5 int subfd_read(fd,buf,len) int fd; char *buf; int len;
7 if (substdio_flush(subfdout) == -1) return -1;
8 return read(fd,buf,len);
11 char subfd_inbuf[SUBSTDIO_INSIZE];
12 static substdio it = SUBSTDIO_FDBUF(subfd_read,0,subfd_inbuf,SUBSTDIO_INSIZE);
13 substdio *subfdin = ⁢