title: LinuxFB + DirectFB at same time?
body: <p>I have an embedded plarform which has 2 graphic layers (/dev/fb0 and /dev/fb1).</p>
  
  <p>I want to use 2 separate processes:
  One using /dev/fb0 directly (raw mode, no video libs).
  The other using /dev/fb1 through directfb.</p>
  
  <p>I can start the first one and it is working well (i'm using the linux open function to open /dev/fb0 and write to that directly).</p>
  
  <p>When I try to start the second one, it gets stuck in the directfb initialization.</p>
  
  <p>I can't understand why directFb is locking on /dev/fb0 if I'm trying to use the /dev/fb1.</p>
  
  <p>As requested by @shodanex, here is the strace output for the second process:</p>
  
  <pre><code>[pid  1483] open("/etc/directfbrc", O_RDONLY) = 7
  [pid  1483] fstat64(7, {st_mode=S_IFREG|0755, st_size=472, ...}) = 0
  [pid  1483] old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2f375000
  [pid  1483] read(7, "system=fbdev\n#no-vt\n#no-vt-switc"..., 4096) = 472
  [pid  1483] write(2, "(!) DirectFB/Config \'depth\': OK!"..., 39(!) DirectFB/Config 'depth': OK!!!! 32
  ) = 39
  [pid  1483] read(7, "", 4096)           = 0
  [pid  1483] close(7)                    = 0
  [pid  1483] munmap(0x2f375000, 4096)    = 0
  [pid  1483] open("/root/.directfbrc", O_RDONLY) = -1 ENOENT (No such file or directory)
  [pid  1483] write(2, "\n     =======================|  "..., 270
   =======================|  DirectFB 1.0.1  |=======================
        (c) 2001-2007  The DirectFB Organization (directfb.org)
        (c) 2000-2004  Convergence (integrated media) GmbH
      ------------------------------------------------------------
  
