This is the strace result when use select
12:08:30 select(5, [4], NULL, NULL, {1, 684498}) = 1 (in [4], left {1,
648368}) <0.036166>
12:08:30 ioctl(4, VIDIOC_DQBUF, 0x7fffbe72ce50) = 0 <0.000024>
12:08:30 ioctl(4, VIDIOC_QBUF or VT_SETACTIVATE, 0x7fffbe72ce50) = 0 <0.000021>
12:08:30 select(5, [4], NULL, NULL, {2, 0}) = 1 (in [4], left {1,
680471}) <0.319565>
12:08:30 ioctl(4, VIDIOC_DQBUF, 0x7fffbe72ce50) = 0 <0.000023>
12:08:30 ioctl(4, VIDIOC_QBUF or VT_SETACTIVATE, 0x7fffbe72ce50) = 0 <0.000019>
12:08:30 select(5, [4], NULL, NULL, {2, 0}) = 1 (in [4], left {1,
680356}) <0.319680>
12:08:31 ioctl(4, VIDIOC_DQBUF, 0x7fffbe72ce50) = 0 <0.000022>
12:08:31 ioctl(4, VIDIOC_QBUF or VT_SETACTIVATE, 0x7fffbe72ce50) = 0 <0.000019>
12:08:31 select(5, [4], NULL, NULL, {2, 0}) = 1 (in [4], left {1,
648366}) <0.351672>
12:08:31 ioctl(4, VIDIOC_DQBUF, 0x7fffbe72ce50) = 0 <0.000022>
12:08:31 ioctl(4, VIDIOC_QBUF or VT_SETACTIVATE, 0x7fffbe72ce50) = 0 <0.000018>
12:08:31 select(5, [4], NULL, NULL, {2, 0}) = 1 (in [4], left {1,
680368}) <0.319669>
12:08:31 ioctl(4, VIDIOC_DQBUF, 0x7fffbe72ce50) = 0 <0.000022>
12:08:31 ioctl(4, VIDIOC_QBUF or VT_SETACTIVATE, 0x7fffbe72ce50) = 0 <0.000019>
12:08:31 select(5, [4], NULL, NULL, {2, 0}) = 1 (in [4], left {1,
680367}) <0.319669>
12:08:32 ioctl(4, VIDIOC_DQBUF, 0x7fffbe72ce50) = 0 <0.000022>
12:08:32 ioctl(4, VIDIOC_QBUF or VT_SETACTIVATE, 0x7fffbe72ce50) = 0 <0.000019>
12:08:32 select(5, [4], NULL, NULL, {2, 0}) = 1 (in [4], left {1,
648363}) <0.351673>
12:08:32 ioctl(4, VIDIOC_DQBUF, 0x7fffbe72ce50) = 0 <0.000022>
12:08:32 ioctl(4, VIDIOC_QBUF or VT_SETACTIVATE, 0x7fffbe72ce50) = 0 <0.000020>
12:08:32 select(5, [4], NULL, NULL, {2, 0}) = 1 (in [4], left {1,
680359}) <0.319679>
12:08:32 ioctl(4, VIDIOC_DQBUF, 0x7fffbe72ce50) = 0 <0.000023>
12:08:32 ioctl(4, VIDIOC_QBUF or VT_SETACTIVATE, 0x7fffbe72ce50) = 0 <0.000019>
12:08:32 select(5, [4], NULL, NULL, {2, 0}) = 1 (in [4], left {1,
680369}) <0.319667>
12:08:33 ioctl(4, VIDIOC_DQBUF, 0x7fffbe72ce50) = 0 <0.000022>
12:08:33 ioctl(4, VIDIOC_QBUF or VT_SETACTIVATE, 0x7fffbe72ce50) = 0 <0.000019>
This is the strace result when use epoll almost 3 sec delay.
