84 lines
1.6 KiB
C
84 lines
1.6 KiB
C
/*
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* (C)opyright 1993,1994,1995 by Darren Reed.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that this notice is preserved and due credit is given
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* to the original author and the contributors.
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*/
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/*
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* routines below for saving IP headers to buffer
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*/
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int iplopen(struct inode * inode, struct file * filp)
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{
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u_int min = MINOR(inode->i_rdev);
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if (flags & FWRITE)
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return ENXIO;
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if (min)
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return ENXIO;
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iplbusy++;
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return 0;
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}
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int iplclose(struct inode * inode, struct file * filp)
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{
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u_int min = MINOR(inode->i_rdev);
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if (min)
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return ENXIO;
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iplbusy--;
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return 0;
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}
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/*
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* iplread/ipllog
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* all three of these must operate with at least splnet() lest they be
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* called during packet processing and cause an inconsistancy to appear in
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* the filter lists.
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*/
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int iplread(struct inode *inode, struct file *file, char *buf, int count)
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{
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register int ret, s;
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register size_t sz, sx;
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int error;
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if (!uio->uio_resid)
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return 0;
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while (!iplused) {
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error = SLEEP(iplbuf, "ipl sleep");
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if (error)
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return error;
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}
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SPLNET(s);
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ret = sx = sz = MIN(count, iplused);
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if (iplh < iplt)
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sz = MIN(sz, LOGSIZE - (iplt - iplbuf));
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sx -= sz;
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memcpy_tofs(buf, iplt, sz);
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buf += sz;
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iplt += sz;
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iplused -= sz;
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if ((iplh < iplt) && (iplt == iplbuf + LOGSIZE))
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iplt = iplbuf;
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if (sx) {
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memcpy_tofs(buf, iplt, sx);
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ret += sx;
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iplt += sx;
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iplused -= sx;
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if ((iplh < iplt) && (iplt == iplbuf + LOGSIZE))
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iplt = iplbuf;
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}
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if (!iplused) /* minimise wrapping around the end */
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iplh = iplt = iplbuf;
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SPLX(s);
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return ret;
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}
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