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)
{
        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	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	1.11	int shmid = (int)value;
64	sysadm	1.6
65			if (shmctl(shmid, IPC_RMID, NULL) == -1)
66	sysadm	1.1	{
67	sysadm	1.6	log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", shmid, errno);
68	sysadm	1.1	}
69	sysadm	1.3	}
70	sysadm	1.1
71	sysadm	1.3	void file_loader_cleanup(void)
72			{
73			if (p_trie_file_dict == NULL)
74	sysadm	1.1	{
75	sysadm	1.3	return;
76	sysadm	1.1	}
77
78	sysadm	1.3	trie_dict_traverse(p_trie_file_dict, trie_file_dict_cleanup_cb);
79	sysadm	1.11	trie_dict_destroy(p_trie_file_dict);
80	sysadm	1.6
81			p_trie_file_dict = NULL;
82	sysadm	1.1	}
83
84	sysadm	1.11	int load_file(const char *filename)
85	sysadm	1.1	{
86			int fd;
87			struct stat sb;
88			void *p_data;
89	sysadm	1.3	size_t data_len;
90			int proj_id;
91			key_t key;
92	sysadm	1.1	size_t size;
93	sysadm	1.3	int shmid;
94			void *p_shm;
95			long line_total;
96			long line_offsets[MAX_SPLIT_FILE_LINES];
97			long *p_line_offsets;
98	sysadm	1.6	int64_t shmid_old;
99	sysadm	1.1
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	sysadm	1.3	data_len = (size_t)sb.st_size;
113			p_data = mmap(NULL, data_len, PROT_READ, MAP_SHARED, fd, 0L);
114	sysadm	1.1	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	sysadm	1.3	line_total = split_data_lines(p_data, SCREEN_COLS, line_offsets, MAX_SPLIT_FILE_LINES);
127			if (line_total >= MAX_SPLIT_FILE_LINES)
128	sysadm	1.1	{
129	sysadm	1.3	log_error("split_data_lines() truncated over limit lines\n");
130			}
131	sysadm	1.1
132	sysadm	1.3	// 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	sysadm	1.1
141	sysadm	1.8	size = sizeof(struct shm_header_t) + data_len + 1 + sizeof(long) * (size_t)(line_total + 1);
142	sysadm	1.3	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	sysadm	1.6	log_error("shmat(shmid=%d) error (%d)\n", shmid, errno);
152	sysadm	1.3	return -3;
153			}
154
155	sysadm	1.8	((struct shm_header_t *)p_shm)->shmid = shmid;
156			((struct shm_header_t *)p_shm)->data_len = data_len;
157			((struct shm_header_t *)p_shm)->line_total = line_total;
158			memcpy(p_shm + sizeof(struct shm_header_t), p_data, data_len);
159	sysadm	1.1
160	sysadm	1.3	if (munmap(p_data, data_len) < 0)
161			{
162			log_error("munmap() error (%d)\n", errno);
163			return -2;
164			}
165	sysadm	1.1
166	sysadm	1.8	p_data = p_shm + sizeof(struct shm_header_t);
167	sysadm	1.3	p_line_offsets = p_data + data_len + 1;
168			memcpy(p_line_offsets, line_offsets, sizeof(long) * (size_t)(line_total + 1));
169	sysadm	1.1
170	sysadm	1.11	if (shmdt(p_shm) == -1)
171	sysadm	1.9	{
172	sysadm	1.11	log_error("shmdt(shmid=%d) error (%d)\n", shmid, errno);
173	sysadm	1.9	return -3;
174			}
175
176	sysadm	1.11	if (trie_dict_get(p_trie_file_dict, filename, &shmid_old) == 1)
177	sysadm	1.3	{
178			if (shmctl((int)shmid_old, IPC_RMID, NULL) == -1)
179	sysadm	1.1	{
180	sysadm	1.3	log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", (int)shmid_old, errno);
181			return -2;
182	sysadm	1.1	}
183			}
184
185	sysadm	1.11	if (trie_dict_set(p_trie_file_dict, filename, (int64_t)shmid) != 1)
186	sysadm	1.3	{
187			log_error("trie_dict_set(%s) error\n", filename);
188
189			if (shmctl(shmid, IPC_RMID, NULL) == -1)
190			{
191			log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", shmid, errno);
192			}
193	sysadm	1.1
194	sysadm	1.3	return -4;
195			}
196	sysadm	1.1
197			return 0;
198			}
199
200	sysadm	1.11	int unload_file(const char *filename)
201	sysadm	1.1	{
202	sysadm	1.11	int64_t shmid;
203	sysadm	1.1
204	sysadm	1.11	if (trie_dict_get(p_trie_file_dict, filename, &shmid) != 1)
205	sysadm	1.1	{
206			log_error("trie_dict_get(%s) not found\n", filename);
207			return -1;
208			}
209
210	sysadm	1.3	if (shmctl((int)shmid, IPC_RMID, NULL) == -1)
211	sysadm	1.1	{
212	sysadm	1.3	log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", (int)shmid, errno);
213	sysadm	1.1	}
214
215			if (trie_dict_del(p_trie_file_dict, filename) != 1)
216			{
217			log_error("trie_dict_del(%s) error\n", filename);
218			return -2;
219			}
220
221			return 0;
222			}
223
224	sysadm	1.11	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)
225	sysadm	1.1	{
226	sysadm	1.11	int64_t shmid;
227	sysadm	1.3	const void *p_shm;
228	sysadm	1.1
229	sysadm	1.3	if (p_trie_file_dict == NULL)
230	sysadm	1.1	{
231			log_error("File loader not initialized\n");
232			return NULL;
233			}
234
235	sysadm	1.11	if (trie_dict_get(p_trie_file_dict, filename, &shmid) != 1) // Not exist
236	sysadm	1.1	{
237			log_error("trie_dict_get(%s) not found\n", filename);
238			return NULL;
239			}
240
241	sysadm	1.11	p_shm = shmat((int)shmid, NULL, SHM_RDONLY);
242			if (p_shm == (void *)-1)
243			{
244			log_error("shmat(shmid=%d) error (%d)\n", (int)shmid, errno);
245			return NULL;
246			}
247
248	sysadm	1.8	p_data_len = ((struct shm_header_t )p_shm)->data_len;
249			p_line_total = ((struct shm_header_t )p_shm)->line_total;
250			*pp_data = p_shm + sizeof(struct shm_header_t);
251	sysadm	1.6	pp_line_offsets = pp_data + *p_data_len + 1;
252	sysadm	1.3
253			return p_shm;
254	sysadm	1.1	}
255	sysadm	1.11
256			int detach_file_shm(const void *p_shm)
257			{
258			if (p_shm == NULL)
259			{
260			return -2;
261			}
262
263			if (shmdt(p_shm) == -1)
264			{
265			log_error("shmdt() error (%d)\n", errno);
266			return -1;
267			}
268
269			return 0;
270			}
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