NAME

       __pmOpenLog - create a log file for diagnostics and debug output

C SYNOPSIS

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

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

       cc ... -lpcp

DESCRIPTION

       __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 0.

       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.

SEE ALSO

       atexit(3) and freopen(3).