Build Error while enable output compress

[flat2010]

Files involved

joy-master/joy_config.h joy-master/src/p2f.c

Platform

Ubuntu 14.04 4.4.0-148

Problem

Step1: modify joy_config.h as follows:

/* Compression is enabled */
#define COMPRESSED_OUTPUT 1
#undef  FORCED_COMPRESSED_OUTPUT_OFF

Step2: modify p2f.c as follows:

// decomment line 1831
zflush(ctx->output);

Step3: then make

$make

Error occurs:

../src/p2f.c: In function 'flow_record_list_print_json':
../src/include/output.h:115:35: error: too few arguments to function 'gzflush'
     #define zflush(FILEp)        (gzflush(FILEp))
                                   ^~~~~~~
../src/p2f.c:1831:5: note: in expansion of macro 'zflush'
     zflush(ctx->output);
     ^~~~~~
In file included from ../src/include/output.h:103,
                 from ../src/include/hdr_dsc.h:47,
                 from ../src/include/p2f.h:59,
                 from ../src/include/pkt_proc.h:47,
                 from ../src/p2f.c:58:
/usr/local/include/zlib.h:1531:21: note: declared here
 ZEXTERN int ZEXPORT gzflush OF((gzFile file, int flush));

This will happen when zflush called if gzip enabled.

Reason

According to Linux specification, gzflush needs 2 parameters which the last should be either:

• Z_SYNC_FLUSH
• Z_FULL_FLUSH
• Z_FINISH

But there's only 1 parameter in definition of zflush:

#ifdef USE_BZIP2
    ···
    #define zflush(FILEp)        (BZ2_bzflush(FILEp))
    ···
#else
    ···
   // gzflush needs 2  parameters
    #define zflush(FILEp)        (gzflush(FILEp))
    ···

Fix

1. Modify definition of gzflush, pass a right macro value as the 2nd parameter;

[flat2010]

Original:

// output.h
#else
    /** gzip compressed output */
    #include <zlib.h>
    typedef gzFile zfile;

    #define zopen(fname, ...)    (gzopen(fname, __VA_ARGS__))

    #ifdef WIN32
        #define zattach(FILEp, ...)  (gzdopen(_fileno(FILEp), __VA_ARGS__))
    #else
        #define zattach(FILEp, ...)  (gzdopen(fileno(FILEp), __VA_ARGS__))
    #endif

    #define zprintf(output, ...) (gzprintf(output, __VA_ARGS__))
    #define zflush(FILEp)        (gzflush(FILEp))
    #define zclose(output)       (gzclose(output))
    #define zsuffix              ".gz"
#endif

My fix:

// output.h
#else
    /** gzip compressed output */
    #include <zlib.h>
    typedef gzFile zfile;

    #define zopen(fname, ...)    (gzopen(fname, __VA_ARGS__))

    #ifdef WIN32
        #define zattach(FILEp, ...)  (gzdopen(_fileno(FILEp), __VA_ARGS__))
        #define zflush(FILEp)        (gzflush(FILEp))
    #else
        #define zattach(FILEp, ...)  (gzdopen(fileno(FILEp), __VA_ARGS__))
        // here we  pass Z_FINISH to gzflush
        #define zflush(FILEp)        (gzflush(FILEp, Z_FINISH))
    #endif

    #define zprintf(output, ...) (gzprintf(output, __VA_ARGS__))
    #define zclose(output)       (gzclose(output))
    #define zsuffix              ".gz"
#endif