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问同时使用LinuxFB + DirectFB吗？
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Stack Overflow用户

提问于 2011-02-03 22:17:01

回答 2查看 3.3K关注 0票数 2

我有一个嵌入式plarform，它有两个图形层(/dev/fb0和/dev/fb1)。

我想使用两个独立的进程:一个直接使用/dev/fb0 (raw模式，无视频库)。另一个通过directfb使用/dev/fb1。

我可以启动第一个命令，它工作得很好(我使用linux open函数打开/dev/fb0并直接写入)。

当我尝试启动第二个函数时，它在directfb初始化中卡住了。

如果我尝试使用/dev/fb1，我不明白为什么directFb会锁定/dev/fb0。

根据@shodanex的请求，下面是第二个进程的strace输出：

[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&\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

请注意，directfb读取/etc/directfbrc文件(提前检查其内容)。之后将不会打印任何内容。

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

有什么想法吗？再一次非常感谢你。

embedded

framebuffer

directfb

linux

回答 2

Stack Overflow用户

发布于 2011-02-03 22:59:55

你能提供更多的信息吗：

在第一个进程未启动时是否直接FB工作？
您如何知道directfb锁定在/dev/fb0上?

Linux是一个内核驱动程序，你可以使用任何你想使用/dev/fb<x>的用户空间程序，比如directFB

DirectFB是一个用户空间库，它与Linux帧缓冲一起工作。

所以答案绝对是肯定的，你可以在/dev/fb0上使用你自己的程序，在/dev/fb1上使用DirectFB程序。也许你应该strace你的directfb程序来理解它被卡住的原因。

票数 1

Stack Overflow用户

发布于 2011-02-04 03:34:14

我发现有必要指示应用程序不要切换图形模式。我设法让这两个应用程序一起运行。不再有锁定情况。

现在我正在尝试运行我的实际程序，然而QT却要了我的命，因为它忽略了nographicsmodeswitch参数。我正在努力，我相信它迟早会起作用的。

如果这里有人是QT专家，我将非常感谢您的帮助。

感谢shodanex，你的策略建议非常有用。

票数 0

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/4887224

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