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 shmid)
{
        if (shmctl((int)shmid, IPC_RMID, NULL) == -1)
        {
                log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", (int)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;
        int64_t shmid_old;
        void *p_shm;
        long line_total;
        long line_offsets[MAX_SPLIT_FILE_LINES];
        long *p_line_offsets;

        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(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() error (%d)\n", errno);
                return -3;
        }

        *((size_t *)p_shm) = data_len;
        *((long *)(p_shm + sizeof(data_len))) = line_total;
        memcpy(p_shm + 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(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 (shmdt(p_shm) == -1)
        {
                log_error("shmdt() error (%d)\n", errno);
                return -3;
        }

        if (trie_dict_get(p_trie_file_dict, filename, &shmid_old) == 1)
        {
                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)shmid) != 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)
{
        int64_t shmid = 0;

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

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

        p_shm = shmat((int)shmid, NULL, SHM_RDONLY);
        if (p_shm == (void *)-1)
        {
                log_error("shmat() error (%d)\n", errno);
                return NULL;
        }

        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 shmid)
55	{
56	if (shmctl((int)shmid, IPC_RMID, NULL) == -1)
57	{
58	log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", (int)shmid, errno);
59	}
60	}
61
62	void file_loader_cleanup(void)
63	{
64	if (p_trie_file_dict == NULL)
65	{
66	return;
67	}
68
69	trie_dict_traverse(p_trie_file_dict, trie_file_dict_cleanup_cb);
70	trie_dict_destroy(p_trie_file_dict);
71	p_trie_file_dict = NULL;
72	}
73
74	int load_file_shm(const char *filename)
75	{
76	int fd;
77	struct stat sb;
78	void *p_data;
79	size_t data_len;
80	int proj_id;
81	key_t key;
82	size_t size;
83	int shmid;
84	int64_t shmid_old;
85	void *p_shm;
86	long line_total;
87	long line_offsets[MAX_SPLIT_FILE_LINES];
88	long *p_line_offsets;
89
90	if ((fd = open(filename, O_RDONLY)) < 0)
91	{
92	log_error("open(%s) error (%d)\n", filename, errno);
93	return -1;
94	}
95
96	if (fstat(fd, &sb) < 0)
97	{
98	log_error("fstat(fd) error (%d)\n", errno);
99	return -1;
100	}
101
102	data_len = (size_t)sb.st_size;
103	p_data = mmap(NULL, data_len, PROT_READ, MAP_SHARED, fd, 0L);
104	if (p_data == MAP_FAILED)
105	{
106	log_error("mmap() error (%d)\n", errno);
107	return -2;
108	}
109
110	if (close(fd) < 0)
111	{
112	log_error("close(fd) error (%d)\n", errno);
113	return -1;
114	}
115
116	line_total = split_data_lines(p_data, SCREEN_COLS, line_offsets, MAX_SPLIT_FILE_LINES);
117	if (line_total >= MAX_SPLIT_FILE_LINES)
118	{
119	log_error("split_data_lines() truncated over limit lines\n");
120	}
121
122	// Allocate shared memory
123	proj_id = (int)(time(NULL) % getpid());
124	key = ftok(filename, proj_id);
125	if (key == -1)
126	{
127	log_error("ftok(%s %d) error (%d)\n", filename, proj_id, errno);
128	return -2;
129	}
130
131	size = sizeof(data_len) + sizeof(line_total) + data_len + 1 + sizeof(long) * (size_t)(line_total + 1);
132	shmid = shmget(key, size, IPC_CREAT \| IPC_EXCL \| 0600);
133	if (shmid == -1)
134	{
135	log_error("shmget(size = %d) error (%d)\n", size, errno);
136	return -3;
137	}
138	p_shm = shmat(shmid, NULL, 0);
139	if (p_shm == (void *)-1)
140	{
141	log_error("shmat() error (%d)\n", errno);
142	return -3;
143	}
144
145	((size_t )p_shm) = data_len;
146	((long )(p_shm + sizeof(data_len))) = line_total;
147	memcpy(p_shm + sizeof(data_len) + sizeof(line_total), p_data, data_len);
148
149	if (munmap(p_data, data_len) < 0)
150	{
151	log_error("munmap() error (%d)\n", errno);
152	return -2;
153	}
154
155	p_data = p_shm + sizeof(data_len) + sizeof(line_total);
156	p_line_offsets = p_data + data_len + 1;
157	memcpy(p_line_offsets, line_offsets, sizeof(long) * (size_t)(line_total + 1));
158
159	if (shmdt(p_shm) == -1)
160	{
161	log_error("shmdt() error (%d)\n", errno);
162	return -3;
163	}
164
165	if (trie_dict_get(p_trie_file_dict, filename, &shmid_old) == 1)
166	{
167	if (shmctl((int)shmid_old, IPC_RMID, NULL) == -1)
168	{
169	log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", (int)shmid_old, errno);
170	return -2;
171	}
172	}
173
174	if (trie_dict_set(p_trie_file_dict, filename, (int64_t)shmid) != 1)
175	{
176	log_error("trie_dict_set(%s) error\n", filename);
177
178	if (shmctl(shmid, IPC_RMID, NULL) == -1)
179	{
180	log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", shmid, errno);
181	}
182
183	return -4;
184	}
185
186	return 0;
187	}
188
189	int unload_file_shm(const char *filename)
190	{
191	int64_t shmid = 0;
192
193	if (trie_dict_get(p_trie_file_dict, filename, (int64_t *)&shmid) != 1)
194	{
195	log_error("trie_dict_get(%s) not found\n", filename);
196	return -1;
197	}
198
199	if (shmctl((int)shmid, IPC_RMID, NULL) == -1)
200	{
201	log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", (int)shmid, errno);
202	}
203
204	if (trie_dict_del(p_trie_file_dict, filename) != 1)
205	{
206	log_error("trie_dict_del(%s) error\n", filename);
207	return -2;
208	}
209
210	return 0;
211	}
212
213	const void get_file_shm(const char filename)
214	{
215	int64_t shmid;
216	const void *p_shm;
217
218	if (p_trie_file_dict == NULL)
219	{
220	log_error("File loader not initialized\n");
221	return NULL;
222	}
223
224	if (trie_dict_get(p_trie_file_dict, filename, &shmid) != 1) // Not exist
225	{
226	log_error("trie_dict_get(%s) not found\n", filename);
227	return NULL;
228	}
229
230	p_shm = shmat((int)shmid, NULL, SHM_RDONLY);
231	if (p_shm == (void *)-1)
232	{
233	log_error("shmat() error (%d)\n", errno);
234	return NULL;
235	}
236
237	return p_shm;
238	}
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