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>

struct shm_header_t
{
        int shmid;
        size_t data_len;
        long line_total;
};

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)
{
        int shmid = (int)value;

        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(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;

        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(struct shm_header_t) + 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;
        }

        ((struct shm_header_t *)p_shm)->shmid = shmid;
        ((struct shm_header_t *)p_shm)->data_len = data_len;
        ((struct shm_header_t *)p_shm)->line_total = line_total;
        memcpy(p_shm + sizeof(struct shm_header_t), 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(struct shm_header_t);
        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(shmid=%d) error (%d)\n", shmid, 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(const char *filename)
{
        int64_t shmid;

        if (trie_dict_get(p_trie_file_dict, filename, &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_readonly(const char *filename, size_t *p_data_len, long *p_line_total, const void **pp_data, const long **pp_line_offsets)
{
        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(shmid=%d) error (%d)\n", (int)shmid, errno);
                return NULL;
        }

        *p_data_len = ((struct shm_header_t *)p_shm)->data_len;
        *p_line_total = ((struct shm_header_t *)p_shm)->line_total;
        *pp_data = p_shm + sizeof(struct shm_header_t);
        *pp_line_offsets = *pp_data + *p_data_len + 1;

        return p_shm;
}

int detach_file_shm(const void *p_shm)
{
        if (p_shm == NULL)
        {
                return -2;
        }