  ) = 270
  [pid  1483] gettid()                    = 1483
  [pid  1483] rt_sigaction(SIGHUP, {0x2a323fc0, [], SA_NOMASK|SA_SIGINFO}, {SIG_DFL}, 8) = 0
  [pid  1483] rt_sigaction(SIGINT, {0x2a323fc0, [], SA_NOMASK|SA_SIGINFO}, {SIG_DFL}, 8) = 0
  [pid  1483] rt_sigaction(SIGTERM, {0x2a323fc0, [], SA_NOMASK|SA_SIGINFO}, {SIG_DFL}, 8) = 0
  [pid  1483] rt_sigaction(SIGABRT, {0x2a323fc0, [], SA_NOMASK|SA_SIGINFO}, {SIG_DFL}, 8) = 0
  [pid  1483] rt_sigaction(SIGFPE, {0x2a323fc0, [], SA_NOMASK|SA_SIGINFO}, {0x29d6f860, [], 0}, 8) = 0
  [pid  1483] rt_sigaction(SIGILL, {0x2a323fc0, [], SA_NOMASK|SA_SIGINFO}, {0x29d6f860, [], 0}, 8) = 0
  [pid  1483] rt_sigaction(SIGQUIT, {0x2a323fc0, [], SA_NOMASK|SA_SIGINFO}, {SIG_DFL}, 8) = 0
  [pid  1483] rt_sigaction(SIGSEGV, {0x2a323fc0, [], SA_SIGINFO}, {0x29d6f860, [], 0}, 8) = 0
  [pid  1483] rt_sigaction(SIGTRAP, {0x2a323fc0, [], SA_NOMASK|SA_SIGINFO}, {SIG_DFL}, 8) = 0
  [pid  1483] rt_sigaction(SIGBUS, {0x2a323fc0, [], SA_NOMASK|SA_SIGINFO}, {0x29d6f860, [], 0}, 8) = 0
  [pid  1483] rt_sigaction(SIGXCPU, {0x2a323fc0, [], SA_NOMASK|SA_SIGINFO}, {SIG_DFL}, 8) = 0
  [pid  1483] rt_sigaction(SIGXFSZ, {0x2a323fc0, [], SA_NOMASK|SA_SIGINFO}, {SIG_DFL}, 8) = 0
  [pid  1483] write(2, "(*) DirectFB/Core: Single Applic"..., 64(*) DirectFB/Core: Single Application Core. (2010-03-25 20:40) 
  ) = 64
  [pid  1483] open("/usr/lib/libdirectfb-1.0.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
  [pid  1483] open("/usr/lib/directfb-1.0-0/systems", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 7
  [pid  1483] fstat64(7, {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
  [pid  1483] fcntl64(7, F_SETFD, FD_CLOEXEC) = 0
  [pid  1483] getdents(7, /* 10 entries */, 4096) = 288
  [pid  1483] open("/usr/lib/directfb-1.0-0/systems/libdirectfb_fbdev.so", O_RDONLY) = 8
  [pid  1483] read(8, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0*\0\1\0\0\0\200&amp;\0\0004\0\0\0"..., 512) = 512
  [pid  1483] fstat64(8, {st_mode=S_IFREG|0755, st_size=59543, ...}) = 0
  [pid  1483] old_mmap(NULL, 115640, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 8, 0) = 0x2f378000
  [pid  1483] mprotect(0x2f384000, 65536, PROT_NONE) = 0
  [pid  1483] old_mmap(0x2f394000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 8, 0xc000) = 0x2f394000
  [pid  1483] close(8)                    = 0
  [pid  1483] open("/usr/lib/directfb-1.0-0/systems/libdirectfb_x11.so", O_RDONLY) = 8
  [pid  1483] read(8, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0*\0\1\0\0\0\200\35\0\0004\0\0\0"..., 512) = 512
  [pid  1483] fstat64(8, {st_mode=S_IFREG|0755, st_size=25273, ...}) = 0
  [pid  1483] old_mmap(NULL, 83288, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 8, 0) = 0x2f398000
  [pid  1483] mprotect(0x2f39d000, 61440, PROT_NONE) = 0
  [pid  1483] old_mmap(0x2f3ac000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 8, 0x4000) = 0x2f3ac000
  [pid  1483] close(8)                    = 0
  [pid  1483] open("/usr/local/lib/mylibs/libX11.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
  [pid  1483] open("/usr/local/lib/libX11.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
  [pid  1483] open("/usr/lib/libX11.so.6", O_RDONLY) = 8
  [pid  1483] read(8, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0*\0\1\0\0\0\340\205\1\0004\0\0\0"..., 512) = 512
  [pid  1483] fstat64(8, {st_mode=S_IFREG|0755, st_size=953468, ...}) = 0
  [pid  1483] old_mmap(NULL, 895116, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 8, 0) = 0x2f3b0000
  [pid  1483] mprotect(0x2f477000, 65536, PROT_NONE) = 0
  [pid  1483] old_mmap(0x2f487000, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 8, 0xc7000) = 0x2f487000
  [pid  1483] close(8)                    = 0
  [pid  1483] open("/usr/local/lib/mylibs/libXext.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
  [pid  1483] open("/usr/local/lib/libXext.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
  [pid  1483] open("/usr/lib/libXext.so.6", O_RDONLY) = 8
  [pid  1483] read(8, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0*\0\1\0\0\0\340)\0\0004\0\0\0"..., 512) = 512
  [pid  1483] fstat64(8, {st_mode=S_IFREG|0755, st_size=61440, ...}) = 0
  [pid  1483] old_mmap(NULL, 114084, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 8, 0) = 0x2f48c000
