The system_fclose function closes a specified file descriptor. The system_fclose function must be called for every file descriptor opened by any of the system_fopen functions.
int system_fclose(SYS_FILE fd);
0 if the close succeeded, or the constant IO_ERROR if the close failed.
SYS_FILE fd is the platform-independent file descriptor.
SYS_FILE logfd; system_fclose(logfd);
system_errmsg, system_fopenRO, system_fopenRW, system_fopenWA, system_lseek, system_fread, system_fwrite, system_fwrite_atomic, system_flock, system_ulock