lbbs/src/file_loader.c

/***************************************************************************
                                                file_loader.c  -  description
                                                         -------------------
        Copyright            : (C) 2004-2025 by Leaflet
        Email                : leaflet@leafok.com
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/

#include "file_loader.h"
#include "trie_dict.h"
#include "str_process.h"
#include "log.h"
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/shm.h>
#include <sys/ipc.h>

#define MAX_SPLIT_FILE_LINES 65536

static TRIE_NODE *p_trie_file_dict = NULL;

int file_loader_init()
{
        if (p_trie_file_dict != NULL)
        {
                log_error("File loader already initialized\n");
                return -1;
        }

        p_trie_file_dict = trie_dict_create();
        if (p_trie_file_dict == NULL)
        {
                log_error("trie_dict_create() error\n");
                return -2;
        }

        return 0;
}

static void trie_file_dict_cleanup_cb(const char *filename, int64_t value)
{
        const void *p_shm = (const void *)value;
        int shmid = *((int *)p_shm);

        if (shmdt(p_shm) == -1)
        {
                log_error("shmdt(shmid=%d) error (%d)\n", shmid, errno);
        }

        if (shmctl(shmid, IPC_RMID, NULL) == -1)
        {
                log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", shmid, errno);
        }
}

void file_loader_cleanup(void)
{
        if (p_trie_file_dict == NULL)
        {
                return;
        }

        trie_dict_traverse(p_trie_file_dict, trie_file_dict_cleanup_cb);

        trie_dict_destroy(p_trie_file_dict);
        p_trie_file_dict = NULL;
}

int load_file_shm(const char *filename)
{
        int fd;
        struct stat sb;
        void *p_data;
        size_t data_len;
        int proj_id;
        key_t key;
        size_t size;
        int shmid;
        void *p_shm;
        long line_total;
        long line_offsets[MAX_SPLIT_FILE_LINES];
        long *p_line_offsets;
        int64_t shmid_old;
        void *p_shm_old;

        if ((fd = open(filename, O_RDONLY)) < 0)
        {
                log_error("open(%s) error (%d)\n", filename, errno);
                return -1;
        }

        if (fstat(fd, &sb) < 0)
        {
                log_error("fstat(fd) error (%d)\n", errno);
                return -1;
        }

        data_len = (size_t)sb.st_size;
        p_data = mmap(NULL, data_len, PROT_READ, MAP_SHARED, fd, 0L);
        if (p_data == MAP_FAILED)
        {
                log_error("mmap() error (%d)\n", errno);
                return -2;
        }

        if (close(fd) < 0)
        {
                log_error("close(fd) error (%d)\n", errno);
                return -1;
        }

        line_total = split_data_lines(p_data, SCREEN_COLS, line_offsets, MAX_SPLIT_FILE_LINES);
        if (line_total >= MAX_SPLIT_FILE_LINES)
        {
                log_error("split_data_lines() truncated over limit lines\n");
        }

        // Allocate shared memory
        proj_id = (int)(time(NULL) % getpid());
        key = ftok(filename, proj_id);
        if (key == -1)
        {
                log_error("ftok(%s %d) error (%d)\n", filename, proj_id, errno);
                return -2;
        }

        size = sizeof(shmid) + sizeof(data_len) + sizeof(line_total) + data_len + 1 + sizeof(long) * (size_t)(line_total + 1);
        shmid = shmget(key, size, IPC_CREAT | IPC_EXCL | 0600);
        if (shmid == -1)
        {
                log_error("shmget(size = %d) error (%d)\n", size, errno);
                return -3;
        }
        p_shm = shmat(shmid, NULL, 0);
        if (p_shm == (void *)-1)
        {
                log_error("shmat(shmid=%d) error (%d)\n", shmid, errno);
                return -3;
        }

        *((int *)p_shm) = shmid;
        *((size_t *)(p_shm + sizeof(shmid))) = data_len;
        *((long *)(p_shm + sizeof(shmid) + sizeof(data_len))) = line_total;
        memcpy(p_shm + sizeof(shmid) + sizeof(data_len) + sizeof(line_total), p_data, data_len);

        if (munmap(p_data, data_len) < 0)
        {
                log_error("munmap() error (%d)\n", errno);
                return -2;
        }

        p_data = p_shm + sizeof(int) + sizeof(data_len) + sizeof(line_total);
        p_line_offsets = p_data + data_len + 1;
        memcpy(p_line_offsets, line_offsets, sizeof(long) * (size_t)(line_total + 1));

        if (trie_dict_get(p_trie_file_dict, filename, (int64_t *)&p_shm_old) == 1)
        {
                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;
                }

                if (shmctl((int)shmid_old, IPC_RMID, NULL) == -1)
                {
                        log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", (int)shmid_old, errno);
                        return -2;
                }
        }

        if (trie_dict_set(p_trie_file_dict, filename, (int64_t)p_shm) != 1)
        {
                log_error("trie_dict_set(%s) error\n", filename);

