Method open

libraries/AP_Filesystem/AP_Filesystem.cpp:127–143

}

int AP_Filesystem::open(const char *fname, int flags, bool allow_absolute_paths)
{
    const Backend &backend = backend_by_path(fname);
    int fd = backend.fs.open(fname, flags, allow_absolute_paths);
    if (fd < 0) {
        return -1;
    }
    if (uint32_t(fd) >= MAX_FD_PER_BACKEND) {
        backend.fs.close(fd);
        errno = ERANGE;
        return -1;
    }
    // offset fd so we can recognise the backend
    const uint8_t idx = (&backend - &backends[0]);
    fd += idx * MAX_FD_PER_BACKEND;
    return fd;
}

int AP_Filesystem::close(int fd)
{