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   pmopenlog    ( 3 )

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Имя (Name)

pmOpenLog - create a log file for diagnostics and debug output

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Синопсис C (C Synopsis)

#include <pcp/pmapi.h>

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

       cc ... -lpcp

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Описание (Description)

pmOpenLog reassigns the standard I/O stream oldstream (normally
       stderr) to be associated with the file logname.  If logname is
       not "-" and already exists, it will be removed and recreated if
       possible (to ensure correct ownership and permissions from the
       caller to pmOpenLog).

       As a special case, if logname is "-" then no removal or reopening
       is performed and the function simply sets status to 1 and returns
       oldstream.  This is useful when the caller wants diagnostics on
       oldstream stream (normally stderr) rather than a file, e.g.
       pmlogger -l- or pmcd -f -l-.  Logging to stderr is also useful
       for PMDAs in a containerized environment where it is beneficial
       for all PMDA logs to be written to pmcd's stderr stream (and thus
       to a single destination), whether that is a file such as pmcd.log
       or the original stream inherited from the shell.

       On return, the function value is the standard I/O stream,
       possibly replacing oldstream.  In the event of an error, the
       return value will be oldstream unchanged and status will be 0.

       For success, status is 1, and 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.

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Смотри также (See also)

atexit(3) and freopen(3).

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