                if (shmctl(shmid, IPC_RMID, NULL) == -1)
                {
                        log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", shmid, errno);
                }

                return -4;
        }

        return 0;
}

int unload_file_shm(const char *filename)
{
        const void *p_shm;
        int shmid;

        if (trie_dict_get(p_trie_file_dict, filename, (int64_t *)&p_shm) != 1)
        {
                log_error("trie_dict_get(%s) not found\n", filename);
                return -1;
        }

        shmid = *((int *)p_shm);

        if (shmdt(p_shm) == -1)
        {
                log_error("shmdt(shmid=%d) error (%d)\n", shmid, errno);
        }

        if (shmctl((int)shmid, IPC_RMID, NULL) == -1)
        {
                log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", (int)shmid, errno);
        }

        if (trie_dict_del(p_trie_file_dict, filename) != 1)
        {
                log_error("trie_dict_del(%s) error\n", filename);
                return -2;
        }

        return 0;
}

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 *p_shm;

        if (p_trie_file_dict == NULL)
        {
                log_error("File loader not initialized\n");
                return NULL;
        }

        if (trie_dict_get(p_trie_file_dict, filename, (int64_t *)&p_shm) != 1) // Not exist
        {
                log_error("trie_dict_get(%s) not found\n", filename);
                return NULL;
        }

        *p_data_len = *((size_t *)(p_shm + sizeof(int)));
        *p_line_total = *((long *)(p_shm + sizeof(int) + sizeof(size_t)));
        *pp_data = p_shm + sizeof(int) + sizeof(size_t) + sizeof(long);
        *pp_line_offsets = *pp_data + *p_data_len + 1;

