fd leak when fork: forgot to set FD_CLOEXEC for the fd received from accept

[YueHonghui]

Forgot to set FD_CLOEXEC for the accepted fd, which will result in fd leakage when FORK FFMPEG.

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[winlinvip]

Can I submit a patch? git format-patch origin/develop will do, I haven't looked at this ioctl for a long time.

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[YueHonghui]

Submitting a patch won't... Does submitting a PR work?

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[winlinvip]

PR is better than patch, haha.
😄

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