144 lines
2.3 KiB
C
Executable File
144 lines
2.3 KiB
C
Executable File
/* Copyright (c) 1988 AT&T */
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/* All Rights Reserved */
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/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T */
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/* The copyright notice above does not evidence any */
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/* actual or intended publication of such source code. */
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#ident "@(#)mkdev.c 1.7 92/11/17 SMI" /* SVr4.0 1.3 */
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#include "synonyms.h"
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#include <sys/types.h>
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#include <sys/mkdev.h>
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#include <errno.h>
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/* create a formatted device number */
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dev_t
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__makedev(version, majdev, mindev)
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#ifdef __STDC__
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const register int version;
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const register major_t majdev;
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const register minor_t mindev;
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#else
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register int version;
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register major_t majdev;
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register minor_t mindev;
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#endif
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{
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dev_t devnum;
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switch(version){
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case OLDDEV:
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if (majdev > OMAXMAJ || mindev > OMAXMIN) {
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errno = EINVAL;
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return ((o_dev_t)NODEV);
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}
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devnum = ((majdev << ONBITSMINOR) | mindev);
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break;
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case NEWDEV:
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if (majdev > MAXMAJ || mindev > MAXMIN) {
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errno = EINVAL;
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return (NODEV);
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}
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if ((devnum = ((majdev << NBITSMINOR) | mindev)) == NODEV){
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errno = EINVAL;
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return (NODEV);
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}
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break;
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default:
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errno = EINVAL;
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return (NODEV);
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}
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return(devnum);
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}
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/* return major number part of formatted device number */
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major_t
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__major(version, devnum)
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#ifdef __STDC__
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const register int version;
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const register dev_t devnum;
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#else
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register int version;
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register dev_t devnum;
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#endif
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{
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major_t maj;
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switch(version) {
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case OLDDEV:
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maj = (devnum >> ONBITSMINOR);
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if (devnum == NODEV || maj > OMAXMAJ) {
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errno = EINVAL;
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return (NODEV);
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}
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break;
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case NEWDEV:
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maj = (devnum >> NBITSMINOR);
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if (devnum == NODEV || maj > MAXMAJ) {
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errno = EINVAL;
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return (NODEV);
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}
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break;
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default:
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errno = EINVAL;
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return (NODEV);
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}
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return (maj);
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}
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/* return minor number part of formatted device number */
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minor_t
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__minor(version, devnum)
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#ifdef __STDC__
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const register int version;
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const register dev_t devnum;
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#else
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register int version;
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register dev_t devnum;
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#endif
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{
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switch(version) {
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case OLDDEV:
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if (devnum == NODEV) {
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errno = EINVAL;
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return(NODEV);
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}
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return(devnum & OMAXMIN);
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break;
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case NEWDEV:
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if (devnum == NODEV) {
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errno = EINVAL;
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return(NODEV);
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}
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return(devnum & MAXMIN);
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break;
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default:
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errno = EINVAL;
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return(NODEV);
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}
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}
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