  [pid  1483] mprotect(0x2f498000, 61440, PROT_NONE) = 0
  [pid  1483] old_mmap(0x2f4a7000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 8, 0xb000) = 0x2f4a7000
  [pid  1483] close(8)                    = 0
  [pid  1483] open("/usr/local/lib/mylibs/libxcb-xlib.so.0", O_RDONLY) = -1 ENOENT (No such file or directory)
  [pid  1483] open("/usr/local/lib/libxcb-xlib.so.0", O_RDONLY) = -1 ENOENT (No such file or directory)
  [pid  1483] open("/usr/lib/libxcb-xlib.so.0", O_RDONLY) = 8
  [pid  1483] read(8, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0*\0\1\0\0\0\300\5\0\0004\0\0\0"..., 512) = 512
  [pid  1483] fstat64(8, {st_mode=S_IFREG|0755, st_size=5786, ...}) = 0
  [pid  1483] old_mmap(NULL, 68112, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 8, 0) = 0x2f4a8000
  [pid  1483] mprotect(0x2f4a9000, 61440, PROT_NONE) = 0
  [pid  1483] old_mmap(0x2f4b8000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 8, 0) = 0x2f4b8000
  [pid  1483] close(8)                    = 0
  [pid  1483] open("/usr/local/lib/mylibs/libxcb.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
  [pid  1483] open("/usr/local/lib/libxcb.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
  [pid  1483] open("/usr/lib/libxcb.so.1", O_RDONLY) = 8
  [pid  1483] read(8, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0*\0\1\0\0\0\300u\0\0004\0\0\0"..., 512) = 512
  [pid  1483] fstat64(8, {st_mode=S_IFREG|0755, st_size=112671, ...}) = 0
  [pid  1483] old_mmap(NULL, 144212, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 8, 0) = 0x2f4bc000
  [pid  1483] mprotect(0x2f4cf000, 65536, PROT_NONE) = 0
  [pid  1483] old_mmap(0x2f4df000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 8, 0x13000) = 0x2f4df000
  [pid  1483] close(8)                    = 0
  [pid  1483] open("/usr/lib/libXau.so.6", O_RDONLY) = 8
  [pid  1483] read(8, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0*\0\1\0\0\0\240\n\0\0004\0\0\0"..., 512) = 512
  [pid  1483] fstat64(8, {st_mode=S_IFREG|0755, st_size=10880, ...}) = 0
  [pid  1483] old_mmap(NULL, 71644, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 8, 0) = 0x2f4e0000
  [pid  1483] mprotect(0x2f4e2000, 61440, PROT_NONE) = 0
  [pid  1483] old_mmap(0x2f4f1000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 8, 0x1000) = 0x2f4f1000
  [pid  1483] close(8)                    = 0
  [pid  1483] open("/usr/lib/libXdmcp.so.6", O_RDONLY) = 8
  [pid  1483] read(8, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0*\0\1\0\0\0\0\20\0\0004\0\0\0"..., 512) = 512
  [pid  1483] fstat64(8, {st_mode=S_IFREG|0755, st_size=23841, ...}) = 0
  [pid  1483] old_mmap(NULL, 80376, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 8, 0) = 0x2f4f4000
  [pid  1483] mprotect(0x2f4f8000, 61440, PROT_NONE) = 0
  [pid  1483] old_mmap(0x2f507000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 8, 0x3000) = 0x2f507000
  [pid  1483] close(8)                    = 0
  [pid  1483] getdents(7, /* 0 entries */, 4096) = 0
  [pid  1483] close(7)                    = 0
  [pid  1483] munmap(0x2f398000, 83288)   = 0
  [pid  1483] munmap(0x2f48c000, 114084)  = 0
  [pid  1483] munmap(0x2f3b0000, 895116)  = 0
  [pid  1483] munmap(0x2f4a8000, 68112)   = 0
  [pid  1483] munmap(0x2f4bc000, 144212)  = 0
  [pid  1483] munmap(0x2f4e0000, 71644)   = 0
  [pid  1483] munmap(0x2f4f4000, 80376)   = 0
  [pid  1483] open("/dev/fb1", O_RDWR)    = 7
  [pid  1483] fcntl64(7, F_SETFD, FD_CLOEXEC) = 0
  [pid  1483] setsid()                    = 1483
  [pid  1483] open("/dev/tty0", O_RDONLY|O_NOCTTY) = 8
  [pid  1483] ioctl(8, 0x5603, 0x7bbc1d2a) = 0
  [pid  1483] ioctl(8, 0x5600, 0x497658)  = 0
  [pid  1483] ioctl(7, 0x460f, 0x7bbc1d18) = 0
  [pid  1483] fstat64(7, {st_mode=S_IFCHR|0600, st_rdev=makedev(29, 1), ...}) = 0
  [pid  1483] ioctl(7, 0x4610, 0x7bbc1c28) = 0
  [pid  1483] ioctl(8, 0x5606, 0x2)       = 0
  </code></pre>
  
  <p>Note that the directfb reads the /etc/directfbrc file (check its content ahead).
  Nothing will be printed after that.</p>
  
  <pre><code>system=fbdev
  fbdev=/dev/fb1
  primary-layer=1
  no-cursor
  bg-color=00000000
  disable-module=lirc
  disable-module=keyboard
  disable-module=ps2mouse
  mode=1280x720-60
  pixelformat=ARGB
  depth=32
  hardware
  desktop-buffer-mode=backvideo
  </code></pre>
  
  <p>Have any idea?
  Thaks very much again.</p>