[Xen-devel] [PATCH 00/11] Return failure on failure for more xl commands

[Paulina Szubarczyk <paulinaszubarczyk@xxxxxxxxx>]

This patch includes the changes from a patch prepared by George Dunlap
[0] and expands them to more xl commands.

This is my bite-sized outreachy project [1][2].

Return failure when the command failed for more xl commands:
- mem-set
- cd-insert
- pci-*
-- freemem
-- tmem-*

This makes xl more useful for scripting.

In the case of mem-set, it means first cleaning up
libxl_set_memory_target() to return useful error codes.

For pci-* functions libxl__create_pci_backend(), libxl__device_pci_destroy_all()
return error codes instead of always 0.

Changes:
- Remove block-attach patch
- Split out removal of spurious getinfolist to a separate patch
- Try to follow CODING_STYLE more closely:
 - In general, don't initialize rc / r, but use set-and-goto
 - Use 'r' for non-libxl error codes
 - Use EXIT_FAILURE and EXIT_SUCCESS rather than magic constants in main_foo()
 - Use 1 and 0 in internal functions of xl

[0] http://lists.xenproject.org/archives/html/xen-devel/2015-12/msg02246.html
[1] http://lists.xenproject.org/archives/html/xen-devel/2016-03/msg03031.html
[2] https://www.mail-archive.com/xen-devel@xxxxxxxxxxxxx/msg62055.html

CC:     Wei Liu <wei.liu2@xxxxxxxxxx>
CC:     Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
CC: Dario Faggioli <dario.faggioli@xxxxxxxxxx>
CC: Ian Campbell <ian.campbell@xxxxxxxxxx>

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