == -1)          if (shmid == -1)
130          {          {
# Line 137  int load_file_shm(const char *filename) Line 134  int load_file_shm(const char *filename)
134          p_shm = shmat(shmid, NULL, 0);          p_shm = shmat(shmid, NULL, 0);
135          if (p_shm == (void *)-1)          if (p_shm == (void *)-1)
136          {          {
137                  log_error("shmat() error (%d)\n", errno);                  log_error("shmat(shmid=%d) error (%d)\n", shmid, errno);
138                  return -3;                  return -3;
139          }          }
140    
141          *((size_t *)p_shm) = data_len;          ((struct shm_header_t *)p_shm)->shmid = shmid;
142          *((long *)(p_shm + sizeof(data_len))) = line_total;          ((struct shm_header_t *)p_shm)->data_len = data_len;
143          memcpy(p_shm + sizeof(data_len) + sizeof(line_total), p_data, data_len);          ((struct shm_header_t *)p_shm)->line_total = line_total;
144            memcpy((char *)p_shm + sizeof(struct shm_header_t), p_data, data_len);
145    
146          if (munmap(p_data, data_len) < 0)          if (munmap(p_data, data_len) < 0)
147          {          {
# Line 151  int load_file_shm(const char *filename) Line 149  int load_file_shm(const char *filename)
149                  return -2;                  return -2;
150          }          }
151    
152          p_data = p_shm + sizeof(data_len) + sizeof(line_total);          p_data = (char *)p_shm + sizeof(struct shm_header_t);
153          p_line_offsets = p_data + data_len + 1;          p_line_offsets = (long *)((char *)p_data + data_len + 1);
154          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));
155    
156          if (shmdt(p_shm) == -1)          if (shmdt(p_shm) == -1)
157          {          {
158                  log_error("shmdt() error (%d)\n", errno);                  log_error("shmdt(shmid=%d) error (%d)\n", shmid, errno);
159                  return -3;                  return -3;
160          }          }
161    
# Line 174  int load_file_shm(const char *filename) Line 172  int load_file_shm(const char *filename)
172          {          {
173                  log_error("trie_dict_set(%s) error\n", filename);                  log_error("trie_dict_set(%s) error\n", filename);
174    
175                  if (shmctl(shmid, IPC_RMID, NULL) == -1)                  if (shmid != 0 && shmctl(shmid, IPC_RMID, NULL) == -1)
176                  {                  {
177                          log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", shmid, errno);                          log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", shmid, errno);
178                  }                  }
# Line 185  int load_file_shm(const char *filename) Line 183  int load_file_shm(const char *filename)
183          return 0;          return 0;
184  }  }
185    
186  int unload_file_shm(const char *filename)  int unload_file(const char *filename)
187  {  {
188          int64_t shmid = 0;          int64_t shmid;
189    
190          if (trie_dict_get(p_trie_file_dict, filename, (int64_t *)&shmid) != 1)          if (trie_dict_get(p_trie_file_dict, filename, &shmid) != 1)
191          {          {
192                  log_error("trie_dict_get(%s) not found\n", filename);                  log_error("trie_dict_get(%s) not found\n", filename);
193                  return -1;                  return -1;
# Line 209  int unload_file_shm(const char *filename Line 207  int unload_file_shm(const char *filename
207          return 0;          return 0;
208  }  }
209    
210  const void *get_file_shm(const char *filename)  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)
211  {  {
212          int64_t shmid;          int64_t shmid;
213          const void *p_shm;          const void *p_shm;
# Line 229  const void *get_file_shm(const char *fil Line 227  const void *get_file_shm(const char *fil
227          p_shm = shmat((int)shmid, NULL, SHM_RDONLY);          p_shm = shmat((int)shmid, NULL, SHM_RDONLY);
228          if (p_shm == (void *)-1)          if (p_shm == (void *)-1)
229          {          {
230                  log_error("shmat() error (%d)\n", errno);                  log_error("shmat(shmid=%d) error (%d)\n", (int)shmid, errno);
231                  return NULL;                  return NULL;
232          }          }
233    
234            *p_data_len = ((struct shm_header_t *)p_shm)->data_len;
235            *p_line_total = ((struct shm_header_t *)p_shm)->line_total;
236            *pp_data = (char *)p_shm + sizeof(struct shm_header_t);
237            *pp_line_offsets = (const long *)((const char *)(*pp_data) + *p_data_len + 1);
238    
239          return p_shm;          return p_shm;
240  }  }
241    
242    int detach_file_shm(const void *p_shm)
243    {
244            if (p_shm == NULL)
245            {
246                    return -2;
247            }
248    
249            if (shmdt(p_shm) == -1)
250            {
251                    log_error("shmdt() error (%d)\n", errno);
252                    return -1;
253            }
254    
255            return 0;
256    }

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