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/* SPDX-License-Identifier: GPL-3.0-or-later */
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/*
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* file_loader
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* - shared memory based file loader
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*
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* Copyright (C) 2004-2025 Leaflet <leaflet@leafok.com>
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*/
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#include "file_loader.h"
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#include "log.h"
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#include "str_process.h"
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#include "trie_dict.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <sys/ipc.h>
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#include <sys/mman.h>
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#include <sys/shm.h>
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#include <sys/stat.h>
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struct shm_header_t
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{
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int shmid;
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size_t data_len;
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long line_total;
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};
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static TRIE_NODE *p_trie_file_dict = NULL;
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int file_loader_init()
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{
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if (p_trie_file_dict != NULL)
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{
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log_error("File loader already initialized\n");
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return -1;
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}
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p_trie_file_dict = trie_dict_create();
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if (p_trie_file_dict == NULL)
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{
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log_error("trie_dict_create() error\n");
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return -2;
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}
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return 0;
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}
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static void trie_file_dict_cleanup_cb(const char *filename, int64_t value)
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{
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int shmid = (int)value;
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if (shmid != 0 && shmctl(shmid, IPC_RMID, NULL) == -1)
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{
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log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", shmid, errno);
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}
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}
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void file_loader_cleanup(void)
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{
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if (p_trie_file_dict == NULL)
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{
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return;
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}
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trie_dict_traverse(p_trie_file_dict, trie_file_dict_cleanup_cb);
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trie_dict_destroy(p_trie_file_dict);
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p_trie_file_dict = NULL;
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}
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int load_file(const char *filename)
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{
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int fd;
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struct stat sb;
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void *p_data;
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size_t data_len;
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int proj_id;
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key_t key;
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size_t size;
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int shmid;
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void *p_shm;
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long line_total;
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long line_offsets[MAX_SPLIT_FILE_LINES];
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long *p_line_offsets;
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int64_t shmid_old;
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if ((fd = open(filename, O_RDONLY)) < 0)
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{
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log_error("open(%s) error (%d)\n", filename, errno);
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return -1;
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}
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if (fstat(fd, &sb) < 0)
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{
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log_error("fstat(fd) error (%d)\n", errno);
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return -1;
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}
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data_len = (size_t)sb.st_size;
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p_data = mmap(NULL, data_len, PROT_READ, MAP_SHARED, fd, 0L);
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if (p_data == MAP_FAILED)
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{
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log_error("mmap() error (%d)\n", errno);
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return -2;
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}
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if (close(fd) < 0)
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{
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log_error("close(fd) error (%d)\n", errno);
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return -1;
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}
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line_total = split_data_lines(p_data, SCREEN_COLS, line_offsets, MAX_SPLIT_FILE_LINES, 1, NULL);
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// Allocate shared memory
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proj_id = (int)(time(NULL) % getpid());
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key = ftok(filename, proj_id);
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if (key == -1)
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{
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log_error("ftok(%s %d) error (%d)\n", filename, proj_id, errno);
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return -2;
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}
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size = sizeof(struct shm_header_t) + data_len + 1 + sizeof(long) * (size_t)(line_total + 1);
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shmid = shmget(key, size, IPC_CREAT | IPC_EXCL | 0600);
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if (shmid == -1)
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{
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log_error("shmget(size = %d) error (%d)\n", size, errno);
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return -3;
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}
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p_shm = shmat(shmid, NULL, 0);
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if (p_shm == (void *)-1)
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{
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log_error("shmat(shmid=%d) error (%d)\n", shmid, errno);
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return -3;
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}
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((struct shm_header_t *)p_shm)->shmid = shmid;
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((struct shm_header_t *)p_shm)->data_len = data_len;
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((struct shm_header_t *)p_shm)->line_total = line_total;
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memcpy((char *)p_shm + sizeof(struct shm_header_t), p_data, data_len);
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if (munmap(p_data, data_len) < 0)
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{
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log_error("munmap() error (%d)\n", errno);
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return -2;
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}
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p_data = (char *)p_shm + sizeof(struct shm_header_t);
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p_line_offsets = (long *)((char *)p_data + data_len + 1);
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memcpy(p_line_offsets, line_offsets, sizeof(long) * (size_t)(line_total + 1));
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if (shmdt(p_shm) == -1)
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{
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log_error("shmdt(shmid=%d) error (%d)\n", shmid, errno);
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return -3;
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}
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if (trie_dict_get(p_trie_file_dict, filename, &shmid_old) == 1)
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{
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if (shmctl((int)shmid_old, IPC_RMID, NULL) == -1)
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{
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log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", (int)shmid_old, errno);
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return -2;
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}
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}
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if (trie_dict_set(p_trie_file_dict, filename, (int64_t)shmid) != 1)
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{
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log_error("trie_dict_set(%s) error\n", filename);
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if (shmid != 0 && shmctl(shmid, IPC_RMID, NULL) == -1)
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{
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log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", shmid, errno);
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}
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return -4;
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}
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return 0;
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}
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int unload_file(const char *filename)
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{
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int64_t shmid;
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if (trie_dict_get(p_trie_file_dict, filename, &shmid) != 1)
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{
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log_error("trie_dict_get(%s) not found\n", filename);
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return -1;
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}
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if (shmctl((int)shmid, IPC_RMID, NULL) == -1)
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{
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log_error("shmctl(shmid=%d, IPC_RMID) error (%d)\n", (int)shmid, errno);
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}
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if (trie_dict_del(p_trie_file_dict, filename) != 1)
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{
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log_error("trie_dict_del(%s) error\n", filename);
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return -2;
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}
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return 0;
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}
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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)
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{
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int64_t shmid;
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const void *p_shm;
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if (p_trie_file_dict == NULL)
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{
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log_error("File loader not initialized\n");
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return NULL;
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}
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if (trie_dict_get(p_trie_file_dict, filename, &shmid) != 1) // Not exist
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{
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log_error("trie_dict_get(%s) not found\n", filename);
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return NULL;
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}
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p_shm = shmat((int)shmid, NULL, SHM_RDONLY);
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if (p_shm == (void *)-1)
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{
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log_error("shmat(shmid=%d) error (%d)\n", (int)shmid, errno);
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return NULL;
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}
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*p_data_len = ((struct shm_header_t *)p_shm)->data_len;
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*p_line_total = ((struct shm_header_t *)p_shm)->line_total;
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*pp_data = (char *)p_shm + sizeof(struct shm_header_t);
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*pp_line_offsets = (const long *)((const char *)(*pp_data) + *p_data_len + 1);
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return p_shm;
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}
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int detach_file_shm(const void *p_shm)
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{
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if (p_shm == NULL)
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{
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return -2;
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}
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if (shmdt(p_shm) == -1)
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{
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log_error("shmdt() error (%d)\n", errno);
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return -1;
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}
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return 0;
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}
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