83 lines
1.7 KiB
C++
83 lines
1.7 KiB
C++
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/* Copyright (C) 1982 by Manx Software Systems */
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/*
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* if MAXCHAN is changed then the initialization of chantab in croot.c
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* should be adjusted so that it initializes EXACTLY MAXCHAN elements of
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* the array. If this is not done, the I/O library may exhibit
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* strange behavior.
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*/
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#define MAXCHAN 11 /* maximum number of I/O channels */
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/*
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* argument to device routines.
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* this is a typedef to allow future redeclaration to guarantee
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* enough space to store either a pointer or an integer.
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*/
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typedef char *_arg;
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/*
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* device control structure
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*/
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struct device {
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char d_read;
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char d_write;
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char d_ioctl; /* used by character special devices (eg CON:) */
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char d_seek; /* used by random I/O devices (eg: a file) */
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int (*d_open)(); /* for special open handling */
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};
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/*
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* device table, contains names and pointers to device entries
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*/
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struct devtabl {
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char *d_name;
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struct device *d_dev;
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_arg d_arg;
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};
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/*
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* channel table: relates fd's to devices
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*/
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struct channel {
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char c_read;
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char c_write;
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char c_ioctl;
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char c_seek;
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int (*c_close)();
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_arg c_arg;
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} ;
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extern struct channel chantab[MAXCHAN];
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struct fcb {
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char f_driv;
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char f_name[8];
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char f_type[3];
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char f_ext;
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char f_resv[2];
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char f_rc;
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char f_sydx[16];
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char f_cr;
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unsigned f_record; char f_overfl;
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};
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struct fcbtab {
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struct fcb fcb;
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char offset;
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char flags;
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char user;
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};
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#define OPNFIL 15
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#define CLSFIL 16
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#define DELFIL 19
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#define READSQ 20
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#define WRITSQ 21
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#define MAKFIL 22
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#define SETDMA 26
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#define GETUSR 32
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#define READRN 33
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#define WRITRN 34
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#define FILSIZ 35
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#define SETREC 36
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#define Wrkbuf ((char *)0x80)
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