I tried to com­pile mpd for Win­dows using Cyg­win. After adding some workarounds (add fake_getaddrinfo.h, check http://musicpd.org/mantis/view.php?id=1566) I was able to com­pile mpd. But when I tried to start it, mpd failed:

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$ ./mpd –no-daemon –std­out –ver­bose
bind­ing to any address
flush­ing warn­ing mes­sages
done flush­ing warn­ing mes­sages
cur­rent locale is “C“
set­ting filesys­tem charset to ISO-8859–1
setF­sCharset: fs charset is: ISO-8859–1
read­ing DB
Bad sys­tem call

Mpd uses shared mem­ory – to use shared mem­ory under Cyg­win you need the cygserver run­ning. A “$ cygserver-config” did the trick and installed a new ser­vice called cygserver. Now export the impor­tant vari­able CYGWIN:

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$ export CYGWIN=server

And retry to start mpd:

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$ ./mpd.exe –std­out –ver­bose
bind­ing to any address
flush­ing warn­ing mes­sages
done flush­ing warn­ing mes­sages
cur­rent locale is “C“
set­ting filesys­tem charset to ISO-8859–1
setF­sCharset: fs charset is: ISO-8859–1
read­ing DB
open­ing pid file  1 [main] mpd 1736 C:cygwinhomempxmpd-testmpd.exe:    *** fatal error — MapViewOf­FileEx (0x19030000),    Win3 2 error 6.  Ter­mi­nat­ing.  68 [main] mpd 676 fork: child 1736 — died    wait­ing for dll load­ing, errno 11 prob­lems fork’ing for daemon!

The same error also occurs when you start mpd with the –no-daemon flag, use mpc and play a file.

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playlist: play 0:“Daft Punk/Daft Punk Alive 2007/7. Too Long.mp3” 
debug play­erInit: 10 
debug play­erInit: 20  
1 [main] mpd 1216 C:cygwinhomempxmpd-testmpd.exe:    
*** fatal error — MapViewOf­FileEx (0x19030000),    
Win32 error 6.  Ter­mi­nat­ing.  2 [main] mpd 2576 fork:
child 1216 — died wait­ing for dll load­ing, errno 11 
debug play­erInit: 30  (pid: 0/-1)
debug play­erInit: 31
player Prob­lems fork()‘ing
playlist: stop

I traced down the error in the file player.c, source:

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sta­tic int play­erInit(void){
  …
  LOG(” debug play­erInit: 10n”);   
  pid = player_pid;   
  if (pid > 0) {
    kill(pid, SIGCONT);       
    pc->wait = 0;       
    return 0;   
  }
  LOG(” debug play­erInit: 20n”);   
  player_pid = fork();     
  «CRASHLOG(” debug play­erInit: 30  (pid: %i/%i)n”, pid, player_pid);       
  blockSig­nals();
  LOG(” debug play­erInit: 31 n”);           
  if (player_pid==0)
  …

I checked my Win­dows event log:
The descrip­tion for Event ID ( 0 ) in Source ( Cyg­win ) can­not be found. The local com­puter may not have the nec­es­sary reg­istry infor­ma­tion or mes­sage DLL files to dis­play mes­sages from a remote com­puter. The fol­low­ing infor­ma­tion is part of the event: cygserver: WARNING: Group not found in /etc/passwd! Using gid –1!.

And cor­rected this error (“$ mkgroup –l > /etc/group” and “$ mkpasswd –l > /etc/passwd”) – but mpd still refused to work. I updated Cyg­win to the lat­est dev snap­shot – still the same error. Looks like a Cyg­win Bug to me.

