QSTAT(2)            UNIX Programmer's Manual             QSTAT(2)

NAME
     qstat, qfstat - get extended file status

SYNOPSIS
     #include <sys/types.h>
     #include <sys/qstat.h>

     qstat(name, buf)
     char *name;
     struct qstat *buf;

     qfstat(fildes, buf)
     struct qstat *buf;

DESCRIPTION
     _Q_s_t_a_t obtains detailed information about a named file.
     _Q_f_s_t_a_t obtains the same information about an open file known
     by the file descriptor from a successful _o_p_e_n, _c_r_e_a_t, _d_u_p or
     _p_i_p_e(2) call.

     _N_a_m_e points to a null-terminated string naming a file; _b_u_f
     is the address of a buffer into which information is placed
     concerning the file.  It is unnecessary to have any permis-
     sions at all with respect to the file, but all directories
     leading to the file must be searchable.  The layout of the
     structure pointed to by buf as defined in <_q_s_t_a_t._h> is given
     below.

     struct qstat
     {
          char      qs_flag;
          char      qs_count;      /* reference count */
          dev_t     qs_dev;        /* device where inode resides */
          ino_t     qs_number;     /* i number, 1-to-1 with device address */
          u_short   qs_mode;
          short     qs_nlink;      /* directory entries */
          short     qs_uid;        /* owner */
          short     qs_gid;        /* group of owner */
          off_t     qs_size;       /* size of file */
          union {
               struct {
                    daddr_t   qs_addr[NADDR];     /* if normal file/directory */
                    daddr_t   qs_lastr;           /* last logical block read  */
               };
               struct {
                    daddr_t   qs_rdev;            /* qs_addr[0] */
     #ifdef    MPX_FILS
                    struct group qs_group;        /* multiplexer group file */
     #endif
               };
               struct {
                    daddr_t   qs_qused;

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QSTAT(2)            UNIX Programmer's Manual             QSTAT(2)

                    daddr_t   qs_qmax;
               };
          } qs_un;
          time_t    qs_atime; /* access time */
          time_t    qs_mtime; /* modification time */
          time_t    qs_ctime; /* creation time */
     };
     _Q_s__m_o_d_e is encoded according to the `#define' statements in
     <sys/stat.h>.  The mode bits 0000070 and 0000007 encode
     group and others permissions (see _c_h_m_o_d(2)).

     The defined types, _d_a_d_d_r__t, _i_n_o__t, _o_f_f__t, and _t_i_m_e__t name
     various width values; _d_e_v__t encodes major and minor device
     numbers.  Their exact definitions are in the include file
     <sys/types.h> (see _t_y_p_e_s(5)).

     When _f_i_l_d_e_s is associated with a pipe, _q_f_s_t_a_t reports an
     ordinary file with restricted permissions.  The size is the
     number of bytes queued in the pipe.

     _Q_s__a_t_i_m_e is the time the file was last read.  For reasons of
     efficiency, it is not set when a directory is searched,
     although this would be more logical.  _Q_s__m_t_i_m_e is the time
     the file was last written or created.  It is not set by
     changes of owner, group, link count, or mode.  _Q_s__c_t_i_m_e is
     set both both by writing and changing the i-node.

ERRORS
     _Q_s_t_a_t will fail if:

     [EINVAL]            The path name contains a non-ASCII byte.

     [ENOTDIR]           A component of the path prefix is not a
                         directory.

     [EACCES]            A component of the path prefix denies
                         search permission.

     [EFAULT]            _B_u_f or _n_a_m_e points outside the process's
                         allocated address space.

     [ELOOP]             Too many symbolic links were encountered
                         in translating the path name.

     _Q_s_t_a_t_f will fail if:

     [EBADF]             _F_i_l_d_e_s is not a valid open descriptor.

     [EFAULT]            _B_u_f points outside the process's allo-
                         cated address space.

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QSTAT(2)            UNIX Programmer's Manual             QSTAT(2)

SEE ALSO
     file(1), ls(1), pq(1), quota(2), stat(2), filsys(5), set-
     quota(8)

ASSEMBLER
     (local = 58., qfstat = 11.)
     sys local; 9f
     . . .
     .data
     9: sys qfstat; fildes; buf

     (local = 58. qfstat = 12.)
     sys local; 9f
     . . .
     .data
     9: sys qstat; name; buf

Printed 7/30/83                                                 3