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

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)
{
        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(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 (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 = ((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;
}
1	sysadm	1.1	/***************************************************************************
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	sysadm	1.3	#include <string.h>
26			#include <time.h>
27	sysadm	1.1	#include <sys/mman.h>
28			#include <sys/stat.h>
29	sysadm	1.3	#include <sys/shm.h>
30			#include <sys/ipc.h>
31
32			#define MAX_SPLIT_FILE_LINES 65536
33	sysadm	1.1
34	sysadm	1.8	struct shm_header_t
35			{
36			int shmid;
37			size_t data_len;
38			long line_total;
39			};
40
41	sysadm	1.1	static TRIE_NODE *p_trie_file_dict = NULL;
42
43	sysadm	1.3	int file_loader_init()
44	sysadm	1.1	{
45	sysadm	1.3	if (p_trie_file_dict != NULL)
46	sysadm	1.1	{
47			log_error("File loader already initialized\n");
48			return -1;
49			}
50
51			p_trie_file_dict = trie_dict_create();
52			if (p_trie_file_dict == NULL)
53			{
54			log_error("trie_dict_create() error\n");
55			return -2;
56			}
57
58			return 0;
59			}
60
61	sysadm	1.6	static void trie_file_dict_cleanup_cb(const char *filename, int64_t value)
62	sysadm	1.1	{
63	sysadm	1.6	const void p_shm = (const void )value;
64			int shmid = ((int )p_shm);
65
66			if (shmdt(p_shm) == -1)
67			{
68			log_error("shmdt(shmid=%d) error (%d)\n", shmid, errno);
69			}
70
71			if (shmctl(shmid, IPC_RMID, NULL) == -1)
72	sysadm	1.1	{
73	sysadm	1.6	log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", shmid, errno);
74	sysadm	1.1	}
75	sysadm	1.3	}
76	sysadm	1.1
77	sysadm	1.3	void file_loader_cleanup(void)
78			{
79			if (p_trie_file_dict == NULL)
80	sysadm	1.1	{
81	sysadm	1.3	return;
82	sysadm	1.1	}
83
84	sysadm	1.3	trie_dict_traverse(p_trie_file_dict, trie_file_dict_cleanup_cb);
85	sysadm	1.6
86	sysadm	1.3	trie_dict_destroy(p_trie_file_dict);
87	sysadm	1.6	p_trie_file_dict = NULL;
88	sysadm	1.1	}
89
90	sysadm	1.3	int load_file_shm(const char *filename)
91	sysadm	1.1	{
92			int fd;
93			struct stat sb;
94			void *p_data;
95	sysadm	1.3	size_t data_len;
96			int proj_id;
97			key_t key;
98	sysadm	1.1	size_t size;
99	sysadm	1.3	int shmid;
100			void *p_shm;
101			long line_total;
102			long line_offsets[MAX_SPLIT_FILE_LINES];
103			long *p_line_offsets;
104	sysadm	1.6	int64_t shmid_old;
105			void *p_shm_old;
106	sysadm	1.1
107			if ((fd = open(filename, O_RDONLY)) < 0)
108			{
109			log_error("open(%s) error (%d)\n", filename, errno);
110			return -1;
111			}
112
113			if (fstat(fd, &sb) < 0)
114			{
115			log_error("fstat(fd) error (%d)\n", errno);
116			return -1;
117			}
118
119	sysadm	1.3	data_len = (size_t)sb.st_size;
120			p_data = mmap(NULL, data_len, PROT_READ, MAP_SHARED, fd, 0L);
121	sysadm	1.1	if (p_data == MAP_FAILED)
122			{
123			log_error("mmap() error (%d)\n", errno);
124			return -2;
125			}
126
127			if (close(fd) < 0)
128			{
129			log_error("close(fd) error (%d)\n", errno);
130			return -1;
131			}
132
133	sysadm	1.3	line_total = split_data_lines(p_data, SCREEN_COLS, line_offsets, MAX_SPLIT_FILE_LINES);
134			if (line_total >= MAX_SPLIT_FILE_LINES)
135	sysadm	1.1	{
136	sysadm	1.3	log_error("split_data_lines() truncated over limit lines\n");
137			}
138	sysadm	1.1
139	sysadm	1.3	// Allocate shared memory
140			proj_id = (int)(time(NULL) % getpid());
141			key = ftok(filename, proj_id);
142			if (key == -1)
143			{
144			log_error("ftok(%s %d) error (%d)\n", filename, proj_id, errno);
145			return -2;
146			}
147	sysadm	1.1
