For clarity, rename {CFLAGS, CXXFLAGS, LDFLAGS}-debug to
{CFLAGS, CXXFLAGS, LDFLAGS}-libos-debug.
Also related clean up of LibOS/shim/test/inline/Makefile.
LibOS/shim/test/Makefile has confusion. It's makefile for test/ directory
and common functions for each test directory.
As a first step to untangle the confusion, copy Makefile.Test for
common functions and have test directories to use it.
Later once grapene-tests is updated, LibOS/shim/test/Makefile
will have only submake rules.
Previously, PARALLELMFLAGS variable caused warnings during Glibc build:
"-jN forced in submake: disabling jobserver mode". Since make supports
the jobserver such that passing -jN to parent make automatically allows
its child make to parallelize its jobs, we do not have to pass -j flags
to the child make.
Previously, Graphene supported Glibc version 2.19 only. This commit
adds support for Glibc v2.23 (default in Ubuntu 16.04) and Glibc
v2.27 (default in Ubuntu 18.04). The exact version can be chosen by
specifying GLIBC_VERSION during Graphene build. The default version
to be built is v2.27.
Note that for the best GDB experience it is advised to build Graphene
with the same Glibc version as installed on the host OS.
vDSO is supported by Graphene now, so this commit removes the
modification of Glibc which disabled vDSO in Graphene. Currently,
compile-time option GLIBC_DISABLE_VDSO is introduced to be able
to revert to the old behaviour (disabled by default).
Do not declare the result of the recursive Make call as "phony" to avoid
unnecessary rebuilds. Due to the missing dependency information we of
course still need to always recurse.
Inside `struct shim_handle` `opened` reference counter is used incorrectly.
Additionally at this moment it guards the same resource (handle) as `ref_counter`,
making it obsolete. This patch removes `opened` counter and moves `close_handle`
logic into `put_handle`.
When signal is unmasked and its handler is SIG_IGN, this signal must not
be queued, otherwise such queued but unused signals result in memory leak.
Additionally, SIGCHLD signal can be discarded even if it is unmasked. For
reference, see Linux code (do_notify_parent() @ linux/kernel/signal.c).
Michał Kowalczyk