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	/***************************************************************************
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	struct shm_header_t
35	{
36	int shmid;
37	size_t data_len;
38	long line_total;
39	};
40
41	static TRIE_NODE *p_trie_file_dict = NULL;
42
43	int file_loader_init()
44	{
45	if (p_trie_file_dict != NULL)
46	{
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	static void trie_file_dict_cleanup_cb(const char *filename, int64_t value)
62	{
63	int shmid = (int)value;
64
65	if (shmctl(shmid, IPC_RMID, NULL) == -1)
66	{
67	log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", shmid, errno);
68	}
69	}
70
71	void file_loader_cleanup(void)
72	{
73	if (p_trie_file_dict == NULL)
74	{
75	return;
76	}
77
78	trie_dict_traverse(p_trie_file_dict, trie_file_dict_cleanup_cb);
79	trie_dict_destroy(p_trie_file_dict);
80
81	p_trie_file_dict = NULL;
82	}
83
84	int load_file(const char *filename)
85	{
86	int fd;
87	struct stat sb;
88	void *p_data;
89	size_t data_len;
90	int proj_id;
91	key_t key;
92	size_t size;
93	int shmid;
94	void *p_shm;
95	long line_total;
96	long line_offsets[MAX_SPLIT_FILE_LINES];
97	long *p_line_offsets;
98	int64_t shmid_old;
99
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	data_len = (size_t)sb.st_size;
113	p_data = mmap(NULL, data_len, PROT_READ, MAP_SHARED, fd, 0L);
114	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	line_total = split_data_lines(p_data, SCREEN_COLS, line_offsets, MAX_SPLIT_FILE_LINES);
127	if (line_total >= MAX_SPLIT_FILE_LINES)
128	{
129	log_error("split_data_lines() truncated over limit lines\n");
130	}
131
132	// 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
141	size = sizeof(struct shm_header_t) + data_len + 1 + sizeof(long) * (size_t)(line_total + 1);
142	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	log_error("shmat(shmid=%d) error (%d)\n", shmid, errno);
152	return -3;
153	}
154
155	((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
160	if (munmap(p_data, data_len) < 0)
161	{
162	log_error("munmap() error (%d)\n", errno);
163	return -2;
164	}
165
166	p_data = p_shm + sizeof(struct shm_header_t);
167	p_line_offsets = p_data + data_len + 1;
168	memcpy(p_line_offsets, line_offsets, sizeof(long) * (size_t)(line_total + 1));
169
170	if (shmdt(p_shm) == -1)
171	{
172	log_error("shmdt(shmid=%d) error (%d)\n", shmid, errno);
173	return -3;
174	}
175
176	if (trie_dict_get(p_trie_file_dict, filename, &shmid_old) == 1)
177	{
178	if (shmctl((int)shmid_old, IPC_RMID, NULL) == -1)
179	{
180	log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", (int)shmid_old, errno);
181	return -2;
182	}
183	}
184
185	if (trie_dict_set(p_trie_file_dict, filename, (int64_t)shmid) != 1)
186	{
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
194	return -4;
195	}
196
197	return 0;
198	}
199
200	int unload_file(const char *filename)
201	{
202	int64_t shmid;
203
204	if (trie_dict_get(p_trie_file_dict, filename, &shmid) != 1)
205	{
206	log_error("trie_dict_get(%s) not found\n", filename);
207	return -1;
208	}
209
210	if (shmctl((int)shmid, IPC_RMID, NULL) == -1)
211	{
212	log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", (int)shmid, errno);
213	}
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	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	{
226	int64_t shmid;
227	const void *p_shm;
228
229	if (p_trie_file_dict == NULL)
230	{
231	log_error("File loader not initialized\n");
232	return NULL;
233	}
234
235	if (trie_dict_get(p_trie_file_dict, filename, &shmid) != 1) // Not exist
236	{
237	log_error("trie_dict_get(%s) not found\n", filename);
238	return NULL;
239	}
240
241	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	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	pp_line_offsets = pp_data + *p_data_len + 1;
252
253	return p_shm;
254	}
255
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	}
webmaster@leafok.com	ViewVC Help
Powered by ViewVC 1.3.0-beta1