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       __pmOpenLog - create a log file for diagnostics and debug output


       #include <pcp/pmapi.h>
       #include <pcp/impl.h>

       FILE  *__pmOpenLog(const  char  *progname,  const  char  *logname, FILE
       *oldstream, int *status)

       cc ... -lpcp


       __pmOpenLog  reassigns  the  standard  I/O  stream  oldstream   to   be
       associated  with  the file logname.  If it already exists, logname will
       be removed and recreated if possible (to ensure correct  ownership  and
       permissions from the caller to __pmOpenLog).

       On  return,  the function value is the new standard I/O stream.  In the
       event of an error, this will be oldstream unchanged and status will  be

       For success, status is 1, a standard preamble is written to logname
            Log for progname on hostname started date and time
       and  an  atexit(3) handler is installed to write the postscript message
       to logname
            Log finished date and time
       when the processes exits.

       progname is only used to annotate messages.


       atexit(3) and freopen(3).