1DPNS_READDIRXP(3)           DPNS Library Functions           DPNS_READDIRXP(3)
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NAME

6       dpns_readdirxp - read DPNS directory opened by dpns_opendir in the name
7       server
8

SYNOPSIS

10       #include <sys/types.h>
11       #include "dpns_api.h"
12
13       struct dpns_direnrep *dpns_readdirxp (dpns_DIR  *dirp,  char  *pattern,
14       char *se)
15

DESCRIPTION

17       dpns_readdirxp  reads  the DPNS directory opened by dpns_opendir in the
18       name server.  It does restricted pattern matching  on  basename.   This
19       routine  returns a pointer to a structure containing the current direc‐
20       tory entry (basename, guid and filesize) and the replica information.
21
22       struct dpns_rep_info {
23            u_signed64     fileid;
24            char      status;
25            char      *host;
26            char      *sfn;
27       };
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29       struct dpns_direnrep {
30            u_signed64     fileid;
31            char      guid[CA_MAXGUIDLEN+1];
32            mode_t         filemode;
33            u_signed64     filesize;
34            int       nbreplicas;
35            struct dpns_rep_info *rep;    /* array of replica info structures */
36            unsigned short d_reclen; /* length of this entry */
37            char      d_name[1];     /* basename in variable length */
38       };
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40       dpns_readdirxp caches a variable number of such entries,  depending  on
41       the  filename  size,  to  minimize  the  number of requests to the name
42       server.
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44       dirp   specifies the pointer value returned by dpns_opendir.
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46       pattern
47              allows to restrict the listing to entries  having  the  basename
48              starting with this pattern.
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50       se     allows to restrict the replica entries to a given SE.
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RETURN VALUE

53       This  routine  returns  a pointer to a structure containing the current
54       directory entry if the operation was successful or NULL if the  end  of
55       the  directory  was reached or if the operation failed. When the end of
56       the directory is encountered, serrno is not changed. If  the  operation
57       failed, serrno is set appropriately.
58
59       As  dpns_readdirxp returns a null pointer both at the end of the direc‐
60       tory and on error, an application wishing to check for error situations
61       should set serrno to 0, then call dpns_readdirxp, then check serrno and
62       if it is non-zero, assume an error has occurred.
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ERRORS

65       EBADF        File descriptor in DIR structure is invalid.
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67       ENOMEM       Memory could not be allocated for unmarshalling the reply.
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69       EFAULT       dirp is a NULL pointer.
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71       EINVAL       The length of pattern exceeds CA_MAXNAMELEN or the  length
72                    of se exceeds CA_MAXHOSTNAMELEN.
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74       SENOSHOST    Host unknown.
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76       SENOSSERV    Service unknown.
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78       SECOMERR     Communication error.
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80       ENSNACT      Name server is not running or is being shutdown.
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SEE ALSO

83       dpns_closedir(3), dpns_opendir(3), dpns_rewinddir(3)
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AUTHOR

86       LCG Grid Deployment Team
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90DPNS                     $Date: 2007/12/13 11:59:47 $        DPNS_READDIRXP(3)
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