        return p_shm;
}
1	/***************************************************************************
2	file_loader.c - description
3	-------------------
4	Copyright : (C) 2004-2025 by Leaflet
5	Email : leaflet@leafok.com
6	***************************************************************************/
7
8	/***************************************************************************
9	* *
10	* This program is free software; you can redistribute it and/or modify *
11	* it under the terms of the GNU General Public License as published by *
12	* the Free Software Foundation; either version 3 of the License, or *
13	* (at your option) any later version. *
14	* *
15	***************************************************************************/
16
17	#include "file_loader.h"
18	#include "trie_dict.h"
19	#include "str_process.h"
20	#include "log.h"
21	#include <fcntl.h>
22	#include <errno.h>
23	#include <unistd.h>
24	#include <stdlib.h>
25	#include <string.h>
26	#include <time.h>
27	#include <sys/mman.h>
28	#include <sys/stat.h>
29	#include <sys/shm.h>
30	#include <sys/ipc.h>
31
32	#define MAX_SPLIT_FILE_LINES 65536
33
34	static TRIE_NODE *p_trie_file_dict = NULL;
35
36	int file_loader_init()
37	{
38	if (p_trie_file_dict != NULL)
39	{
40	log_error("File loader already initialized\n");
41	return -1;
42	}
43
44	p_trie_file_dict = trie_dict_create();
45	if (p_trie_file_dict == NULL)
46	{
47	log_error("trie_dict_create() error\n");
48	return -2;
49	}
50
51	return 0;
52	}
53
54	static void trie_file_dict_cleanup_cb(const char *filename, int64_t value)
55	{
56	const void p_shm = (const void )value;
57	int shmid = ((int )p_shm);
58
59	if (shmdt(p_shm) == -1)
60	{
61	log_error("shmdt(shmid=%d) error (%d)\n", shmid, errno);
62	}
63
64	if (shmctl(shmid, IPC_RMID, NULL) == -1)
65	{
66	log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", shmid, errno);
67	}
68	}
69
70	void file_loader_cleanup(void)
71	{
72	if (p_trie_file_dict == NULL)
73	{
74	return;
75	}
76
77	trie_dict_traverse(p_trie_file_dict, trie_file_dict_cleanup_cb);
78
79	trie_dict_destroy(p_trie_file_dict);
80	p_trie_file_dict = NULL;
81	}
82
83	int load_file_shm(const char *filename)
84	{
85	int fd;
86	struct stat sb;
87	void *p_data;
88	size_t data_len;
89	int proj_id;
90	key_t key;
91	size_t size;
92	int shmid;
93	void *p_shm;
94	long line_total;
95	long line_offsets[MAX_SPLIT_FILE_LINES];
96	long *p_line_offsets;
97	int64_t shmid_old;
98	void *p_shm_old;
99
100	if ((fd = open(filename, O_RDONLY)) < 0)
101	{
102	log_error("open(%s) error (%d)\n", filename, errno);
103	return -1;
104	}
105
106	if (fstat(fd, &sb) < 0)
107	{
108	log_error("fstat(fd) error (%d)\n", errno);
109	return -1;
110	}
111
112	data_len = (size_t)sb.st_size;
113	p_data = mmap(NULL, data_len, PROT_READ, MAP_SHARED, fd, 0L);
114	if (p_data == MAP_FAILED)
115	{
116	log_error("mmap() error (%d)\n", errno);
117	return -2;
118	}
119
120	if (close(fd) < 0)
121	{
122	log_error("close(fd) error (%d)\n", errno);
123	return -1;
124	}
125
126	line_total = split_data_lines(p_data, SCREEN_COLS, line_offsets, MAX_SPLIT_FILE_LINES);
127	if (line_total >= MAX_SPLIT_FILE_LINES)
128	{
129	log_error("split_data_lines() truncated over limit lines\n");
130	}
131
132	// Allocate shared memory
133	proj_id = (int)(time(NULL) % getpid());
134	key = ftok(filename, proj_id);
135	if (key == -1)
136	{
137	log_error("ftok(%s %d) error (%d)\n", filename, proj_id, errno);
138	return -2;
139	}
140
141	size = sizeof(shmid) + sizeof(data_len) + sizeof(line_total) + data_len + 1 + sizeof(long) * (size_t)(line_total + 1);
142	shmid = shmget(key, size, IPC_CREAT \| IPC_EXCL \| 0600);
143	if (shmid == -1)
144	{
145	log_error("shmget(size = %d) error (%d)\n", size, errno);
146	return -3;
147	}
148	p_shm = shmat(shmid, NULL, 0);
149	if (p_shm == (void *)-1)
150	{
151	log_error("shmat(shmid=%d) error (%d)\n", shmid, errno);
152	return -3;
153	}
154
155	((int )p_shm) = shmid;
156	((size_t )(p_shm + sizeof(shmid))) = data_len;
157	((long )(p_shm + sizeof(shmid) + sizeof(data_len))) = line_total;
158	memcpy(p_shm + sizeof(shmid) + sizeof(data_len) + sizeof(line_total), p_data, data_len);
159
160	if (munmap(p_data, data_len) < 0)
161	{
162	log_error("munmap() error (%d)\n", errno);
163	return -2;
164	}
165
166	p_data = p_shm + sizeof(int) + sizeof(data_len) + sizeof(line_total);
167	p_line_offsets = p_data + data_len + 1;
168	memcpy(p_line_offsets, line_offsets, sizeof(long) * (size_t)(line_total + 1));
169
170	if (trie_dict_get(p_trie_file_dict, filename, (int64_t *)&p_shm_old) == 1)
171	{
172	shmid_old = ((int )p_shm_old);
173
174	if (shmdt(p_shm_old) == -1)
175	{
176	log_error("shmdt(shmid=%d) error (%d)\n", shmid_old, errno);
177	return -3;
178	}
179
180	if (shmctl((int)shmid_old, IPC_RMID, NULL) == -1)
181	{
182	log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", (int)shmid_old, errno);
183	return -2;
184	}
185	}
186
187	if (trie_dict_set(p_trie_file_dict, filename, (int64_t)p_shm) != 1)
188	{
189	log_error("trie_dict_set(%s) error\n", filename);
190
191	if (shmctl(shmid, IPC_RMID, NULL) == -1)
192	{
193	log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", shmid, errno);
194	}
195
196	return -4;
197	}
198
199	return 0;
200	}
201
202	int unload_file_shm(const char *filename)
203	{
204	const void *p_shm;
205	int shmid;
206
207	if (trie_dict_get(p_trie_file_dict, filename, (int64_t *)&p_shm) != 1)
208	{
209	log_error("trie_dict_get(%s) not found\n", filename);
210	return -1;
211	}
212
213	shmid = ((int )p_shm);
214
215	if (shmdt(p_shm) == -1)
216	{
217	log_error("shmdt(shmid=%d) error (%d)\n", shmid, errno);
218	}
219
220	if (shmctl((int)shmid, IPC_RMID, NULL) == -1)
221	{
222	log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", (int)shmid, errno);
223	}
224
225	if (trie_dict_del(p_trie_file_dict, filename) != 1)
226	{
227	log_error("trie_dict_del(%s) error\n", filename);
228	return -2;
229	}
230
231	return 0;
232	}
233
234	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)
235	{
236	const void *p_shm;
237
238	if (p_trie_file_dict == NULL)
239	{
240	log_error("File loader not initialized\n");
241	return NULL;
242	}
243
244	if (trie_dict_get(p_trie_file_dict, filename, (int64_t *)&p_shm) != 1) // Not exist
245	{
246	log_error("trie_dict_get(%s) not found\n", filename);
247	return NULL;
248	}
249
250	p_data_len = ((size_t *)(p_shm + sizeof(int)));
251	p_line_total = ((long *)(p_shm + sizeof(int) + sizeof(size_t)));
252	*pp_data = p_shm + sizeof(int) + sizeof(size_t) + sizeof(long);
253	pp_line_offsets = pp_data + *p_data_len + 1;
254
255	return p_shm;
256	}
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