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- /*
- * The user structure.
- * One allocated per process.
- * Contains all per process data
- * that doesn't need to be referenced
- * while the process is swapped.
- * The user block is USIZE*64 bytes
- * long; resides at virtual kernel
- * loc 140000; contains the system
- * stack per user; is cross referenced
- * with the proc structure for the
- * same process.
- */
-
- #define EXCLOSE 01
-
- struct user
- {
- label_t u_rsav; /* save info when exchanging stacks */
- int u_fper; /* FP error register */
- int u_fpsaved; /* FP regs saved for this proc */
- struct {
- int u_fpsr; /* FP status register */
- double u_fpregs[6]; /* FP registers */
- } u_fps;
- char u_segflg; /* IO flag: 0:user D; 1:system; 2:user I */
- char u_error; /* return error code */
- short u_uid; /* effective user id */
- short u_gid; /* effective group id */
- short u_ruid; /* real user id */
- short u_rgid; /* real group id */
- struct proc *u_procp; /* pointer to proc structure */
- int *u_ap; /* pointer to arglist */
- union { /* syscall return values */
- struct {
- int r_val1;
- int r_val2;
- };
- off_t r_off;
- time_t r_time;
- } u_r;
- caddr_t u_base; /* base address for IO */
- unsigned int u_count; /* bytes remaining for IO */
- off_t u_offset; /* offset in file for IO */
- struct inode *u_cdir; /* pointer to inode of current directory */
- struct inode *u_rdir; /* root directory of current process */
- char u_dbuf[DIRSIZ]; /* current pathname component */
- caddr_t u_dirp; /* pathname pointer */
- struct direct u_dent; /* current directory entry */
- struct inode *u_pdir; /* inode of parent directory of dirp */
- int u_uisa[16]; /* prototype of segmentation addresses */
- int u_uisd[16]; /* prototype of segmentation descriptors */
- struct file *u_ofile[NOFILE]; /* pointers to file structures of open files */
- char u_pofile[NOFILE]; /* per-process flags of open files */
- int u_arg[5]; /* arguments to current system call */
- unsigned u_tsize; /* text size (clicks) */
- unsigned u_dsize; /* data size (clicks) */
- unsigned u_ssize; /* stack size (clicks) */
- label_t u_qsav; /* label variable for quits and interrupts */
- label_t u_ssav; /* label variable for swapping */
- int u_signal[NSIG]; /* disposition of signals */
- time_t u_utime; /* this process user time */
- time_t u_stime; /* this process system time */
- time_t u_cutime; /* sum of childs' utimes */
- time_t u_cstime; /* sum of childs' stimes */
- int *u_ar0; /* address of users saved R0 */
- struct { /* profile arguments */
- short *pr_base; /* buffer base */
- unsigned pr_size; /* buffer size */
- unsigned pr_off; /* pc offset */
- unsigned pr_scale; /* pc scaling */
- } u_prof;
- char u_intflg; /* catch intr from sys */
- char u_sep; /* flag for I and D separation */
- struct tty *u_ttyp; /* controlling tty pointer */
- dev_t u_ttyd; /* controlling tty dev */
- struct { /* header of executable file */
- int ux_mag; /* magic number */
- unsigned ux_tsize; /* text size */
- unsigned ux_dsize; /* data size */
- unsigned ux_bsize; /* bss size */
- unsigned ux_ssize; /* symbol table size */
- unsigned ux_entloc; /* entry location */
- unsigned ux_unused;
- unsigned ux_relflg;
- } u_exdata;
- char u_comm[DIRSIZ];
- time_t u_start;
- char u_acflag;
- short u_fpflag; /* unused now, will be later */
- short u_cmask; /* mask for file creation */
- int u_stack[1];
- /* kernel stack per user
- * extends from u + USIZE*64
- * backward not to reach here
- */
- };
-
- extern struct user u;
-
- /* u_error codes */
- #define EPERM 1
- #define ENOENT 2
- #define ESRCH 3
- #define EINTR 4
- #define EIO 5
- #define ENXIO 6
- #define E2BIG 7
- #define ENOEXEC 8
- #define EBADF 9
- #define ECHILD 10
- #define EAGAIN 11
- #define ENOMEM 12
- #define EACCES 13
- #define EFAULT 14
- #define ENOTBLK 15
- #define EBUSY 16
- #define EEXIST 17
- #define EXDEV 18
- #define ENODEV 19
- #define ENOTDIR 20
- #define EISDIR 21
- #define EINVAL 22
- #define ENFILE 23
- #define EMFILE 24
- #define ENOTTY 25
- #define ETXTBSY 26
- #define EFBIG 27
- #define ENOSPC 28
- #define ESPIPE 29
- #define EROFS 30
- #define EMLINK 31
- #define EPIPE 32
- #define EDOM 33
- #define ERANGE 34
-