11:57:13 epoll_wait(3, {{EPOLLIN, {u32=1632530473,
u64=140734825918505}}}, 64, 4294967295) = 1 <2.942568>
11:57:16 ioctl(4, VIDIOC_DQBUF, 0x7fff614e6b50) = 0 <0.000021>
11:57:16 ioctl(4, VIDIOC_QBUF or VT_SETACTIVATE, 0x7fff614e6b50) = 0 <0.000017>
11:57:16 ioctl(4, VIDIOC_DQBUF, 0x7fff614e6b50) = 0 <0.000017>
11:57:16 ioctl(4, VIDIOC_QBUF or VT_SETACTIVATE, 0x7fff614e6b50) = 0 <0.000017>
11:57:16 ioctl(4, VIDIOC_DQBUF, 0x7fff614e6b50) = 0 <0.000017>
11:57:16 ioctl(4, VIDIOC_QBUF or VT_SETACTIVATE, 0x7fff614e6b50) = 0 <0.000016>
11:57:16 ioctl(4, VIDIOC_DQBUF, 0x7fff614e6b50) = 0 <0.000016>
11:57:16 ioctl(4, VIDIOC_QBUF or VT_SETACTIVATE, 0x7fff614e6b50) = 0 <0.000016>
11:57:16 ioctl(4, VIDIOC_DQBUF, 0x7fff614e6b50) = 0 <0.000017>
11:57:16 ioctl(4, VIDIOC_QBUF or VT_SETACTIVATE, 0x7fff614e6b50) = 0 <0.000016>
11:57:16 ioctl(4, VIDIOC_DQBUF, 0x7fff614e6b50) = 0 <0.000016>
11:57:16 ioctl(4, VIDIOC_QBUF or VT_SETACTIVATE, 0x7fff614e6b50) = 0 <0.000016>
11:57:16 ioctl(4, VIDIOC_DQBUF, 0x7fff614e6b50) = 0 <0.000016>
11:57:16 ioctl(4, VIDIOC_QBUF or VT_SETACTIVATE, 0x7fff614e6b50) = 0 <0.000016>
11:57:16 ioctl(4, VIDIOC_DQBUF, 0x7fff614e6b50) = 0 <0.000016>
11:57:16 ioctl(4, VIDIOC_QBUF or VT_SETACTIVATE, 0x7fff614e6b50) = 0 <0.000016>
11:57:16 ioctl(4, VIDIOC_DQBUF, 0x7fff614e6b50) = -1 EAGAIN (Resource
temporarily unavailable) <0.000017>
11:57:16 epoll_wait(3, {{EPOLLIN, {u32=1632530473,
u64=140734825918505}}}, 64, 4294967295) = 1 <2.974568>
11:57:19 ioctl(4, VIDIOC_DQBUF, 0x7fff614e6b50) = 0 <0.000020>
11:57:19 ioctl(4, VIDIOC_QBUF or VT_SETACTIVATE, 0x7fff614e6b50) = 0 <0.000017>
11:57:19 ioctl(4, VIDIOC_DQBUF, 0x7fff614e6b50) = 0 <0.000016>
11:57:19 ioctl(4, VIDIOC_QBUF or VT_SETACTIVATE, 0x7fff614e6b50) = 0 <0.000016>
11:57:19 ioctl(4, VIDIOC_DQBUF, 0x7fff614e6b50) = 0 <0.000016>
11:57:19 ioctl(4, VIDIOC_QBUF or VT_SETACTIVATE, 0x7fff614e6b50) = 0 <0.000016>
11:57:19 ioctl(4, VIDIOC_DQBUF, 0x7fff614e6b50) = 0 <0.000017>
11:57:19 ioctl(4, VIDIOC_QBUF or VT_SETACTIVATE, 0x7fff614e6b50) = 0 <0.000017>
11:57:19 ioctl(4, VIDIOC_DQBUF, 0x7fff614e6b50) = 0 <0.000017>
11:57:19 ioctl(4, VIDIOC_QBUF or VT_SETACTIVATE, 0x7fff614e6b50) = 0 <0.000016>
11:57:19 ioctl(4, VIDIOC_DQBUF, 0x7fff614e6b50) = 0 <0.000016>
11:57:19 ioctl(4, VIDIOC_QBUF or VT_SETACTIVATE, 0x7fff614e6b50) = 0 <0.000016>
11:57:19 ioctl(4, VIDIOC_DQBUF, 0x7fff614e6b50) = 0 <0.000016>
11:57:19 ioctl(4, VIDIOC_QBUF or VT_SETACTIVATE, 0x7fff614e6b50) = 0 <0.000016>
11:57:19 ioctl(4, VIDIOC_DQBUF, 0x7fff614e6b50) = 0 <0.000017>
11:57:19 ioctl(4, VIDIOC_QBUF or VT_SETACTIVATE, 0x7fff614e6b50) = 0 <0.000016>
11:57:19 ioctl(4, VIDIOC_DQBUF, 0x7fff614e6b50) = -1 EAGAIN (Resource
temporarily unavailable) <0.000016>
11:57:19 epoll_wait(3, {{EPOLLIN, {u32=1632530473,
u64=140734825918505}}}, 64, 4294967295) = 1 <2.974579>
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