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

        return 0;
}
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	struct shm_header_t
33	{
34	int shmid;
35	size_t data_len;
36	long line_total;
37	};
38
39	static TRIE_NODE *p_trie_file_dict = NULL;
40
41	int file_loader_init()
42	{
43	if (p_trie_file_dict != NULL)
44	{
45	log_error("File loader already initialized\n");
46	return -1;
47	}
48
49	p_trie_file_dict = trie_dict_create();
50	if (p_trie_file_dict == NULL)
51	{
52	log_error("trie_dict_create() error\n");
53	return -2;
54	}
55
56	return 0;
57	}
58
59	static void trie_file_dict_cleanup_cb(const char *filename, int64_t value)
60	{
61	int shmid = (int)value;
62
63	if (shmctl(shmid, IPC_RMID, NULL) == -1)
64	{
65	log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", shmid, errno);
66	}
67	}
68
69	void file_loader_cleanup(void)
70	{
71	if (p_trie_file_dict == NULL)
72	{
73	return;
74	}
75
76	trie_dict_traverse(p_trie_file_dict, trie_file_dict_cleanup_cb);
77	trie_dict_destroy(p_trie_file_dict);
78
79	p_trie_file_dict = NULL;
80	}
81
82	int load_file(const char *filename)
83	{
84	int fd;
85	struct stat sb;
86	void *p_data;
87	size_t data_len;
88	int proj_id;
89	key_t key;
90	size_t size;
91	int shmid;
92	void *p_shm;
93	long line_total;
94	long line_offsets[MAX_SPLIT_FILE_LINES];
95	long *p_line_offsets;
96	int64_t shmid_old;
97
98	if ((fd = open(filename, O_RDONLY)) < 0)
99	{
100	log_error("open(%s) error (%d)\n", filename, errno);
101	return -1;
102	}
103
104	if (fstat(fd, &sb) < 0)
105	{
106	log_error("fstat(fd) error (%d)\n", errno);
107	return -1;
108	}
109
110	data_len = (size_t)sb.st_size;
111	p_data = mmap(NULL, data_len, PROT_READ, MAP_SHARED, fd, 0L);
112	if (p_data == MAP_FAILED)
113	{
114	log_error("mmap() error (%d)\n", errno);
115	return -2;
116	}
117
118	if (close(fd) < 0)
119	{
120	log_error("close(fd) error (%d)\n", errno);
121	return -1;
122	}
123
124	line_total = split_data_lines(p_data, SCREEN_COLS, line_offsets, MAX_SPLIT_FILE_LINES);
125	if (line_total >= MAX_SPLIT_FILE_LINES)
126	{
127	log_error("split_data_lines() truncated over limit lines\n");
128	}
129
130	// Allocate shared memory
131	proj_id = (int)(time(NULL) % getpid());
132	key = ftok(filename, proj_id);
133	if (key == -1)
134	{
135	log_error("ftok(%s %d) error (%d)\n", filename, proj_id, errno);
136	return -2;
137	}
138
139	size = sizeof(struct shm_header_t) + data_len + 1 + sizeof(long) * (size_t)(line_total + 1);
140	shmid = shmget(key, size, IPC_CREAT \| IPC_EXCL \| 0600);
141	if (shmid == -1)
142	{
143	log_error("shmget(size = %d) error (%d)\n", size, errno);
144	return -3;
145	}
146	p_shm = shmat(shmid, NULL, 0);
147	if (p_shm == (void *)-1)
148	{
149	log_error("shmat(shmid=%d) error (%d)\n", shmid, errno);
150	return -3;
151	}
152
153	((struct shm_header_t *)p_shm)->shmid = shmid;
154	((struct shm_header_t *)p_shm)->data_len = data_len;
155	((struct shm_header_t *)p_shm)->line_total = line_total;
156	memcpy(p_shm + sizeof(struct shm_header_t), p_data, data_len);
157
158	if (munmap(p_data, data_len) < 0)
159	{
160	log_error("munmap() error (%d)\n", errno);
161	return -2;
162	}
163
164	p_data = p_shm + sizeof(struct shm_header_t);
165	p_line_offsets = p_data + data_len + 1;
166	memcpy(p_line_offsets, line_offsets, sizeof(long) * (size_t)(line_total + 1));
167
168	if (shmdt(p_shm) == -1)
169	{
170	log_error("shmdt(shmid=%d) error (%d)\n", shmid, errno);
171	return -3;
172	}
173
174	if (trie_dict_get(p_trie_file_dict, filename, &shmid_old) == 1)
175	{
176	if (shmctl((int)shmid_old, IPC_RMID, NULL) == -1)
177	{
178	log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", (int)shmid_old, errno);
179	return -2;
180	}
181	}
182
183	if (trie_dict_set(p_trie_file_dict, filename, (int64_t)shmid) != 1)
184	{
185	log_error("trie_dict_set(%s) error\n", filename);
186
187	if (shmctl(shmid, IPC_RMID, NULL) == -1)
188	{
189	log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", shmid, errno);
190	}
191
192	return -4;
193	}
194
195	return 0;
196	}
197
198	int unload_file(const char *filename)
199	{
200	int64_t shmid;
201
202	if (trie_dict_get(p_trie_file_dict, filename, &shmid) != 1)
203	{
204	log_error("trie_dict_get(%s) not found\n", filename);
205	return -1;
206	}
207
208	if (shmctl((int)shmid, IPC_RMID, NULL) == -1)
209	{
210	log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", (int)shmid, errno);
211	}
212
213	if (trie_dict_del(p_trie_file_dict, filename) != 1)
214	{
215	log_error("trie_dict_del(%s) error\n", filename);
216	return -2;
217	}
218
219	return 0;
220	}
221
222	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)
223	{
224	int64_t shmid;
225	const void *p_shm;
226
227	if (p_trie_file_dict == NULL)
228	{
229	log_error("File loader not initialized\n");
230	return NULL;
231	}
232
233	if (trie_dict_get(p_trie_file_dict, filename, &shmid) != 1) // Not exist
234	{
235	log_error("trie_dict_get(%s) not found\n", filename);
236	return NULL;
237	}
238
239	p_shm = shmat((int)shmid, NULL, SHM_RDONLY);
240	if (p_shm == (void *)-1)
241	{
242	log_error("shmat(shmid=%d) error (%d)\n", (int)shmid, errno);
243	return NULL;
244	}
245
246	p_data_len = ((struct shm_header_t )p_shm)->data_len;
247	p_line_total = ((struct shm_header_t )p_shm)->line_total;
248	*pp_data = p_shm + sizeof(struct shm_header_t);
249	pp_line_offsets = pp_data + *p_data_len + 1;
250
251	return p_shm;
252	}
253
254	int detach_file_shm(const void *p_shm)
255	{
256	if (p_shm == NULL)
257	{
258	return -2;
259	}
260
261	if (shmdt(p_shm) == -1)
262	{
263	log_error("shmdt() error (%d)\n", errno);
264	return -1;
265	}
266
267	return 0;
268	}
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