.ref-Research-V6/usr/sys/user.h

/*
 * 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.
 */
struct user
{
        int     u_rsav[2];              /* save r5,r6 when exchanging stacks */
        int     u_fsav[25];             /* save fp registers */
                                        /* rsav and fsav must be first in structure */
        char    u_segflg;               /* flag for IO; user or kernel space */
        char    u_error;                /* return error code */
        char    u_uid;                  /* effective user id */
        char    u_gid;                  /* effective group id */
        char    u_ruid;                 /* real user id */
        char    u_rgid;                 /* real group id */
        int     u_procp;                /* pointer to proc structure */
        char    *u_base;                /* base address for IO */
        char    *u_count;               /* bytes remaining for IO */
        char    *u_offset[2];           /* offset in file for IO */
        int     *u_cdir;                /* pointer to inode of current directory */
        char    u_dbuf[DIRSIZ];         /* current pathname component */
        char    *u_dirp;                /* current pointer to inode */
        struct  {                       /* current directory entry */
                int     u_ino;
                char    u_name[DIRSIZ];
        } u_dent;
        int     *u_pdir;                /* inode of parent directory of dirp */
        int     u_uisa[16];             /* prototype of segmentation addresses */
        int     u_uisd[16];             /* prototype of segmentation descriptors */
        int     u_ofile[NOFILE];        /* pointers to file structures of open files */
        int     u_arg[5];               /* arguments to current system call */
        int     u_tsize;                /* text size (*64) */
        int     u_dsize;                /* data size (*64) */
        int     u_ssize;                /* stack size (*64) */
        int     u_sep;                  /* flag for I and D separation */
        int     u_qsav[2];              /* label variable for quits and interrupts */
        int     u_ssav[2];              /* label variable for swapping */
        int     u_signal[NSIG];         /* disposition of signals */
        int     u_utime;                /* this process user time */
        int     u_stime;                /* this process system time */
        int     u_cutime[2];            /* sum of childs' utimes */
        int     u_cstime[2];            /* sum of childs' stimes */
        int     *u_ar0;                 /* address of users saved R0 */
        int     u_prof[4];              /* profile arguments */
        char    u_intflg;               /* catch intr from sys */
                                        /* kernel stack per user
                                         * extends from u + USIZE*64
                                         * backward not to reach here
                                         */
} u;

/* u_error codes */
#define EFAULT  106
#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 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