buf_write
void buf_write(struct buf *, int);
buf_write(&recbuf, recfd);
int buf_write(BUF *, const char *, mode_t);
int buf_write(BUF *, const char *, mode_t);
if (buf_write(bp, argv[0], 0644) < 0)
if (buf_write(bp, argv[0], 0644) < 0)