lbbs/src/file_loader.c

/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
 * file_loader
 *   - shared memory based file loader
 *
 * Copyright (C) 2004-2025 by Leaflet <leaflet@leafok.com>
 */

#include "file_loader.h"
#include "log.h"
#include "str_process.h"
#include "trie_dict.h"
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <sys/ipc.h>
#include <sys/mman.h>
#include <sys/shm.h>
#include <sys/stat.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 (shmid != 0 && 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, 1, NULL);

        // 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((char *)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 = (char *)p_shm + sizeof(struct shm_header_t);
        p_line_offsets = (long *)((char *)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 (shmid != 0 && 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 = (char *)p_shm + sizeof(struct shm_header_t);
        *pp_line_offsets = (const long *)((const char *)(*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	1.18	/* SPDX-License-Identifier: GPL-3.0-or-later */
2			/*
3			* file_loader
4			* - shared memory based file loader
5			*
6			* Copyright (C) 2004-2025 by Leaflet <leaflet@leafok.com>
7			*/
8	sysadm	1.1
9			#include "file_loader.h"
10	sysadm	1.15	#include "log.h"
11			#include "str_process.h"
12	sysadm	1.1	#include "trie_dict.h"
13	sysadm	1.15	#include <errno.h>
14	sysadm	1.1	#include <fcntl.h>
15			#include <stdlib.h>
16	sysadm	1.3	#include <string.h>
17			#include <time.h>
18	sysadm	1.15	#include <unistd.h>
19			#include <sys/ipc.h>
20	sysadm	1.1	#include <sys/mman.h>
21	sysadm	1.15	#include <sys/shm.h>
22	sysadm	1.1	#include <sys/stat.h>
23	sysadm	1.3
24	sysadm	1.8	struct shm_header_t
25			{
26			int shmid;
27			size_t data_len;
28			long line_total;
29			};
30
31	sysadm	1.1	static TRIE_NODE *p_trie_file_dict = NULL;
32
33	sysadm	1.3	int file_loader_init()
34	sysadm	1.1	{
35	sysadm	1.3	if (p_trie_file_dict != NULL)
36	sysadm	1.1	{
37			log_error("File loader already initialized\n");
38			return -1;
39			}
40
41			p_trie_file_dict = trie_dict_create();
42			if (p_trie_file_dict == NULL)
43			{
44			log_error("trie_dict_create() error\n");
45			return -2;
46			}
47
48			return 0;
49			}
50
51	sysadm	1.6	static void trie_file_dict_cleanup_cb(const char *filename, int64_t value)
52	sysadm	1.1	{
53	sysadm	1.11	int shmid = (int)value;
54	sysadm	1.6
55	sysadm	1.19	if (shmid != 0 && shmctl(shmid, IPC_RMID, NULL) == -1)
56	sysadm	1.1	{
57	sysadm	1.6	log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", shmid, errno);
58	sysadm	1.1	}
59	sysadm	1.3	}
60	sysadm	1.1
61	sysadm	1.3	void file_loader_cleanup(void)
62			{
63			if (p_trie_file_dict == NULL)
64	sysadm	1.1	{
65	sysadm	1.3	return;
66	sysadm	1.1	}
67
68	sysadm	1.3	trie_dict_traverse(p_trie_file_dict, trie_file_dict_cleanup_cb);
69	sysadm	1.11	trie_dict_destroy(p_trie_file_dict);
70	sysadm	1.6
71			p_trie_file_dict = NULL;
72	sysadm	1.1	}
73
74	sysadm	1.11	int load_file(const char *filename)
75	sysadm	1.1	{
76			int fd;
77			struct stat sb;
78			void *p_data;
79	sysadm	1.3	size_t data_len;
80			int proj_id;
81			key_t key;
82	sysadm	1.1	size_t size;
83	sysadm	1.3	int shmid;
84			void *p_shm;
85			long line_total;
86			long line_offsets[MAX_SPLIT_FILE_LINES];
87			long *p_line_offsets;
88	sysadm	1.6	int64_t shmid_old;
89	sysadm	1.1
90			if ((fd = open(filename, O_RDONLY)) < 0)
91			{
92			log_error("open(%s) error (%d)\n", filename, errno);
93			return -1;
94			}
95
96			if (fstat(fd, &sb) < 0)
97			{
98			log_error("fstat(fd) error (%d)\n", errno);
99			return -1;
100			}
101
102	sysadm	1.3	data_len = (size_t)sb.st_size;
103			p_data = mmap(NULL, data_len, PROT_READ, MAP_SHARED, fd, 0L);
104	sysadm	1.1	if (p_data == MAP_FAILED)
105			{
106			log_error("mmap() error (%d)\n", errno);
107			return -2;
108			}
109
110			if (close(fd) < 0)
111			{
112			log_error("close(fd) error (%d)\n", errno);
113			return -1;
114			}
115
116	sysadm	1.16	line_total = split_data_lines(p_data, SCREEN_COLS, line_offsets, MAX_SPLIT_FILE_LINES, 1, NULL);
117	sysadm	1.1
118	sysadm	1.3	// Allocate shared memory
119			proj_id = (int)(time(NULL) % getpid());
120			key = ftok(filename, proj_id);
