Add error handling code for some external APIs

[ZhouyangJia]

This patch adds error handling for fopen and socket,
and fixes the issues mentioned in #13607.

Description

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of change

• Bug fix (non-breaking change which fixes an issue)
• Clean up (non-breaking change which removes non-working, unmaintained functionality)
• Improvement (non-breaking change which improves existing functionality)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that will cause existing functionality to change)
• Cosmetic change (non-breaking change that doesn't touch code)
• None of the above (please explain below)

Checklist:

• My code follows the Code Guidelines of this project
• My change requires a change to the documentation, either Doxygen or wiki
• I have updated the documentation accordingly
• I have read the Contributing document
• I have added tests to cover my change
• All new and existing tests passed

[phunkyfish]

@ZhouyangJia you should probably squash your last 2 commits as the reinterpret_cast really belongs in the second commit.

[phunkyfish]

@ZhouyangJia you should only have 2 commits and no merge commits.

[phunkyfish]

Please don't close and reopen a new PR, just fix the commits in this PR. If you need some guidance on how to do this happy to help.

[phunkyfish]

Ok, looking good. @AlwinEsch are you happy with this now?

[ZhouyangJia]

I appreciate your patience and kind reply. As you can see, I'm struggling to figure out how the PR works. Not sure if I do the thing right this time.

Thanks

[phunkyfish]

That's ok, feel free to ask questions if you not sure what to do ;)

[AlwinEsch]

I'm happy 😁

[phunkyfish]

Changes look good.

[phunkyfish]

@ZhouyangJia once Jenkins is happy we can merge this.

[MilhouseVH]

This PR is responsible for the following crash on kodi startup (50/50 chance of hitting it):

Apr 21 16:11:31 nuc systemd[1]: Started Kodi Media Center.
Apr 21 16:11:31 nuc systemd[1]: systemd-update-utmp-runlevel.service: Succeeded.
Apr 21 16:11:31 nuc systemd[1]: Finished Update UTMP about System Runlevel Changes.
Apr 21 16:11:31 nuc kodi.sh[1865]: libva info: VA-API version 1.7.0
Apr 21 16:11:31 nuc kodi.sh[1865]: libva info: User environment variable requested driver 'iHD'
Apr 21 16:11:31 nuc kodi.sh[1865]: libva info: Trying to open /usr/lib/dri/iHD_drv_video.so
Apr 21 16:11:31 nuc kodi.sh[1865]: libva info: Found init function __vaDriverInit_1_7
Apr 21 16:11:31 nuc kodi.sh[1865]: libva info: va_openDriver() returns 0
Apr 21 16:11:33 nuc kodi.sh[1865]: Assertion 'close_nointr(fd) != -EBADF' failed at src/basic/fd-util.c:71, function safe_close(). Aborting.
Apr 21 16:11:33 nuc kodi.sh[1861]: Aborted (core dumped)

Crashlogs:

Ubuntu 19.10/x86_64: http://ix.io/2iYH
LibreELEC x86_64: http://ix.io/2iWY
LibreELEC RPi2: http://ix.io/2iZL

After reverting this PR the crashes stop.