148	sysadm	1.8	size = sizeof(struct shm_header_t) + data_len + 1 + sizeof(long) * (size_t)(line_total + 1);
149	sysadm	1.3	shmid = shmget(key, size, IPC_CREAT \| IPC_EXCL \| 0600);
150			if (shmid == -1)
151			{
152			log_error("shmget(size = %d) error (%d)\n", size, errno);
153			return -3;
154			}
155			p_shm = shmat(shmid, NULL, 0);
156			if (p_shm == (void *)-1)
157			{
158	sysadm	1.6	log_error("shmat(shmid=%d) error (%d)\n", shmid, errno);
159	sysadm	1.3	return -3;
160			}
161
162	sysadm	1.8	((struct shm_header_t *)p_shm)->shmid = shmid;
163			((struct shm_header_t *)p_shm)->data_len = data_len;
164			((struct shm_header_t *)p_shm)->line_total = line_total;
165			memcpy(p_shm + sizeof(struct shm_header_t), p_data, data_len);
166	sysadm	1.1
167	sysadm	1.3	if (munmap(p_data, data_len) < 0)
168			{
169			log_error("munmap() error (%d)\n", errno);
170			return -2;
171			}
172	sysadm	1.1
173	sysadm	1.8	p_data = p_shm + sizeof(struct shm_header_t);
174	sysadm	1.3	p_line_offsets = p_data + data_len + 1;
175			memcpy(p_line_offsets, line_offsets, sizeof(long) * (size_t)(line_total + 1));
176	sysadm	1.1
177	sysadm	1.6	if (trie_dict_get(p_trie_file_dict, filename, (int64_t *)&p_shm_old) == 1)
178	sysadm	1.3	{
179	sysadm	1.6	shmid_old = ((int )p_shm_old);
180
181			if (shmdt(p_shm_old) == -1)
182			{
183			log_error("shmdt(shmid=%d) error (%d)\n", shmid_old, errno);
184			return -3;
185			}
186	sysadm	1.3
187			if (shmctl((int)shmid_old, IPC_RMID, NULL) == -1)
188	sysadm	1.1	{
189	sysadm	1.3	log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", (int)shmid_old, errno);
190			return -2;
191	sysadm	1.1	}
192			}
193
194	sysadm	1.6	if (trie_dict_set(p_trie_file_dict, filename, (int64_t)p_shm) != 1)
195	sysadm	1.3	{
196			log_error("trie_dict_set(%s) error\n", filename);
197
198			if (shmctl(shmid, IPC_RMID, NULL) == -1)
199			{
200			log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", shmid, errno);
201			}
202	sysadm	1.1
203	sysadm	1.3	return -4;
204			}
205	sysadm	1.1
206			return 0;
207			}
208
209	sysadm	1.3	int unload_file_shm(const char *filename)
210	sysadm	1.1	{
211	sysadm	1.6	const void *p_shm;
212			int shmid;
213	sysadm	1.1
214	sysadm	1.6	if (trie_dict_get(p_trie_file_dict, filename, (int64_t *)&p_shm) != 1)
215	sysadm	1.1	{
216			log_error("trie_dict_get(%s) not found\n", filename);
217			return -1;
218			}
219
220	sysadm	1.6	shmid = ((int )p_shm);
221
222			if (shmdt(p_shm) == -1)
223			{
224			log_error("shmdt(shmid=%d) error (%d)\n", shmid, errno);
225			}
226
227	sysadm	1.3	if (shmctl((int)shmid, IPC_RMID, NULL) == -1)
228	sysadm	1.1	{
229	sysadm	1.3	log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", (int)shmid, errno);
230	sysadm	1.1	}
231
232			if (trie_dict_del(p_trie_file_dict, filename) != 1)
233			{
234			log_error("trie_dict_del(%s) error\n", filename);
235			return -2;
236			}
237
238			return 0;
239			}
240
241	sysadm	1.6	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)
242	sysadm	1.1	{
243	sysadm	1.3	const void *p_shm;
244	sysadm	1.1
245	sysadm	1.3	if (p_trie_file_dict == NULL)
246	sysadm	1.1	{
247			log_error("File loader not initialized\n");
248			return NULL;
249			}
250
251	sysadm	1.6	if (trie_dict_get(p_trie_file_dict, filename, (int64_t *)&p_shm) != 1) // Not exist
252	sysadm	1.1	{
253			log_error("trie_dict_get(%s) not found\n", filename);
254			return NULL;
255			}
256
257	sysadm	1.8	p_data_len = ((struct shm_header_t )p_shm)->data_len;
258			p_line_total = ((struct shm_header_t )p_shm)->line_total;
259			*pp_data = p_shm + sizeof(struct shm_header_t);
260	sysadm	1.6	pp_line_offsets = pp_data + *p_data_len + 1;
261	sysadm	1.3
262			return p_shm;
263	sysadm	1.1	}
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