121			if (key == -1)
122			{
123			log_error("ftok(%s %d) error (%d)\n", filename, proj_id, errno);
124			return -2;
125			}
126	sysadm	1.1
127	sysadm	1.8	size = sizeof(struct shm_header_t) + data_len + 1 + sizeof(long) * (size_t)(line_total + 1);
128	sysadm	1.3	shmid = shmget(key, size, IPC_CREAT \| IPC_EXCL \| 0600);
129			if (shmid == -1)
130			{
131			log_error("shmget(size = %d) error (%d)\n", size, errno);
132			return -3;
133			}
134			p_shm = shmat(shmid, NULL, 0);
135			if (p_shm == (void *)-1)
136			{
137	sysadm	1.6	log_error("shmat(shmid=%d) error (%d)\n", shmid, errno);
138	sysadm	1.3	return -3;
139			}
140
141	sysadm	1.8	((struct shm_header_t *)p_shm)->shmid = shmid;
142			((struct shm_header_t *)p_shm)->data_len = data_len;
143			((struct shm_header_t *)p_shm)->line_total = line_total;
144	sysadm	1.17	memcpy((char *)p_shm + sizeof(struct shm_header_t), p_data, data_len);
145	sysadm	1.1
146	sysadm	1.3	if (munmap(p_data, data_len) < 0)
147			{
148			log_error("munmap() error (%d)\n", errno);
149			return -2;
150			}
151	sysadm	1.1
152	sysadm	1.17	p_data = (char *)p_shm + sizeof(struct shm_header_t);
153			p_line_offsets = (long )((char )p_data + data_len + 1);
154	sysadm	1.3	memcpy(p_line_offsets, line_offsets, sizeof(long) * (size_t)(line_total + 1));
155	sysadm	1.1
156	sysadm	1.11	if (shmdt(p_shm) == -1)
157	sysadm	1.9	{
158	sysadm	1.11	log_error("shmdt(shmid=%d) error (%d)\n", shmid, errno);
159	sysadm	1.9	return -3;
160			}
161
162	sysadm	1.11	if (trie_dict_get(p_trie_file_dict, filename, &shmid_old) == 1)
163	sysadm	1.3	{
164			if (shmctl((int)shmid_old, IPC_RMID, NULL) == -1)
165	sysadm	1.1	{
166	sysadm	1.3	log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", (int)shmid_old, errno);
167			return -2;
168	sysadm	1.1	}
169			}
170
171	sysadm	1.11	if (trie_dict_set(p_trie_file_dict, filename, (int64_t)shmid) != 1)
172	sysadm	1.3	{
173			log_error("trie_dict_set(%s) error\n", filename);
174
175	sysadm	1.19	if (shmid != 0 && shmctl(shmid, IPC_RMID, NULL) == -1)
176	sysadm	1.3	{
177			log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", shmid, errno);
178			}
179	sysadm	1.1
180	sysadm	1.3	return -4;
181			}
182	sysadm	1.1
183			return 0;
184			}
185
186	sysadm	1.11	int unload_file(const char *filename)
187	sysadm	1.1	{
188	sysadm	1.11	int64_t shmid;
189	sysadm	1.1
190	sysadm	1.11	if (trie_dict_get(p_trie_file_dict, filename, &shmid) != 1)
191	sysadm	1.1	{
192			log_error("trie_dict_get(%s) not found\n", filename);
193			return -1;
194			}
195
196	sysadm	1.3	if (shmctl((int)shmid, IPC_RMID, NULL) == -1)
197	sysadm	1.1	{
198	sysadm	1.3	log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", (int)shmid, errno);
199	sysadm	1.1	}
200
201			if (trie_dict_del(p_trie_file_dict, filename) != 1)
202			{
203			log_error("trie_dict_del(%s) error\n", filename);
204			return -2;
205			}
206
207			return 0;
208			}
209
210	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)
211	sysadm	1.1	{
212	sysadm	1.11	int64_t shmid;
213	sysadm	1.3	const void *p_shm;
214	sysadm	1.1
215	sysadm	1.3	if (p_trie_file_dict == NULL)
216	sysadm	1.1	{
217			log_error("File loader not initialized\n");
218			return NULL;
219			}
220
221	sysadm	1.11	if (trie_dict_get(p_trie_file_dict, filename, &shmid) != 1) // Not exist
222	sysadm	1.1	{
223			log_error("trie_dict_get(%s) not found\n", filename);
224			return NULL;
225			}
226
227	sysadm	1.11	p_shm = shmat((int)shmid, NULL, SHM_RDONLY);
228			if (p_shm == (void *)-1)
229			{
230			log_error("shmat(shmid=%d) error (%d)\n", (int)shmid, errno);
231			return NULL;
232			}
233
234	sysadm	1.8	p_data_len = ((struct shm_header_t )p_shm)->data_len;
235			p_line_total = ((struct shm_header_t )p_shm)->line_total;
236	sysadm	1.17	pp_data = (char )p_shm + sizeof(struct shm_header_t);
237			pp_line_offsets = (const long )((const char )(pp_data) + *p_data_len + 1);
238	sysadm	1.3
239			return p_shm;
240	sysadm	1.1	}
241	sysadm	1.11
242			int detach_file_shm(const void *p_shm)
243			{
244			if (p_shm == NULL)
245			{
246			return -2;
247			}
248
249			if (shmdt(p_shm) == -1)
250			{
251			log_error("shmdt() error (%d)\n", errno);
252			return -1;
253			}
254
255			return 0;
256			}
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