94 lines
2.8 KiB
C
94 lines
2.8 KiB
C
/*
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* The user structure.
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* One allocated per process.
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* Contains all per process data
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* that doesn't need to be referenced
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* while the process is swapped.
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* The user block is USIZE*64 bytes
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* long; resides at virtual kernel
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* loc 140000; contains the system
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* stack per user; is cross referenced
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* with the proc structure for the
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* same process.
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*/
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struct user
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{
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int u_rsav[2]; /* save r5,r6 when exchanging stacks */
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int u_fsav[25]; /* save fp registers */
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/* rsav and fsav must be first in structure */
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char u_segflg; /* flag for IO; user or kernel space */
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char u_error; /* return error code */
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char u_uid; /* effective user id */
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char u_gid; /* effective group id */
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char u_ruid; /* real user id */
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char u_rgid; /* real group id */
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int u_procp; /* pointer to proc structure */
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char *u_base; /* base address for IO */
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char *u_count; /* bytes remaining for IO */
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char *u_offset[2]; /* offset in file for IO */
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int *u_cdir; /* pointer to inode of current directory */
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char u_dbuf[DIRSIZ]; /* current pathname component */
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char *u_dirp; /* current pointer to inode */
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struct { /* current directory entry */
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int u_ino;
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char u_name[DIRSIZ];
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} u_dent;
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int *u_pdir; /* inode of parent directory of dirp */
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int u_uisa[16]; /* prototype of segmentation addresses */
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int u_uisd[16]; /* prototype of segmentation descriptors */
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int u_ofile[NOFILE]; /* pointers to file structures of open files */
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int u_arg[5]; /* arguments to current system call */
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int u_tsize; /* text size (*64) */
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int u_dsize; /* data size (*64) */
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int u_ssize; /* stack size (*64) */
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int u_sep; /* flag for I and D separation */
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int u_qsav[2]; /* label variable for quits and interrupts */
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int u_ssav[2]; /* label variable for swapping */
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int u_signal[NSIG]; /* disposition of signals */
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int u_utime; /* this process user time */
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int u_stime; /* this process system time */
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int u_cutime[2]; /* sum of childs' utimes */
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int u_cstime[2]; /* sum of childs' stimes */
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int *u_ar0; /* address of users saved R0 */
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int u_prof[4]; /* profile arguments */
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char u_intflg; /* catch intr from sys */
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/* kernel stack per user
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* extends from u + USIZE*64
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* backward not to reach here
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*/
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} u;
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/* u_error codes */
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#define EFAULT 106
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#define EPERM 1
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#define ENOENT 2
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#define ESRCH 3
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#define EINTR 4
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#define EIO 5
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#define ENXIO 6
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#define E2BIG 7
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#define ENOEXEC 8
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#define EBADF 9
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#define ECHILD 10
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#define EAGAIN 11
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#define ENOMEM 12
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#define EACCES 13
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#define ENOTBLK 15
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#define EBUSY 16
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#define EEXIST 17
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#define EXDEV 18
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#define ENODEV 19
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#define ENOTDIR 20
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#define EISDIR 21
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#define EINVAL 22
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#define ENFILE 23
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#define EMFILE 24
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#define ENOTTY 25
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#define ETXTBSY 26
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#define EFBIG 27
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#define ENOSPC 28
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#define ESPIPE 29
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#define EROFS 30
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#define EMLINK 31
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#define EPIPE 32
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