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use global symbols on Unix to support LD_PRELOAD interception #451

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Merged
simonbyrne merged 4 commits into from
Jan 26, 2021
Merged

use global symbols on Unix to support LD_PRELOAD interception #451

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10dcdca
use global symbols on Unix to support LD_PRELOAD interception
simonbyrne Jan 4, 2021
79aaca1
dlopen in deps
simonbyrne Jan 4, 2021
ac3f52f
move dlopen to src
simonbyrne Jan 4, 2021
d2d37bf
Update implementations.jl
simonbyrne Jan 22, 2021
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1 change: 1 addition & 0 deletions deps/build.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -79,6 +79,7 @@ if binary == "system"
const mpiexec_cmd = Cmd(mpiexec isa String ? [mpiexec] : mpiexec)

_doc_external(fname) = ""

include(joinpath("..","src","implementations.jl"))

@info "Using implementation" libmpi mpiexec_cmd MPI_LIBRARY_VERSION_STRING
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12 changes: 12 additions & 0 deletions src/implementations.jl
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@@ -1,7 +1,19 @@
const use_stdcall = startswith(basename(libmpi), "msmpi")

# This is required in addition to __init__() so that we can call library at precompilation time.
if Sys.isunix()
Libdl.dlopen(libmpi, Libdl.RTLD_LAZY | Libdl.RTLD_GLOBAL)
end

macro mpicall(expr)
@assert expr isa Expr && expr.head == :call && expr.args[1] == :ccall

# On unix systems we call the global symbols to allow for LD_PRELOAD interception
# It can be emulated in Windows (via Libdl.dllist), but this is not fast.
if Sys.isunix() && expr.args[2].head == :tuple
expr.args[2] = expr.args[2].args[1]
end

# Microsoft MPI uses stdcall calling convention
# this only affects 32-bit Windows
# unfortunately we need to use ccall to call Get_library_version
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