** Edit (21.11.07): This Cyg­win error has been fixed in the cur­rent Snap­shot release (cygwin1-20071108.dll.bz2), so mpd runns fine under Windows… **

CYGWIN, MPD, shared mem, fork’s and quirk’s

5 Comments

  • 1 Adam wrote:

    I’m con­fused about MPD under Cyg­win. Is ice­cast required to get mp3 func­tion­al­ity? I’ve com­piled and installed lib­mad and libid3tag but when­ever I try to ./configure mpd it says that mp3 and id3 are dis­abled. Your exam­ple here doesn’t seem to include ice­cast. (Not that I can get ice­cast to com­pile, but that’s another can of worms…)

    January 19, 2009 at 01:30 Permalink

  • 2 michu wrote:

    > Is ice­cast required to get mp3 func­tion­al­ity:
    no ice­cast is used to stream your songs..

    try to use “./configure –help” and spec­ify the library path.. did you install lib­mad and libid3tag?

    January 19, 2009 at 12:08 Permalink

  • 3 Adam wrote:

    Hi Michu.

    I’m glad to hear that ice­cast isn’t required, since it doesn’t seem to be com­pi­l­able under Cyg­win (winsock2 issues).

    I have down­loaded and com­piled the sources for lib­mad and libid3tag (libmad-0.15.1b, libid3tag-0.15.1b, and even madplay-0.15.2b). The resul­tant libraries were dropped in /usr/local/lib as part of the process (con­fig­ure / make / make install).

    I tried set­ting LDFLAGS to –L/usr/local/lib as sug­gested by ./configure –help. For what­ever rea­son, the con­fig­u­ra­tion script still refused to find the MAD and ID3TAG libs. There didn’t seem to be any command-line library helpers for mad and id3tag (no –with-mad-includes=DIR, like there are for lame, faad, etc.) so I’m a lit­tle stumped as to how to proceed.

    Adam

    January 20, 2009 at 03:43 Permalink

  • 4 Maarten wrote:

    Hi Michu,

    could you maybe send the exe­cuta­bles you did get as a result?
    I would like to play around a bit with see­ing whether MPD at Win­dows will work like I would like to before I install a full cyg­win installation.

    kind regards,
    Maarten

    April 3, 2009 at 14:31 Permalink

  • 5 Stuben wrote:

    Tried to com­pile both with gcc3 and gcc4.
    Also tried to apply the fake_getaddrinfo patch man­u­ally to listen.c, it didn’t work.
    Here’s the error:
    src/listen.c: In func­tion ‘listen_add_host’:
    src/listen.c:224: error: stor­age size of ‘hints’ isn’t known
    src/listen.c:232: error: ‘AI_PASSIVE’ unde­clared (first use in this func­tion)
    src/listen.c:232: error: (Each unde­clared iden­ti­fier is reported only once
    src/listen.c:232: error: for each func­tion it appears in.)
    src/listen.c:242: warn­ing: implicit dec­la­ra­tion of func­tion ‘getad­drinfo’
    src/listen.c:246: warn­ing: implicit dec­la­ra­tion of func­tion ‘gai_strerror’
    src/listen.c:246: warn­ing: for­mat ‘%s’ expects type ‘char *’, but argu­ment 6 has
    type ‘int’
    src/listen.c:250: error: deref­er­enc­ing pointer to incom­plete type
    src/listen.c:253: error: deref­er­enc­ing pointer to incom­plete type
    src/listen.c:253: error: deref­er­enc­ing pointer to incom­plete type
    src/listen.c:254: error: deref­er­enc­ing pointer to incom­plete type
    src/listen.c:263: error: deref­er­enc­ing pointer to incom­plete type
    src/listen.c:264: error: deref­er­enc­ing pointer to incom­plete type
    src/listen.c:279: warn­ing: implicit dec­la­ra­tion of func­tion ‘freead­drinfo’
    src/listen.c:224: warn­ing: unused vari­able ‘hints’
    src/listen.c: At top level:
    /usr/include/asm/byteorder.h:36: warn­ing: inline func­tion ‘__constant_ntohs’ dec
    lared but never defined
    /usr/include/asm/byteorder.h:35: warn­ing: inline func­tion ‘__constant_ntohl’ dec
    lared but never defined
    make[1]: *** [src_mpd-listen.o] Error 1
    make[1]: Leav­ing direc­tory ‘/home/user/mpd-0.15.4′
    make: *** [all] Error 2

    October 17, 2009 at 18:38 Permalink

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