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);
}

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