pmflush(3) — Linux manual page


PMPRINTF(3)               Library Functions Manual               PMPRINTF(3)

NAME         top

       pmprintf, pmflush - print formatted output in a window or to standard

C SYNOPSIS         top

       #include <pcp/pmapi.h>

       int pmprintf(const char *fmt, ... /*args*/);
       int pmflush(void);

       cc ... -lpcp

DESCRIPTION         top

       The combination of pmprintf and pmflush produces output in either an
       xconfirm(1) window, on the standard error stream, or to a file in a
       manner similar to fprintf(3).  The fmt argument is used to control
       the conversion, formatting, and printing of the variable length args
       list.  The output technique is controlled via an environment

       pmprintf appends the formatted message string to an internal buffer
       shared by the two routines, without actually producing any output.

       pmflush causes the internal buffer to be either displayed in a
       window, printed on standard error, or flushed to a file and the
       internal buffer to be cleared.

ENVIRONMENT         top

       The environment variable PCP_STDERR controls the output technique
       used by pmflush:

           If PCP_STDERR is unset, the text is written onto the stderr
           stream of the caller.

           If PCP_STDERR is set to the literal reserved word DISPLAY then
           the text will be displayed as a GUI dialog using xconfirm(1).

           If PCP_STDERR is set to any other value then pmflush interprets
           the value as a file name and appends the text to that file.  The
           file is created if it doesn't already exist, and in this case if
           the file creation fails, then stderr is used instead).

FILES         top

       pmprintf uses the mkstemp(3) function to create a temporary file.
       This temporary file is deleted when pmflush is called.

DIAGNOSTICS         top

       On successful completion, pmprintf returns the number of characters
       transmitted, while pmflush returns a value of zero on successful

       For either routine, a negative value is returned if an error was
       encountered, and this can be passed to pmErrStr(3) to obtain the
       associated error message.

SEE ALSO         top

       pmdbg(1), fprintf(3), mkstemp(3), pmErrStr(3) and PMAPI(3).

COLOPHON         top

       This page is part of the PCP (Performance Co-Pilot) project.
       Information about the project can be found at ⟨⟩.
       If you have a bug report for this manual page, send it to  This page was obtained from the project's upstream
       Git repository ⟨⟩ on
       2020-08-13.  (At that time, the date of the most recent commit that
       was found in the repository was 2020-08-11.)  If you discover any
       rendering problems in this HTML version of the page, or you believe
       there is a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to

Performance Co-Pilot                 PCP                         PMPRINTF(3)

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