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VENTI-LOG(2)                  System Calls Manual                 VENTI-LOG(2)



NAME
       VtLog, VtLogChunk, vtlog, vtlogclose, vtlogdump, vtlognames, vtlogopen,
       vtlogprint, vtlogremove, vtlogopen, ventilogging - Venti logs

SYNOPSIS
       #include <u.h>
       #include <libc.h>
       #include <venti.h>

       VtLog* vtlogopen(char *name, uint size);

       void   vtlogprint(VtLog *log, char *fmt, ...);

       void   vtlogclose(VtLog *log);

       void   vtlog(char *name, char *fmt, ...);

       void   vtlogremove(char *name);

       char** vtlognames(int *n);

       void   vtlogdump(int fd, VtLog *log);

       extern int ventilogging;    /* default 0 */

       extern char *VtServerLog;    /* "libventi/server" */

DESCRIPTION
       These routines provide an in-memory circular log structure used by  the
       Venti  library and the Venti server to record events for debugging pur‐
       poses.  The logs are named by UTF strings.

       Vtlogopen returns a reference to the log with the given name  .   If  a
       log  with that name does not exist and size is non-zero, vtlogopen cre‐
       ates a new log capable of holding at least size bytes and  returns  it.
       Vtlogclose releases the reference returned by vtlogopen.

       Vtlogprint writes to log, which must be open.

       Vtlog is a convenient packaging of vtlogopen followed by vtlogprint and
       vtlogclose.

       Vtlogremove removes the log with the given name, freeing any associated
       storage.

       Vtlognames  returns a list of the names of all the logs.  The length of
       the list is returned in *n.  The list should be freed by calling vtfree
       on the returned pointer.  The strings in the list will be freed by this
       call as well.  (It is an error to call vtfree on any of the strings  in
       the list.)

       Vtlogdump prints log, which must be open, to the file descriptor fd.

       If  ventilogging is set to zero (the default), vtlognames and vtlogdump
       can inspect existing logs, but vtlogopen always returns nil  and  vtlog
       is  a no-op.  The other functions are no-ops when passed nil log struc‐
       tures.

       The server  library  (see  venti-conn(2)  and  venti-server(2))  writes
       debugging  information  to the log named VtServerLog, which defaults to
       the string `libventi/server'.

SOURCE
       /sys/src/libventi

SEE ALSO
       venti(2), venti(8)



                                                                  VENTI-LOG(2)