/* * Copyright (c) 2006-2021, RT-Thread Development Team * * SPDX-License-Identifier: Apache-2.0 * * Change Logs: * Date Author Notes * 2017/11/30 Bernard The first version. */ #include #include #include #include #include #include #include #include "sys/mman.h" void *mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset) { uint8_t *mem; if (addr) { mem = addr; } else mem = (uint8_t *)malloc(length); if (mem) { off_t cur; size_t read_bytes; cur = lseek(fd, 0, SEEK_SET); lseek(fd, offset, SEEK_SET); read_bytes = read(fd, mem, length); if (read_bytes != length) { if (addr == RT_NULL) { /* read failed */ free(mem); mem = RT_NULL; } } lseek(fd, cur, SEEK_SET); return mem; } errno = ENOMEM; return MAP_FAILED; } int munmap(void *addr, size_t length) { if (addr) { free(addr); return 0; } return -1; }